CN101448992A - Absorbent body, multilayer absorbent body, and absorbent article - Google Patents

Abstract

The invention provides an absorbent body which has water-absorbing fibers and is mainly used for adjusting fiber orientation and adjusting fiber unit area weight or shape. The absorbent body (110) contains water-absorbing fibers, and has a plurality of low fiber unit area weight regions formed continuously in a first direction and having a fiber unit area weight lower than the average fiber unit area weight of the absorbent body (110), and a plurality of high fiber unit area weight regions formed on both sides of the low fiber unit area weight regions when viewed in a second direction orthogonal to the first direction and having a fiber unit area weight higher than the average fiber unit area weight formed along the low fiber unit area weight regions, the fibers (101) constituting the high fiber unit area weight regions of the plurality of high fiber unit area weight regions having a longitudinally oriented fiber content higher than a transversely oriented fiber content, and the fibers (101) constituting the low fiber unit area weight regions of the plurality of low fiber unit area weight regions having a transversely oriented fiber content higher than a longitudinally oriented fiber content.

Description

Absorbent body, multilayer absorbent body and absorbent article

technical field

The present invention relates to an absorbent body containing water-absorbent fibers and an absorbent article having the absorbent body.

Background technique

At present, absorbers containing water-absorbing fibers such as cellulose fibers are widely used in the fields of sanitary products such as disposable diapers and sanitary napkins, cleaning products, and medical products. As described above, although the absorber is used in various fields, when it is actually used in products in each field, it needs to be manufactured to have properties and structures suitable for the use of each product.

In addition, in recent years, multi-layered absorbers and the like in which nonwoven fabrics are laminated on absorbers have sometimes been processed into shapes suitable for respective product uses of the absorbers, and desired functions may be exhibited.

For example, in (Japanese) Unexamined Patent Publication No. 2005-73921, it is proposed that a vertically elongated diaper has grooves formed on the absorber by embossing in order to diffuse excreted urine in the front-back direction. department.

In addition, for example, in (Japanese) Patent No. 3556581, it is proposed that an absorber made of pulp or a superabsorbent resin is formed by penetrating needle-shaped protrusions or conical protrusions to form through-holes or non-through holes. Absorbent with concave holes.

However, in the embossed absorber proposed in JP-A-2005-73921, the grooves formed by embossing may become dense and rigidity may be improved. When a diaper having such an absorber is worn on the body, it may not conform to the shape of the body and gaps may occur, which increases the risk of leakage of excrement and causes the user to feel a foreign body sensation.

In addition, the absorbent body proposed in (Japanese) Patent No. 3556581 is only provided with openings formed by performing secondary processing such as needle-like protrusions on the uniformly laminated absorbent body, and the fibers in the area other than the openings Almost all in the same direction. Like this, if the fiber of the region other than the perforated part all faces the same direction in any region, then in the region other than the perforated part, the menstrual blood that moves from the top sheet avoids the perforated part while following the hydrophilic fibers. The direction of fiber orientation penetrates almost concentrically. As described above, if the absorber has a lengthwise shape conforming to the shape of the body, menstrual blood tends to flow to both sides of the absorber, causing a problem of side leakage.

Contents of the invention

The present invention provides an absorbent body having water-absorbent fibers, mainly an absorbent body in which the orientation of the fibers is adjusted, and the basis weight or shape of the fibers is adjusted.

(1) An absorbent body comprising absorbent fibers,

having multiple low fiber basis weight regions and multiple high fiber basis weight regions,

A low fiber basis weight region is continuously formed along the first direction, having a fiber basis weight lower than the average fiber basis weight of the absorbent body;

The high fiber basis weight region is formed on both sides of the above-mentioned low fiber basis weight region in the second direction perpendicular to the above-mentioned first direction, and is formed along the low fiber basis weight region, while the fiber basis weight is higher than The above average fiber basis weight,

In the plurality of high fiber basis weight regions, the content of longitudinally oriented fibers in the fibers constituting the high fiber basis weight region is higher than the content of transversely oriented fibers,

In the plurality of low fiber basis weight regions, the content of the transversely oriented fibers in the fibers constituting the low fiber basis weight regions is higher than the content of the longitudinally oriented fibers.

(2) The absorber according to (1), wherein all or part of the plurality of high fiber basis weight regions protrude in the thickness direction of the absorber, and the thickness ratio of the absorber as the length in the thickness direction is greater than that of the absorber. The average thickness of the thick convex portion,

All or part of the plurality of low-fiber basis weight regions are recessed in the thickness direction and are grooves having a thin thickness.

(3) The absorbent body according to (1) or (2), wherein a fiber-less region having at least one of a plurality of depressions and a plurality of openings is formed in the low fiber basis weight region.

(4) In the absorbent body as described in (3), the thickness of the lateral regions provided on both sides of the above-mentioned recessed part or the above-mentioned opening as the lateral regions of the above-mentioned high fiber basis weight region is smaller than that of the above-mentioned The above-mentioned thickness is thinner in the regions other than the above-mentioned side regions in the high fiber basis weight region.

(5) The absorber according to any one of (1) to (4), further comprising a polymer absorber.

(6) The absorber according to (5), wherein the polymer absorber is provided offset on a surface opposite to a surface on which the low fiber basis weight region and the high fiber basis weight region are formed.

(7) The absorber according to (5) or (6), wherein the polymer absorber is provided in the low fiber basis weight region.

(8) An absorbent body in which the first absorbent body described in any one of (1) to (7) and the absorbent body described in any one of (5) to (7) are laminated. In the second absorbent body, the surfaces forming the low fiber basis weight region and the high fiber basis weight region face each other.

(9) A multilayer absorbent body comprising a first fibrous layer and an absorbent body laminated on one side of the first fibrous layer and having water-absorbent fibers,

A plurality of grooves and a plurality of protrusions are formed, and the plurality of grooves are formed along the first direction in a concave shape in the thickness direction of the multilayer absorbent body when viewed from the other side of the first fiber layer; The convex portion protrudes in the thickness direction and is formed adjacent to the plurality of grooves when viewed from a second direction perpendicular to the first direction, and has a fiber basis weight higher than a region constituting the bottom of the grooves. ,

Viewed in the thickness direction, the regions constituting the bottoms of the plurality of grooves and the plurality of convex portions are respectively laminated with the first fiber layer and the absorber,

The shape of the absorber constituting the plurality of convex portions is such that the surface of the absorber on the side of the first fiber layer protrudes toward the same side as the side on which the other surface of the first fiber layer protrudes.

(10) The multilayer absorbent body according to (9), wherein the fibers constituting the convex portions of the plurality of convex portions have a higher content of longitudinally oriented fibers than transversely oriented fibers,

In the plurality of grooves, the content of the transversely oriented fibers is higher than the content of the longitudinally oriented fibers of the fibers constituting the plurality of grooves.

(11) In the multilayer absorbent body described in (9) or (10), a plurality of depressed portions and / or multiple openings,

All or a part of the side walls constituting the recesses of the plurality of grooves and/or the plurality of openings and/or the periphery of the plurality of openings constitute the first fiber layer. fiber coverage.

(12) The multilayer absorbent body according to any one of (9) to (11), further comprising a second fiber layer provided on a surface of the absorbent body opposite to the first fiber layer.

(13) The multilayer absorbent body according to (12), wherein the first fiber layer and the second fiber layer are laminated by carding,

The absorbent body is formed by laminating a fiber layer constituting the absorbent body on one surface of the first fiber layer by an air-laying method.

(14) An absorbent article comprising a first fiber layer, an absorbent body having water-absorbent fibers laminated on one side of the first fiber layer, and an absorbent body layered on the side opposite to the first fiber layer of the absorbent body. liquid impermeable sheet,

A plurality of grooves and a plurality of convex portions are formed, and the grooves are formed along the first direction in a concave shape in the thickness direction of the multilayer absorbent body viewed from the other side of the first fiber layer; The shape protruding in the thickness direction is formed adjacent to the plurality of grooves when viewed from a second direction perpendicular to the first direction, and has a fiber basis weight higher than a region constituting the bottom of the grooves,

The plurality of grooves and the plurality of protrusions are formed by the first fiber layer and the absorber,

The shape of the absorber constituting the plurality of convex portions is such that the face of the absorber on the side of the first fiber layer protrudes from the same side as the side on which the other side of the first fibrous layer protrudes.

(15) The absorbent article according to (14), wherein the fibers constituting the convex portions of the plurality of convex portions have a higher content of longitudinally oriented fibers than horizontally oriented fibers,

In the plurality of grooves, the content of the transversely oriented fibers is higher than the content of the longitudinally oriented fibers of the fibers constituting the plurality of grooves.

(16) The absorbent article according to (14) or (15), wherein a plurality of recesses and/or a plurality of openings are formed at predetermined intervals in the plurality of grooves,

All or a part of the side walls constituting the periphery of the plurality of recesses and/or the plurality of openings are covered with the fibers constituting the first fiber layer.

(17) The absorbent article according to any one of (14) to (16), further comprising a second fiber layer provided between the absorbent core and the liquid-impermeable sheet.

(18) A method of manufacturing an absorbent body, comprising: a supporting step, a moving step, and a spraying step,

In the supporting step, a fiber aggregate for an absorbent body including a sheet-shaped water-absorbent fiber aggregate and a state in which the fibers constituting the fiber aggregate have a degree of freedom is placed on a predetermined surface of an air-permeable support member, or placed A fiber layer containing water-absorbent fibers is provided on the predetermined surface, and is supported on the air-permeable support member from one side of the fiber assembly for absorbent body;

In the moving step, the fiber assembly for an absorbent body supported by the air-permeable supporting member is moved in a first direction by a predetermined moving mechanism;

In the spraying step, a fluid mainly composed of gas is sprayed from the other surface side of the fiber assembly for an absorbent body moved in the first direction in the moving step by a predetermined spraying mechanism.

(19) A method of manufacturing a multilayer absorbent body, comprising: a supporting step, a moving step, and a spraying step,

In the supporting step, a multi-layered fiber aggregate having a first fiber aggregate and a fiber aggregate for an absorbent body is placed on a predetermined surface of the air-permeable support member, the first fiber aggregate is a fiber aggregate formed into a sheet, and is The fibers constituting the fiber aggregate have a degree of freedom; the fiber aggregate for the absorbent body is a sheet-like fiber aggregate containing water-absorbent fibers that is stacked on one side of the first fiber aggregate and constitutes the fiber aggregate. The fibers of the fiber aggregate have a degree of freedom, or the fibers containing water-absorbent fibers are laminated on the above-mentioned predetermined surface to form the fiber aggregate for absorbent body, and simultaneously the above-mentioned first fiber layer is laminated to form the above-mentioned multiple a layered fiber assembly supported on the air-permeable support member from one side of the multi-layered fiber assembly;

In the moving step, the multilayered fiber assembly supported by the air-permeable supporting member is moved in a first direction by a predetermined moving mechanism;

In the spraying step, a fluid mainly composed of gas is sprayed from the other side of the multilayered fiber assembly moved in the first direction in the moving step by a predetermined spraying mechanism.

(20) A method of manufacturing a multilayer absorbent body, comprising: a supporting step, a moving step, and a spraying step,

The supporting step is to place a multi-layered fiber assembly having a first fiber assembly, an absorbent body fiber assembly, and a second fiber assembly on a predetermined surface of an air-permeable supporting member, the first fiber assembly being formed into a sheet shape The fiber aggregate is in a state where the fibers constituting the fiber aggregate have a degree of freedom, and the fiber aggregate for an absorbent body is a sheet-like fiber containing water-absorbent fibers that are stacked on one side of the first fiber aggregate. The aggregate is a state in which the fibers constituting the fiber aggregate have a degree of freedom, and the second fiber aggregate is provided on the opposite side of the first fiber layer of the above-mentioned fiber aggregate for absorbent body to form a substantially sheet-shaped fiber aggregate, The fibers constituting the fiber aggregate have a degree of freedom, and are supported on the air-permeable supporting member from one side of the multilayer fiber aggregate;

In the moving step, the multilayered fiber assembly supported by the air-permeable supporting member is moved in a first direction by a predetermined moving mechanism;

In the spraying step, a fluid mainly composed of gas is sprayed from the other side of the multilayered fiber assembly moved in the first direction in the moving step by a predetermined spraying mechanism.

(21) The method for producing a multilayer absorbent body according to (20), wherein the supporting step includes the following steps:

disposing the second fiber assembly on the predetermined surface of the air-permeable supporting member,

The fiber aggregate for absorbent body is formed by laminating fibers containing the water-absorbent fibers constituting the fiber aggregate for absorbent body on the surface of the second fiber aggregate opposite to the air-permeable supporting member side,

The above-mentioned first fiber assembly is laminated on the side opposite to the side of the above-mentioned second fiber assembly on the above-mentioned formed above-mentioned fiber assembly for an absorbent body to form the above-mentioned multilayer fiber assembly.

(22) The method for producing a multilayer absorbent body according to (21), wherein the fiber aggregate for the absorbent body is formed by an air-laid method.

The present invention can provide an absorbent body having water-absorbent fibers, mainly an absorbent body in which the orientation of the fibers is adjusted and the basis weight or shape of the fibers is adjusted.

Description of drawings

Fig. 1 is a perspective view of a fiber web.

Fig. 2 is a perspective cross-sectional view of the absorber according to the first embodiment.

Fig. 3A is a plan view of the absorber of the first embodiment.

Fig. 3B is a bottom view of the absorber of the first embodiment.

Fig. 4A is a plan view of a mesh support member.

Fig. 4B is a perspective view of a mesh support member.

5 is a view showing a state in which the absorbent body of the first embodiment shown in FIG. 2 is produced by injecting gas toward the upper side of the fiber web of FIG. 1 while the lower side is supported by the mesh support member of FIG. 4A and FIG. 4B .

Fig. 6 is a side view illustrating an absorbent body manufacturing apparatus.

Fig. 7 is a plan view illustrating an absorbent body manufacturing apparatus.

FIG. 8 is an enlarged perspective view of a region Z in FIG. 6 .

Fig. 9 is a bottom view of the ejection unit in Fig. 6 .

Fig. 10 is a perspective cross-sectional view of an absorber according to a second embodiment.

Fig. 11 is a plan view of an absorber according to a second embodiment.

Fig. 12A is an A-A' sectional view of Fig. 11 .

Fig. 12B is a cross-sectional view along line B-B' of Fig. 11 .

Fig. 13A is a plan view of an absorber according to a second embodiment.

Fig. 13B is a bottom view of the absorber of the second embodiment.

Fig. 14A is a plan view of a support member in which elongated members are arranged side by side on a mesh support member at equal intervals.

Fig. 14B is a perspective view of a support member in which elongated members are arranged side by side on a mesh support member at equal intervals.

Fig. 15 is a diagram showing a state in which the fiber web of Fig. 1 is supported by the support member of Fig. 14A and Fig. 14B to spray gas toward the upper side to manufacture the absorber of the second embodiment shown in Fig. 10 .

Fig. 16 is a perspective cross-sectional view of a multilayer absorbent core according to a third embodiment.

Fig. 17 is a perspective cross-sectional view of a multilayer absorbent core according to a fourth embodiment.

Fig. 18 is an explanatory view showing the structure of the vicinity of openings of a multilayer absorbent body according to a fourth embodiment.

Fig. 19 is a perspective cross-sectional view of a multilayer absorbent core according to a fifth embodiment.

Fig. 20 is a perspective cross-sectional view of an absorber according to a sixth embodiment.

Fig. 21 is a perspective cross-sectional view of an absorber according to a seventh embodiment.

Fig. 22 is a perspective sectional view of an absorber according to an eighth embodiment.

Fig. 23 is a perspective cross-sectional view of the absorbent article of the present invention.

Fig. 24A is a plan view of a plate-shaped support member having a plurality of elliptical openings.

Fig. 24B is a perspective view of a plate-shaped support member having a plurality of elliptical openings.

Detailed ways

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a perspective view of a fiber web. Fig. 2 is a perspective cross-sectional view of the absorber according to the first embodiment. Fig. 3A is a plan view of the absorber of the first embodiment. Fig. 3B is a bottom view of the absorber of the first embodiment. Fig. 4A is a plan view of a mesh support member. Fig. 4B is a perspective view of a mesh support member. Fig. 5 is a view showing a state in which the fiber web of Fig. 1 is supported on the lower side by the mesh support member in Figs. 4A and 4B , and gas is sprayed toward the upper side to manufacture the absorbent body of the first embodiment shown in Fig. 2 . Fig. 6 is a side view illustrating an absorbent body manufacturing apparatus. Fig. 7 is a plan view illustrating an absorbent body manufacturing apparatus. FIG. 8 is an enlarged perspective view of a region Z in FIG. 6 . Fig. 9 is a bottom view of the ejection unit in Fig. 6 . Fig. 10 is a perspective cross-sectional view of an absorber according to a second embodiment. Fig. 11 is a plan view of an absorber according to a second embodiment. Fig. 12A is an A-A' sectional view of Fig. 11 . Fig. 12B is a cross-sectional view along line B-B' of Fig. 11 . Fig. 13A is a plan view of an absorber according to a second embodiment. Fig. 13B is a bottom view of the absorber of the second embodiment. Fig. 14A is a plan view of a support member in which elongated members are arranged side by side on a mesh support member at equal intervals. Fig. 14B is a perspective view of a support member in which elongated members are arranged side by side on a mesh support member at equal intervals. Fig. 15 is a view showing a state in which the fiber web of Fig. 1 is supported on the lower side by the supporting member shown in Figs. 14A and 14B , and gas is sprayed toward the upper side to manufacture the absorbent body according to the second embodiment shown in Fig. 10 . Fig. 16 is a perspective cross-sectional view of a multilayer absorbent core according to a third embodiment. Fig. 17 is a perspective cross-sectional view of a multilayer absorbent core according to a fourth embodiment. Fig. 18 is an explanatory view showing the structure of the vicinity of openings of a multilayer absorbent body according to a fourth embodiment. Fig. 19 is a perspective cross-sectional view of a multilayer absorbent core according to a fifth embodiment. Fig. 20 is a perspective cross-sectional view of an absorber according to a sixth embodiment. Fig. 21 is a perspective cross-sectional view of an absorber according to a seventh embodiment. Fig. 22 is a perspective sectional view of an absorber according to an eighth embodiment. Fig. 23 is a perspective cross-sectional view of the absorbent article of the present invention. Fig. 24A is a plan view of a plate-shaped support member having a plurality of elliptical openings. Fig. 24B is a perspective view of a plate-shaped support member having a plurality of elliptical openings.

1. Absorber

Embodiments of the absorber of the present invention will be described based on FIGS. 1 to 22 .

1-1. First Embodiment

The absorber of 1st Embodiment is demonstrated based on FIGS. 1-9.

1-1-1. Absorber

As shown in Fig. 2, Fig. 3(A) and Fig. 3(B), the absorbent body 110 of this embodiment is an absorbent body containing water-absorbent fibers, and a plurality of grooves 1 are arranged along the mechanical flow direction (MD, first direction) are formed on one surface side of the absorber 110, and are formed side by side at approximately equal intervals when viewed from the direction (CD, second direction) perpendicular to the mechanical flow direction. Further, a plurality of convex portions 2 are respectively formed between the plurality of groove portions 1 formed at substantially equal intervals. Like the grooves 1 , the convex portions 2 are formed side by side at approximately equal intervals when viewed from CD. Here, in this embodiment, although the grooves 1 are formed side by side at substantially equal intervals, the present invention is not limited thereto, and may be formed at different intervals, and the grooves 1 are not arranged in parallel but between the grooves 1 when viewed from the MD. intervals are formed variably.

Moreover, although the height (thickness direction) of the convex-shaped part 2 of the absorber 110 of this embodiment is substantially the same, you may make it differ from the height of the adjacent convex-shaped part 2. For example, the height of the protruding portion 2 can be adjusted by adjusting the interval between the ejection ports 913 ejecting a fluid mainly composed of gas in the manufacturing apparatus 90 described later. For example, the height of the convex portion 2 can be reduced by narrowing the distance between the discharge ports 913 , and the height of the convex portion 2 can be increased by widening the distance between the discharge ports 913 . Furthermore, the convex portions 2 having different heights may be alternately formed by alternately forming the intervals of the ejection ports 913 at narrow intervals and wide intervals. In this way, when the multilayer non-woven fabrics that alternately form the convex portions 2 of different heights are placed in contact with the body, compared with the case of equal heights, the contact area with the skin is reduced, so it can reduce the impact on the skin. The advantage of burden.

In this embodiment, the convex portion 2 is a high fiber basis weight region, and the region constituting the bottom of the groove portion 1 is a low fiber basis weight region. That is, the absorbent body 110 of the present embodiment has a plurality of low fiber basis weight regions formed continuously along the machine flow direction (MD) with a fiber basis weight lower than the average fiber basis weight on the absorbent body, and a plurality of A high fiber basis weight region having a fiber basis weight higher than the average fiber basis weight is formed along the low fiber basis weight region on both sides of the low fiber basis weight region as viewed from the MD. A plurality of high fiber basis weight regions Among the fibers constituting the high fiber basis weight region, fibers oriented in the range from -45 degrees to +45 degrees relative to MD have a higher content of longitudinally oriented fibers than non-lengthwise oriented fibers The content of transversely oriented fibers. In addition, in the plurality of low fiber basis weight regions, the content of transversely oriented fibers is higher than the content of longitudinally oriented fibers among the fibers constituting the low fiber basis weight regions.

Fiber orientation was measured using a digital microscope VHX-100 manufactured by KEYENCE Corporation, using the following measurement method. (1) Fix the sample on the observation table so that the length direction (LD) is the longitudinal direction, (2) remove the fibers that protrude irregularly to the front, and focus the lens on the fiber closest to the front, (3) Set the imaging depth (depth), and create a 3D image of the sample on the PC screen. Then (4) convert the 3D image into a 2D image, (5) draw a plurality of parallel lines on the screen that divide the lengthwise direction equally in time in the measurement range. (6) On each unit where parallel lines are drawn and divided in detail, observe whether the fiber orientation is in the length direction or the width direction, and measure the number of fibers oriented in each direction. Then, (7) Measurement and calculation can be performed by calculating the ratio of the number of fibers whose fibers are oriented in the length direction and the ratio of the number of fibers whose fibers are oriented in the width direction relative to the number of all fibers within the set range.

Here, when the absorbent body 110 of the present embodiment is used in absorbent articles such as sanitary napkins, for example, the fibers 101 constituting the convex portion 2 as a high fiber basis weight region are continuously formed convexly. The direction (MD, longitudinal direction, first direction) of the shape portion 2 is oriented, therefore, liquids such as menstrual blood moving from the top sheet are transferred along the elongation direction of the shape portion 2. And, the area adjacent to the convex portion 2 which is a high fiber basis weight area and which constitutes the bottom of the groove portion 1 as a low fiber basis weight area has a small number of constituent fibers per unit area, and the capillary force is reduced. Therefore, liquid such as menstrual blood does not easily permeate in the width direction (CD) which is a direction intersecting with the extending direction of the convex portion 2 .

Moreover, since the groove part 1 which is a low fiber basis weight area|region is formed in the absorber 110, it becomes easy to bend using the groove part 1 as a bending starting point. Therefore, the absorbent article is easily deformed according to the shape of the body, and fits the body more easily. And, even if the region constituting the bottom of the groove portion 1 has a low fiber basis weight, since the fibers constituting the bottom of the groove portion 1 are oriented in the width direction on the groove portion 1, the width direction ( The strength in the width direction (CD) of the groove portion 1 is high. In this way, it is possible to suppress wrinkles and damages caused by changes in motion when the absorbent article is worn on the body.

And, the absorber is in contact with the top sheet provided on the skin side of the absorber 110 and the convex portion 2 mainly in the high fiber basis weight region. In other words, since the top sheet does not substantially contact the bottom of the groove portion 1 which is a low fiber basis weight region, menstrual blood can be suppressed from flowing back from the absorber due to external pressure or the like (moisture return).

1-1-2. Manufacturing method

The manufacturing method of the absorber 110 is demonstrated based on FIG.1, FIG.6 - FIG.9. First, the water-absorbent fiber-containing fiber web 100 shown in FIG. 1 is placed on the upper surface side of the mesh support member 210 shown in FIG. 4 as an air-permeable support member. In other words, the fiber web 100 is supported from the lower side by the mesh support member 210 . The method of placing the fiber web 110 on the mesh support member 210 is other than placing the sheet-shaped fiber web 100 on the upper side of the mesh support member 210, for example, by air-laying fibers containing water-absorbent fibers. A method of laminating on the mesh support member 210 .

Then, the absorbent body 110 of the present embodiment can be manufactured by moving the mesh support member 210 in the state of supporting the fiber web 100 in the machine flow direction (MD), and continuously injecting gas from the upper surface side of the moving fiber web 100. .

As shown in FIG. 4 , the mesh support member 210 is formed by weaving a plurality of metal wires 211 of a predetermined thickness as an air-impermeable portion. By weaving a plurality of wires 211 at predetermined intervals, it is possible to obtain a mesh support member 210 in which a plurality of hole portions 213 serving as air-permeable portions are formed.

As described above, the mesh support member 210 forms a plurality of small-diameter hole portions 213, and the gas injected from the upper side of the fiber web and the gas passing through the fiber web are not hindered by the mesh support member 210 downward ( Set the opposite side of the fiber mesh side) breathable. The mesh support member 210 does not greatly change the flow of the injected gas, and also prevents the fibers 101 from moving downward of the mesh support member 210 .

Therefore, the fibers 101 on the fiber web 100 move in a predetermined direction mainly by the gas injected from the upper side. Specifically, the fibers 101 move in a direction along the surface of the mesh support member 210 because the movement of the fibers to the lower side of the mesh support member 210 is restricted.

For example, the fibers 101 in the region where the gas is sprayed move to the region adjacent to the region. Then, when the fiber web 100 moves in the machine flow direction (MD) in the state where the gas is sprayed, the region where the fibers 101 move is formed along the machine flow direction. In other words, the fibers 101 move to the side of the area where the gas is sprayed.

In this way, the fibers 101 oriented mainly in the machine flow direction (MD) move sideways to form the grooves 1 . Further, the fibers 101 oriented in the direction (CD) perpendicular to the mechanical flow direction (MD) remain at the bottom of the groove portion 1 . Further, the convex portion 2 is formed on the side of the groove portion 1 , in other words, between the groove portion 1 and the adjacent groove portion 1 . The ratio of fibers 101 oriented in the longitudinal direction among the fibers 101 and 102 is increased while the fiber density of the lateral portion of the convex portion 2 formed by moving the fibers 101 oriented in the MD direction from the region where the groove portion 1 is formed improve.

Here, the fiber web 100 may consist only of water-absorbent fibers, or may be formed by mixing water-absorbent fibers and heat-melt fibers. Specifically, fibers formed by mixing 80-100% by mass of pulp and 20-0% by mass of polyethylene and polypropylene with a core-sheath structure can be used to adjust the fiber basis weight to 10 to 1000 g/m ² . The average fiber length of the fibers constituting the fiber web 100 is 1 to 20 mm, preferably 2 to 10 mm.

The water-absorbent fibers refer to fibers having water-absorbing properties and fibers provided with water-absorbing properties. In addition, the absorbent fibers may be, for example, cellulose fibers. In addition, as the fiber provided with water absorption, for example, a synthetic fiber or a shrinkage fiber subjected to a hydrophilic treatment. The specific content will be described later.

And, since a plurality of grooves 1 and a plurality of protrusions 2 are formed by spraying a fluid mainly composed of a gas to a predetermined surface of the fiber web 100 formed of fibers with short fiber lengths, The opposite side of the web 100 on 210 is suctioned (suctioned). For example, suction (suction) may be started immediately before spraying a fluid mainly composed of gas onto a predetermined surface of the fiber web 100 .

In this way, by sucking (inhaling) from the opposite side of the mesh support member 210, the fiber web 100 and the mesh support member 210 can be brought into close contact, and fiber scattering caused by jetting a fluid mainly composed of gas can be suppressed. In this way, the shapes of the plurality of groove portions 1 and the plurality of convex portions 2 are appropriately formed on the predetermined surface of the fiber web 100 .

1-1-3. Absorbent body manufacturing equipment

The absorbent body manufacturing apparatus 90 which manufactures the absorbent body 110 is demonstrated based on FIGS. 6-9.

The absorbent body manufacturing apparatus 90 has an air-permeable support member that supports the fiber web 100 as a fiber aggregate from one side, and constitutes the fiber web 100 that is supported from the other side of the fiber web 100 by the air-permeable support member from the above-mentioned one side. The ejection unit 910 of the jetting mechanism for jetting a fluid mainly composed of gas, the air delivery unit (not shown), and the conveyor 930 as a moving mechanism for moving the fiber web 100 in a predetermined direction F which is a machine flow direction.

And, the conveyor 930 as the above-mentioned moving mechanism moves the fiber web 100 in a state supported by the air-permeable supporting member from the above-mentioned one surface side to a predetermined direction F, and the discharge unit 910 and the air supply unit (not shown) as the spraying mechanism move toward the predetermined direction F. A fluid mainly composed of gas is sprayed on the other side of the fiber web 100 moved in the predetermined direction F by the conveyor 930 .

In this way, the fibers 101 constituting the fiber web 100 pass through the fluid mainly composed of gas (jetted) ejected from the ejection part 910, and/or as the (jetted) mainly gaseous fluid ejected from the ejection part 910 The formed fluid, mainly composed of gas, permeates through the fiber web 100 and its flow direction is changed by an impermeable portion formed on an air-permeable support member described later, and moves the fibers 101 constituting the fiber web 100 . By adjusting the amount of movement of the fibers 101, the fiber orientation, fiber density, or fiber basis weight on the fiber web 100 can be adjusted, and predetermined grooves 1 (and convex portions 2) or openings 3 described later can be formed.

Here, the movement of the fibers 101 constituting the fiber web 100 can be adjusted by changing the injection conditions of the fluid mainly composed of gas. That is, in addition to the shape and arrangement of the air-permeable portion on the air-permeable support member and the air-permeable portion of the absorbent body, by adjusting the injection conditions of the fluid mainly composed of gas, the fiber orientation, fiber density, or fiber basis weight of the absorbent body 110 can be adjusted. , the predetermined shape of the groove portion 1 (and the convex portion 2 ), or the opening portion 3 described later, and the like.

1-2. Second Embodiment

An absorber according to a second embodiment will be described with reference to FIGS. 11 to 15 . The absorbent body 120 of the second embodiment is an absorbent body in which a plurality of openings 3 are formed at predetermined intervals at the bottom of the groove portion 1 in the low fiber basis weight region of the absorbent body 110 of the first embodiment. In this embodiment, the grooves 1 are formed side by side at substantially equal intervals when viewed from CD, but the present invention is not limited thereto. The mutual interval of 1 is formed in a variable manner. In addition, the heights of the convex portions 2 may be different, and may be formed at different heights from each other. In addition, in the present embodiment, although a plurality of openings 3 are formed, a plurality of recesses (not shown) may be formed instead of the openings 3 .

1-2-1. Absorber

As shown in FIG. 11, the groove part 1 of the absorber 120 of this embodiment is wide in the area|region where the opening part 3 is formed, and is narrow in the area|region where the opening part 3 is not formed. Conversely, when viewed from CD, the convex portion 2 is narrow in the area where the opening 3 is formed, and wide in the area where the opening 3 is not formed when viewed from CD.

In addition, the height (length in the thickness direction) of the convex portion 2 varies in the extending direction of the convex portion 2 . That is, as shown in FIG. 11, FIG. 12(A) and FIG. 12(B), the height Ha of the convex portion 2 adjacent to the region where the opening 3 is formed when viewed from CD is higher than that of the area where the opening 3 is not formed when viewed from CD. The height Hb of the convex portion 2 adjacent to each other is low. Not only the opening 3, but also the case of forming a depression is included, as viewed from CD, the depressions (not shown) provided on the convex portion 2 as the high fiber basis weight region or both sides of the opening 3 The thickness of the side region of the fiber is thinner than the thickness of the region of the side region of the convex portion 2 which is not a high fiber basis weight region.

Seen from the direction (MD) in which the convex portion 2 continues to extend, the top of the convex portion 2 forms gentle undulations in the thickness direction. It can be said that the convex portion 2 is alternately and continuously formed with the first convex portion 2L having a low height in the thickness direction and the second convex portion 2H having a high thickness in the thickness direction in the direction in which the convex portion 2 extends.

The fibers 101 provided on the periphery of the opening 3 are oriented along the periphery of the opening 3 . In other words, the end portion of the opening 3 viewed from the longitudinal direction (MD) of the groove portion 1 is oriented in a direction (CD) intersecting the longitudinal direction. And, the side portion of the opening 3 viewed from the longitudinal direction (MD) of the groove portion 1 is oriented along the direction of the longitudinal direction (MD).

A connecting portion 4 formed to connect the convex portion 2 and the adjacent convex portion 2 is formed between the opening portion 3 and the adjacent opening portion 3 . In other words, the plurality of connection portions 4 formed at predetermined intervals connect the convex portion 2 and the adjacent convex portion 2 .

As described above, the fiber basis weight of the fibers 101 of the convex portion 2 is adjusted to be higher than the region constituting the bottom of the groove portion 1 . In addition, the fiber basis weight in the region constituting the bottom portion of the groove portion 1 is adjusted to be lower than the average fiber basis weight of the entirety including the groove portion 1 and the convex portion 2 .

Here, when the absorbent body 120 of this embodiment is used in absorbent articles such as sanitary napkins, since the absorbent body 120 has openings formed in the region constituting the bottom of the groove portion 1 which is a low fiber basis weight region, Therefore, even if high-viscosity menstrual blood is excreted near the opening 3, it can fall into the opening 3, and the high-viscosity menstrual blood and the like can be prevented from covering the entire surface of the absorbent body. By doing so, for example, deterioration of the absorbency of the absorbent article can be suppressed.

In addition, since the height of the convex portion 2 in the thickness direction has a high portion and a low portion in the direction (MD, longitudinal direction) in which the convex portion 2 is continuously formed, the convex portion 2 has a lower height even in the direction in which the convex portion 2 is continuously formed. Easy to bend. In this way, for example, in a state where the absorbent article is worn on the body, it is further deformed along the body and deformed to fit the body.

1-2-2. Manufacturing method

Hereinafter, the manufacturing method of the absorber 120 of this embodiment is demonstrated. First, the fiber web 100 containing water-absorbent fibers is placed on the upper surface side of the support member 220 shown in FIG. 14 as the air-permeable support member. In other words, the fiber web 100 is supported from the lower side by the support member 220 .

Then, the absorber 120 of this embodiment can be manufactured by moving the supporting member 220 in a state supporting the fiber web 100 in a predetermined direction, and continuously injecting gas from the upper surface side of the moving fiber web 100 .

The supporting member 220 is installed on the conveyor so that the elongated member 225 is arranged along the direction (CD) perpendicular to the machine flow direction (MD). The supporting member 220 on which the fiber web 100 is placed on the upper side moves in the machine flow direction. In this way, the gas is continuously injected toward the upper surface side of the fiber web 100 in a direction substantially perpendicular to the direction in which the elongated member 225 extends. That is, the groove portion 1 is formed along the mechanical flow direction (MD), in other words, along a direction substantially perpendicular to the elongated direction of the elongated member 225 . In addition, in the region where the groove portion 1 is formed, the opening portion 3 described later is formed in a region provided on the upper surface of the elongated member 225 .

As described above, the support member 220 is a support member in which a plurality of elongated members 225 are arranged approximately in parallel at predetermined intervals on the upper surface of the mesh support member 210 . The elongated member 225 is an air-impermeable member, and prevents the gas injected from the upper side (one side) from ventilating to the lower side (the other side). In other words, the flow direction of the gas sprayed onto the elongated member 225 is changed.

Furthermore, the elongated member 225 prevents the fibers 101 constituting the fiber web 100 from moving from the upper side (one side) to the lower side (the other side) of the supporting member 220 .

Therefore, the fibers 101 constituting the fiber web 100 are moved by the gas injected from the upper side of the fiber web 100 and/or the gas passing through the fiber web 100 whose flow direction is changed by the elongated member 225 .

The fibers 101 located in the region where the gas was sprayed move to the region adjacent to the region. Specifically, the fibers 101 oriented in the machine flow direction (MD, longitudinal direction) move in a direction (CD, width direction) perpendicular to the machine flow direction.

In this way, the groove portion 1 is formed. And, the remaining fibers 101 without moving are oriented in the width direction (CD), and constitute the bottom of the groove portion 1 . That is, the fibers 101 constituting the bottom of the groove portion 1 are oriented in the width direction (CD). Moreover, the convex part 2 is formed between the groove part 1 and the groove part 1 adjacent to it. The fiber density of the side portion of the convex portion 2 is increased by the moved fibers 101 , and the ratio of the fibers 101 disposed in the longitudinal direction (MD) among the fibers 101 constituting the side portion is increased.

Furthermore, the gas that passes through the fiber web 100 as the injected gas and whose flow direction is changed by the elongated member 225 also moves the fibers 101 constituting the fiber web 100 in a direction different from the above.

Since the mesh support member 210 and the elongated member 225 constituting the support member 220 limit the movement of the fiber 101 to the side opposite to the side where the fiber web 100 is placed on the support member 220, that is, the lower side, the fiber 101 is placed along the support member 220. The surface of the fiber web 100, that is, the upper direction moves.

Specifically, the gas injected into the elongated member 225 changes its flow to flow along the surface of the elongated member 225 . The gas whose flow is changed in this way causes the fibers 101 disposed on the upper surface of the elongated member 225 to move from the upper surface of the elongated member 225 to its surrounding area. In this way, one or two or more of the orientation, density, or fiber basis weight of the fibers 101 are adjusted while forming the openings 3 of a predetermined shape.

Moreover, by adjusting the temperature, amount or strength of the fluid mainly formed of gas sprayed onto the fiber web 100, in addition, adjusting the moving speed of the fiber web 100 on the moving mechanism, adjusting the tension, etc., even using the plate shown in FIG. 24 The absorber 120 of this embodiment can also be obtained by using the support member 230 in the shape.

Here, the absorber 120 of this embodiment can be manufactured using the manufacturing apparatus 90 mentioned above. The operation of the manufacturing apparatus 90 in this case is as described above.

1-3. Third Embodiment

A multilayer absorbent body 140 according to a third embodiment will be described with reference to FIG. 16 . The multilayer absorbent body 140 of the third embodiment is a multilayer absorbent body including a first fiber layer 141 and an absorbent body 142 laminated on one side of the first fiber layer 141 . On the other surface of the first fiber layer 141, a plurality of grooves 1A recessed in the thickness direction of the multilayer absorbent body 140 are formed, and a plurality of grooves 1A protruding in the thickness direction are respectively adjacent to the plurality of grooves 1A when viewed from CD. A plurality of convex portions 2A having a higher fiber basis weight than the bottom portion of the groove portion 1A. The plurality of groove portions 1A and the plurality of convex portions 2A are composed of the first fiber layer 141 and the absorber 142 as viewed in the thickness direction. In addition, the shape of the absorber 142 constituting the convex portion 2A is such that the surface of the absorber 142 on the first fiber layer 141 side protrudes from the same side as the other surface of the first fiber layer 141 . In addition, the shape of the absorber 142 constituting the groove portion 1A is such that the surface of the absorber 142 on the first fiber layer 141 side is dented on the same side as the other surface of the first fiber layer 141 .

Here, in the multilayer absorbent body 140, although the grooves 1A are formed side by side at substantially equal intervals, the present invention is not limited to this, and may be formed at different intervals, and the grooves 1A are not arranged in parallel but between the grooves 1A. The intervals are formed variably. In addition, the heights of the convex portions 2 may be different, and different heights may be formed.

In addition, among the fibers constituting the convex portion 2A of each of the plurality of convex portions 2A, the content rate of the longitudinally oriented fibers is higher than the content rate of the laterally oriented fibers. In addition, the content of the transversely oriented fibers in the fibers constituting the region of the bottom of the groove 1A in each of the plurality of grooves 1A is higher than the content of the longitudinally oriented fibers.

1-3-1. Shape

As shown in FIG. 16 , the multilayer absorbent body 140 of this embodiment is formed by laminating the first fiber layer 141 and the absorbent body 142 as described above. The multilayer absorbent body 140 is an absorbent body in which a plurality of grooves 1A are formed side by side at approximately equal intervals from CD on one side of the multilayer absorbent body 140 , specifically, on the first fiber layer 141 side. Further, a plurality of convex portions 2A are formed between the plurality of groove portions 1A formed at approximately equal intervals when viewed from CD. The convex portions 2A are formed side by side at substantially equal intervals, similarly to the groove portion 1A. In the present embodiment, although the grooves 1A are formed side by side at approximately equal intervals, it is not limited to this. As described above, for example, they may be formed at different intervals, and the grooves may not be arranged in parallel but viewed from the MD. The intervals between the portions 1A are formed so as to vary.

The plurality of groove portions 1A and the plurality of convex portions 2A are formed by the first fiber layer 141 and the absorber 142 . Here, the absorbent body 142 on the multilayered absorbent body 140 is not simply a sheet having a uniform thickness, but has a deformed shape according to the shape of the plurality of grooves 1A formed in the first fiber layer 141 .

In the convex portion 2A, the surface of the first fiber layer 141 on the side opposite to the side where the absorber 142 is provided constitutes the surface of the convex portion 2A. The outer side (upper side in the drawing) in the thickness direction of the multilayer absorbent body 140 protrudes in a U-shape. Moreover, the surface of the absorber 142 side of the 1st fiber layer 141 is the shape which protrudes in U shape to the same side as the surface which comprises 2 A of convex-shaped parts.

The surface of the absorbent body 142 opposite to the first fiber layer 141 side, that is, the surface (bottom surface) constituting the other surface of the multilayer absorbent body 142 is formed in a planar shape. The surface of the absorber 142 on the side of the first fiber layer 141 is deformed convexly along the surface of the first fiber layer 141 on the side of the absorber 142 . That is, the first fiber layer 141 side of the absorber 142 protrudes on the same side as the surface on the front side of the first fiber layer 141 protrudes in a U-shape.

Furthermore, the thickness of the first fiber layer 141 in the region constituting the bottom of the groove portion 1A is thinner than the thickness of the absorber 142 in the convex portion 2A. Furthermore, the thickness of the first fiber layer 141 constituting the bottom of the groove portion 1A is thinner than the thickness of the absorber 142 on the convex portion 2A.

The surface on the front side of the first fiber layer 141 of the groove portion 1A has a concave shape that becomes thinner in the thickness direction. Furthermore, the surface of the absorber 142 on the first fiber layer 141 side has a concave shape on the same side as the surface on the front side of the first fiber layer 141 .

Moreover, although the height (thickness direction) of the convex-shaped part 2A of the multilayer absorber 140 is substantially the same, you may form it, for example so that mutually adjacent convex-shaped part 2A may differ in height. For example, the height of the convex portion 2A can be adjusted by adjusting the interval between the ejection ports 913 ejecting fluid mainly composed of gas. For example, the height of the convex portion 2A can be reduced by narrowing the distance between the discharge ports 913 of the absorbent body manufacturing apparatus 90 , and conversely, the height of the convex portion 2A can be increased by widening the distance between the discharge ports 913 . Furthermore, the convex-shaped portions 2A having different heights may be alternately formed by alternately forming the intervals of the ejection ports 913 at narrow intervals and wide intervals. In this way, when the multilayer non-woven fabrics with different heights are formed in contact with the body, the contact area with the skin is reduced compared with the case of equal heights, so it is possible to reduce the damage to the skin. The advantages of burden.

Here, the height of the convex portion 2A is 0.3 to 15 mm, preferably 0.5 to 5 mm. Also, the width of the convex portion 2A is 0.5 to 30 mm, preferably 1.0 to 10 mm. The distance between the vertices of adjacent convex portions 2A is 0.5 to 30 mm, preferably 3 to 10 mm.

The height (length in the thickness direction) of the absorber 142 of the convex portion 2A is 95% or less of the height of the convex portion 2A, preferably 20 to 90%, more preferably 40 to 70%. Here, in the absorber 142, the height (length in the thickness direction) of the convex portion 2A is made higher than the height of the portion of the groove portion 1A.

Furthermore, the height of the region constituting the bottom of the groove portion 1A is 90% or less of the height of the convex portion 2A, preferably 1 to 50%, more preferably 5 to 20%. The width of the groove portion 1A is 0.1 to 30 mm, preferably 0.5 to 10 mm. The distance between adjacent groove portions 1A is 0.5 to 20 mm, preferably 3 to 10 mm. The height of the absorber (inner layer) 142 of the groove portion 1A is 95% or less of the height (length in the thickness direction) of the groove portion 1A, preferably 20 to 90%, more preferably 40 to 70%.

Here, the method of measuring the height, pitch, and width of the convex portion 2A or the groove portion 1A is as follows. For example, the multilayer absorbent body 140 is placed on a workbench in a non-pressurized state, the cross section of the multilayer absorbent body 140 is photographed with a microscope, and the cross-sectional photograph or cross-sectional image is used for measurement. The multilayer absorbent body 140 to be measured is cut along CD so as to pass through the apex of the convex portion 2A and the groove portion 1A.

In addition, when measuring the height (length in the thickness direction), the highest position of the bottom of the convex portion 2A and the bottom of the groove portion 1A upward from the lowest position of the multilayer absorbent body 140 (that is, the table surface) is taken as the height. Take measurements.

In addition, when measuring the pitch, the pitch of the convex portions 2 is measured between the peaks of the adjacent convex portions 2A, which are the highest positions, and between the centers of the adjacent groove portions 1A, which are the center positions.

When measuring the width, measure the maximum width of the bottom surface of the convex portion 2A upward from the lowermost position (that is, the table surface) of the multilayer absorbent body 140, and measure the groove portion 1 in the same manner as the groove portion 1A. The maximum width of the base of 1A.

Here, the cross-sectional shape of the convex portion 2A may be, for example, a dome shape, a trapezoid shape, a triangle shape, an omega shape, or a square shape, and the shape is not particularly limited. For example, when used as a top sheet of an absorbent article, it is preferable that the top surface and the side surface of the convex portion 2A be curved (curved surface) in order to provide a good feeling against the user's skin. In addition, in order to prevent the convex portion 2A from being deformed by the pressure during use, or the space formed by the groove portion 1, etc., it is preferable that the groove portion 1A has a shape that narrows in width from the bottom surface toward the top surface. An ideal cross-sectional shape is, for example, a dome shape.

In addition, the cross-sectional shape of the absorber (inner layer) 142 of the convex portion 2A can be a predetermined shape as described above, and is not particularly limited, but it is preferably round so that the user does not easily feel the rigidity of the absorber 142. Curves (curved surfaces) such as top shapes.

Furthermore, by constituting the absorber 142 with a hard fiber layer (hard-to-deform fibers), the convex-shaped portion 2A can be made less likely to deform in the thickness direction.

For example, the fiber 102 constituting the first fiber layer 141 can be formed in a state where the degree of freedom of formation is higher than the average degree of freedom of the fibers 101, 102 constituting the multilayer absorbent body 140, and the degree of freedom of formation is lower than the average degree of freedom of the fibers 101 constituting the absorbent body 142. state of freedom. For example, the degree of freedom of the fibers 101 constituting the absorber 142 may be adjusted to be lower than the degree of freedom of the fibers 101 constituting the first fiber layer 141 . Here, the average degree of freedom of the fibers is, for example, an average value of the degrees of freedom of the fibers 102 constituting the first fiber layer 141 and the fibers 101 constituting the absorbent body 142 .

In order to make the fibers 102 constituting the first fiber layer 141 into a state with a high degree of freedom, for example, the intensity of intersection points between the fibers 101 may be partially different. Specifically, the first fiber layer 141 may be adjusted such that all or a part of joint strengths at intersections between fibers constituting the first fiber layer 141 are reduced or not joined.

In order to adjust the first fiber layer 141 so that all or part of the joint strength of the intersection points between the fibers constituting the first fiber layer 141 is reduced or not joined, for example, various fibers having different melting points of the resin components on the surface of the fiber 102 may be mixed. For example, fiber A with a core-sheath structure of low-density polyethylene (melting point 110°C) and polyethylene terephthalate and a core of high-density polyethylene (melting point 135°C) and polyethylene terephthalate The fiber B of the sheath structure is mixed at a ratio of fiber A:fiber B=70:30 to form the fiber web 100 . In addition, when the fiber aggregate is heat-treated at a temperature of 120° C. in an oven or the like, the fibers are less likely to melt through the intersection between the fibers A on the fiber aggregate and the intersection between the fiber A and the fiber B. Density polyethylene for thermal fusion. Here, since the amount of low-density polyethylene melted at the intersection is large, the fusion strength at the intersection between fibers A is stronger than the fusion strength at the intersection between fibers A and B. Furthermore, at the intersection points between the fibers B, since the high-density polyethylene does not melt, thermal fusion does not occur. That is, it becomes a state where thermal fusion or the like is performed in the relationship of intersection strength between fibers A>intersection strength between fibers A and fiber B>intersection strength between fibers B. In this case, for example, when the absorbent body 142 is made of fibers having a melting point of 120° C. or lower, the fiber intersection strength of the absorbent body 142 can be made higher than that of the fibers on the first fiber layer 141 .

The fibers 102 constituting the first fiber layer 141 can use fibers longer than the average fiber length on the multilayer absorbent body 140 . Moreover, the fiber 102 which comprises the 1st fiber layer 141 can use the fiber whose length of this fiber 102 is longer than the length of the fiber 101 which comprises the absorber 142. The longer the fiber length, the greater the distance between the fibers, and the fibers are less likely to collide, so the degree of freedom between the fibers is high.

The fibers 101 constituting the absorbent body 142 can use fibers shorter than the average fiber length of the multilayer absorbent body 140 . Furthermore, the fiber 101 which comprises the absorber 142 can use the fiber which the length of the said fiber 101 is shorter than the length of the fiber 102 which comprises the 1st fiber layer 141. The shorter the fiber length, the smaller the distance between fibers and the higher the fiber density. In this way, a density gradient can be provided on the convex portion 2A, and even if a small amount of menstrual blood or sweat adheres to the top of the convex portion 2A, liquid such as menstrual blood can be properly transferred to the absorbent body 142 . Fibers containing many pulps with short fiber lengths can be used.

In order to reduce the degree of freedom of the fibers 101 constituting the absorbent body 142, for example, the absorbent body 142 may contain fibers in a three-dimensional crimped shape. The three-dimensional crimped shape is, for example, a spiral shape, a zigzag shape, an Ω shape, or the like. For example, when all the fibers are oriented in the planar direction and some of them are oriented in the thickness direction, since the buckling strength of the fibers themselves acts in the thickness direction, the absorber is not easily deformed even if an external pressure is applied.

Moreover, if the three-dimensional crimped shape is a spiral shape, it will return to its original shape when the pressure is released from the state where the pressure is applied. Therefore, even if the second fiber layer 142 has some deformation under excessive external pressure, the external pressure will be released. It is ideal that it is easy to return to the original thickness after pressing.

The method of forming a three-dimensional crimped shape on the fiber includes mechanical crimping and thermal shrinkage.

Mechanical crimping is applied to the spun continuous linear fiber while adjusting the peripheral speed difference of the line speed, heat and pressure conditions. The greater the number of crimps per unit length of the crimpable fibers, the higher the buckling strength against external pressure. Specifically, the number of crimps is 10 to 35 pieces/inch, preferably selected from the range of 15 to 30 pieces/inch.

The heat-shrinkable shape imparting is, for example, imparting a crimped shape by heating fibers formed of two or more resins having different melting points. Specifically, fibers designed to have different thermal shrinkage rates due to differences in melting points are heated, and three-dimensional crimping is expressed by the difference in thermal shrinkage rates. The resin composition viewed from the cross section of the fiber is, for example, an eccentric type of a core-sheath structure, or a side-by-side type in which the left and right components have different melting points. The heat shrinkage rate of the fiber is 5-90%, preferably in the range of 10-80%.

Here, the heat shrinkage rate was measured as follows, (1) using 100% of the measured fiber to make a fiber web of 200 g/m ² , (2) cutting the fiber into a size of 250 × 250 mm, (3) cutting the fiber web The sample is placed in an oven at 145°C for 5 minutes for heat treatment, (4) measure the length dimension of the sample after heat shrinkage by the heat treatment, (5) calculate the heat from the length difference before and after heat shrinkage Shrinkage.

The content of the three-dimensional crimped fibers on the absorbent body 142 is, for example, 30% by mass or more, preferably 50% by mass or more. When the content of the three-dimensionally crimped fibers is 30% by mass or more, it is preferable that the absorbent body 142 becomes easy to retain compression and recover from compression.

Here, the first fiber layer 141 may also contain fibers in a three-dimensional crimped shape. The content of the three-dimensional crimped fibers on the first fiber layer 141 is, for example, 30% by mass or less, preferably 50% by mass or less. The fibers 101 constituting the first fiber layer 141 can reduce the fiber density of the first fiber layer 141 by including fibers in a three-dimensional crimped shape. In this case, since the transferability of the liquid from the first fiber layer 141 to the absorbent body 142 is good, it is preferable. In addition, by making the content of the three-dimensionally crimped fibers on the first fiber layer 141 70% by mass or less, it is possible to suppress the foreign body feeling caused by the end faces (cuts) of the three-dimensionally crimped fibers touching the skin.

In addition, fibers 101 constituting absorber 142 may have a higher Young's modulus than fibers 102 constituting first fiber layer 141 .

Here, as the fiber with a high Young's modulus used for the fiber 101 constituting the absorber 142, a fiber with a high fiber density can be used. For example, fibers having a higher fiber density than the fibers 102 constituting the first fiber layer 141 can be used.

Moreover, the fiber 101 which comprises the absorber 142, for example, the fiber 101 with a small average content of an inorganic substance can be used. For example, the fibers 102 having an average content of inorganic substances less than the fibers constituting the first fiber layer 141 are used. The inorganic substance is, for example, an inorganic filler such as titanium oxide.

The absorber 142 can be formed by air-laying using fibers having a shorter fiber length than the fibers 102 constituting the first fiber layer 141 . When forming the absorbent body 142 by laminating the fibers 101 with a short fiber length to a predetermined thickness, an air-laid method can be suitably used.

When the fibers having a short fiber length are laminated by the air-laying method, the fiber orientation of the fibers tends to be in the thickness direction of the fiber layer. Fluids such as menstrual blood are easily transferred along the fiber orientation. Therefore, for example, when the absorbent body (inner layer) 142 is laminated by air-laying and the fiber orientation is adjusted to face the thickness direction, it is possible to suppress the flow of liquids to the absorbent body (inner layer) 142. The transferred fluid such as menstrual blood spreads in the plane direction of the surface of the multilayer absorbent body 140 . Furthermore, since the fibers of the absorber (inner layer) 142 are oriented in the thickness direction, the buckling strength is improved, and the convex portion is not easily deformed even when an external pressure is applied, which is preferable.

1-3-2. Fiber orientation, fiber density or fiber unit area weight

1-3-2-1. Fiber Orientation

As shown in FIG. 16 , the fibers 101 and 102 constituting the bottom of the groove portion 1A are oriented substantially in the width direction (lateral direction, CD). The fibers 101 and 102 on the first fiber layer 141 and the absorber 142 are oriented in the width direction (lateral direction, CD) as a whole. Here, by adjusting the degrees of freedom and properties of the fibers 101 and 102 constituting the first fiber layer 141 and the absorber 142, or adjusting the intensity of the injected gas, the orientation and orientation of the fibers 102 on the first fiber layer 141 can be adjusted respectively. Orientation of the fibers 101 on the absorbent body 142 . For example, adjustment may be made so that the ratio of the fibers 102 oriented in the width direction on the first fiber layer 141 is different from the ratio of the fibers 101 oriented in the width direction on the absorber 142 .

Further, the fibers 101 and 102 on the sides of the convex portion 2A are oriented along the longitudinal direction (MD) of the convex portion 2A. For example, the fibers 101 and 102 are oriented in the longitudinal direction compared to the orientation of the fibers 101 and 102 in the central portion (region between both sides) of the convex portion 2A.

In addition, in the region constituting the bottom of the groove portion 1A, the content rate of transversely oriented fibers per unit area is higher than that of the central portion 9 , and the content rate of vertically oriented fibers per unit area in the side portion 8 is higher than that of the central portion 9 . In addition, in the central portion 9 , there are more fibers 101 and 102 oriented in the thickness direction than in the region constituting the bottom of the groove portion 1A or the side portion 8 . In this way, even if the thickness of the convex portion 2A decreases due to the application of a load to the central portion 9 and the load is released, the rigidity of the fibers 101 and 102 oriented in the thickness direction makes it easy to return to the original height. That is, a nonwoven fabric with high recovery from compression can be produced.

1-3-2-2. Fiber density

As shown in FIG. 16 , the density of the fibers 101 and 102 constituting the bottom region of the groove portion 1A is adjusted to be lower than that of the convex portion 2A. The fiber density in the region constituting the bottom of the groove portion 1A can be freely adjusted according to various conditions such as the amount and tension of a fluid mainly composed of gas (for example, hot air).

As described above, the density of the fibers 101 and 102 of the convex portion 2A is adjusted to be higher than the region constituting the bottom of the groove portion 1A. In addition, the fiber density of the convex portion 2A can be freely adjusted according to various conditions such as the amount and tension of a fluid (for example, hot air) mainly composed of gas.

1-3-2-3. Weight per unit area of fiber

As shown in FIG. 16 , the fiber basis weight of the fibers 101 and 102 constituting the bottom region of the groove portion 1A is adjusted to be lower than that of the convex portion 2A. In addition, the fiber basis weight in the region constituting the bottom portion of the groove portion 1A is adjusted to be lower than the average value of the fiber basis weight of the entirety including the groove portion 1A and the convex portion 2A.

As described above, the fiber basis weight of the fibers 101 and 102 of the convex portion 2A is adjusted to be larger than the area constituting the bottom of the groove portion 1A.

The fiber basis weight of the entire multilayer absorbent body 140 is 10 to 200 g/m ² , preferably 20 to 100 g/m ² . For example, when the multilayer absorbent body 140 is used as a top sheet and absorbent body of an absorbent article such as a sanitary napkin worn on the body, the fiber basis weight of the entire multilayer absorbent body 140 is less than 10 g/m ² circumstances, such as when there is a risk of breakage during use. When it is more than 200 g/m ² , if another absorber is provided below, it may not be easy for the liquid to transfer downward smoothly.

Here, the fiber basis weight of the region constituting the bottom of the groove portion 1A is 90% or less of the fiber basis weight of the convex portion 2A, preferably 3 to 90%, more preferably 30 to 70%. When the fiber basis weight of the region constituting the bottom of the groove portion 1A is greater than 90% of the fiber basis weight of the convex portion 2A, the liquid such as menstrual blood dripped on the groove portion 1A is directed downward (the side opposite to the dripping liquid side). ) moves, the resistance increases, and sometimes the menstrual blood overflows from the groove portion 1A. On the other hand, if the fiber basis weight of the region constituting the bottom of the groove portion 1A is less than 3% relative to the fiber basis weight of the convex portion 2A, the strength of the multilayer absorbent body 140 is weakened, which may be unsuitable for the intended use. For example, when the multilayer absorbent body 140 is used as a top sheet of an absorbent article such as a sanitary napkin, damage may occur while the absorbent article is being used.

The fiber basis weight of the convex portion 2A is, for example, 15 to 250 g/m ² , preferably 25 to 120 g/m ² . Also, the fiber density of the convex portion 2A is 0.20 g/cm ³ or less, preferably 0.005 to 0.20 g/cm ³ , more preferably 0.007 to 0.07 g/cm ³ .

When the fiber basis weight of the convex portion 2A is less than 15 g/m ² or the density is lower than 0.005 g/cm ³ , the convex portion 2A may easily deform due to the weight of liquid such as menstrual blood or external pressure. Moreover, once absorbed menstrual blood sometimes tends to flow back under pressure.

When the fiber basis weight of the convex portion 2A is higher than 250 g/m ² or the density is higher than 0.20 g/cm ³ , the menstrual blood excreted in the convex portion 2A is difficult to move downward, and sometimes stays in the convex portion. Part 2A.

The fiber basis weight of the region constituting the bottom of the groove portion 1A is, for example, 3 to 150 g/m ² , preferably 5 to 80 g/m ² . Furthermore, the fiber density of the region constituting the bottom of the groove portion 1A is 0.18 g/cm ³ or less, preferably 0.002 to 0.18 g/cm ³ , more preferably 0.005 to 0.05 g/cm ³ .

When the fiber basis weight of the region constituting the bottom of the groove portion 1A is less than 3 g/m ² or the density is less than 0.002 g/cm ³ , when used as a top sheet and absorbent body, as described above, the The multilayer absorbent body 140 may be easily damaged during use on an absorbent article provided as a top sheet of an absorbent article such as a sanitary napkin.

On the other hand, when the fiber basis weight of the region constituting the bottom of the groove portion 1A is greater than 150 g/m ² or the density is greater than 0.18 g/cm ³ , liquid such as menstrual blood dripping into the groove portion 1A may be deposited in the groove in volume. Part 1A. In this case, the liquid may overflow from the groove portion 1A.

Here, the fiber basis weight ratio of the first fiber layer 141 and the absorber 142 is in the range of 10:90 to 90:10, preferably in the range of 20:80 to 50:50. When the multilayer absorbent body 140 is used as a top sheet of an absorbent article such as a sanitary napkin, or as a top sheet combined with an absorbent body, if the fiber basis weight of the first fiber layer 141 is higher than that of the multilayer absorbent body 140 If the fiber basis weight is less than 10%, the first fiber layer may be damaged and the absorbent body may be exposed. Conversely, if the fiber basis weight of the first fiber layer 141 is higher than 90% of the fiber basis weight of the multilayer absorbent body 140, the absorption capacity is low, and even a small amount of excrement may leak out.

When groove portion 1A or convex portion 2A satisfies the above conditions, for example, even when a large amount of menstrual blood is excreted on multilayer absorbent body 140 or highly viscous menstrual blood is excreted, menstrual blood can be prevented from spreading on the surface. For example, even if the multilayered absorbent body 140 is subjected to external pressure and the convex portion 2A is slightly deformed, the space on the groove portion 1 (dimple) 1A is easily maintained. In some cases, it can also inhibit the spread of large areas on the surface. Furthermore, even if once absorbed menstrual blood or the like flows back under external pressure, since the contact area with the skin is small, it can be prevented from adhering to the skin again in a large area.

By increasing the fiber basis weight of the convex portion 2A, the number of fibers increases, so the number of melting points increases, and the porous structure is maintained.

Here, when the multilayer absorbent body 140 of this embodiment is used in absorbent articles such as sanitary napkins, since the first fiber layer 141 and the absorbent body 142 as the top sheet are molded simultaneously, the There is practically no gap between the first fiber layer 141 and the absorber 142 . Therefore, menstrual blood and the like can be appropriately conveyed from the surface layer of the absorbent article to the absorbent body. This is the same as the fourth embodiment, the fifth embodiment, and the absorbent article described later.

1-3-3. Manufacturing method

Hereinafter, the manufacturing method of the multilayer absorber 140 of this embodiment is demonstrated.

First, the fiber web 100 having a multilayered fiber assembly including a first fiber assembly (not shown) and a fiber assembly for an absorbent body (not shown) is placed on the upper surface side of the mesh support member 210 as an air-permeable support member. , the first fiber aggregate is a fiber aggregate formed in a substantially sheet shape, and the fibers constituting the fiber aggregate have a degree of freedom; the fiber aggregate for the absorber is stacked on one side of the first fiber aggregate, A substantially sheet-like fiber aggregate containing water-absorbent fibers is in a state where the fibers constituting the fiber aggregate have a degree of freedom. In other words, the mesh support member 210 supports the fiber web 100 from below. Here, predetermined fibers may be stacked on a predetermined surface of the mesh support member 210 to form the above-mentioned multilayered fiber assembly.

Then, the mesh support member 210 in the state of supporting the fiber web 100 is moved in the machine flow direction (MD). Then, the multilayer absorbent body 140 of this embodiment can be manufactured by continuously injecting gas from the upper surface side of the moving fiber web 100 .

The multilayer absorbent body 140 of this embodiment can be manufactured by the above-mentioned absorbent body manufacturing apparatus 90 . The above-mentioned description can be referred to for the manufacturing method etc. of the absorber of this absorber manufacturing apparatus 90.

1-4. Fourth Embodiment

A multilayer absorbent body 150 according to a fourth embodiment will be described with reference to FIG. 17 . The multilayer absorbent body 150 is a multilayer absorbent body in which a plurality of openings 3A are formed at predetermined intervals at the bottom of the groove portion 1A which is a low fiber basis weight region of the multilayer absorbent body 140 according to the third embodiment.

Here, in the multilayer absorbent body 150, a plurality of openings 3A serving as low fiber basis weight portions are formed at the bottom of the groove portion 1A, but instead of the opening portions 3A, a multilayer absorbent body such that the groove portion 1A is formed may be formed. 150 is a recessed portion formed with a thinner thickness. In addition, the opening 3A also includes a shape in which the opening is not completely formed in the thickness direction (only a part of the opening 3A communicates).

The bottom surface of the groove portion 1A of the multilayer absorber 150 has a shape having a step along the direction in which the groove portion 1A is formed. While forming a plurality of low fiber basis weight portions such as the groove portion 1A continuously at predetermined intervals in the direction in which the groove portion 1A is formed, by forming a height difference along the direction in which the groove portion 1A is formed, liquid such as menstrual blood can be prevented from flowing along the groove. Part 1A flows and is therefore the ideal shape.

As shown in FIG. 17 or FIG. 18 , all or part of side wall portions 33A constituting the respective peripheries of the plurality of openings 3A are covered with a part of the first fiber layer 141 .

For example, when viewed from the direction (MD) in which the groove portion 1A of the opening portion 3A extends, the side wall portions 33A on both sides are covered by the first fiber layer 141, and when viewed from the direction (MD) in which the groove portion 1A of the opening portion 3A extends. , the side wall portion 33A at the end portion is not covered by the first fiber layer 141 . Moreover, the absorber 142 provided in the lower layer is exposed in the region not covered with the 1st fiber layer 141 on this side wall part 33A.

Furthermore, as shown in FIG. 18 , in the region where the opening 3A is not formed on the groove portion 1A, the bottom of the groove portion 1A has a region composed of the first fiber layer 141 and a region composed of the absorber 142 . Specifically, there is a region not covered by the first fiber layer 141 around the opening 3A of the groove 1A, and near the end of the periphery viewed in the direction (MD) in which the groove 1A extends. The absorbent body 142 is exposed in this region.

In addition, a plurality of openings are formed at positions corresponding to the openings 3A of the multilayer absorbent body 150 at the same time as the plurality of grooves are formed in the first fiber layer 141 . Compared with the opening 3A in the multilayer absorbent body 150 , the opening is formed in a vertically elongated elliptical shape when viewed from the direction (MD) in which the groove 1A extends.

Here, when the multilayer absorbent body 150 of this embodiment is used for absorbent articles such as sanitary napkins, it is possible to suppress the deterioration of absorbency and improve the absorbency similarly to the case of using the absorbent body 120 of the second embodiment described above. Compatibility with the body, etc.

Furthermore, when the first fiber layer 141 is composed mainly of synthetic fibers and the absorbent body 142 is composed mainly of water-absorbent fibers, the menstrual blood falling into the depression (not shown) and/or the opening 3A The liquid is not easily absorbed by the concave portion and/or the side wall portion 33A of the opening portion 3A, which is seen from the MD on both sides. That is, since all or a part of the side wall portion 33A constituting the periphery of the recessed portion (not shown) and/or the opening portion 3A formed in the region of the bottom of the groove portion 1A constituting the low fiber basis weight region is covered by the second A fibrous layer 141 covers, so liquids such as menstrual blood falling into the recessed portion and/or opening 3A are not easily transferred to the absorbent fibers of the absorber 142 from both sides of the side wall portion 33A as viewed from the MD. Then, liquid such as menstrual blood transfers to the water-absorbent fibers of absorber 142 from the end viewed in the direction in which groove portion 1A is continuously formed (machine flow direction, MD). By doing so, it is possible to further suppress penetration of liquid such as menstrual blood in the width direction.

1-5. Fifth Embodiment

A multilayer absorbent body 160 according to a fifth embodiment will be described with reference to FIG. 19 . The multilayer absorbent body 160 is a multilayer absorbent body in which a second fiber layer is further provided on the multilayer absorbent body 140 of the third embodiment. That is, it is a multilayer absorbent body in which the second fiber layer 143 is further provided on the surface of the absorbent body 142 opposite to the first fiber layer 141 on the multilayer absorbent body 140 of the third embodiment.

The first fiber layer 141 is preferably laminated by carding. The absorbent body 142 is preferably formed by laminating fibers constituting the absorbent body 142 on one surface of the first fiber layer 141 by air-laying.

The second fiber layer 143 is preferably laminated by carding. By further providing the second fiber layer 143, predetermined functions, strength, and the like can be imparted. For example, by providing the second fiber layer 143, shape retention, cushioning properties, and the like can be improved.

A method for manufacturing the multilayer absorbent body 160 of the present embodiment will be described. First, a multilayer fiber web having a first fiber web, a fiber web for an absorbent body, and a second fiber web is placed on a predetermined surface of the mesh support member 210 shown in FIG. Supported on the mesh support member 210, wherein the first fiber web is a sheet-like fiber web in which the fibers constituting the fiber assembly have a degree of freedom; the fiber web for the absorbent body is stacked on the first fiber web. On one side of the web, the fibrous web containing water-absorbent fibers formed in a roughly sheet shape is in a state where the fibers constituting the fiber assembly have a degree of freedom; the second web is provided on the opposite side of the first fiber layer of the web for absorbents. On the other hand, a substantially sheet-shaped fiber web is formed, and the fibers constituting the fiber web have a degree of freedom.

Then, the multilayered fiber assembly supported by the net-like support member 210 is moved in a predetermined direction (machine flow direction, MD) by a predetermined moving mechanism. Then, for example, a fluid mainly composed of gas is sprayed from the other surface side of the multilayered fiber assembly moved in the above-mentioned predetermined direction by a spraying mechanism.

Here, by disposing the second fiber web on the predetermined surface of the mesh support member 210, the fibers including the water-absorbent fibers constituting the fiber web for the absorbent body are laminated on the side of the mesh support member 210 of the second fiber web. A fiber web for an absorbent body is formed on the surface opposite to the fiber web for an absorbent body, and the first fiber web is laminated on the side opposite to the second fiber web side of the formed fiber web for an absorbent body to form a multilayer fiber web. Here, the fiber web for an absorber is formed on a predetermined surface on the second fiber assembly by, for example, an air-laying method.

1-6. Sixth Embodiment

An absorber 111 according to a sixth embodiment will be described with reference to FIG. 20 . The absorbent body 111 is an absorbent body that further includes the polymer absorbent body 103 on the absorbent body 110 of the first embodiment.

As shown in FIG. 20 , in the absorber 111 of the present embodiment, the polymer absorber 103 is provided in a biased manner in the region forming the bottom of the groove portion 1A which is a low fiber basis weight and the convex region which is a high fiber basis weight. The side opposite to the surface of the shaped part 2. The polymer absorber 103 exists in a state of being mixed with the fibers 101 constituting the absorber 111 . The shape of the polymer absorber 103 is not particularly limited, and may be powdery, granular, or fibrous.

The absorber 111 of the present embodiment can be formed by spraying a fluid mainly composed of gas onto the fiber web 100 formed by mixing the fibers 101 containing water-absorbing fibers and the polymer absorber 103 to one side of the fiber web 100. . By spraying a fluid mainly composed of a gas on one side of the fiber web 100, the polymer absorber 103 can be moved to the other side while forming the grooves 1 and the convex parts 2.

When the absorber 111 is produced by the above method, the polymer absorber 103 is preferably fibrous so that the fluid mainly composed of gas is not ejected to the outside of the absorber 111 .

When a liquid (for example, menstrual blood) is continuously or intermittently dripped onto the side of the absorbent body 111 in this embodiment on which the grooves 1 and the protrusions 2 are formed, the liquid is first absorbed by the water-absorbent fibers. Then, the liquid not absorbed by the water-absorbent fibers is absorbed by the polymer absorbent body 103 . Here, since the polymer absorber 103 is provided on the side opposite to the surface forming the groove portion 1 and the convex portion 2, even if it absorbs liquid and swells, it is not easy to make the groove portion 1 and the convex portion The shape of the shaped portion 2 is deformed.

1-7. Seventh Embodiment

An absorber 112 according to a seventh embodiment will be described with reference to FIG. 21 . The absorber 112 is an absorber in which the polymer absorber 103 is provided on the groove portion 1 of the absorber 110 of the first embodiment.

As shown in FIG. 21 , in the absorber 112 of the present embodiment, the polymer absorber 103 is provided in the groove portion 1 . Specifically, it is provided in the recessed portion of the groove portion 1 to house the polymer absorbent. In this way, the crown region of the convex portion 2 and the polymer absorber 103 are exposed on the upper surface side of the absorber 112 . The absorber 112 of the present embodiment can be formed by accommodating the polymer absorber 103 in the concave portion of the groove portion 1 of the absorber 110 of the first embodiment.

When a liquid (such as menstrual blood) is continuously or intermittently dripped on the side of the absorbent body 112 of the present embodiment where the groove portion 1 and the convex portion 2 are formed, the liquid dripped on the convex portion 2 is absorbed by the water-absorbent fiber. The liquid dropped on the polymer absorber 103 is directly absorbed by the polymer absorber 103 .

1-8. Eighth Embodiment

Based on FIG. 22, the absorber 113 which concerns on 8th Embodiment is demonstrated. The absorber 113 is an absorber in which the absorber 110 of the first embodiment is laminated on the upper surface side of the absorber 112 of the seventh embodiment so that the grooves 1 and the like face the absorber 112 side.

As shown in FIG. 22 , in the absorber 113 of the present embodiment, the polymer absorber 103 is accommodated in a space between the laminated absorber 112 and the absorber 110 . Specifically, the surface of the absorber 112 on which the grooves 1 and the projections 2 are formed and the surface of the absorber 110 on which the grooves 1 and the projections 2 are formed can be stacked so that the mutual projections 2 Absorbent body 113 is formed facing the top of the head in abutting manner. Further, the polymer absorber 103 is provided on the absorber 113 in a region where the groove portion 1 of the absorber 112 and the groove portion 1 of the absorber 110 face each other.

When a liquid (such as menstrual blood) is continuously or intermittently dripped on one side of the absorbent body 113 of this embodiment, first, the liquid is absorbed by the water-absorbent fibers, and the liquid or the like that is not absorbed by the water-absorbent fibers is absorbed by the polymer absorbent body 103. absorb. Since the polymer absorbent body 103 is accommodated inside the absorbent body 113 with a space for expansion, it does not leak out even if it absorbs liquid and expands, and the shape of the entire absorbent body 113 is not greatly deformed.

1-9. Fiber composition

The fiber configurations of the first fiber layer, the second fiber layer, and the absorber in the above-mentioned embodiment will be described below by way of example.

The first fiber layer is, for example, a fiber layer mixed with fiber A and fiber B. Fiber A is a core-sheath structure of low-density polyethylene (melting point 110°C) and polyethylene terephthalate, with an average fineness of 3.3dtex, The average fiber length is 51mm, coated with a hydrophilic oil agent; fiber B is a core-sheath structure of high-density polyethylene (melting point 135°C) and polyethylene terephthalate, with an average fineness of 3.3dtex and an average fiber length of It is 51mm and coated with waterproof oil. Fiber A and fiber B were contained at a mixing ratio of 70:30, and the fiber basis weight was adjusted to 15 g/m ² . The absorbent body is 100% pulverized pulp, and the fiber unit area is 100 g/m ² . The first fiber layer is opened by a carding method, and the absorbent body is opened by an air-laid method. The second fiber layer is, for example, a core-sheath structure of high-density polyethylene and polyethylene terephthalate, which has an average fineness of 4.4dtex, an average fiber length of 38mm, and 100% fibers coated with a hydrophilic oil agent. fiber layer. The fiber basis weight of this fiber layer was 25 g/m ² .

In addition, the first fiber layer is, for example, a core-sheath structure of high-density polyethylene (melting point 135° C.) and polyethylene terephthalate, with an average fineness of 2.2 dtex and an average fiber length of 51 mm. Mass, 2 mass % to the core/3 mass % titanium oxide to the sheath, and a fiber layer of 100% fibers coated with a hydrophilic oil agent. The fiber basis weight of this fiber layer was 20 g/m ² . The absorber is, for example, a fiber layer containing fiber C and fiber D. Fiber C is an eccentric core-sheath structure of high-density polyethylene and polyethylene terephthalate, with an average fineness of 5.6 dtex and an average fiber length of 51 mm, mixed with 1% by mass of titanium oxide relative to the mass of the core, and coated with a hydrophilic oil agent, fiber D is rayon, with an average fineness of 3.3 dtex and an average fiber length of 45 mm. The mixing ratio of fiber C and fiber D on the fiber layer was 50:50, and the fiber basis weight was 100 g/m ² . The second fiber layer is a core-sheath structure of high-density polyethylene and polyethylene terephthalate. It is 100% fiber with an average fineness of 2.2dtex and an average fiber length of 38mm coated with a hydrophilic oil agent. The weight per unit area is 20gsm. Both the first fiber layer and the second fiber layer are opened by carding.

In addition, each of the multi-layer absorbent body composed of a fiber aggregate forming a first fiber layer by a carding method, a fiber aggregate forming an absorbent body by an air-laying method, and a fiber aggregate forming a second fiber layer by a carding method will be exemplified below. The fiber composition of the fiber layer, etc.

The first fiber layer is, for example, a core-sheath structure of high-density polyethylene and polyethylene terephthalate polypropylene, with an average fineness of 3.3dtex and an average fiber length of 51mm. 1% by mass/sheath mixed with 2% by mass of titanium oxide, 100% fibers coated with a hydrophilic oil agent, and a fiber layer formed so that the fiber basis weight was 15 g/m ² by a carding method.

The absorbent is, for example, mixed pulverized pulp and particulate polymer absorbent, mixed with the polymer absorbent in a ratio of 10% by mass of the pulverized pulp, and laminated to form fibers with a weight per unit area of 110 g/m ² by air-laying. fiber layer.

The second fiber layer is, for example, a fiber layer containing fiber C and fiber D, and fiber D is rayon with an average fineness of 3.3 dtex and a fiber length of 45 mm. The mixing ratio of fiber C and fiber D on the fiber layer was 50:50, and the fiber layer was formed by laminating fibers with a basis weight of 20 g/m ² by a carding method.

2. Absorbent articles

The absorbent article 170 will be described based on Fig. 23 . Absorbent article 170 includes first fiber layer 141 , absorbent body 142 laminated on one side of first fiber layer 141 , and liquid-impermeable sheet 144 on the side opposite to first absorbent layer 141 on absorbent body 142 . Furthermore, a second fiber layer 143 is provided between the absorbent body 142 and the liquid-impermeable sheet 144 .

On the other surface of the first fiber layer 141, a plurality of grooves 1A and a plurality of convex portions 2A are formed. The grooves 1A are recessed in the thickness direction of the absorbent article 170; While the grooves 1A are adjacent to each other, the fiber basis weight is higher than that of the region constituting the bottom of the grooves 1A.

The plurality of groove portions 1A and the plurality of convex portions 2A are stacked with the first fiber layer 141 and the absorber 142 , respectively. The absorber 142 on the convex portion 2A has a shape in which the surface on the first fiber layer 141 side of the absorbent article 170 protrudes from the same side as the other surface on the first fiber layer 141 .

Moreover, the content rate of the longitudinally oriented fiber is higher than the content rate of the horizontally oriented fiber in 2 A of several convex-shaped parts (particularly a side part). In the plurality of grooves 1A, the fibers provided in the region constituting the bottom of the plurality of grooves 1A have a higher content rate of transversely oriented fibers than a content rate of longitudinally oriented fibers.

In addition, a plurality of recesses (not shown) and/or a plurality of openings may be formed at predetermined intervals in the plurality of grooves 1A. The first fiber layer 141 covers all or part of the side walls constituting the periphery of the plurality of depressions and/or the plurality of openings and/or the plurality of openings.

Furthermore, the absorbent article of the present invention is formed, for example, by providing a liquid-impermeable sheet on a predetermined surface of the absorbent article or multilayer absorbent body in each of the above-mentioned embodiments. In particular, it is preferable that the absorbent article of the present invention is easily obtained by providing the liquid-impermeable sheet on a predetermined surface of the multilayer absorbent body of the above-mentioned third to fifth embodiments.

3. Example

3-1. First Embodiment

<Fiber Composition>

The first fiber layer uses a fiber layer mixed with fiber A and fiber B. Fiber A is a core-sheath structure of low-density polyethylene (melting point 110°C) and polyethylene terephthalate. The average fineness is 3.3dtex, and the average fiber 51mm long, coated with hydrophilic oil agent; fiber B is a core-sheath structure of high-density polyethylene (melting point 135°C) and polyethylene terephthalate, with an average fineness of 3.3dtex, an average fiber length of 51mm, and coated with waterproof Oil agent. The mixing ratio of fiber A and fiber B is 70:30, and the weight per unit area of fiber is adjusted to 15 g/m ² .

The absorber mixes fiber C and fiber D. Fiber C is an eccentric core-sheath structure of high-density polyethylene and polyethylene terephthalate, with an average fineness of 5.6dtex and an average fiber length of 51mm. The mass of titanium oxide is mixed with 1% by mass of titanium oxide, coated with a hydrophilic oil agent, fiber D is rayon, the average fineness is 3.3dtex, and the fiber length is 45mm. The mixing ratio of fiber C and fiber D is 50:50, and the fiber unit The areal weight was 100 g/m ² .

<Manufacturing conditions>

A plurality of discharge ports 913 having a diameter of 1.0 mm and a pitch of 6.0 mm are formed. In addition, the shape of the discharge port 913 is a perfect circle, and the cross-sectional shape of the hole (discharge port) is circular. The width of the discharge part 910 was 500 mm. The temperature is 105° C., and the air volume is 1200 l/min to spray hot air.

The roll made of the above-mentioned fibers was opened by a carding machine at a speed of 20 m/min to produce a multilayer fiber web, and the multilayer fiber web was cut to a width of 450 mm. The fiber web is set and conveyed on a 20-hole air-permeable web that moves in a prescribed direction at a speed of 3 m/min. The above-mentioned hot air is sprayed on one side of the multilayer fiber web through the outlet 910 shown above, and on the other hand, suction (suction) is performed from below the air-permeable web with an absorption amount less than the amount of hot air. After the unevenness (groove portion, convex portion) is formed in this way, it is conveyed into an oven set at a temperature of 125° C. and a hot air volume of 10 Hz for about 30 seconds while being conveyed by the air-permeable net.

<result>

Convex part: fiber weight per unit area 131g/ ^m2 , thickness 3.4mm (top thickness 2.3mm), fiber density 0.06g/ ^cm3 , width of one convex part 4.6mm, pitch 5.9mm .

- Absorber on convex portion: thickness: 2.9 mm (top thickness: 1.3 mm).

Grooves: fiber basis weight of 58 g/m ² , thickness of 1.7 mm, fiber density of 0.03 g/cm ³ , width of one groove of 1.2 mm, and pitch of 5.8 mm.

·Shape: the back surface of the groove portion is located at the backmost side of the absorber, and the backside shape of the convex portion is raised upward, and is provided at a position not forming the backmost side of the absorber. The convex portion is dome-shaped, and the convex portion and the groove portion are continuously formed along the longitudinal direction, and are formed to overlap each other when viewed in the width direction. In addition, the outermost surface of the convex portion not only partially forms the structure of intersection strength between different fibers, but also forms the lowest density.

3-2. Second Embodiment

<Fiber Composition>

The fiber constitution is the same as that of the first embodiment.

<Manufacturing conditions>

Utilizing the nozzle design shown above, while spraying hot air at a temperature of 105°C and an air volume of 1000 l/min, it is sucked from the bottom of the breathable net with approximately the same or slightly stronger absorption (suction air volume) than the hot air volume. ).

<result>

The obtained absorber will be described below.

·Convex part: the fiber basis weight is 129g/m ² , the thickness is 2.5mm, the fiber density is 0.05g/cm ³ , the width of one convex part is 4.7mm, and the pitch is 6.1mm.

- Absorber on convex portion: thickness: 2.9 mm.

Grooves: fiber basis weight of 33 g/m ² , thickness of 1.8 mm, fiber density of 0.02 g/cm ³ , width of one groove of 1.4 mm, and pitch of 6.1 mm.

- Shape: The bottom surface shape of the convex part is a flat shape.

3-3. Third Embodiment

<Fiber Composition>

The first fiber layer uses a core-sheath structure of high-density polyethylene and polyethylene terephthalate. It has an average fineness of 3.3 dtex and an average fiber length of 51 mm. 1% by mass is mixed to the core with respect to each mass of the core-sheath. / Mix 2% by mass of titanium oxide to the sheath, 100% fibers coated with a hydrophilic oil agent, and make a fiber layer with a fiber basis weight of 15 g/m ² by carding.

The absorbent body is 100% pulverized pulp with a fiber basis weight of 100 g/m ² .

For example, it is a fiber layer containing fiber C and fiber D. Fiber C is an eccentric core-sheath structure of high-density polyethylene and polyethylene terephthalate, with an average fineness of 5.6dtex and an average fiber length of 51mm. , mixed with 1% by mass of titanium oxide relative to the mass of the core, coated with a hydrophilic oil agent, fiber D is rayon, the average fineness is 3.3dtex, and the average fiber length is 45mm. The mixing ratio of fiber C and fiber D on this fiber layer was 50:50, the fiber basis weight was 20 g/m ² , and the fiber layer formed was laminated by a carding method.

<Manufacturing conditions>

The same manufacturing conditions as the first embodiment.

<result>

The obtained absorber will be described below.

·Convex part: Fiber weight per unit area is 162g/ ^m2 , thickness is 2.9mm, fiber density is 0.06g/ ^cm3 , width of one convex part is 4.7mm, pitch is 6.1mm.

- 1st fiber layer/absorbent body/2nd fiber layer on convex part: Thickness 1.0mm/1.3mm/0.6mm.

Grooves: fiber basis weight of 88 g/m ² , thickness of 1.8 mm, fiber density of 0.05 g/cm ³ , width of one groove of 1.4 mm, and pitch of 6.1 mm.

3-4. Fourth Embodiment

<Fiber Composition>

The fiber constitution is the same as that of the first embodiment.

<Manufacturing conditions>

It is the same as the first embodiment except that the following supports are used instead of the air-permeable net.

<support>

Using the plate-shaped supporting member 230 shown in FIG. 24 , the hole 233 is a plate-shaped supporting member formed with a length of 2 mm x a width of 70 mm and an interval of 3 mm from the adjacent hole 233 . The plate-shaped support member 230 has a thickness of 0.5 mm. The material is stainless steel.

<Manufacturing conditions>

Same as the first embodiment

<result>

The obtained absorber will be described below.

·Convex part: the fiber basis weight is 155g/m ² , the thickness is 2.8mm, the fiber density is 0.06g/cm ³ , the width of one convex part is 4.7mm, and the pitch is 6.5mm.

- Absorber on convex portion: thickness: 1.5 mm.

Grooves: fiber basis weight 77 g/m ² , thickness 1.2 mm, fiber density 0.06 g/cm ³ , width of one groove 1.8 mm, pitch 6.5 mm.

Micro-protrusions on the groove: the weight per unit area of fibers is 93g/m ² , the thickness is 1.9mm, the fiber density is 0.05g/cm ³ , the width of one micro-protrusion is 1.8mm, and the length of one micro-protrusion is 1.5mm, CD pitch is 6.5mm, MD pitch is 5.0mm.

・The micro-depressions (openings) on the grooves: fiber weight per unit area 0g/m ² , thickness 0mm, fiber density 0g/cm ³ , width of one micro-depression 1.8mm, one micro-depression The length is 3.2mm, the CD pitch is 6.5mm, and the MD pitch is 5.0mm, and the opening area of one micro-depression is ^4.2mm2 , which is a vertically long rectangular shape with rounded corners.

• Shape: Micro-protrusions and micro-depressions (openings) are formed in the groove portion 1 .

4. Application example

Examples of applications of the absorbent body of the present invention include absorbent articles such as sanitary napkins, panty liners, and diapers. It can be used as these absorbers or as a top sheet and absorber. In this case, the convex portion may face one of the skin side and the back side opposite to the skin side. By forming it on the skin side, since the contact area with the skin is reduced, it is less likely to have a wet feeling caused by body fluids. . In addition, it can also be used in many ways, such as wipes for removing dust or dirt adhering to the floor or the body, wet wipes or wet wipes, face masks, and breast milk liners that have been filled with medicine in advance.

Here, as an example of the present application, the absorber contains water-absorbent fibers, has unevenness on one side, the fiber basis weight at the bottom of the recess is relatively low, and most of the fibers on the recess are wide (lateral) The case where the direction-oriented absorbent body is used for the absorbent article in which the convex part was provided in the top sheet side is demonstrated.

The fiber basis weight in the region constituting the bottom of the groove portion 1 is relatively low because the fibers move when the groove portion 1 is formed. And, since the side portion 8 of the convex portion 2 is mainly formed by the moved fibers, there are many longitudinally oriented fibers oriented in the longitudinal direction (longitudinal direction, MD) in the side portion 8 . In this way, since the liquid dripping or moving to the side portion 8 is guided in the longitudinal direction, it is possible to suppress the liquid from spreading in the width direction (CD) and causing leakage, and the absorption efficiency of the liquid by the absorber can be improved. Furthermore, since the absorbent article can be easily deformed starting from the groove portion 1 and has high conformability to the body, it is unlikely to give the user a feeling of foreign body. And, since the fibers of the side portions 8 of the convex portion 2 are dense, the rigidity is high, and since the central portion 9 of the convex portion 2 contains many fibers oriented in the thickness direction, even if the convex portion 2 is applied The load in the thickness direction is also not easily deformed. Furthermore, even if a load is applied and the convex portion deforms, it is easy to return to its original volume due to its high compression recovery. In this way, the liquid once absorbed by the absorber is less likely to flow back, and the returned liquid is less likely to adhere to the skin.

5. Various components

5-1. Fiber aggregate

The fiber aggregate (fiber web) is formed into a substantially sheet-like fiber aggregate containing water-absorbent fibers, and the fibers constituting the fiber aggregate have a degree of freedom. In other words, it is a fiber assembly with degrees of freedom between fibers. In other words, the fiber aggregate is in a free state where at least a part of the fibers constituting the fiber aggregate is in a free state. In addition, the fiber aggregate exists in a state where at least a part of fibers constituting the multilayer fiber aggregate can change its positional relationship. This fiber aggregate can be produced, for example, by spraying mixed fibers mixed with many fibers to form a fiber layer of a predetermined thickness. In addition, for example, a plurality of different fibers may be divided and laminated to form a fiber layer and ejected.

The fiber aggregate of the present invention includes, for example, a fiber web formed by a carding method, or a fiber web before thermal fusion between fibers is solidified. Also, for example, there is a web formed by an air-laid method or a fiber web before thermal fusion and solidification of fibers are performed. In addition, it may be a fiber web before thermal fusion and solidification after embossing by a point bonding method. In addition, it may be a fiber assembly before spinning by a spunbond method or embossing, or a fiber assembly before embossing is thermally melted and solidified. Also, it may be a semi-interwoven fiber web formed by a needle punching method. Also, it may be a semi-interlaced fiber web formed by a spunlace method. It may be a fiber aggregate before spinning by a melt-blowing method and thermal fusion between fibers causes solidification. In addition, it may be a fiber aggregate before being solidified by solvent or heat fusion by a solvent bonding method. Also, these can be stacked to form multilayers.

When the fiber aggregate is formed of short-fiber fibers, or when there are many short-fiber fibers, it is preferable to produce the fiber aggregate for absorbent body by air-laying. Furthermore, when the fiber aggregate is formed of fibers with long fiber lengths, or when there are many fibers with long fiber lengths, it is preferable to produce the fiber aggregate for absorbent body by a carding method.

In addition, it is preferable that the fibers are easily rearranged by air flow (gas) and that the degree of freedom among the fibers is high, and that the web is formed only by interweaving before heat fusion. And, in order to carry out absorber processing while keeping the shape after forming grooves (concave-convex) etc. by many air (gas) flows described later, it is preferable to use a prescribed heating device or the like for oven processing (heating). Processing) to thermally melt the thermoplastic fibers contained in the fiber aggregate.

5-2. Fiber

The absorbent core and absorbent article of the present invention contain at least water-absorbent fibers. Water-absorbent fibers are fibers having water-absorbing properties and fibers provided with water-absorbing properties. Fibers having water absorption are, for example, cellulose fibers. The cellulosic fiber is, for example, ground pulp or semi-synthetic cellulose such as triacetic acid. Can be used alone or in combination.

The water-absorbent fibers are, for example, thermoplastic resins such as low-density polyethylene and polyamide. In addition, in order to impart water absorption, there are, for example, fibers that have been treated by mixing a hydrophilic agent or coating, or that have been imparted hydrophilicity by corona treatment or plasma treatment. These fibers are, for example, fibers using various resins alone or composite fibers formed by structurally combining multiple types of fibers.

The conjugate fiber is, for example, a core-sheath type in which a core component has a higher melting point than a sheath component, an eccentric core-sheath type, a side-by-side type in which left and right components have different melting points, and the like. In addition, hollow, flat, Y-shaped or C-shaped, three-dimensionally crimped fibers with latent crimps or surface crimps, split fibers that are split by physical loads such as water flow, heat, or embossing, etc. can also be used.

When used as an absorbent body, the fineness of the above-mentioned fibers imparted with water absorption or fibers with water absorption is in the range of 2.2 to 8.8 dtex in consideration of liquid penetration or retention. In the case of direct contact with the skin like the first fiber layer, it is preferably in the range of 1.1 to 8.8 dtex in consideration of the penetration of liquid and the feeling of contact with the skin.

In addition, inorganic fillers such as titanium oxide, barium sulfate, and calcium carbonate may be contained in order to improve emulsification. In the case of a core-sheath composite fiber, only the core may contain the inorganic filler, or the sheath may also contain the inorganic filler.

Furthermore, in order to form a three-dimensional crimped shape, predetermined surface crimped fibers or latent crimped fibers may be mixed. Here, the three-dimensional crimped shape is a shape such as a spiral shape, a zigzag shape, or an omega shape, and even if the fiber orientation is entirely oriented in the plane direction, a part is oriented in the thickness direction. In this way, since the buckling strength of the fiber itself acts in the thickness direction, even if an external pressure is applied, the volume is not easily deformed. Moreover, among these, if the fiber is in a helical shape, the shape returns to its original shape when the applied external pressure is released. Even if the non-woven fabric is slightly thinned and deformed by excessive external pressure, it is easy to return to its original shape after the external pressure is released. thickness of.

Surface crimped fiber is a general term for fibers crimped in advance by mechanical crimping to impart a shape or a core-sheath structure using eccentric or side-by-side. Latent crimped fibers are fibers that have been crimped by heating.

The mechanical crimping method can control the crimping state of the continuous linear fiber after spinning through the peripheral speed difference in the direction of the mechanical flow, heat, and pressure. The greater the number of crimps per unit length of the fiber, the higher the buckling strength under external pressure. For example, the number of crimps per unit length of the fiber is 10 to 35 crimps/inch, preferably 15 to 30 crimps/inch.

Fibers crimped by heat shrinkage are, for example, fibers made of two or more resins having different melting points. Such fibers undergo three-dimensional crimping due to a difference in heat shrinkage rate when heated. The resin configuration of the thermally crimped fiber is, for example, a core-sheath structure, an eccentric type in which the core is displaced from the center of the cross-section, and a side-by-side type in which the melting points of the resins constituting one half and the other half of the cross-section are different. The heat shrinkage rate of such fibers is, for example, preferably in the range of 5 to 90%, more preferably 10 to 80%.

The measurement method of heat shrinkage rate can be, (1) make the fiber web of 200gsm (g/m ² ) with 100% measured fiber, (2) make the sample that cuts into 250 * 250mm size, (3) make the fiber web of this Place the sample in an oven at 145°C (418.15K) for 5 minutes, (4) measure the length of the sample after heat shrinkage, and (5) calculate the heat shrinkage rate based on the length difference before and after heat shrinkage.

In addition, as mentioned above, the fiber is easily rearranged by the air flow because the degree of freedom between the fibers is high, and the web before heat fusion is formed only by intertwining, in order to maintain the shape after a lot of air flow forms grooves (roughening) and the like It is preferable to use an air-through method in which thermoplastic fibers are thermally fused by oven treatment (heat treatment) to process the absorbent body. Fibers suitable for this production method are thermally fused at intersections between fibers, so it is preferable to use fibers of a core-sheath structure and a side-by-side structure, and it is more desirable to use fibers of a core-sheath structure in which the sheaths are surely easily thermally fused. In particular, it is preferable to use a core-sheath composite fiber formed of polyethylene terephthalate and polyethylene, or a core-sheath composite fiber formed of polypropylene and polyethylene. These fibers can be used alone or in combination of two or more. In addition, the fiber length is 20 to 100 mm, preferably 35 to 65 mm.

5-3. Polymer absorber

Examples of polymer absorbents that are mixed with fiber aggregates and placed in grooves, etc., include starch-based, cross-linked hydroxymethylcellulose-based, polyacrylic acid-based, and polyethanol-based polymer absorbents. . Among them, sodium polyacrylate is the best.

5-4. Fluid mainly composed of gas

The fluid mainly composed of gas in the present invention is, for example, a gas adjusted to normal temperature or a predetermined temperature, or an aerosol containing fine particles of solid or liquid in the gas.

The gas may be, for example, air, nitrogen or the like. In addition, the gas contains liquid vapor such as water vapor.

Aerosols are substances that are liquid or solid dispersed in a gas. For example, it is a color paste for coloring, or a softener such as silicon for improving flexibility, or a hydrophilic or water-repellent active agent for preventing electrification and controlling wettability, or an oxidation agent for improving fluid energy. Inorganic fillers such as titanium and barium sulfate, or powder bonding such as polyethylene that increases the energy of the fluid and improves the retention of concave-convex shape during heat treatment, or diphenhydramine hydrochloride and thymol for anti-itching. Dispersed substances such as histamines, moisturizers, or fungicides. Here, solids include colloids.

The temperature of the fluid mainly formed of gas can be adjusted appropriately. It can be appropriately adjusted according to the properties of the fibers constituting the fiber aggregate, the fiber orientation, fiber density, or fiber basis weight of the absorbent body to be produced, or the shape of the predetermined grooves and openings.

Here, in order to properly move the fibers constituting the fiber aggregate, it is desirable that the temperature of the fluid mainly composed of gas be high enough to increase the degree of freedom of the fibers constituting the fiber aggregate. In addition, when the fiber aggregate contains thermoplastic fibers, it can be formed by making the temperature of the fluid mainly composed of gas the temperature at which the thermoplastic fibers can soften, so that it can be installed on the area where the fluid mainly composed of gas is sprayed. A thermoplastic fiber that softens or melts while simultaneously hardening again.

In this way, for example, by injecting a fluid mainly composed of gas, the fiber orientation, fiber density, fiber basis weight, etc., or the shape of the groove portion and the opening portion are maintained. In addition, for example, when the fiber aggregate is moved by a predetermined moving mechanism, strength is provided to prevent the fiber aggregate (absorbent) from being scattered.

The flow rate of the fluid mainly composed of gas can be appropriately adjusted according to the adjusted fiber orientation, fiber density or fiber basis weight, or the shape of the intended groove or mouth. As a specific example of a fiber assembly having a degree of freedom between fibers, for example, the sheath is formed of high-density polyethylene, the core is formed of polyethylene terephthalate, and the fiber length is 20 to 100 mm, preferably 35 mm. to 65mm, fineness of 1.1 to 8.8dtex, preferably 2.2 to 5.6dtex core-sheath fiber and rayon, if mixed with rayon fibers selected from the same fiber length and fineness, and opened by carding, then Use fibers with a fiber length of 20 to 100 mm, preferably 35 to 65 mm, or if air-laid for opening, use fibers with a fiber length of 1 to 50 mm, preferably 3 to 20 mm, adjusted to 10 to 1000 g /m ² , preferably 15 to 100 g/m ² of the fiber web 100 . As the condition of the fluid mainly formed by gas, for example, in the ejection portion 910 forming a plurality of ejection ports 913 (the ejection ports 913: the diameter is 0.1 to 30 mm, preferably 0.5 to 5 mm, and the pitch is 0.5 to 30 mm, preferably 0.1 to 10 mm, the shape is a perfect circle, ellipse or rectangle), and the air volume is 3 to 50 [L/(min·hole)], preferably 5 to 20 [L/(min·hole)]. The net 100 sprays hot air with a temperature of 15 to 300°C (288.15K to 573.15K), preferably 100 to 200°C (373.15K to 473.15K). For example, when a fluid mainly composed of gas is sprayed under the above-mentioned conditions, a fiber assembly in which the position and direction of the fibers can be changed is one of the suitable fiber assemblies of the present invention. By using such fibers and producing under the above-mentioned production conditions, for example, the above-mentioned multilayer nonwoven fabric can be formed. The area constituting the bottom of the groove portion 1 or the size of the convex portion 2 or the fiber basis weight can be manufactured within the following ranges. The groove portion 1 has a thickness of 0.05 to 10 mm, preferably in the range of 0.1 to 5 mm, a width of 0.1 to 30 mm, preferably in the range of 0.5 to 5 mm, and a fiber weight per unit area of 2 to 900 g/m ² , preferably in the range of 10 to the range of 90g/m ² . The thickness of the convex portion 2 is 0.1 to 15mm, preferably in the range of 0.5 to 10mm, the width is 0.5 to 30mm, preferably in the range of 1.0 to 10mm, and the weight per unit area of fibers is 5 to 1000g/m ² , preferably in the range of 10 to 100 g/ ^m2 range. Here, the absorber can be produced generally within the range of the above-mentioned numerical value, but it is not limited to this range.

5-5. Manufacturing device association

5-5-1. Air permeable support member

The gas-permeable supporting member is a supporting member that allows the fluid mainly composed of gas ejected from the ejection unit 910 to pass through the fiber web 100 to the opposite side to the side where the fiber web 100 is installed.

An example of a support member that is air permeable without changing the flow of a fluid mainly composed of gas is, for example, a mesh support member 210 . The mesh supporting member 210 may be formed, for example, of a mesh member having a fine mesh formed by weaving thin metal wires. In addition, the mesh support member 210 is a mesh-shaped air-permeable support member provided with all of the first air-permeable portions described later.

In addition, the air-permeable supporting member may have an air-permeable part and a non-air-permeable part, and the air-permeable part is that the fluid mainly formed of gas sprayed from the upper side of the fiber web 100 can flow to the opposite side of the side where the fiber web 100 is provided on the air-permeable supporting member. , That is, the lower side is breathable; the non-breathable part is that the fluid mainly formed by gas sprayed from the upper side of the fiber web 100 cannot breathe to the lower side of the air-permeable support member, and the fibers 101 that constitute the fiber web 100 cannot flow to the air-permeable support member. move on the opposite side.

Such an air-permeable support member is, for example, a support member in which the members of the non-air-permeable portion are arranged in a predetermined pattern on a predetermined mesh member, or a support member in which many predetermined holes are formed on an air-impermeable plate-shaped member. .

The support member in which the air-impermeable portion is provided on the predetermined mesh member in a predetermined pattern is, for example, a support member in which elongated members 225 as air-impermeable members are arranged side by side on one side of the mesh support member 210 at equal intervals. 220. Here, a shape or arrangement of the elongated member 225 which is an air-impermeable member is appropriately changed as another embodiment. In addition to disposing the elongated member 225 on one side of the mesh support member 210, the non-air-permeable portion can also be formed by filling mesh-like meshes (for example, with solder, resin, etc.) as the air-permeable portion.

As a member in which a plurality of predetermined holes are formed in an air-impermeable plate-shaped member, there is, for example, a plate-shaped support member 230 in which a plurality of elliptical holes 233 serving as air-permeable portions are formed. Here, a member in which the shape, size, and arrangement of the hole portion 233 is appropriately adjusted can be used as another embodiment. In other words, a member in which the shape and the like of the plate portion 235 as the air-impermeable portion is appropriately adjusted can be another embodiment.

Here, the air-permeable portion on the air-permeable support member has a first air-permeable portion and a second air-permeable portion, and the fibers 101 constituting the fiber web 100 of the first air-permeable portion cannot actually flow toward the side where the fiber web 100 is placed on the air-permeable support member. The opposite side (lower side) moves; the fibers constituting the fiber web aggregate in the second air-permeable portion can move to the opposite side on the air-permeable supporting member.

The first air-permeable portion is, for example, a mesh-like region on the mesh-like support member 210 . In addition, the second air-permeable portion is, for example, the hole portion 233 on the plate-shaped support member 230 .

The air-permeable supporting member having the first air-permeable portion is, for example, the mesh supporting member 210 . An air-permeable support member having a non-air-permeable portion and a first air-permeable portion is, for example, the support member 220 . The support member having the non-air-permeable portion and the second air-permeable portion is, for example, the plate-shaped support member 230 .

In addition, for example, it is an air-permeable support member formed of a first air-permeable portion and a second air-permeable portion, or an air-permeable support member having a non-air-permeable support member and a first air-permeable portion and a second air-permeable portion. The air-permeable support member formed as the first air-permeable portion and the second air-permeable portion is, for example, an air-permeable support body in which a plurality of openings are formed in the mesh support member 210 . In addition, as the air-permeable support member having the non-air-permeable support member and the first air-permeable portion and the second air-permeable portion, for example, a plurality of openings are formed in the mesh region of the support member 220 .

In addition, the air-permeable supporting member is, for example, a support member in which the side supporting the fiber web 100 is substantially planar or substantially curved, and the planar or curved surface is substantially flat. The substantially planar shape or the substantially curved shape is, for example, a plate shape or a cylindrical shape. In addition, the substantially flat shape means, for example, that the surface itself on which the fiber web 100 is placed on the supporting member is not formed in a concave-convex shape. Specifically, for example, it is a support member in which the mesh on the mesh support member 210 is not formed in a concave-convex shape.

The air-permeable support member is, for example, a plate-shaped support member or a cylindrical support member. Specifically, for example, the above-mentioned mesh support member 210, support member 220, plate-like support member 230, air-permeable support roll, or the like.

Here, the air-permeable supporting member is detachably installed on the absorbent body manufacturing apparatus 90 . In this way, the air-permeable supporting member can be appropriately provided in accordance with the desired fiber orientation, fiber density, or fiber basis weight of the absorbent body, or the desired grooves or openings. In other words, in the nonwoven fabric manufacturing apparatus 90, the air-permeable support member can be replaced with another air-permeable support member selected from a plurality of different air-permeable support members. Furthermore, the present invention can be said to include an absorbent body manufacturing system including the absorbent body manufacturing apparatus 90 and a plurality of different air-permeable supporting members.

The mesh portion on the mesh support member 210 or the support member 220 will be described below. The air-permeable mesh part is, for example, a wire formed of resin such as polyethylene, polyphenylene sulfide, nylon, and conductive monofilament, or a wire formed of metal such as stainless steel, copper, and aluminum. Air-permeable nets woven with weaves, double weaves, spiral weaves, etc.

The air permeability of the air-permeable web can be partially changed, for example, by partially changing the weaving method, the thickness of the thread, or the shape of the thread. Specifically, the air-permeable mesh of spiral weaving made of polyester, the air-permeable mesh of helically weaving of parallel wires and round wires made of stainless steel.

In addition, instead of the elongated member 225 provided on one side of the supporting member 220, it is also possible to apply silicone resin or the like to the air-permeable mesh design, or to partially bond an air-impermeable material. For example, the silicone resin can be repeatedly applied to a plain weave 20-mesh air-permeable net made of polyester stretched in the width direction and in the flow direction of the production line. In this case, a non-air-permeable portion bonded with a silicone resin or an air-impermeable material is formed, and the other portion becomes the first air-permeable portion. In the non-air-permeable portion, the surface is preferably smooth in order to improve the sliding properties of the surface.

The plate-shaped supporting member 230 is, for example, a sleeve made of metal such as stainless steel, copper, and aluminum. The sleeve partially penetrates the metal plate in a predetermined shape, for example. The part where the metal is opened becomes the second air-permeable part, and the part where the metal is not opened becomes the non-air-permeable part. Also, as in the above, the non-air-permeable portion preferably has a smooth surface in order to improve surface slipperiness.

The sleeve is, for example, a horizontal rectangle with a length of 3mm and a width of 40mm, each corner of which is rounded. In a lattice shape, it is a stainless steel sleeve with a thickness of 0.3mm.

Furthermore, for example, it is a sleeve in which holes are provided in a zigzag shape. For example, circular metal holes with a diameter of 4 mm are arranged in a staggered shape with a pitch of 12 mm in the flow direction (moving direction) of the production line and a pitch of 6 mm in the width direction, and a stainless steel sleeve with a thickness of 0.3 mm. In this way, the pattern (formed hole portion) or arrangement to be pierced can be set on the sleeve at an appropriate time.

Furthermore, for example, an air-permeable supporting member provided with predetermined undulations is used. For example, a portion that is not directly sprayed with a fluid mainly composed of gas has an air-permeable support that alternately undulates (for example, waves) toward the flow direction (movement direction) of the production line. By using an air-permeable support member of this shape, fiber orientation, fiber density, or fiber basis weight can be adjusted, and while predetermined grooves or openings can be formed, alternating undulations (such as Waveform) shaped absorber.

Here, when the structure of the air-permeable supporting member is different, even if the gas is ejected from the ejection part 910 under the same conditions, the fiber orientation, fiber density, or fiber basis weight of the fibers 101 constituting the fiber web 100, or The shape and size of the formed grooves or openings are also completely different. In other words, by properly selecting the air-permeable supporting member, an absorbent body adjusted to a desired fiber orientation, fiber density, or fiber basis weight, or an absorbent body formed with a groove or opening of a desired shape can be obtained. body.

In addition, one of the characteristics of the absorbent body manufacturing apparatus 90 of this embodiment is that by continuously spraying fluid mainly composed of gas from the spraying mechanism to the fiber web 100 as a fiber aggregate, it is possible to manufacture fabrics with adjusted fiber orientation and fiber density. Density or fiber basis weight, or an absorbent body with defined grooves or openings formed.

5-5-2. Moving mechanism

The moving mechanism moves the fiber web 100 which is a fiber aggregate in a state supported from one side by the air-permeable supporting member described above in a predetermined direction. Specifically, the fiber web 100 in the state where the fluid mainly composed of gas is sprayed is moved in a predetermined direction F. FIG. The moving mechanism may be, for example, a conveyor 930 . The conveyor 930 has an air-permeable air-permeable conveyor belt part 939 and rotating parts 931, 933, and the air-permeable conveying belt part 939 forms a horizontally long ring of loading air-permeable supporting parts; The inner sides of the belt portion 939 are provided at both ends in the longitudinal direction, and the annular air-permeable belt portion 939 is rotated in a predetermined direction. Here, when the air-permeable support member is the mesh support member 210 or the support member 220, the above-mentioned air-permeable belt portion 939 may not be provided. When the air-permeable supporting member such as the plate-shaped supporting member 230 is a supporting body forming a large hole, in order to suppress, for example, that the fibers constituting the fiber web 100 fall from the hole and fall into the machine used in the process, it is preferable to set an air-permeable conveyor belt. Part 939. The air-permeable belt portion 939 is preferably, for example, a mesh belt portion.

As described above, the conveyor 930 moves the air-permeable supporting member in the state of supporting the fiber web 100 from the lower surface side in the predetermined direction F. As shown in FIG. Specifically, the fiber web 100 is moved to pass through the lower side of the discharge unit 910 . Then, the fiber web 100 is moved through the inside of the heater part 950 that is opened on both sides as a heating mechanism.

Also, the moving mechanism may combine a plurality of conveyors, for example. With such a configuration, the speed of moving close to the discharge part 910 and the speed of movement away from the discharge part 910 can be appropriately adjusted, so that the fiber orientation, fiber density or fiber basis weight on the absorbent body 115 can be adjusted, Or the shape of the groove or opening, etc.

Then, the absorber 115 manufactured by being heated by the heater unit 950 is moved to, for example, a process of cutting the absorber 115 into a predetermined shape or a winding process by the conveyor 930 and the conveyor 940 continuing in a predetermined direction F. Like the conveyor 930, the conveyor 940 has a belt portion 949, a turning portion 941, and the like.

5-5-3. Injection mechanism

The injection mechanism has an air supply part and a discharge part 910 which are not shown in figure. The air supply unit (not shown) is connected to the discharge unit 910 through the air supply pipe 920 . The air supply tube 920 may be air-permeably connected to the upper side of the discharge unit 910 . A plurality of discharge ports 913 are formed at predetermined intervals in the discharge unit 910 .

The gas sent from a gas supply unit (not shown) to the discharge unit 910 through the gas supply pipe 920 is discharged from a plurality of discharge ports 913 formed in the discharge unit 910 . The gas ejected from the plurality of ejection ports 913 is continuously ejected toward the upper surface side of the fiber web 100 supported from the lower surface side by the air-permeable support member. Specifically, the gas ejected from the plurality of ejection ports 913 is continuously ejected toward the upper surface side of the fiber web 100 in a state of being moved in a predetermined direction F by the conveyor 930 .

The air intake unit 915 provided below the air permeable support member below the discharge unit 910 takes in air, etc., which have been discharged from the discharge unit 910 and passed through the air permeable support member. Here, the fiber web 100 can be positioned and attached to the air-permeable supporting member by the suction of the suction unit 915 . In addition, it can be transported into the heater part 950 by air suction while maintaining the shape of the groove part (concavity and convexity) formed by the air flow. At this time, it is preferable to convey air while sucking air up to the heater part 950 while shaping the air flow.

For example, absorber 110 in which grooves 1 are formed at predetermined intervals on the upper surface of fiber web 100 is produced by mainly gaseous fluid ejected from ejection ports 913 formed at predetermined intervals in the width direction of fiber web 100 .

As the discharge part 910, for example, the diameter of the discharge port 913 is 0.1 to 30 mm, preferably 0.3 to 10 mm, and the distance between the discharge ports 913 is 0.5 to 20 mm, preferably 3 to 10 mm.

The shape of the ejection port 913 is, for example, a perfect circle, an ellipse, a square, or a rectangle, but is not limited thereto. In addition, the cross-sectional shape of the ejection port 913 is, for example, cylindrical, trapezoidal, or inverted trapezoidal, but is not limited thereto. In order to inject air to the fiber web 100 efficiently, the shape is preferably a perfect circle, and the cross-sectional shape is preferably a cylinder.

The ejection port 913 can be designed according to the fiber orientation, fiber density, or fiber basis weight required for the absorber, or predetermined grooves or openings. In addition, the hole diameters and shapes of the plurality of ejection ports 913 may be different, and multiple rows of ejection ports 913 may be formed in the ejection portion 910 .

The temperature of the fluid mainly composed of gas ejected from each ejection port 913 may be normal temperature as described above, but in order to make the formability of the groove portion (concave-convex) or opening portion good, it is preferable to adjust to at least The temperature of the thermoplastic fiber is not less than the softening point, preferably not less than the softening point and not more than the melting point + 50°C. Once the fiber is softened, the rebound force of the fiber itself is reduced, and it is easy to maintain the shape in which the air flow or the like rearranges the fibers. When the temperature is further increased, the fibers start to be thermally fused, so it is easier to maintain the shape of the groove (concave-convex) and the like. . In this way, it is easy to transport into the heater unit 950 while maintaining the shape of the groove portion (concave-convex) and the like.

In addition, in order to convey to the heater unit 950 while maintaining the shape of the grooves (concaves and convexes) etc. formed by the air flow, etc., it is possible to heat it immediately or simultaneously after forming the grooves (concave and convex) etc. by the air flow or the like. or the grooves (concavities and convexities) formed by hot air (air flow at a predetermined temperature) are formed, and immediately cooled by cold air or the like, and then transported to the heater unit 950.

Here, in addition to the above-mentioned structure of the air-permeable supporting member, as a function of moving the fibers 101 on the fiber web 100, adjusting the fiber orientation, fiber density or fiber basis weight of the fibers 101, or the grooves or openings formed. Elements such as shape and size include, for example, the velocity and flow rate of the gas ejected from the ejection unit 910 . The flow velocity or flow rate of the ejected gas can be adjusted by the air supply rate of an unillustrated air supply unit or the number or diameter of the discharge ports 913 formed in the discharge unit 910 .

In addition, by allowing the ejection unit 910 to change the direction of the fluid mainly composed of gas, for example, the interval between the grooves 1 (grooves) on the formed unevenness or the height of the convexity can be adjusted appropriately. Furthermore, by adopting a structure capable of automatically changing the direction of the above-mentioned fluid, for example, the groove portion and the like can be appropriately adjusted to meandering (wave, zigzag) or other shapes. In addition, by adjusting the ejection amount or ejection time of the fluid mainly composed of gas, the shape or pattern of the groove or opening can be appropriately adjusted. The injection angle of the fluid mainly formed by gas relative to the fiber web 100 may be vertical, and, in the moving direction F of the fiber web 100, may be directed at a predetermined angle toward the flow direction of the production line as the moving direction F, or may be at a predetermined angle In the opposite direction to the flow direction of the production line.

5-5-4. Heating mechanism

The heater unit 950 as a heating mechanism has openings at both ends when viewed in a predetermined direction F. As shown in FIG. In this way, the fiber web 100 (multilayer nonwoven fabric 110 ) loaded on the air-permeable support member moved by the conveyor 930 is transported to the heating space formed inside the heater part 950 , stays for a predetermined time, and then is transported to the outside. In addition, when the fibers 101 constituting the fiber web 100 (multilayer nonwoven fabric 110) contain thermoplastic fibers, the fibers are melted by the heating of the heater unit 950, and the fibers are transported to the outside for cooling, so that the inter-fiber gap between the fibers can be obtained. Multi-layer non-woven fabric after mutual intersection point melting.

Fiber 101 on the multilayer nonwoven fabric 110 that adjusts fiber orientation, fiber density or fiber basis weight and/or forms one or more of the prescribed grooves, openings or protrusions as bonding, 102 methods, for example, there are needle punching method, spunlace method, bonding by solvent bonding method, or thermal bonding by point bonding method or air penetration method. Furthermore, in order to bond fibers to each other while maintaining the adjusted fiber orientation, fiber density, or fiber basis weight, or the shape of formed grooves, openings, or protrusions, the air-through method is preferable. In addition, heat treatment using, for example, the air-through method of the heater unit 950 is preferable.

Claims (22)

1. an absorber contains hygroscopicity fibre, it is characterized in that, has a plurality of low fiber weight per unit area zones and a plurality of high fiber weight per unit areas zone,

Described low fiber weight per unit area zone forms continuously along first direction, and the fiber weight per unit area is lower than the average fiber weight per unit area of this absorber,

Described high fiber weight per unit area zone with the second direction of described first direction quadrature on be formed on the both sides in described low fiber weight per unit area zone, form along this low fiber weight per unit area zone, and the fiber weight per unit area is higher than described average fiber weight per unit area;

The containing ratio of contained vertical directional fiber is higher than the containing ratio of horizontal directional fiber in the fiber in this high fiber weight per unit area zone of formation separately, described a plurality of high fiber weight per unit area zones,

The containing ratio of contained described horizontal directional fiber is higher than the containing ratio of described vertical directional fiber in the fiber in this low fiber weight per unit area zone of formation separately, described a plurality of low fiber weight per unit area zones.

2. absorber as claimed in claim 1, it is characterized in that all or part of of described a plurality of high fiber weight per unit areas zone is outstanding and as the thickness of the length on the described thickness direction convex shaped part thicker than the average thickness of this absorber to the thickness direction of this absorber;

All or part of of described a plurality of low fiber weight per unit areas zone is to be to the shape of described thickness direction depression and the slot part of described thin thickness.

3. absorber as claimed in claim 1 or 2 is characterized in that, in described low fiber weight per unit area zone, forms any one the fiber small number of regions at least that comprises in a plurality of depressed parts, a plurality of peristome.

4. absorber as claimed in claim 3, it is characterized in that, as the described thickness in the zone, side of the both sides zone, side, that be arranged on described fiber small number of regions in described high fiber weight per unit area zone, than the described thin thickness in the zone in the zone, non-described side in the described high fiber weight per unit area zone.

5. as each described absorber in the claim 1 to 4, it is characterized in that also having the macromolecule absorber.

6. absorber as claimed in claim 5 is characterized in that, described macromolecule absorber bias configuration is in the opposing face side of the face that is formed with described low fiber weight per unit area zone and described high fiber weight per unit area zone.

7. as claim 5 or 6 described absorbers, it is characterized in that described macromolecule absorber is configured in described low fiber weight per unit area zone.

8. absorber, it is characterized in that, lamination disposes as first absorber of each described absorber in the claim 1 to 7 with as second absorber of each described absorber in the claim 5 to 7, makes that mutual to be formed with described low fiber weight per unit area zone relative with the face in described high fiber weight per unit area zone.

9. a multilayer absorber has the absorber that first fibrage and lamination are configured in the described first fibrolaminar one side side and have hygroscopicity fibre, it is characterized in that,

Be formed with a plurality of slot parts and a plurality of convex shaped part, described a plurality of slot part sees that from the described first fibrolaminar another side shape ground that is in the thickness direction of this multilayer absorber depression forms along first direction, described a plurality of convex shaped part is to the outstanding shape of described thickness direction, form in abutting connection with ground with described a plurality of slot parts from seeing respectively with the second direction of described first direction quadrature, and its fiber weight per unit area is higher than the zone of the bottom that constitutes described slot part;

From described thickness direction, constitute described a plurality of slot parts the bottom the zone and described a plurality of convex shaped part respectively lamination dispose described first fibrage and described absorber;

The shape that constitutes the described absorber of described a plurality of convex shaped parts is that the same side that faces a side of giving prominence to the described first fibrolaminar described another side of the described first fibrage side of this absorber is outstanding.

10. multilayer absorber as claimed in claim 9 is characterized in that, the containing ratio of the vertical directional fiber of the fiber of described a plurality of convex shaped parts this convex shaped part of formation separately is higher than the containing ratio of horizontal directional fiber;

The containing ratio of the described horizontal directional fiber of the fiber of described a plurality of slot part these a plurality of slot parts of formation separately is higher than the containing ratio of described vertical directional fiber.

11. as claim 9 or 10 described multilayer absorbers, it is characterized in that, zone in the bottom that constitutes described a plurality of slot parts, the direction in the extension of this slot part is formed with any one the fiber small number of regions at least that comprises a plurality of depressed parts, a plurality of peristomes with predetermined distance respectively;

All or part of of side wall portion of periphery that constitutes described fiber small number of regions is by constituting the described first fibrolaminar fiber-covered.

12., it is characterized in that also having second fibrage on the face of the described first fibrage opposition side that is configured in described absorber as each described multilayer absorber in the claim 9 to 11.

13. multilayer absorber as claimed in claim 12 is characterized in that, described first fibrage and described second fibrage form by the combing method lamination;

Described absorber forms the fiber lamination that constitutes this absorber by utilizing the air lay method on the face of described first fibrolaminar side's side.

14. absorbent commodity, has the liquid non-permeable film that first fibrage, lamination are configured in the described first fibrolaminar one side side and comprise the absorber of hygroscopicity fibre and be configured in the described first fibrage opposition side of described absorber, it is characterized in that

Be formed with a plurality of slot parts and a plurality of convex shaped part, described a plurality of slot part is seen to be in the shape of the thickness direction of this multilayer absorber depression and along first direction from the described first fibrolaminar another side and is formed, described a plurality of convex shaped part is to the outstanding shape of described thickness direction, abut to form with described a plurality of slot parts from seeing respectively, and its fiber weight per unit area is higher than the zone of the bottom that constitutes described slot part with the second direction of described first direction quadrature;

Described a plurality of slot part and described a plurality of convex shaped part are formed by described first fibrage and described absorber;

The shape that constitutes the described absorber of described a plurality of convex shaped parts is that the same side that faces a side of giving prominence to described first fibrolaminar described the opposing party of the described first fibrage side of this absorber is outstanding.

15. absorbent commodity as claimed in claim 14 is characterized in that, the containing ratio of the vertical directional fiber of the fiber of described a plurality of convex shaped parts this convex shaped part of formation separately is higher than the containing ratio of horizontal directional fiber;

The containing ratio of the described horizontal directional fiber of the fiber of described a plurality of slot part these a plurality of slot parts of formation separately is higher than the containing ratio of described vertical directional fiber.

16. as claim 14 or 15 described absorbent commodities, it is characterized in that,, be formed with any one the fiber small number of regions at least that comprises a plurality of depressed parts, a plurality of peristomes with predetermined distance respectively at described a plurality of slot parts;

All or part of of side wall portion that constitutes described fiber small number of regions periphery is by constituting the described first fibrolaminar fiber-covered.

17., it is characterized in that also having second fibrage that is arranged between described absorber and the described liquid non-permeable film as each described absorbent commodity in the claim 14 to 16.

18. the manufacture method of an absorber is characterized in that, has supporting operation, mobile process and jeting process,

In described supporting operation, by being placed on the predetermined surface of gas permeability support unit with fiber assembly as the absorber that the fiber fiber assembly that contains hygroscopicity fibre that forms sheet, that be in this fiber assembly of formation has the state of the free degree, use a side bearing of fiber assembly on described gas permeability support unit from described absorber

In described mobile process, by the travel mechanism that stipulates the described absorber that is supported by described gas permeability support unit is moved to first direction with fiber assembly,

In described jeting process, by the fluid of injection equipment from described mobile process, being used the another side side injection of fiber assembly mainly to form of regulation by gas by the described absorber that moves to described first direction.

19. the manufacture method of a multilayer absorber is characterized in that, has supporting operation, mobile process and jeting process,

In described supporting operation, to have first fiber assembly and absorber is placed on the predetermined surface of gas permeability support unit with the multi-layer fiber aggregate of fiber assembly, perhaps, the fiber lamination that will contain hygroscopicity fibre on described predetermined surface to form this absorber fiber assembly, and lamination disposes described first fibrage and forms described multi-layer fiber aggregate, thus, from the one side side of described multi-layer fiber aggregate this multi-layer fiber aggregate is bearing on the described gas permeability support unit, wherein, described first fiber assembly is to form the fiber assembly of sheet and be in the state that the fiber that constitutes this fiber assembly has the free degree, and described absorber fiber assembly is forming sheet and comprising the fiber assembly of hygroscopicity fibre and be in the state that the fiber of this fiber assembly of formation has the free degree of the lamination one side side that is configured in described first fiber assembly;

In described mobile process, the described multi-layer fiber aggregate that is supported by described gas permeability support unit is moved to first direction by the travel mechanism that stipulates;

In described jeting process, by the fluid of injection equipment from described mobile process, mainly being formed of regulation by gas by the injection of the another side side of the described multi-layer fiber aggregate that moves to described first direction.

20. the manufacture method of a multilayer absorber is characterized in that, has supporting operation, mobile process and jeting process,

In described supporting operation, to have first fiber assembly, absorber is configured on the predetermined surface of gas permeability support unit with the multi-layer fiber aggregate of the fiber assembly and second fiber assembly, thus, from the one side side of described multi-layer fiber aggregate this multi-layer fiber aggregate is bearing on the described gas permeability support unit, wherein, described first fiber assembly is to form the fiber assembly of sheet and be in the state that the fiber that constitutes this fiber assembly has the free degree, described absorber fiber assembly is forming sheet and comprising the fiber assembly of hygroscopicity fibre and be in the state that the fiber that constitutes this fiber assembly has the free degree of the lamination one side side that is configured in described first fiber assembly, and described second fiber assembly is to be configured in described absorber with the fiber assembly that forms sheet roughly of the described first fibrolaminar opposition side of fiber assembly and be in the state that the fiber of this fiber assembly of formation has the free degree;

In described mobile process, the described multi-layer fiber aggregate that is supported by described gas permeability support unit is moved to first direction by the travel mechanism that stipulates;

In described jeting process, by the fluid of injection equipment from described mobile process, mainly being formed of regulation by gas by the injection of the another side side of the described multi-layer fiber aggregate that moves to described first direction.

21. the manufacture method of multilayer absorber as claimed in claim 20 is characterized in that, comprises following operation in described supporting operation:

Described second fiber assembly is configured on the described predetermined surface of described gas permeability support unit,

By will constitute described absorber with the fiber lamination that contains described hygroscopicity fibre of fiber assembly on the face of the opposition side of the described gas permeability support unit side of described second fiber assembly, form described absorber fiber assembly,

The described first fiber assembly lamination is configured in the opposition side of above-mentioned formed described absorber with the described second fiber collection side of fiber assembly, forms described multi-layer fiber aggregate.

22. the manufacture method of multilayer absorber as claimed in claim 21 is characterized in that, described absorber forms by the air lay method with fiber assembly.

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