JPH11320742A - Absorber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the cost of an absorber in which two absorbent material layers composed of ground pulp and SAP are stacked, since a tissue is interposed between upper and lower absorbent material layers. At the same time, the tissue blocked urine between the absorbent material layers, and as a result, urine easily returned to the surface. SOLUTION: The tissue 3 is formed by supplying a cover tissue to a pattern drum to form an absorbent material.
Two absorbent material layers 35A and 35B can be laminated in 1 and 33 without interposing a tissue between them. As a result, urine is not blocked between the absorbent material layers, and the absorbency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an absorbent used for pet sheets, disposable diapers, sanitary napkins and the like.

[0002]

2. Description of the Related Art FIGS. 13 and 14 are explanatory views showing a conventional method of manufacturing an absorber. In the method for manufacturing an absorbent body shown in FIG. 13, the carrier tissue 2 is pulled out from the raw material 2a supported on the shaft 1, and is continuously fed. A pulp laminating machine 3 is provided above the carrier tissue 2 which is continuously fed, and pulverized pulp is laminated on the carrier tissue 2 from the pulp laminating machine 3. Further, an injection nozzle 4 for SAP (highly absorbent polymer) is provided on the carrier tissue 2, and the SA is provided on the carrier tissue 2 as necessary.
P is supplied.

Further, a suction chamber 6 is opposed to a position facing the pulp laminating machine 3 and the charging nozzle 4 with the carrier tissue 2 interposed therebetween, and air is sucked through the carrier tissue 2 so that the carrier tissue 2 The ground pulp and SAP are sucked. As a result, a strip-shaped absorbent material layer 5 in which the ground pulp and the SAP are mixed is formed on the carrier tissue 2. A cover tissue is supplied on the strip-shaped absorbent material layer 5, and both sides of the laminate in which the absorbent material layer 5 is sandwiched between the carrier tissue 2 and the cover tissue are cut by a rotary cutter or the like, Further, the individual absorbents are separated and cut.

In the method of manufacturing an absorber shown in FIG. 14, the carrier tissue 2 drawn from the raw material 2a is continuously fed. On the carrier tissue 2 which is continuously fed, a pattern drum 7 is provided.
Is rotated clockwise around the shaft 8 at a peripheral speed corresponding to the traveling speed of the carrier tissue 2.

[0005] On the outer peripheral surface of the pattern drum 7, concave portions 9 are formed at a constant pitch. A mesh 9a having a predetermined opening size is formed at the bottom of the recess 9. The shape when the concave portion 9 is developed in a plane is a predetermined pattern shape such as an hourglass shape. Above the pattern drum 7, a pulp laminating machine 11 facing the outer peripheral surface of the pattern drum 7 is opposed, and similarly, an input nozzle 12 of the SAP is opposed.

In the method of manufacturing an absorber shown in FIG. 14, pulverized pulp is supplied from a pulp laminating machine 11 into a concave portion 9 on the outer peripheral surface of a continuously rotating pattern drum 7, and SAP is supplied from an input nozzle 12 as necessary. Is done. Suction means is provided in the pattern drum 7 at a position facing the pulp laminating machine 11 and the input nozzle 12, and air is sucked through a mesh 9a at the bottom of the concave portion 9, and the suction pressure causes pulverization into the concave portion 9. Pulp and SAP are laminated while being sucked, and the absorbent material layer 1 having a shape conforming to the planar shape of the concave portion 9 is formed.
3 is molded.

When the pattern drum 7 rotates and the recess 9 faces the carrier tissue 2, air is sucked through the carrier tissue 2 by suction means facing below the carrier tissue 2. Due to this suction force, the absorbent material layer 13 formed in the recess 9 is transferred onto the carrier tissue 2. Thereafter, a cover tissue is supplied on the carrier tissue 2 and the absorbent material layer 13, and the carrier material 2 and the cover tissue sandwich the absorbent material layer 13 to form a laminate. Thereafter, the carrier tissue 2 and the cover tissue are cut in accordance with the outer shape of the absorbent material layer 13, and individual absorbents are manufactured.

[0008]

However, the absorber described in the following (1) to (4) remains in the absorber manufactured by the above-mentioned conventional manufacturing method. (1) As shown in FIG. 12, for example, SAP density and SA
Two absorbent material layers 5 (or 13) having different particle sizes of P
In the case of forming a laminated absorber, it is necessary to further interpose the tissue 2 between the upper and lower absorbent material layers 5 (or 13). As a result, three layers of tissue are required, increasing costs. In addition, if a tissue or the like is interposed between the upper and lower absorbent material layers, the liquid that has passed through the upper absorbent material layer is retained by the tissue and the like, and the speed at which the liquid permeates the lower absorbent material layer is reduced. As a result, the absorption speed of the liquid in the entire absorber decreases. If a large amount of liquid is supplied to the upper absorbent material layer, the liquid may overflow upward before being absorbed by the lower absorbent material layer. The reason why the three-layer tissue is required is as follows.

When a different absorbent material layer is to be laminated on the absorbent material layer 5 formed by the production method shown in FIG. 13, the carrier tissue 2 and the absorbent material layer 5 are passed through and then further. It is necessary to suck the ground pulp (and SAP) to be laminated by suction means. However, when the carrier tissue 2 and the absorbent material layer 5 are overlapped, the amount of air permeation decreases,
Absorbent material layers cannot be formed by sucking newly ground pulp or the like thereon.

Therefore, when manufacturing an absorbent body in which two absorbent material layers are stacked, each of the absorbent material layers is connected to each other as shown in FIG.
3, a layered product of the carrier tissue 2 and the absorbent material layer is further placed on the carrier tissue 2 having the absorbent material layer laminated thereon. Therefore, man-hours are required to manufacture a two-layered absorber. Further, in order to cut the laminate into a predetermined shape and separate the laminate into individual absorbers, it is necessary to further place the cover tissue 10 on the upper absorbent material layer 5 (or 13).

Similarly, in the case where an absorbent body in which two absorbent material layers are stacked by the production method shown in FIG. 14 is to be produced, the upper layer is further placed on the carrier tissue 2 and the absorbent material layer 13. It is difficult to laminate the absorbent material layers by attracting them by suction. Therefore,
As in the case of the manufacturing method shown in FIG. 13, it is necessary to stack the absorbent material layers on the carrier tissue 2 in two stages, and the number of steps for realizing the two-layer stacking increases. In addition, the cover tissue 10 is put on the upper absorbent material layer, so that a large number of tissues is required and the cost is increased.

(2) Using the pattern lamination method shown in FIG.
When producing an absorber having a two-layer absorbent material layer, SA
The yield of P deteriorates, and SA
It is difficult to adjust the density of P delicately or to mix SAP with a small particle size (fine) only on one side. The reason is as follows. When the absorbent material layer conforming to the shape of the concave portion 9 is formed in the concave portion 9 formed in the pattern drum 7, the pulverized pulp is formed in the concave portion 9 by the suction force of the air from the mesh 9a at the bottom of the concave portion 9. And it is necessary to attract SAP. In order to form the absorbent material layer by attracting the crushed pulp and the SAP into the concave portion 9, the sieve of the mesh 9a usually has a nominal size of 60 mesh or less. 246 mm or more).

Therefore, the SAP supplied into the recess 9
Are easily transmitted through the mesh 9a by the suction force and fall into the pattern drum 7, and the SAP yield is deteriorated. In particular, if the amount of the SAP contained in the absorbent material layer 13 is increased, the SAP is likely to come off from the mesh 9a, and an attempt is made to form an absorbent material layer containing 20% by weight or more of the SAP. Then, the yield of SAP becomes extremely low. Therefore, if the SAP content is 20% by weight or more,
It is very difficult to produce an absorbent material layer containing 0% by weight or more and even 50% by weight or more.

Further, in order to increase the liquid absorption rate of the absorbent material layer, it is necessary to include an extremely fine SAP. However, when the mesh 9a has a nominal size of 60 mesh, the particle size is 100 mesh or more (mesh size of 100 mesh or more). Opening 0.147
It is practically impossible to include a fine SAP such as a material that passes through a mesh of 200 mm or a mesh of 200 mesh or more (a material that passes through a mesh having an opening of 0.074 mm) in the absorbent material layer.

(3) A case in which two kinds of absorbent material layers are used and one of them contains fine SAP to change the liquid suction speed between the two absorbent material layers. In addition, it is necessary to stack two absorbent material layers vertically as shown in FIG. 12, which increases the thickness of the absorber.

(4) In the manufacturing method shown in FIG. 13, since the absorbent material layer 5 is formed in a strip shape, when two absorbent material layers are stacked, if the shapes of the two absorbent material layers are different. I can't let it. Also, when the carrier tissue 2 and the absorbent material layer 13 formed by the manufacturing method shown in FIG. 14 are stacked in two layers, the shapes of the upper and lower absorbent material layers are the same. If the upper and lower absorbent material layers have the same shape in this way, it is not possible to form an absorber that meets various requirements, for example, increasing the amount of liquid absorbed only in the central part.

The present invention solves the above-mentioned conventional problems. When two absorbent material layers are stacked,
An object of the present invention is to provide an absorber that can be manufactured at low cost by eliminating the need to provide a tissue or the like between the two absorbent material layers. Further, the present invention provides an absorbent body in which a sufficient difference is provided in a liquid absorption speed and a water retention capacity between two absorbent material layers so that return and side leakage of the absorbed liquid can be effectively prevented. It is an object. A further object of the present invention is to provide an absorbent body that uses absorbent material layers having different liquid absorbing capacities and can minimize the thickness. Another object of the present invention is to provide an absorber that can respond to various demands such as partially increasing the water retention amount.

[0018]

Means for Solving the Problems The absorber of the present invention has a first
Are laminated without interposing a sheet between both layers, and a laminate of the two absorbent material layers is formed of a first cover sheet and a second cover sheet. And at least one cover sheet is liquid-permeable.

In the absorber of the present invention, since a sheet such as a tissue is not interposed between the absorbent material layers, it can be manufactured at low cost. In addition, the liquid that has passed through the upper absorbent material layer is immediately absorbed by the lower absorbent material layer without being interrupted, so that the liquid absorbing speed of the entire absorber is increased. Further, when a large amount of liquid is applied to the upper absorbent material layer at a time, this liquid is immediately absorbed by the lower absorbent material layer, so that leakage or return of the liquid to the upper part is unlikely to occur. For example, the first absorbent material layer is formed into a predetermined shape by a concave portion of the pattern drum, and the second absorbent material layer is cut into a square. In this case, it is possible that the first absorbent material layer has a frame shape surrounding each side of the second absorbent material layer.

Further, the first absorbent material layer is a mixture of an absorbent fiber and a superabsorbent polymer, and the second absorbent material layer contains at least an absorbent fiber. It is preferable that the particle size of the superabsorbent polymer contained is 60 mesh or more, and the superabsorbent polymer is 20% by weight or more and 90% by weight or more in the first absorbent material layer.
It is preferable to include the following. In such an absorber, since the liquid is rapidly absorbed by the frame-shaped first absorbent material layer, urine and the like are less likely to leak laterally from the surrounding first absorbent material layer, and It is suitable as an excrement absorbing sheet.

Further, in the present invention, both the first and second absorbent material layers can be formed into a predetermined shape by the concave portion of the pattern drum. In this case, the shape of the absorbent material layer laminated without interposing a sheet such as a tissue can be arbitrarily set according to the purpose of use.

For example, the first and second absorbent material layers have different shapes. In this case, one of the absorbent material layers may be a mixture of a water-absorbent fiber and a superabsorbent polymer, and the other absorbent material layer may be formed of a water-absorbent fiber. However, both are made of a mixture of a water-absorbent fiber and a superabsorbent polymer, and the particle size of the superabsorbent polymer contained in both absorbent material layers is different, or the superabsorbent polymer contained in both absorbent material layers Those with different densities can be configured. Preferably, when the liquid receiving surface is on the front side, the second absorbent material layer containing the fine superabsorbent polymer is directed to the back side,
The particle size of the superabsorbent polymer contained in the second absorbent material layer is 60 mesh or more.

With this configuration, the liquid supplied to the upper absorbent material layer is rapidly drawn by the lower absorbent material layer, and the liquid hardly returns from the upper absorbent material layer. Become. Further, at least the first absorbent material layer directed to the front side has an hourglass shape. Or
The first absorptive material layer has an hourglass shape, and the second absorptive material layer is overlapped only on the central region in the width direction of the second absorptive material layer.

[0024] With this absorbent, it is possible to increase the holding power of the liquid in the central part, and to quickly absorb the liquid given to the central part, making it an optimal absorbent for disposable diapers and sanitary napkins. Become. Further, in the absorbent body of the present invention, the first absorbent material layer and the second absorbent material layer are combined in a planar manner and come into contact with each other, and the laminate of the two absorbent material layers is the first absorbent material layer. The cover sheet is sandwiched between the cover sheet and the second cover sheet, and at least one of the cover sheets is liquid-permeable.

With this absorber, it is possible to make the absorber thin by combining absorbent material layers having different amounts of water retention and liquid absorption. In this case, both the first absorbent material layer and the second absorbent material layer can be formed into a predetermined shape by the concave portion of the pattern drum, and the shape of each absorbent material layer and the two absorbent material layers Can be set arbitrarily.

For example, one of the absorbent material layers is a mixture of a water-absorbent fiber and a superabsorbent polymer and the other absorbent material layer is formed of a water-absorbent fiber, or both absorbent material layers are Both are made of a mixture of a water-absorbing fiber and a superabsorbent polymer, and the particle size of the superabsorbent polymer contained in both absorbent material layers is different, or the density of the superabsorbent polymer contained in both absorbent material layers is Can be different. For example, it is preferable that the particle size of the superabsorbent polymer contained in the absorbent material layers located on both sides of the absorbent material layers combined in a plane is 60 mesh or more.

In the above absorber, the liquid applied to the central portion of the absorber is rapidly absorbed by the absorbent material layers on both sides, so that the liquid spreads quickly throughout the absorber, and the liquid top sheet Return to the side and leakage to both sides are less likely to occur.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view showing a manufacturing method for manufacturing an absorber according to a first embodiment of the present invention. FIG.
In the method for manufacturing an absorber shown in FIG.
An absorber sandwiched between two cover sheets can be manufactured. In this manufacturing method, the pattern drum 21 is used. The pattern drum 21 continuously rotates clockwise in the figure at a constant rotation speed around the shaft 22. As shown in an enlarged manner in FIG.
The recesses 23 are formed at a constant pitch in a. The planar shape of the concave portion 23 in a developed state is, for example, an hourglass shape. When the absorbent material layer 35 shown in FIG. 6 is formed, the concave portion 23 has a frame shape. The bottom portion of the concave portion 23 is a mesh 23a, and has a nominal size of 60 mesh (aperture size of 0.246 m) according to Tyler, USA.
m).

As shown in FIG. 1, above the pattern drum 21, a pulp laminator 24 facing the outer peripheral surface 21a and a charging nozzle 2 for charging SAP (highly absorbent polymer).
5 are facing each other. Input nozzle 25 and pulp laminating machine 24
Can be set as appropriate according to the mixing position of the SAP in the pulverized pulp.

Inside the pattern drum 21, a suction chamber 26 facing the pulp laminating machine 24 and the charging nozzle 25 is provided. Further, inside the pattern drum 21, a pressurizing chamber 27 facing the inside of the concave portion 23 moved to the lowermost position is provided. In the suction chamber 26, air is sucked through the mesh 23a of the concave portion 23 moved above, and in the pressurized chamber 27, the air is pushed out through the mesh 23a of the concave portion 23 moved below.

A cover tissue 31 serving as a first cover sheet is pulled out from a web 31a mounted on a shaft 32, wound around the outer peripheral surface 21a of the pattern drum 21, and then sent out leftward in the figure. The carrier tissue 33 serving as the second cover sheet is pulled out from the web 33a attached to the shaft 34, and is continuously sent at a constant speed to the left in the drawing. A pulp laminator 36 is provided above the carrier tissue 33 to be sent out, and a suction chamber 37 facing the pulp laminator 36 via the carrier tissue 33 is provided below the pulp laminator 36. The rotation of a transport roll (not shown) provided on the left side of the pattern drum 21 causes the carrier tissue 33 to rotate.
Is sent out at the speed V1, and the cover tissue 31 after circling the outer peripheral surface 21a of the pattern drum 21 is moved at the speed V1.
Sent out at 2. Here, the speed V1 = V2.

As shown in an enlarged view in FIG. 4, the cover tissue 31 pulled out from the raw material 31a is formed in a concave shape along the inner surface of the concave portion 23 of the outer peripheral surface 21a of the pattern drum 21. Around the clockwise direction together with the outer peripheral surface 21a. Outer peripheral surface 2 of pattern drum 21
Although the peripheral speed of the cover tissue 1a is equal to the above-mentioned V1, since the cover tissue 31 has entered the concave portion 23, the feeding speed V of the cover tissue 31 from the raw material 31a is V
3 is set to be slightly higher than the speeds V1 and V2.

Next, a method of manufacturing an absorber using the manufacturing apparatus shown in FIG. 1 will be described. The pattern drum 21 rotates clockwise at a constant speed, and the cover tissue 31 serving as the first cover sheet is attached to the outer peripheral surface 21 of the pattern drum 21.
a. Since the suction chamber 26 faces the recess 23 moved to the uppermost portion, the suction pressure passes through the mesh 23a and acts on the cover tissue 31, so that the cover tissue 31 follows the inside of the recess 23. Is deformed into a concave shape.

At this time, the pulverized pulp is supplied from the pulp laminator 24 into the recess 23, and
SAP is provided in 3. The ground pulp and SAP are sucked into the recess 23. As a result, as shown in FIG. 4, in the concave portion 23, the cover tissue 31 is laid along the inner surface of the mesh 23a, and the absorbent material layer, which is a mixture of pulverized pulp and SAP, is laid on the cover tissue 31. 3
5 are formed. The absorbent material layer 35 matches the opening shape of the concave portion 23, and when the pattern drum 21 shown in FIG. 3 is used, the planar shape of the absorbent material layer 35 is an hourglass shape.

On the other hand, ground pulp is supplied onto the carrier tissue 33 from the pulp laminating machine 36. The pulverized pulp is attracted to the carrier tissue 33 by the air suction force of the suction chamber 37, and the absorbent material layer 40 is continuously formed on the carrier tissue 33 in a strip shape.

The rotation of the pattern drum 21 causes the recess 2
3 moves to the lowermost position and reaches a position facing the absorbent material layer 40 on the carrier tissue 33, the absorbent material layer 35 and the cover tissue 31 formed in the concave portion 23 are formed.
Is separated from the inside of the concave portion 23, and the absorbent material layer 35 is transferred onto the absorbent material layer 40.

When the cover tissue 31 is separated from the inside of the recess 23, the cover tissue 31
The absorbent material layer 35 is separated from the inside. At this time, the air jetting force from the pressurizing chamber 27 shown in FIG. 1 acts on the cover tissue 31, and the cover tissue 31 is pushed out of the recess 23. As described above, since the absorbent material layer 35 escapes from the concave portion 23 of the pattern drum 21 together with the cover tissue 31, even if the pressure chamber 27 is not provided or the air pressure in the pressure chamber 27 is weak, The absorbent material layer 35 formed in the recess 23 can be easily separated from the inside of the recess 23.

As a result, it is possible to form a laminated body in which the strip-shaped absorbent material layer 40 and the pattern-formed absorbent material layer 35 are interposed between the carrier tissue 33 and the cover tissue 31. Absorbing body layer 3
By cutting and separating according to the outer shape of No. 5, an absorber is manufactured. In this absorber, it is not necessary to interpose a tissue or the like between the lower second absorbent material layer 40 and the upper first absorbent material layer 35. Note that, between the first absorbent material layer 35 and the cover tissue 31, and between the first absorbent material layer 35 and the cover tissue 31,
Between the absorbent material layer 40 and the carrier tissue 33 may be bonded with a hot-melt adhesive, and the cover tissue 31 and the carrier tissue 33 may be bonded to each other at the outer peripheral portions of the absorbent material layers 35 and 40. May be.

As shown in FIG. 4, the cover tissue 31 is placed on the mesh 23a at the bottom of the concave portion 23 of the pattern drum 21.
Is laid, and ground pulp and SAP are supplied thereon, so that the SAP is moved from the mesh 23a to the pattern drum 21.
It is possible to eliminate the waste of the SAP and improve the yield without getting out inside.

Further, the content of SAP in the absorbent material layer 35 can be increased, and the water retention of the absorbent material layer 35 can be increased. In addition, since the SAP does not escape from the mesh 23a, the amount of the SAP in the absorbent material layer 35 can be set arbitrarily, and the SAP ratio can be easily set, and the variation in the content of the SAP in the individual absorbers can be reduced. Less.

Further, even when the mesh 23a is 60 mesh, the SAP having a finer grain size than the 60 mesh, for example, 100 mesh or more (the mesh having a mesh size of 0.147 mm penetrates) is formed in the absorbent material layer 35. Or a mesh of 200 mesh (a mesh having a mesh size of 0.074 mm) or a finer SAP than that can be mixed, and the liquid absorbing speed of the absorbent material layer can be increased. As described above, the first absorbent material layer 35 in the absorber manufactured according to the present invention can contain SAP having a particle size of 60 to 200 mesh and 20 to 90% by weight.

Further, the first absorbent material layer 35 is
And the second absorbent material layer 40 can be made so as not to contain SAP. Further, by disposing an injection nozzle of SAP at a portion of the pulp laminating machine 36, the absorbent material layer 40 can be made into pulverized pulp and SAP. Can be used as a mixture. Alternatively, the absorbent material layer 40 may be a mixture of ground pulp and SAP, and the absorbent material layer 35 may be composed of only ground pulp.

Further, when the first absorbent material layer 35 and the second absorbent material layer 40 are both formed of a mixture of ground pulp and SAP, the absorbent material layer 35 and the absorbent material layer 4
It is also possible to change the mixing amount or density of the SAP between 0 and 0, or to change the particle size (size) of the mixing SAP between the absorbent material layer 35 and the absorbent material layer 40.

FIG. 2 is an explanatory view showing a manufacturing method for manufacturing an absorber according to a second embodiment of the present invention. In this manufacturing method, a first pattern drum 21A and a second pattern drum 21B having the same structure as the pattern drum 21 shown in FIG. 1, FIG. 2, FIG. 3, and FIG. The second pattern drum 21B continuously rotates at the same speed in the clockwise direction and the second pattern drum 21B in the counterclockwise direction.

A concave portion 23A is formed on the outer peripheral surface 21a of the pattern drum 21A, and a concave portion 23B is formed on the outer peripheral surface 21a of the pattern drum 21B. This recess 23
A and the concave portion 23B may have the same shape or different shapes. Bottom of recess 23A and recess 23
The bottom of B is, for example, a mesh 23a having a mesh size of 60 mesh.
It is.

Above the pattern drum 21A, a pulp laminating machine 24A and an input nozzle 25A of the SAP face each other. Inside the pattern drum 21A, a suction chamber 26A is provided.
Is provided. Similarly, above the pattern drum 21B, the pulp laminating machine 24B and the SAP injection nozzle 25
B face each other, and a suction chamber 26B is provided inside the pattern drum 21B.

In a portion where the outer peripheral surfaces 21a of the pattern drum 21A and the pattern drum 21B face each other, a pressurizing chamber 2 is provided inside the pattern drum 21A.
7A are opposed to each other, and a pressurizing chamber 27B is provided inside the pattern drum 21B so as to face each other.

In the method of manufacturing an absorber shown in FIG. 2, a cover tissue 31A serving as a first cover sheet is supplied to the outer peripheral surface 21a of the first pattern drum 21A, and the cover tissue 31A is provided inside the concave portion 23A of the pattern drum 21A. The tissue 31A is laid, the pulverized pulp is supplied from the pulp laminator 24A, and the SAP is supplied from the input nozzle 25A.
In 3A, on top of the cover tissue 31A, a first absorbent material layer 35A consisting of a mixture of ground pulp and SAP
Is molded.

Outer peripheral surface 21 of second pattern drum 21B
cover tissue 31 which also becomes a second cover sheet
B is supplied. The cover tissue 31B is laid in a concave shape in the concave portion 23B of the second pattern drum 21B,
Pulverized pulp is supplied thereon from the pulp laminator 24B, and SAP is supplied from the input nozzle 25B, and the second absorbent material layer 35B conforming to the shape of the concave portion 23B is formed on the cover tissue 31B.

At the portion where the outer peripheral surfaces 21a of the two pattern drums 21A and 21B face each other, the cover tissue 31A, together with the first absorbent material layer 35A, is recessed.
A, and the cover tissue 31B is separated from the recess 23B together with the second absorbent material layer 35B. Then, the first absorptive material layer 35A and the second absorptive material layer 35B are overlapped to form a laminate in which both sides are sandwiched between the cover tissue 31A and the cover tissue 31B. And the said laminated body is the absorbent material layer 3
Each 5A and 35B is cut | disconnected, and an individual absorber is completed.

The absorbent material layer 35A and the cover tissue 31A, and the absorbent material layer 35B and the cover tissue 31B may be bonded with a hot-melt adhesive. The cover tissue 31A and the cover tissue 31B may be bonded to each other at the outer peripheral portions of 35A and 35B.

Also in this manufacturing method, it is not necessary to interpose a new tissue between the absorbent material layer 35A and the absorbent material layer 35B, so that an absorber having a two-layer structure can be manufactured at low cost. . Further, one of the absorbent material layers 35
A is mixed with SAP, and the other absorbent material layer 35B is SA
P may not be contained, and both the absorbent material layers 35A and 35B may be a mixture of pulverized pulp and SAP, and the amount of mixed SAP or the density of the absorbent material layer 35A and the absorbent material layer 35B may be different from each other. Changeable or absorbent material layer 3
It is also possible to change the particle size (size) of the SAP to be mixed between 5A and the absorbent material layer 35B. Further, as will be described later with reference to FIGS. 9 to 11, between the cover tissue 31A and the cover tissue 31B, the absorbent material layer 35A and the absorbent material layer 35B can be combined in a planar manner.

Next, the structure of the absorber of the present invention manufactured by the above manufacturing method will be described with reference to FIGS. FIG. 5A shows an absorber manufactured by the manufacturing method shown in FIG. 1 or the manufacturing method shown in FIG. In the manufacturing method shown in FIG. 1, between the carrier tissue 33 and the cover tissue 31, the band-shaped second absorbent material layer 40 and the first absorbent material layer 35 formed in the concave portion 23 of the pattern drum 21 are formed. Are interposed in a stacked state.

FIG. 6 shows an example of the shape of the absorbent material layer laminated by the manufacturing method shown in FIG. In this, a frame-shaped absorbent material layer 35 is superimposed on a band-shaped absorbent material layer 40. The frame-shaped absorbent material layer 35 can be formed by forming the concave portion 23 of the pattern drum 21 into a frame shape.

The absorbent having the absorbent material layer shown in FIG. 6 can be used, for example, as a pet excrement absorbing sheet for pets. In this case, the strip-shaped absorbent material layer 40
Is formed of only ground pulp or a mixture of ground pulp and SAP, and the frame-shaped absorbent material layer 35 is formed of a mixture of ground pulp and SAP. Then, the SAP contained in the frame-shaped absorbent material layer 35 is, for example,
Finer than mesh, preferably with a particle size of 1
This mesh is finer than 00 mesh and this fine SAP
20% by weight or more with respect to the absorbent material layer 35,
Preferably, the content is 30% by weight or more, more preferably 50% by weight or more.

A liquid-impermeable back sheet is stacked on the lower surface of the absorber having such absorbent material layers 40 and 35, and a liquid-permeable top sheet is stacked on the upper surface to form a sheet for absorbing pet excrement. Then, since urine excreted on the absorbent material layer 40 is rapidly absorbed by the frame-shaped absorbent material layer 35, it is difficult for the urine to leak to the side.

In the manufacturing method shown in FIG.
It is characterized in that another tissue does not have to be interposed between 0 and the absorbent material layer 35. Frame-shaped absorbent material layer 35
Since no tissue or the like is interposed between the rectangular absorbent material layer 40 and the rectangular absorbent material layer 40, when a large amount of urine is given to the frame-shaped absorbent material 35 at one time, the urine is absorbed by the absorbent material layer 35. And the lower absorbent material layer 40
Since urine is absorbed immediately, urine is less likely to leak laterally.

As shown in FIG. 5A, the absorber manufactured by the manufacturing method shown in FIG. 2 also has an absorbent material layer 35 formed on the second cover tissue 31B with the concave portion 23B.
B is placed thereon, and an absorptive material layer 35A formed with the concave portion 23A is laminated thereon, and the upper surface is covered with the first cover tissue 31A.

FIGS. 7 and 8 show examples of the shapes of the absorbent material layer 35B and the absorbent material layer 35A in the absorber manufactured by the manufacturing method shown in FIG. In FIG.
A first absorbent material layer 35A and a second absorbent material layer 35B
Are both hourglass shapes of the same dimensions. This can be achieved by making the concave portions 23A of the first pattern drum 21A and the concave portions 23B of the second pattern drum 21B shown in FIG.

In FIG. 8, the upper first absorbent material layer 35
A has an hourglass shape, and the lower second absorbent material layer 35
B has a rectangular shape, and the lower absorbent material layer 35B is overlapped only at the center in the width direction of the upper absorbent material layer 35A.

The absorbent material layer 35A shown in FIG. 7 or FIG.
The absorbent body in which the upper and lower sides of the cover tissue 35B are sandwiched between the cover tissues 31A and 31B can be used as a disposable diaper, a sanitary napkin, or a pad for urinary incontinence. In this case, a liquid-impermeable backsheet is stacked below the absorber, and a liquid-permeable topsheet is stacked above.

When the absorber shown in FIG. 7 or FIG. 8 is used, the upper first absorbent material layer 35A is formed of only ground pulp or a mixture of ground pulp and SAP, and the lower second absorbent material layer 35A is formed of ground pulp. The absorbent material layer 35B is formed of a mixture of ground pulp and SAP. In this case, the SAP contained in the lower absorbent material layer 35B has, for example, a size smaller than 60 mesh and preferably smaller than 100 mesh, and absorbs the mixed amount of the fine SAP. 20% by weight or more, preferably 30% by weight or more, more preferably 50% by weight or more and 90% by weight or less with respect to the conductive material layer 35B.

In a disposable diaper or sanitary napkin using the absorbent shown in FIGS. 7 and 8, excrement or secretion given to the upper absorbent material layer 35A is transferred to the upper absorbent material layer 35A. Before the dispersion, the liquid is sucked by the fine SAP having a high absorption rate contained in the lower absorbent material layer 35B, and the liquid does not easily return toward the top sheet. In the case shown in FIG. 8, the liquid applied to the central portion of the upper absorbent material layer 35A is positively sucked by the fine SAP in the lower absorbent material layer 35B. The return of the liquid can be prevented, and the liquid does not easily leak to the side of the absorbent material layer 35A.

Further, as shown in FIG.
Another absorbent material layer 52 is laminated on an absorbent body having an absorbent material layer having a two-layer structure shown in (A) and sandwiched between cover tissues at the top and bottom, and another cover tissue 53 is placed thereon. A covering structure may be used.

Next, according to the manufacturing method shown in FIG. 2, a structure in which the first absorbent material layer 35A and the second absorbent material layer 35B are planarly combined between the cover tissues 31A and 31B is also possible. is there. The combination of the absorbent material layers in this case will be described with reference to FIGS.

In FIG. 9, the absorbent material layer 35A
Are rectangular, and the absorbent material layer 35B is four protruding portions on both left and right sides. In FIG. 10, the absorbent material layer 35A has a rectangular shape, and the absorbent material layer 35B
Has the same rectangular shape combined on both sides of the absorbent material layer 35A. In FIG. 11, the absorbent material layer 35A has a rectangular shape, and the absorbent material layer 35B
It has a frame shape combined with the outer periphery of the absorbent material layer 35A.

At the opposing portion of the pattern drum 21A and the pattern drum 21B shown in FIG. 2, the absorbent material layer 35 formed by the concave portion 23A of the first pattern drum 21A.
A and the absorbent material layer 35B formed in the concave portion 23B of the second pattern drum 21B are combined in a plane, so that the cover tissue 31A and the cover tissue 31B have a flat surface shown in FIGS. It is possible to form an absorber in which a typical absorbent material layer is interposed.

In FIG. 9, the central absorbent material layer 35A is a mixture of ground pulp and SAP,
For example, the particle size is smaller than 60 mesh, preferably smaller than 100 mesh, and the amount of the fine SAP mixed is 20% by weight or more, preferably 30% by weight or more, more preferably 50% by weight. Above is 90% by weight or less. Also, the absorbent material layers 35 on both sides
B is ground pulp alone or a mixture of ground pulp and SAP.

When a disposable diaper or the like is constructed by using the absorbent having the absorbent material layer shown in FIG. 9, the liquid is rapidly absorbed by the central absorbent material layer 35A, and the water retention amount is increased. Therefore, the permeation of the liquid in the direction of the absorbent material layer 35B on both sides is slowed, so that the liquid can be prevented from leaking to the side.

In FIG. 10, the content of SAP in the absorbent material layers 35B located on both left and right sides is increased, and fine SAP is included in the absorbent material layers 35B.
The central absorbent material layer 35A is formed only of ground pulp or a mixture of ground pulp and a relatively large SAP. The liquid absorbed by the central absorbent material layer 35A is drawn by and absorbed by the SAPs of the absorbent material layers 35B on both sides, so that the liquid is returned from the central absorbent material layer 35A to the top sheet side. It can also prevent lateral leakage.

FIG. 11 is a plan view of the one shown in FIG. 6, and the liquid is sucked by the frame-shaped absorbent material layer 35B.

In FIG. 1, a carrier tissue 33 and a cover tissue 31 are used as cover sheets, and in FIG. 2, cover tissues 31A and 31B are used as cover sheets. Alternatively, an absorbent body in which an absorbent material layer is sandwiched between nonwoven fabrics or the like may be manufactured by using a breathable nonwoven fabric or a woven fabric as a cover sheet.

[0073]

As described above, the absorber of the present invention can be manufactured at low cost because no tissue or the like is interposed between the absorbent material layers. Also, since the liquid is not blocked between the absorbent material layers, the liquid absorbed by the upper absorbent material layer is immediately absorbed by the lower absorbent material layer, so that the liquid leaks upward from the upper absorbent material layer. Or return.
Further, by changing the mixed state and the shape of the SAP in the two types of absorbent material layers, it is possible to configure an absorber that meets various demands. Furthermore, by combining the two types of absorbent material layers in a plane, a thin absorber having an excellent absorption function can be formed.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a method for manufacturing an absorber according to a first embodiment of the present invention;

FIG. 2 is an explanatory view showing a method for manufacturing an absorber according to a second embodiment of the present invention;

FIG. 3 is a partial perspective view showing an outer peripheral portion of a pattern drum;

FIG. 4 is a partial cross-sectional view showing a state in which an absorbent material layer is formed by a pattern drum.

FIGS. 5A and 5B are cross-sectional views of an absorber manufactured by the manufacturing method of the present invention.

FIG. 6 is a perspective view showing an example of the shape of the absorbent material layer manufactured by the manufacturing method shown in FIG.

FIG. 7 is a perspective view showing an example of the shape of the absorbent material layer manufactured by the manufacturing method shown in FIG.

8 is a perspective view showing an example of the shape of an absorbent material layer manufactured by the manufacturing method shown in FIG.

9 is a perspective view showing an example of the shape of a planar combination of absorbent material layers manufactured by the manufacturing method shown in FIG. 2;

FIG. 10 is a perspective view showing an example of the shape of a planar combination of absorbent material layers manufactured by the manufacturing method shown in FIG. 2;

11 is a perspective view showing an example of a shape of a planar combination of absorbent material layers manufactured by the manufacturing method shown in FIG. 2;

FIG. 12 is a cross-sectional view of a conventional absorber.

FIG. 13 is an explanatory view showing a conventional method for producing an absorber.

FIG. 14 is an explanatory view showing a conventional method for producing an absorber,

[Explanation of symbols]

 21, 21A, 21B Pattern drum 23, 23A, 23B Concave part 23a Mesh 24, 24A, 24B Pulp laminating machine 25, 25A, 25B SAP injection nozzle 31, 31A, 31B Cover tissue 33 Carrier tissue 35, 35A, 35B Molded with concave part Absorbent material layer 40 Band-shaped absorbent material layer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B01J 20/28 A41B 13/02 S A61F 13/18 302

Claims (19)

[Claims] 1. A first absorbent material layer and a second absorbent material layer are laminated without interposing a sheet between the two layers, and the laminate of the two absorbent material layers is a first cover. An absorbent body sandwiched between a sheet and a second cover sheet, wherein at least one of the cover sheets is liquid-permeable. 2. The absorbent material according to claim 1, wherein the first absorbent material layer is formed into a predetermined shape by a concave portion of the pattern drum, and the second absorbent material layer is cut into a square. body. 3. The absorber according to claim 2, wherein the first absorbent material layer has a frame shape surrounding each side of the second absorbent material layer. 4. The first absorbent material layer is a mixture of an absorbent fiber and a super absorbent polymer, and the second absorbent material layer contains at least an absorbent fiber. The absorbent according to claim 3, wherein the particle size of the superabsorbent polymer contained is 60 mesh or more. 5. The absorber according to claim 4, wherein the first absorbent material layer contains a superabsorbent polymer in an amount of 20% by weight or more and 90% by weight or less. 6. The absorber according to claim 1, wherein both the first absorbent material layer and the second absorbent material layer are formed into a predetermined shape by a concave portion of the pattern drum. 7. The absorber according to claim 6, wherein the first absorbent material layer and the second absorbent material layer have different shapes. 8. The absorbent body according to claim 7, wherein one of the absorbent material layers is formed of a mixture of a water-absorbent fiber and a superabsorbent polymer, and the other absorbent material layer is formed of a water-absorbent fiber. 9. The absorbent material according to claim 6, wherein both the absorbent material layers are made of a mixture of a water-absorbing fiber and a superabsorbent polymer, and the particle sizes of the superabsorbent polymers contained in the two absorbent material layers are different. body. 10. The both absorbent material layers are each composed of a mixture of a water-absorbing fiber and a superabsorbent polymer, and the densities of the superabsorbent polymers contained in the two absorbent material layers are different.
The absorbent body as described in the above. 11. When the surface receiving the liquid is on the front side, the second absorbent material layer containing the fine superabsorbent polymer is turned to the back side, and the high absorbent material contained in the second absorbent material layer is turned on. 7. The particle size of the absorbent polymer is 60 mesh or more.
11. The absorbent body according to any one of items 1 to 10. 12. A first side facing at least the front side
The absorbent body according to claim 11, wherein the absorbent material layer has an hourglass shape. 13. The first absorbent material layer has an hourglass shape, and the second absorbent material layer is overlapped only on the central region in the width direction of the second absorbent material layer. The absorbent body as described in the above. 14. A first absorbent material layer and a second absorbent material layer are combined in a planar manner and come into contact with each other, and the laminate of the two absorbent material layers is formed on the first cover sheet and the first absorbent sheet. An absorbent body sandwiched between second cover sheets, wherein at least one of the cover sheets is liquid-permeable. 15. The absorber according to claim 14, wherein both the first absorbent material layer and the second absorbent material layer are formed into a predetermined shape by a concave portion of the pattern drum. 16. The absorbent body according to claim 14, wherein one of the absorbent material layers is formed of a mixture of a water-absorbent fiber and a superabsorbent polymer, and the other absorbent material layer is formed of a water-absorbent fiber. 17. The two absorbent material layers are both composed of a mixture of a water absorbent fiber and a super absorbent polymer, and the particle sizes of the super absorbent polymers contained in the two absorbent material layers are different.
16. The absorber according to 4 or 15. 18. The absorbent material layer according to claim 1, wherein both of the absorbent material layers are made of a mixture of a water-absorbing fiber and a superabsorbent polymer, and the superabsorbent polymer layers have different densities.
16. The absorber according to 4 or 15. 19. The particle size of the superabsorbent polymer contained in the absorbent material layers located on both sides of the planarly combined absorbent material layers is 60 mesh or more.
19. The absorber according to any one of 4 to 18.