JPH1066710A - Absorbent articles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively prevent leak at a groin section by folding the flaps extended outward from both side edges in the lateral direction of an absorber onto the absorber to form a pair of three-dimensional gathers, and curving and arranging the erect lines of the three-dimensional gathers to the outside of an absorbing article at the groin portion of the absorbing article. SOLUTION: An absorber 3 is arranged between a liquid-permeable surface sheet 1 and a liquid-nonpermeable back sheet 2, and three-dimensional gathers 4 are arranged at both side sections of the absorber 3 to form this absorbing article. Elastic bodies 5 arranged at the free edges 6 of the three-dimensional gathers 4 are arranged in parallel with the center line 7 in the longitudinal direction of an expendable diaper, erect lines 8 of the three-dimensional gathers 4 are curved outward at a groin portion B, and the weirs 9 of the three- dimensional gathers 4 at the groin portion B practically become high. When the erect lines 8 of the three-dimensional gathers 4 at the groin portion B are provided on the outside of the absorber 3, the distance between the outermost curve portions of the erect lines 8 and the side edges of the absorber 3 is preferably set to 1-250mm on the surface sheet 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to absorbent articles such as diapers, pads, sanitary napkins and the like for infants or incontinent persons. More specifically, the present invention relates to an absorbent article which is conveniently used by simply increasing the height of the three-dimensional gathers only in the crotch portion to prevent leakage of the crotch portion and to easily raise the entire three-dimensional gather.

[0002]

2. Description of the Related Art A disposable diaper, which is one of known absorbent articles, comprises a cotton-like pulp and a superabsorbent polymer (hereinafter referred to as SAP) between a liquid-permeable top sheet and a liquid-impermeable back sheet. ), An absorbent body made of a hydrophilic sheet or the like is arranged, and urine is absorbed by the absorbent body through the topsheet. In recent years, disposable diapers have become thinner and more compact from the perspective of ease of use and reduction of distribution costs.
As a result, there is a tendency to reduce the use ratio of the large-volume cotton-like pulp used in the absorber and increase the ratio of the SAP having a small volume and a large absorption capacity. However, SAP has a low rate of absorbing urine and body fluid,
A disposable diaper composed of a thin absorber having a high P content has a speed at which urine and body fluid are absorbed from the topsheet (hereinafter, referred to as “absorbent”).
This causes a problem that urine and body fluid leak out of the disposable diaper.

[0003] In order to solve the problem of leakage due to a decrease in the absorption rate of the thin absorbent, it has become common to arrange three-dimensional gathers along the side of the absorbent article. The conventional three-dimensional gather is formed such that a flap including an elastic body arranged in parallel to the longitudinal direction of the absorbent article rises on an upright line arranged in parallel. Both ends in the longitudinal direction of the three-dimensional gathers are fixed inside an erect line (JP-A-62-250201), and fixed outside the erect line (JP-A-62-223303). Fixed to the outside.
Publication No.) is adopted. In any of these methods, the height of the weir of the three-dimensional gather is substantially constant because the elastic body and the erect line are arranged in parallel along the longitudinal direction of the absorbent article. In order to provide a sufficient height, it is necessary to increase the height of the entire weir.

[0004] The rise at each part of the three-dimensional gather,
The width of the weir of the three-dimensional gather, the distance between the rising line of the three-dimensional gather and the line connecting the two fixed parts of the free edge, the strength of the elastic body at the free edge of the three-dimensional gather (gather strength), and both ends in the longitudinal direction of the three-dimensional gather Depends on the distance of the part from the fixed area. Since the three-dimensional gathers at the crotch are separated from the fixed areas at both ends of the free edge, if the gather strength is moderate, the three-dimensional gathers are likely to stand on the upright line regardless of the width of the three-dimensional gathers and the orientation of fixing the two ends of the free edge. However, the three-dimensional gathers on the back side and the abdominal part close to the fixed area of the free edge are difficult to rise from the state of falling in the fixed direction when the width of the weir of the three-dimensional gathers is large. In other words, in the conventional method of fixing both ends of the three-dimensional gather, in the back side and the abdomen part near the fixing area of the free edge both ends, the weir of the back part is sufficient to make the height of the crotch part sufficient. When the width is increased, the distance between the free edge and the erect line becomes large, so that there is a problem that the three-dimensional gather itself is harder to rise than on the erect line.

On the other hand, in a method in which both ends of the three-dimensional gather are not fixed, both ends of the three-dimensional gather are formed on the back and the abdomen,
Depending on the wearing condition of the wearer, there is a problem that the solid gathers are worn in a bent state, and the three-dimensional gathers do not rise sufficiently, or the bent part of the three-dimensional gathers hits the wearer, resulting in a poor fit.

As a method of shortening the distance between the rising line of the three-dimensional gather and the line connecting the two fixed portions of the elastic body at the free edge to make the three-dimensional gather easily rise on the rising line, the width of the weir of the three-dimensional gather is made constant. Then, both ends in the longitudinal direction of the three-dimensional gather are bent and fixed in a C-shape (Japanese Patent Laid-Open No.
No. 9967), a method of changing the standing line of a three-dimensional gather (Japanese Patent Application Laid-Open Nos. Hei 4-200543 and Hei 5-92).
No. 023).

In the former method, a weir forming a three-dimensional gather is folded into a C-shape at both ends in the longitudinal direction with respect to an erect line of the three-dimensional gather disposed along the longitudinal direction of the absorbent article.
The solid gather free edge is fixed. In order to bend and fix both ends of the three-dimensional gather in a C-shape, even when the three-dimensional gather weir at the crotch is raised, the position of the upright line and the free edge of the three-dimensional gather is more than just fixing by inward or outward fall Because it is too close, three-dimensional gathers tend to rise on the erect line. In the latter method, in the crotch, the distance between the rising line of the three-dimensional gather and the line connecting the fixed area of the free edge is simply fixed by inward or outward disposition arranged in parallel to the longitudinal direction of the absorbent article. 3D gather is easy to stand on the erect line because it is closer than.

However, the weirs forming the three-dimensional gathers are hard to spread at both ends, which are the fixed areas of the free edges of the three-dimensional gathers, that is, the back side and the abdominal side, because the weirs forming the three-dimensional gathers are close to the fixed areas. However, there was a problem that weirs could not be formed by sufficient rising. In the latter method, since the width of the weir of the three-dimensional gather is constant and the elastic body is fixed to the edge of the weir, the elastic body is formed into a three-dimensional gather in a curved shape like an upright line. In order to manufacture an absorbent article, it was not satisfactory in terms of high-speed production, and trouble often occurred. Further, in each case, not only the three-dimensional gathers at the crotch part, which is important for lateral leakage, but also the three-dimensional gathers with the height of the entire weir constant, the material used increases, and the manufacturing cost increases. There was also the problem of becoming expensive.

On the other hand, a method of changing the height of a weir of a three-dimensional gather is also known (JP-A-3-286760). In this method, a sheet in which an elastic body is joined along the longitudinal direction of the absorbent article is arranged, and both ends of the sheet are joined and fixed to a top sheet of the absorbent article by flat portions, and the central region of the sheet is A three-dimensional gather is formed by forming a weir in a form in which the sheets are joined to face each other with the elastic body interposed therebetween, and standing upright, and being fixedly joined to the surface sheet of the absorbent article at a flat portion forming the base of the upright portion. Are arranged parallel to the longitudinal direction of the absorbent article, and the height of the weirs of the three-dimensional gathers changes so as to be higher in the central region, and stands upright on the rising line.

[0010] In this method, it is possible to increase only the height of the crotch weir, but since the three-dimensional gather is formed of two layers of sheets, the three-dimensional gather sheet becomes thick and the rigidity increases. In addition, since the elastic body of the three-dimensional gathers can be arranged only at the free end of the weir, there is a problem that the gather strength cannot be sufficiently adjusted and the ability to follow around the legs is low. There is a possibility that a gap may be formed between the diaper and the diaper, and leakage cannot be sufficiently prevented.

There is also known a method in which a plurality of base ends forming the rising line of the three-dimensional gather are arranged in parallel to substantially change the height of the weir of the three-dimensional gather and change the rising line ( Japanese Patent Publication No. 7-67476). In this method, the rising lines of the three-dimensional gathers are formed by two solid gather sheets that are not connected to each other and are formed parallel to the longitudinal center line of the absorbent article. Since the seal line forming the rising line of the three-dimensional gather is formed of two or more unconnected lines, the followability of the three-dimensional gather to the wearer is reduced. In addition, there is a problem that the excrement of the wearer flows into a gap that is a discontinuous portion of the seal wire, and exudes from the side portion without being absorbed and leaks.

[0012]

In view of such circumstances, the present inventors have developed an absorbent article having an absorbent between a liquid-permeable top sheet and a liquid-impermeable back sheet.
While the free edge of the three-dimensional gather is provided in the longitudinal direction of the absorbent article, the rising line of the three-dimensional gather is continuously curved to the outside of the absorber at the crotch portion, so that the weir at the crotch can be easily and substantially formed. It was concluded that it was possible to make the height of the three-dimensional gathers of not only the crotch but also the entire absorbent article stand easily.

[0013] In addition, the rising lines of the three-dimensional gathers are bent outside the absorber at the crotch portion, and both ends in the longitudinal direction are folded back to the outside of the rising lines to fix the rising lines of the three-dimensional gather at least at the crotch portion. Since the distance between the free edge and the line connecting the two fixed parts is smaller than the width of the weir of the three-dimensional gather, the three-dimensional gather is easy to rise on the rising line, which is effective against leakage at the crotch I came to the conclusion. In addition, the weir of the three-dimensional gather can be freely selected as a single layer or a multi-layer, an elastic body is provided at a free edge, and the position and the number of the elastic body are selected, so that the three-dimensional gather with high followability to the circumference of the wearer's leg is provided. Can be formed.

[0014] An object of the present invention is to conveniently use the three-dimensional gathers only at the crotch to prevent the leakage of the crotch and to make the whole three-dimensional gathers easily stand up. To provide an absorbent article.

[0015]

According to the present invention, there is provided a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber disposed between the two sheets, and a longitudinal side edge. In the absorbent article having a pair of three-dimensional gathers provided, the three-dimensional gathers are formed by folding a flap extending outward from both lateral edges of the absorber outward on the absorber, and The upright line of the three-dimensional gather is curvedly disposed outside the absorbent article at the crotch part of the absorbent article, so that the three-dimensional gather weir at the crotch part is substantially present in the absorbent article. Furthermore, the three-dimensional gather of the present invention resides in an absorbent article characterized in that both ends in the longitudinal direction are folded back to the outside of the standing line and fixed.

In the absorbent article according to the present invention having the above-described structure, the height of the three-dimensional gathers only at the crotch portion can be easily increased to prevent leakage at the crotch portion, and the entire three-dimensional gathers can be easily raised. In addition, it is possible to provide an inexpensive absorbent article that uses less material. In addition, the standing line of the three-dimensional gather is continuously curved outward at the inseam,
By folding and fixing both ends in the longitudinal direction to the outside of the standing line, the three-dimensional gathers can be easily raised on the standing line, and the leakproofness can be further enhanced. In addition, the weir of the three-dimensional gather can be freely selected as a single layer or a multi-layer, an elastic body is provided at a free edge, and the position and the number of the elastic body are selected, so that the three-dimensional gather with high followability to the circumference of the wearer's leg is provided. To provide a comfortable absorbent article with high leakproofness.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The topsheet used in the present invention is a hydrophilic or hydrophobic nonwoven fabric, woven fabric, porous plastic film, or the like, and its constituent fibers are polypropylene, polyethylene, polyester, nylon or nylon. Composite fibers composed of two or more components such as polyester, polypropylene, polyethylene and nylon may be used. In particular, polyester / polyester, polyester / polyethylene, and polypropylene / polyethylene composite fibers are preferred from the viewpoint of strength, but are particularly limited. is not.

The top sheet need not be constituted by a single sheet, but may be constituted by a plurality of sheets, for example, by changing the sheet between the upper surface of the absorber and the side flaps. When the top sheet is composed of a plurality of sheets, each sheet may be made of a different material, or may be made of the same material.

The back sheet used in the present invention comprises:
It is composed of a liquid impermeable film such as polyethylene, a material in which the liquid impermeable film is bonded to a nonwoven fabric, a woven fabric, or the like.

The absorbent used in the present invention is made of cottony pulp, SAP, hydrophilic sheet, etc., and is not particularly limited. The absorbent used in the present invention is made from known absorbent materials commonly used in conventional disposable diapers and other absorbent articles. That is, it is formed from a single-layer or multi-layer mat made of absorbent fibers such as cotton-like pulp and rayon, and further wrapped by a hydrophilic sheet, and SAP is uniformly mixed in each mat or between each mat. They are arranged in layers. In addition, the absorbent in which SAP is uniformly mixed may be subjected to thermocompression bonding after mixing 3 to 60% by weight of the heat-fusible substance with respect to the cotton-like pulp, or only the SAP is a hydrophilic sheet. May be wrapped by

As the cotton-like pulp, chemical pulp sheet,
It has a fiber length of 5 mm or less obtained by defibrating a waste paper pulp sheet or a mechanical pulp sheet with a crusher.
Pulp materials are not limited to conifers, but include hardwoods, straws,
Bamboo and kenaf also apply. The amount of this pulp used is
Depending on the intended absorber, for example, it may vary depending on whether it is used alone, a plurality of layers are used, or another absorbent is used in combination, but it is generally 50 to 400 g / m ² .

Examples of the SAP include starch, cellulose, and synthetic polymer. That is, a starch-acrylic acid (salt) graft copolymer, a saponified product of starch-ethyl acrylate graft copolymer, a saponified product of starch-methyl methacrylate graft copolymer, and a saponified product of starch-acrylonitrile graft copolymer , A saponified starch-acrylamide graft copolymer,
Starch-acrylonitrile 2-acrylamide-2
-Methylpropanesulfonic acid graft copolymer saponified product, acrylic acid (salt) polymer, polyethylene oxide cross-linked with acrylic acid, cross-linked product of sodium carboxymethyl cellulose, cross-linked product of polyvinyl alcohol-maleic anhydride reactant And so on.

A substance which absorbs urine, body fluid and water at least 20 times its own weight, and a sodium polyacrylate type is most suitable in terms of absorption performance. The SAP is distributed in an amount of 10 to 500 parts by weight, preferably 15 to 300 parts by weight, based on 100 parts by weight of the dried cotton-like pulp, and such an amount of the SAP is substantially uniformly distributed in the cotton-like pulp. I have. S
When the AP absorbs and swells, the particles have minimal interference with each other, are less likely to form continuous permeation barriers, and penetrate and absorb urine and bodily fluids in three dimensions.

The hydrophilic sheet may be any hydrophilic sheet such as a tissue, an absorbent paper, a hydrophilic nonwoven fabric, or the like. As a method of compressing the absorber, the surface of the absorber may be a continuous surface shape such as a roll having a smooth peripheral surface so that the density of the absorber is substantially uniform over the entire surface, or the peripheral surface may be uneven. The density of the absorber may be partially different depending on the roll or the like, and the embossment may have a pattern arrangement for guiding urine or bodily fluid in the vertical direction and the oblique direction. In the case of embossing, the compression section and the non-compression section may be continuous or discontinuous. The shape of the absorber can be freely selected from a rectangular shape, an hourglass shape, and a T-shape, and may be any of known shapes commonly used for conventional disposable diapers and other absorbent articles, and is particularly limited. Not something.

Further, a diffusion layer may be provided on at least a part of the absorber. By providing the diffusion layer, even when the space under the topsheet is not sufficiently provided due to the posture of the wearer, without reducing the urine, absorption speed of body fluids, etc.
It is possible to prevent leakage of urine, body fluid, and the like. The diffusion layer
Hydrophilic liquid permeable non-woven fabric, woven fabric, porous plastic,
Cottony pulp, etc., the constituents of which are polypropylene,
Polyethylene, polyester, rayon, pulp, or a composite fiber thereof may be used, and there is no particular limitation. The diffusion layer is provided between the topsheet and the absorber, and is fixed to the absorber with an adhesive or the like.

The three-dimensional gathers are formed by folding a flap extending outward from both side edges of the absorber onto the absorber. The flap may be formed of a top sheet, but may be a separate member, or may be a top sheet, a back sheet, or a laminated member. The material of the three-dimensional gather sheet is a hydrophilic or hydrophobic nonwoven fabric, a woven fabric, a porous plastic film, or a liquid-impermeable film, or a laminate of these materials. The constituent fibers of the woven fabric and the nonwoven fabric are polypropylene. , Polyethylene, polyester, nylon or polyester, polypropylene,
Composite fibers composed of two or more components such as polyethylene and nylon may be used. In particular, polyester / polyester,
Polyester / polyethylene and polypropylene / polyethylene composite fibers are preferred in terms of strength, but are not particularly limited. It is not necessary to have air permeability or liquid permeability, but preferably, it has air permeability.

Further, an elastic member may be provided on the three-dimensional gather sheet according to the purpose of use. When the elastic member is provided, the fit of the wearer also increases, and the followability to the movement of the wearer also increases. As the elastic member, a thread-like, string-like, or flat-shaped material such as natural rubber, synthetic rubber, or urethane is used depending on the installation position. The disposition of the elastic member is fixed to the sheet by an adhesive. Hot melt,
Water-soluble glue such as starch-based or CMC (carboxymethylcellulose), a highly fluid adhesive, or welding by heat or ultrasonic waves may be used.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the absorbent article of the present invention will be described in detail with reference to the drawings, taking an absorbent article having a pad structure as an example.
The present invention is not limited to these. FIG. 1 is a partially cut-away development plan view of an absorbent article. In FIG. 1, the absorbent article is a liquid-permeable topsheet 1
The absorber 3 is arranged between the liquid-impermeable backsheet 2 and the liquid-impermeable backsheet 2. Further, three-dimensional gathers 4 are provided on both sides of the absorber 3. The three-dimensional gather is disposed on the free edge 6 of the elastic body 5 in an extended state. The elastic body 5 of the three-dimensional gather is arranged parallel to the longitudinal center line 7 of the disposable diaper, but the upright line 8 of the three-dimensional gather is curved outward at the crotch portion B, and substantially corresponds to the crotch portion B. The three-dimensional gather weir 9 (see FIG. 2) is raised.

In FIG. 1, the three-dimensional gathers 4 are arranged in a pair along the side edge of the absorber 3 over the entire surface in the longitudinal direction. Is also good. In addition, the standing line 8 of the three-dimensional gather is shown in FIG.
The crotch part B is outside the absorber 3, but the back part A and the abdominal part C need not be outside the absorber 3, may be above the absorber 3, and may be distributed over both. It may be installed. When the upright line 8 of the three-dimensional gather at the crotch B is provided outside the absorber 3, the outer edge of the upright line 8 that is curved to the side edge of the absorber 3 (when the absorber is an hourglass type, , The distance from the side edge of the narrowest part)
It is preferable to provide it on the topsheet 1 on the absorber 3 at a position of 250 mm. When the distance between the upright line 8 and the side edge of the absorber 3 is more than 1 mm, the height of the weir 9 of the three-dimensional gather at the crotch B becomes difficult to increase, and the absorption region of the absorber becomes narrower, so that the absorption performance is reduced. It is not preferable because it decreases. Further, in FIG. 1, the change of the rising line 8 of the three-dimensional gather is symmetrical in the first half (abdominal side) and the second half (dorsal side), but is not necessarily required to be symmetrical.

In FIG. 1, the free edge 6 of the three-dimensional gather is not fixed at both ends in the longitudinal direction, but may be partially fixed and is not particularly limited. Also, when being fixed, it may be inside or outside the upright line 8 or on the upright line 8. Also, a method of fixing only one, or a method of fixing one inside and the other outside may be used.

The height of the weir 9 of the three-dimensional gather is 10 mm or more and 100 mm or less, preferably 20 mm or more and 60 mm or less at the crotch part B. On the other hand, the height of the weir 9 of the three-dimensional gather at the back part A and the abdominal part C is 0.
mm to 80 mm, preferably 0 to 50.
mm or less. However, the height of the weir 9 of the back part A and the abdominal part C is formed lower than the weir 9 of the crotch part B,
The difference is 5 mm or more and 100 mm or less, preferably 10 mm or more and 50 mm or less.

In FIG. 1, one elastic body 5 of the three-dimensional gather is provided on the side of the free edge 6 of the three-dimensional gather.
It is sufficient that the elastic member 5 is disposed on the side portion of the free edge 6 or on the vicinity thereof, and only one elastic body 5 may be disposed on each three-dimensional gather 4, or a plurality of elastic members 5 may be disposed. There is no particular limitation.

FIG. 2 is a perspective view of the absorbent article of FIG. In FIG. 2, a three-dimensional gather 4 is provided on the side of the absorber 3 of the absorbent article, and an upright line 8 of the three-dimensional gather is provided.
Is curved outward at the crotch part, and the weir 9 of the three-dimensional gather substantially at the crotch part is raised.

FIG. 3 is an exploded plan view showing another embodiment different from FIG. 1 in which the side of the free edge 6 of the three-dimensional gather is turned outward and both ends in the longitudinal direction are fixed outside the rising lines 8. is there.
In FIG. 3, in the crotch B, a line 15 connecting the upright line 8 of the three-dimensional gather and the fixed portions of the elastic body 5 at the free edge 6.
The distance L ₁ is shorter than the width L ₂ of the weir standing gathers 4, line 15 that connects the two fixed portions of the elastic member 5 of the free edge 6 becomes closer to upright line 8 and, standing gathers 4 Is easily raised on the rising line 8. When the free edge 6 of the three-dimensional gather is folded outward and fixed, the width of the folded free edge 6 is 3 mm or more and 80 mm or less, preferably 5 mm or more and 50 mm or less.

FIG. 4 shows another embodiment different from FIGS. 1 and 3, in which the side of the free edge 6 of the three-dimensional gather is further tilted outward, and both ends in the longitudinal direction are fixed outside the standing line 8. FIG. In FIG. 4, a line 15 connecting the upright line 8 of the three-dimensional gather and both fixing portions of the elastic body 5 at the free edge 6 partially crosses. In the portion where the rising line 8 of the three-dimensional gather is inside the line 15 connecting the two fixed portions of the elastic body 5 of the free edge 6, the three-dimensional gather 4 is more likely to fall outside the rising line 8 and the three-dimensional gather 4 In a portion where the rising line 8 is on the line 15 connecting the two fixed portions of the elastic body 5 of the free edge 6, the three-dimensional gathers 4 are easily raised on the rising line 8, and the three-dimensional gathers rise up on the free edge 6. In a portion outside the line 15 connecting the two fixing portions of the elastic body 5, the three-dimensional gather is more likely to fall inward than the rising line 8.

When the free edge 6 of the three-dimensional gather is fixed by being tilted outside the rising line 8, all the lines 15 connecting both fixing portions of the elastic body 5 of the free edge are located inside the rising line 8. It may be fixed, but so that it is partly on the rising line 8,
Alternatively, a portion may be fixed to the outside, or all may be fixed to the outside. Standing line 8
The distance between the solid gather and the fixing portion 14 of the solid gather does not need to be the same as the width of the weir 9 of the solid gather, and may be smaller than the width of the weir 9 of the solid gather.

The change of the standing line 8 of the three-dimensional gathers is asymmetrical in the first half (ventral side) and the second half (dorsal side), and the width of the weir 9 of the three-dimensional gathers in the back side A and the ventral side C is reduced. If they are different, the upright lines 8 and the fixing portions 14 at the ends of the free edges 6 are respectively provided.
May be different. However, preferably, in the crotch portion, the distance L ₁ between the line 15 that connects the two fixed portions of the elastic member 5 of the free edge 6 standing line 8, 0 mm or more 15mm
From the following, it is preferable that the three-dimensional gathers 4 rise on the rising lines 8 in order to prevent leakage at the crotch portion. In this way, by adjusting the degree of change of the standing line 8 of the three-dimensional gather and the fixing part 14 at the end of the free edge 6 of the three-dimensional gather, the height of the weir 9 of the three-dimensional gather and the rising of the rising can be easily obtained. It is possible to adjust the direction depending on the position of the absorbent article.

FIG. 5 is a cross-sectional view of the pad structure absorbent article of FIG. 4 in a state where the three-dimensional gather elastic body 5 is free. 5, (A) is a cross-sectional view taken along the line II 'of FIG. 4, (B) is a cross-sectional view taken along the line II-II', and (C) is a cross-sectional view taken along the line III-III '.
It is a line sectional view. In (A), since the II ′ line portion is close to the free edge fixing area 14 at the longitudinal end of the three-dimensional gather, the weir of the three-dimensional gather 4 is difficult to spread,
Since the width of the weir is narrower than that of the crotch, the weir 9 is formed with a certain spread. Further, since the rising line 8 of the three-dimensional gather is located inside the line 15 connecting the two fixed portions of the three-dimensional gather elastic body 5 at the free edge, the three-dimensional gather 4
Is lying outside.

In FIG. 4B, the line II-II ′ corresponds to the solid gather erecting line 8 formed by the solid gather elastic body 5 of the free edge 6.
The solid gather 4 rises on the rising line 8 because the solid gather 4 is on the line 15 connecting the two fixing portions. Also, II-I
In the I 'line portion, the upright line 8 changes outward from the II' line portion, and the weir 9 of the three-dimensional gather is raised. Furthermore, I
The solid gather 4 is easily raised because it is farther from the free edge fixing part 14 at the longitudinal end of the solid gather 4 than the -I 'line part.

In (C), the line III-III ′ is because the rising line 8 of the solid gather is outside the line 15 connecting the two fixed parts of the solid gather elastic body 5 of the free edge 6. The three-dimensional gathers 4 are slightly inclined inward of the standing lines 8. The line III-III 'is a crotch portion, and the upright line 8 is a portion curved outwardly.
The weir 9 of the three-dimensional gather is higher than the -I 'line part and the II-II' line part. Further, the II ′ line portion and the II-II ′
As compared with the line portion, the solid gathers 4 are farthest from the free edge fixing portions 14 at both ends in the longitudinal direction of the solid gathers, so that the solid gathers 4 are easily raised. III-III
The 線 line portion is a crotch portion, and since the rising lines 8 are curved outward from the absorber, the three-dimensional gathers 4 are more easily raised.

FIG. 5 shows an embodiment in which the three-dimensional gathers 4 are formed by the back sheet 2. The back sheet 2 extending outward from both lateral edges of the top sheet 1 and the absorber 3 is folded back on the absorber along the side edges of the absorber 3, and is bonded and fixed on the absorber with curved lines. The elastic body 5 is arranged in an extended state on the free edge 6 and is left unconstrained so that the elastic body 5 contracts freely and the solid gather 4 rises. It rises from the line 8 and separates from the absorber 3 to form an opening with gathers, forming a pouch.

FIG. 6 shows a cross-sectional view of another embodiment in which the three-dimensional gathers 4 are formed from the topsheet 1. Back sheet 2
And the topsheet 1 extending outward from both lateral edges of the absorber 3 is folded back on the absorber 3 and fixed with a curved line on the absorber to form an upright line 8 of three-dimensional gathers. 6, an elastic body 5 is arranged in an extended state.
If left unrestricted, the elastic body 5 is freely contracted, and the three-dimensional gathers 4 rise from the rising lines 8 and the absorber 3
Away from the opening to form an opening with gathers to form a pouch.

FIG. 7 is a cross-sectional view of another embodiment in which the three-dimensional gathers 4 are formed by the top sheet 1 and the back sheet 2. Thus, the sheet of the three-dimensional gather 4 is
It is not necessary to constitute a single sheet, and these sheets may be bonded together. When laminating a plurality of sheets, a space may be formed in the three-dimensional gather 4.

FIG. 8 shows an example in which the absorbent article having the pad structure described above is adhered and fixed to an outer layer member to be used and made into a diaper. The disposable diaper has a back part A, a crotch part B
And the abdominal part C. In order to prevent leakage of exudate from around the legs during wearing, elastic members around the legs 11 are disposed in an extended state at least on the crotch B of the outer layer member. Further, the flap 10 of the back side A
In order to improve the fit to the wearer's waist and to prevent leakage of exudate from around the waist, the waist elastic body 1
2 is disposed in an extended state. Further, a fastening tape 13 is provided on the side flap portion 10 of the back side portion A in order to allow the wearer to easily remove the wearable diaper.

The material constituting the outer layer member may be a material impermeable to a liquid impermeable film such as polyethylene, a liquid impermeable film and a nonwoven fabric or a woven fabric, similarly to the back sheet of an absorbent article having a pad structure. May be
Like the liquid permeable surface sheet, a hydrophilic or hydrophobic nonwoven fabric, woven fabric, porous plastic film, or the like may be used. Further, the outer layer member does not need to be constituted by a single sheet, and may be constituted by a plurality of sheets, for example, by changing sheets at the lower surface and the side flap portion of the absorbent article having the pad structure.

Although an example in which the back sheet constituting the absorbent article having the pad structure is liquid-impermeable has been described above, when the back sheet is used as a diaper in combination with the outer layer member as described above,
If a liquid impermeable sheet is used for the outer layer member, the back sheet of the pad structure absorbent article may be the same liquid permeable sheet as the sheet used for the top sheet. Further, the back sheet may not be present on the entire lower surface of the absorber, but may be constituted by a plurality of strip-shaped sheets extending outward from both side edges of the absorber from both side edges in the longitudinal direction of the absorber. .

FIG. 9 shows an example of a disposable diaper having an outer layer member different from that of FIG. In order to prevent leakage of exudate from around the leg during wearing, an elastic body 11 around the leg is disposed in an extended state along the entire circumference along the leg periphery of the outer layer member. Furthermore, in order to improve the fit of the wearer to the waist and prevent leakage of exudate from around the waist, the waist elastics 12 are arranged in an extended state around the waist all around. Also,
In order to allow the wearer to easily remove the diaper,
The fastening tape 13 may be provided on the side flap portion 10 of the back side portion A, or the back flap portion 10 of the back side portion A and the abdomen side portion C may be adhesively closed to form a three-dimensional pants type in advance.

[0048]

As described above, the absorbent article of the present invention comprises a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber disposed between the two sheets, In an absorbent article having three-dimensional gathers, the three-dimensional gathers are formed by folding a flap extending outward from both lateral edges of the absorber outward on the absorber,
In addition, the upright line of the three-dimensional gathers is arranged to be curved outside the absorbent article at the crotch part of the absorbent article, and in a simple manner, the height of the three-dimensional gathers of the crotch part is substantially increased, In addition to preventing leakage at the crotch, the entire three-dimensional gather can be easily raised, and the material used can be reduced, thereby making it possible to manufacture the device at low cost. In addition, the absorbent article of the present invention has an effect that the three-dimensional gathers are more easily raised on the erect lines by fixing the both ends in the longitudinal direction of the three-dimensional gathers outside the erect lines, thereby further improving the leakproofness. It has.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view of an absorbent article of the present invention.

FIG. 2 is a perspective view of the absorbent article of FIG.

FIG. 3 is a plan view showing another example of the absorbent article of the present invention, which is different from FIG.

FIG. 4 is a plan view showing another embodiment of the absorbent article of the present invention, which is different from FIGS. 1 and 3;

FIG. 5 is a line sectional view of the absorbent article of FIG. 4 in a free state in which the elastic body is not restrained.

FIG. 6 is a line sectional view showing another embodiment different from FIG. 5;

FIG. 7 is a line sectional view showing another embodiment different from FIG. 6;

FIG. 8 is a plan view of an absorbent article using the pad structure absorbent article of FIG. 1 in combination with an outer layer member.

FIG. 9 is a plan view showing another embodiment different from FIG. 8;

[Explanation of symbols]

1. 1. Liquid-permeable topsheet 2. Liquid-impermeable back sheet Absorber 4. Solid gathers 5. Elastic body of three-dimensional gathers Solid gather free edge 7. 7. Longitudinal centerline Standing lines of solid gathers 9. 9. Three-dimensional gather weir Side flap 11. Elastic body around the leg 12. Elastic body around waist 13. Fastening tape 14. 14. Fixed part at free edge Line connecting both fixed parts of the elastic body at the free edge L ₁ . Distance between the standing line of the three-dimensional gather and the line connecting both fixed parts of the elastic body at the free edge L ₂ . Three-dimensional gather weir width A. Dorsal side B. Inseam C. Ventral part

Claims (2)

[Claims] 1. A liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber disposed between the two sheets, and a pair of three-dimensional gathers disposed along a longitudinal side edge. In the absorbent article having the three-dimensional gathers, the three-dimensional gathers are formed by folding a flap extending outward from both lateral edges of the absorbent body on the absorbent body, and the standing lines of the three-dimensional gathers are formed of an absorbent material. An absorbent article characterized in that the three-dimensional gather weir in the crotch portion is substantially raised by being curved outside the absorbent article at the crotch portion of the article. 2. The absorbent article according to claim 1, wherein the three-dimensional gathers are fixed at both ends in the longitudinal direction by being folded out of an erect line.