Absorbent sheet

Abstract

To achieve both a leak prevention property of an absorbent sheet and an attachment property of the absorbent sheet to an absorbent article and disposability.SOLUTION: A disclosed absorbent sheet 10 includes an absorbent sheet body 12 which extends in a longitudinal direction and includes a high water-absorbent polymer 11, a fold-back part 13 which is positioned on both sides of the absorbent sheet body 12 in a width direction intersecting with the longitudinal direction and is folded back to one side from both ends in the width direction of the absorbent sheet body 12 through a fold 18 extending in the longitudinal direction, and release paper 15 which is arranged between the fold-back part 13 in a state of folding back and the absorbent sheet body 12 and is bonded at least to the absorbent sheet body 12 by a first water-soluble binder 14.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to an absorbent sheet.

Background Art

[0002] Absorbent sheets that are used by being attached supplementarily to absorbent articles such as light incontinence care products, urine collection pads, pants-type diapers, and tape-fastened diapers are known (for example, Patent Document 1). After absorbing body fluids such as urine, this supplementary absorbent sheet can be removed from the absorbent article and discarded.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, absorbent sheets that are used by being attached supplementarily to absorbent articles such as light incontinence care products, urine collection pads, pants-type diapers, and tape-fastened diapers are, of course, required to prevent leakage of body fluids such as urine, and in addition, compatibility between the wearability with respect to the absorbent article and the disposability when removing from the absorbent article is required.

[0005] Therefore, an object of the present disclosure is to provide an absorbent sheet capable of achieving leakage prevention and compatibility between wearability with respect to an absorbent article and disposability.

Means for Solving the Problems

[0006] In order to solve the above problems, the absorbent sheet according to the first aspect of the present invention includes an absorbent sheet body that extends in the longitudinal direction and contains a superabsorbent polymer, and is located on both sides in the width direction that intersects the longitudinal direction of the absorbent sheet body, and is folded back from both ends in the width direction of the absorbent sheet body to one side through a fold that extends in the longitudinal direction. A folded-back portion, and a release paper disposed between the folded-back portion in the folded state and the absorbent sheet body, and adhered to at least the absorbent sheet body with a first water-soluble binder.

[0007] The second aspect of the present invention is the absorbent sheet according to the first aspect, wherein the first water-soluble binder is provided at both end portions in the width direction of the absorbent sheet body.

[0008] The third aspect of the present invention is the absorbent sheet according to the first aspect or the second aspect, wherein the folded-back portion is not provided with a superabsorbent polymer.

[0009] The fourth aspect of the present invention is the absorbent sheet according to any one of the first aspect to the third aspect, wherein the length in the width direction of the folded-back portion is 10 mm or more and 80 mm or less.

[0010] The fifth aspect of the present invention is the absorbent sheet according to any one of the first aspect to the fourth aspect, wherein the absorbent sheet body has a skin-side sheet on the skin side that sandwiches the superabsorbent polymer and a non-skin-side non-skin-side sheet, and the skin-side sheet and the non-skin-side sheet are water-permeable non-woven fabrics, and the central portion in the width direction of the non-skin-side sheet is subjected to a water-repellent treatment.

[0011] The sixth aspect of the present invention is the absorbent sheet according to any one of the first aspect to the fourth aspect, wherein the absorbent sheet body has a skin-side sheet on the skin side that sandwiches the superabsorbent polymer and a non-skin-side non-skin-side sheet, and the skin-side sheet and the non-skin-side sheet are water-permeable non-woven fabrics, and a water-impermeable film is adhered to at least one of the skin side and the non-skin side of the non-skin-side sheet.

[0012] The seventh aspect of the present invention is an absorbent sheet according to any one of the first to fourth aspects described above, wherein the absorbent sheet body has a skin-side sheet on the skin side that sandwiches a superabsorbent polymer and a non-skin-side sheet on the non-skin side, the skin-side sheet is a water-permeable non-woven fabric, the non-skin-side sheet is a non-water-permeable film, and the length of the non-skin-side sheet in the width direction is shorter than the length of the skin-side sheet in the width direction.

[0013] The eighth aspect of the present invention is an absorbent sheet according to any one of the first to seventh aspects described above, wherein the absorbent sheet body has a polymer presence region where a superabsorbent polymer is present and a polymer non-presence region where a superabsorbent polymer is not present, and the polymer presence region and the polymer non-presence region each extend in the longitudinal direction and are alternately arranged with each other in the width direction.

[0014] The ninth aspect of the present invention is an absorbent sheet according to any one of the first to eighth aspects described above, wherein the release paper is adhered to the folded portion in the folded state with a second water-soluble binder.

[0015] The tenth aspect of the present invention is the absorbent sheet according to the ninth aspect described above, wherein the second water-soluble binder is provided at a position within 20 mm from the fold line in the folded portion.

Advantages of the Invention

[0016] According to the present disclosure, it is possible to prevent leakage of the absorbent sheet and to achieve both the mountability and disposability of the absorbent sheet with respect to the absorbent article.

Brief Description of the Drawings

[0017]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0018] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. These are presented for illustrative purposes and do not limit the present invention. The same reference numerals are assigned to the same elements throughout the description of the embodiment.

[0019] In addition, in the description of this specification, the time of wearing the absorbent sheet 1 refers to at least one of the time of wearing and after wearing of the absorbent article 2 to which the absorbent sheet 1 is attached. The longitudinal direction of the absorbent sheet 1 is the direction that extends across the front and back of the wearer when the absorbent article 2 to which the absorbent sheet 1 is attached is worn. In the figure, the symbol Y indicates the front side in the longitudinal direction. Further, the width direction of the absorbent article 2 is the direction that is horizontal or orthogonal to the longitudinal direction (the direction that extends across the left and right of the wearer when worn). In the figure, the symbol X indicates the left side in the width direction. Also, the skin side refers to the direction facing the wearer's skin side in the thickness direction of the absorbent sheet 1 (the direction indicated by the symbol Z in the figure), and the non-skin side refers to the direction facing the side opposite to the wearer's skin side when worn (the direction opposite to the direction indicated by the symbol Z in the figure). Body fluid refers to a liquid discharged from the body to the outside, such as urine, blood, and moisture in soft feces. Furthermore, examples of the absorbent article 2 include, but are not limited to, light incontinence care products, urine collection pads, pant-type disposable diapers, and tape-fastened disposable diapers, regardless of whether they are for babies or adults, and other absorbent articles may also be used.

[0020] FIG. 1 is a plan view of a state in which an absorbent sheet 10 according to a first embodiment of the present invention is attached to an absorbent article 2. FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1. The white arrow in FIG. 2 schematically indicates the moving direction of body fluid.

[0021] As shown in FIGS. 1 and 2, the absorbent sheet 10 according to the first embodiment of the present invention is an absorbent sheet 10 that is attached to an absorbent article 2 such as a disposable diaper and used as an auxiliary.

[0022] The absorbent article 2 includes a top sheet 3 disposed on the skin side, a back sheet 4 disposed on the non-skin side facing the top sheet 3, an absorber 5 disposed between the top sheet 3 and the back sheet 4, and left and right gather sheets 6 that form a pair of left and right gathers 6c on the top sheet 3. Thereby, the absorber 5 has a structure sandwiched between the top sheet 3 and the back sheet 4.

[0023] The topsheet 3 is formed of a water-permeable (liquid-permeable) non-woven fabric that allows body fluids to move to the absorber 5. As an example of the non-woven fabric, for example, non-woven fabrics such as air-through non-woven fabric, thermal-bonded non-woven fabric, spunbond non-woven fabric, etc., and composite non-woven fabrics obtained by laminating thermal-bonded / spunbond are available. In the present embodiment, the topsheet 3 is formed of a water-permeable non-woven fabric, but it is not limited thereto. For example, it may be formed of a foamed film such as a water-permeable urethane foam, or a composite sheet obtained by laminating a non-woven fabric and a foamed film. Further, the topsheet 3 may be embossed or perforated on the surface in order to improve water permeability. As a method for performing these embossing and perforating processes, known methods can be implemented without limitation. Further, in order to reduce irritation to the skin, the topsheet 3 may contain lotion, antioxidant, anti-inflammatory component, pH adjuster, antibacterial agent, moisturizing agent, etc.

[0024] The backsheet 4 may be formed using a water-impermeable (liquid-impermeable) base material that prevents the body fluid held by the absorber 5 from wetting the clothing, and is formed of materials such as a resin film or a composite sheet obtained by laminating a resin film and a non-woven fabric. The non-woven fabric used for the composite sheet is not particularly limited in the manufacturing method. For example, spunbond non-woven fabric, meltblown non-woven fabric, or composite non-woven fabrics obtained by laminating spunbond / meltblown, spunbond / meltblown / spunbond, and these composite materials can be mentioned. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and composite films of polyethylene and polypropylene.

[0025] The absorber 5 contains a highly water-absorbent polymer 7 (SAP (super absorbent polymer)) that can absorb urine and prevent backflow. As the highly water-absorbent polymer 7, those formed from materials such as sodium polyacrylate-based, polyaspartate-based, (starch-acrylic acid) graft copolymer, (acrylic acid-vinyl alcohol) copolymer, (isobutylene-maleic anhydride) copolymer and its saponified product can be used.

[0026] The left and right gather sheets 6 are sheets that form a pair of left and right gathers 6c. The outer end portions 6a in the width direction (the direction crossing the longitudinal direction) are fixed to the outer end portions in the width direction of the back sheet 4, and the portions 6b inside the outer end portions 6a in the width direction are fixed to the outer end portions in the width direction of the top sheet 3. The region 6c inside the portion 6b fixed to the top sheet 3 in the width direction is a free end. Among the left and right gather sheets 6, the region 6c inside the portion 6b fixed to the top sheet 3 in the width direction (the region on the free end side) functions as a gather 6c extending in the longitudinal direction. As the gather sheet 6, a water-repellent or non-water-permeable non-woven fabric formed of hydrophobic fibers, for example, a spunbond non-woven fabric, a meltblown non-woven fabric, a composite non-woven fabric in which spunbond / meltblown / spunbond is laminated, etc. are used.

[0027] FIG. 3 is a plan view of the absorbent sheet 10 according to the first embodiment of the present invention. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3.

[0028] As shown in FIGS. 3 and 4, the absorbent sheet 10 according to the present embodiment is an absorbent sheet 10 that is attached and used on the skin side surface of the top sheet 3 of the absorbent article 2, and includes an absorbent sheet body 12 containing a superabsorbent polymer 11, left and right folded-back portions 13 provided on both sides in the width direction of the absorbent sheet body 12, and a release paper 15 adhered to the non-skin side of the absorbent sheet body 12 by a water-soluble binder 14.

[0029] The absorbent sheet body 12 has a skin-side sheet 16 disposed on the skin side, a non-skin-side sheet 17 disposed on the non-skin side facing the skin-side sheet 16, and a superabsorbent polymer 11 provided between the skin-side sheet 16 and the non-skin-side sheet 17, and is formed in a sheet shape. Thereby, the superabsorbent polymer 11 has a structure sandwiched between the skin-side sheet 16 and the non-skin-side sheet 17. Note that the skin-side sheet 16 and the non-skin-side sheet 17 have a structure in which the peripheries of the superabsorbent polymer 11 of both sheets 16 and 17 are joined to each other so that the superabsorbent polymer 11 does not spill out. This joining can be performed with a known water-insoluble hot melt or heat seal. By taking this processing method, it is possible to prevent the sheets 16 and 17 from separating due to the water absorption or the swelling force of the superabsorbent polymer 11 even during water absorption, and it is possible to prevent the superabsorbent polymer 11 from spilling out.

[0030] The skin-side sheet 16 is formed of a non-woven fabric having water permeability (liquid permeability) such that body fluid from the skin side moves to the superabsorbent polymer 11. Examples of the non-woven fabric include non-woven fabrics such as air-through non-woven fabric, thermal bond non-woven fabric, spunbond non-woven fabric, and composite non-woven fabric in which thermal bond / spunbond is laminated. Note that in the present embodiment, the skin-side sheet 16 is formed of a water-permeable non-woven fabric, but is not limited thereto, and may be formed of, for example, a foamed film such as a water-permeable urethane foam, or a composite sheet in which a non-woven fabric or a foamed film is laminated. Further, the skin-side sheet 16 may be embossed or perforated on the surface in order to improve water permeability. As methods for performing these embossing and perforating processes, known methods can be implemented without limitation. Further, in order to reduce irritation to the skin, the skin-side sheet 16 may contain a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a moisturizing agent, or the like.

[0031] In this embodiment, the skin-side sheet 16 has a central portion 16a extending in the longitudinal direction and both end portions 16b in the width direction that project in a feather shape outward in the width direction from both ends in the width direction of the central portion 16a. The central portion 16a of the skin-side sheet 16 functions as a part of the absorbent sheet main body 12. Both end portions 16b in the width direction of the skin-side sheet 16 function as left and right folding portions 13, which will be described later.

[0032] The non-skin-side sheet 17 is a sheet formed of a water-permeable (liquid-permeable) non-woven fabric, and has adhesive regions 17a at the outer end portions on both sides in the width direction and a water-repellent region 17b between the left and right adhesive regions 17a. In this embodiment, the length of the non-skin-side sheet 17 in the width direction is substantially the same as the length of the absorbent sheet main body 12 in the width direction. That is, the left and right adhesive regions 17a of the non-skin-side sheet 17 are provided at both end portions in the width direction of the absorbent sheet main body 12. The left and right adhesive regions 17a of the non-skin-side sheet 17 are regions that are adhered to the top sheet 3 of the absorbent article 2 during use, extend in the longitudinal direction at both end portions in the width direction of the absorbent sheet main body 12, and have water permeability. A water-soluble binder (first water-soluble binder) 14 is provided along the longitudinal direction on the non-skin-side surface of the left and right adhesive regions 17a of the non-skin-side sheet 17. That is, the water-soluble binder 14 is provided at both end portions in the width direction of the absorbent sheet main body 12. The water-repellent region 17b of the non-skin-side sheet 17 is a region at the center in the width direction of the non-skin-side sheet 17 (more central in the width direction than the left and right adhesive regions 17a), and has been subjected to a water-repellent treatment. The water-repellent region 17b of the non-skin-side sheet 17 has been subjected to a water-repellent treatment, for example, by coating the skin-side surface of the non-skin-side sheet 17 with a coating agent such as silicon or fluorine. In the water-repellent region 17b of the non-skin-side sheet 17, moisture from the side of the superabsorbent polymer 11 (skin side) is repelled by the coating agent. Note that the water-repellent region 17b of the non-skin-side sheet 17 ensures air permeability even though it has been subjected to a water-repellent treatment.

[0033] The water-soluble binder 14 provided on the non-skin surface side of the left and right adhesion regions 17a of the non-skin surface side sheet 17 is a binder having the property of dissolving in water. For example, a water-soluble polyvinyl alcohol-based binder, a water-soluble acrylic-based binder, a water-soluble urethane-based binder, a water-soluble urethane-modified ether-based binder, a water-soluble polyethylene oxide-based binder, a water-soluble polyamide-based binder, a water-soluble phenol-based binder, a water-soluble vinyl acetate-based binder, a water-soluble styrene acrylic acid-based binder, a water-soluble styrene maleic acid-based binder, a water-soluble styrene acrylic maleic acid-based binder, a water-soluble polyester-based binder, a water-soluble polyvinyl acetal-based binder, a water-soluble polyester-urethane-based binder, a water-soluble polyether-urethane-based binder, or a water-soluble hot melt adhesive can be used. Among them, the water-soluble hot melt adhesive is preferable in terms of water solubility and temporary adhesiveness (adhering by heating but having the property that the adhesive force decreases in a wet state). Water-soluble hot melts that are known (Japanese Patent Laid-Open Nos. 51-77632, 5-5084, 6-49423, 07-305041, 08-092537, 09-031431, 11-323305, etc.) can be used. Among them, a water-soluble hot melt having excellent high-speed adhesiveness (Japanese Patent Laid-Open No. 11-323305) is preferable.

[0034] The highly water-absorbent polymer 11 is a material that can absorb body fluids such as urine and prevent backflow. For example, materials formed from sodium polyacrylate-based, polyaspartate-based, (starch-acrylic acid) graft copolymers, (acrylic acid-vinyl alcohol) copolymers, (isobutylene-maleic anhydride) copolymers and their saponified products, etc. can be used. Note that the highly water-absorbent polymer 11 may be wrapped in a carrier sheet (not shown). The base material of the carrier sheet may be any material having hydrophilicity, and examples thereof include hydrophilic non-woven fabrics such as tissue, absorbent paper, and airlaid non-woven fabric.

[0035] The left and right folding parts 13 are located on both sides in the width direction of the absorbent sheet body 12, and are parts that can be folded through the fold lines 18 extending in the longitudinal direction. In this embodiment, the left and right folding parts 13 are constituted by both end parts 16b in the width direction of the skin-side sheet 16, and no superabsorbent polymer is provided. The length L1 in the width direction of the left and right folding parts 13 (the length L1 in the width direction in a state where the folding parts 13 are extended outward from the absorbent sheet body 12 in the width direction) is set to be 10 mm or more and 80 mm or less. The left and right folding parts 13 are in a stored state (the state shown in FIGS. 3 and 4) folded from the fold lines 18 at both ends in the width direction of the absorbent sheet body 12 to one side (in this embodiment, the non-skin side), and can be changed from the stored state to a deployed state (the state shown in FIGS. 1 and 2) when worn. The left and right folding parts 13 in the stored state extend inward in the width direction of the absorbent sheet body 12 from the fold lines 18. In FIG. 4, for easy understanding, the fold lines 18 are illustrated as black dots. Also, the fold lines 18 may be fold lines 18 processed to be easily bent, or may be simply the bent parts (for example, both ends in the width direction of the absorbent sheet body 12 (fold lines 18)) that naturally occur at the base when the left and right folding parts 13 are folded without any processing for easy bending.

[0036] The release paper 15 is disposed between the left and right folding parts 13 in the stored state and the absorbent sheet body 12 (the non-skin side sheet 17), and is adhered to the absorbent sheet body 12 by a water-soluble binder 14 provided on the absorbent sheet body 12. In this embodiment, both end parts in the width direction of one release paper 15 are adhered to the absorbent sheet body 12 by the water-soluble binder 14. The water-soluble binder 14 is provided on the absorbent sheet body 12 so as to remain on the absorbent sheet body 12 side even when the release paper 15 is peeled off. For example, the surface of the release paper 15 may be subjected to a process that makes it easy to peel off from the water-soluble binder 14. When using the absorbent sheet 10, the release paper 15 is peeled off and used.

[0037] On the surfaces (the surfaces on the skin side) of the left and right folding portions 13 that face the release paper 15 in the stored state, a water-soluble binder (second water-soluble binder) 19 having a property of being soluble in water is provided. As the water-soluble binder 19, the same one as the water-soluble binder 14 provided on the absorbent sheet body 12 can be used. The water-soluble binder 19 is provided in a state of extending in the longitudinal direction at a position spaced apart from the fold line 18 of the left and right folding portions 13. The separation distance (distance along the folding portion 13) L2 of the water-soluble binder 19 from the fold line 18 of the left and right folding portions 13 is set within 20 mm. That is, the water-soluble binder 19 is provided at a position within 20 mm from the fold line 18 in the folding portion 13. The left and right folding portions 13 are adhered to the release paper 15 with the water-soluble binder 19. The water-soluble binder 19 is provided on the left and right folding portions 13 so as to remain on the left and right folding portion 13 sides even when the left and right folding portions 13 are peeled off from the release paper 15. When using the absorbent sheet 10, the left and right folding portions 13 are peeled off from the release paper 15 and used. Further, in the folding portion 13, a region 13a where the water-soluble binder 19 is not provided is provided on the tip side (the side spaced apart from the fold line 18) of the water-soluble binder 19.

[0038] Next, the case of attaching the absorbent sheet 10 to the absorbent article 2 will be described. When attaching the absorbent sheet 10 to the absorbent article 2, first, the left and right folding portions 13 are peeled off from the release paper 15, and then the release paper 15 is peeled off and removed from the absorbent sheet body 12. Next, the absorbent sheet 10 is disposed between the left and right gathers 6c at a desired position (for example, the region located under the crotch) in the longitudinal direction of the absorbent article 2, and the absorbent sheet body 12 is adhered to the surface on the skin side of the topsheet 3 of the absorbent article 2 with the water-soluble binders 14 on both sides in the width direction thereof. Finally, the left and right folding portions 13 are adhered to the inner surfaces in the width direction of the left and right gathers 6c of the absorbent article 2 with the water-soluble binder 19 (see FIGS. 1 and 2).

[0039] In the absorbent sheet 10 configured as described above, left and right folded-back portions 13 are provided on both sides in the width direction of the absorbent sheet body 12, and since it can be bent through a fold line 18 extending in the longitudinal direction, in a state where the absorbent sheet 10 is attached to the absorbent article 2, the left and right folded-back portions 13 can be erected with respect to the absorbent sheet body 12. In the present embodiment, in a state where the absorbent sheet 10 is attached to the absorbent article 2, the left and right folded-back portions 13 are adhered to the left and right gathers 6c of the absorbent article 2, so the left and right folded-back portions 13 can be erected along the left and right gathers 6c. For this reason, since the movement of body fluid from the skin surface side of the absorbent sheet 10 to both sides in the width direction can be restricted to the left and right folded-back portions 13 and the left and right gathers 6c, leakage of body fluid (leakage in the width direction) from the absorbent sheet 10 can be prevented. Also, at this time, since the left and right folded-back portions 13 of the absorbent sheet 10 overlap the left and right gathers 6c, the left and right gathers 6c are substantially doubled (doubled by overlapping the left and right folded-back portions 13), so it becomes difficult for body fluid to permeate, and lateral leakage of body fluid can be prevented by both the overlapping gathers 6c and folded-back portions 13.

[0040] Further, since a release paper 15 adhered with a water-soluble binder 14 is provided with respect to the absorbent sheet body 12, when attaching the absorbent sheet 10 to the absorbent article 2, as described above, by simply removing the release paper 15 from the absorbent sheet body 12 side and adhering the absorbent sheet 10 to the absorbent article 2 with the water-soluble binder 14, the absorbent sheet 10 can be easily attached to a desired position of the absorbent article 2.

[0041] In addition, when the absorbent sheet 10 is attached to the absorbent article 2, the absorbent sheet main body 12 of the absorbent sheet 10 is adhered to the top sheet 3 of the absorbent article 2 by the water-soluble binder 14. Since the water-soluble binder 14 has the property of dissolving in water, when the highly water-absorbent polymer 11 of the absorbent sheet 10 absorbs body fluid or after absorption, the water-soluble binder 14 can be dissolved by the body fluid flowing from the absorbent sheet 10 side to the absorbent article 2 side. Therefore, after the absorbent sheet 10 absorbs body fluid, the absorbent sheet 10 can be easily removed from the absorbent article 2.

[0042] In addition, since the left and right folding parts 13 are provided on both sides in the width direction of the absorbent sheet main body 12 of the absorbent sheet 10, when removing the absorbent sheet 10 from the absorbent article 2, by gripping the left and right folding parts 13, the absorbent sheet 10 can be easily removed from the absorbent article 2.

[0043] In addition, when the absorbent sheet 10 is attached to the absorbent article 2, the left and right folding parts 13 of the absorbent sheet 10 are adhered to the left and right gathers 6c of the absorbent article 2 by the water-soluble binder 19. Since the water-soluble binder 19 has the property of dissolving in water, when the highly water-absorbent polymer 11 of the absorbent sheet 10 absorbs body fluid or after absorption, the water-soluble binder 19 can be dissolved by the body fluid. Therefore, after the absorbent sheet 10 absorbs body fluid, the absorbent sheet 10 can be easily removed from the absorbent article 2.

[0044] In addition, since the water-soluble binder 14 provided on the absorbent sheet main body 12 is provided at both end portions in the width direction of the absorbent sheet main body 12, unlike the case where the water-soluble binder 14 is provided at the central portion in the width direction of the absorbent sheet main body 12, the water-soluble binder 14 can be arranged at a position shifted in the width direction from the wearer's excretion part. Therefore, when the water-soluble binder 14 dissolves, contact of the water-soluble binder 14 with the wearer's excretion part can be suppressed, and a decrease in the wearing feeling can be prevented.

[0045] In addition, the water-soluble binder 19 provided at the left and right folding portions 13 is adhered to the left and right gathers 6c of the absorbent article 2 located on both sides in the width direction of the absorbent sheet body 12. Therefore, the water-soluble binder 19 can be disposed at a position shifted in the width direction from the wearer's excretory part. For this reason, when the water-soluble binder 19 dissolves, contact of the water-soluble binder 19 with the wearer's excretory part can be suppressed, and a decrease in the wearing feeling can be prevented.

[0046] In addition, since the water-soluble binder 14 provided on the absorbent sheet body 12 is provided at both end portions in the width direction of the absorbent sheet body 12, even if the melted water-soluble binder 14 remains on the top sheet 3 after the absorbent sheet 10 is removed from the absorbent article 2, it does not remain in the central portion in the width direction of the top sheet 3. For this reason, after the absorbent sheet 10 is removed from the absorbent article 2, unlike the case where the melted water-soluble binder 14 remains in the central portion in the width direction of the top sheet 3, a decrease in the absorbency of the absorbent article 2 due to the melted water-soluble binder 14 can be suppressed.

[0047] In addition, the left and right folding portions 13 in the stored state are adhered to the release paper 15 with the water-soluble binder 19. For this reason, since the transition of the left and right folding portions 13 in the stored state to the unfolded state is suppressed by the adhesion to the release paper 15, the folding stability of the absorbent sheet 10 before use can be improved.

[0048] In addition, since the water-soluble binder 19 is provided at the left and right folding portions 13 in the stored state, when attached to the absorbent article 2, the absorbent sheet 10 can be fixed to the inner surfaces in the width direction of the left and right gathers 6c of the absorbent article 2, and the stability of the absorbent sheet 10 can be ensured.

[0049] In addition, since the highly water-absorbent polymer is not provided in the left and right folding portions 13, when the absorbent sheet 10 absorbs body fluid, a swelling region of the highly water-absorbent polymer does not occur in the left and right folding portions 13. Therefore, when removing the absorbent sheet 10 from the absorbent article 2, the left and right folding portions 13 are easy to grip, so the absorbent sheet 10 can be easily removed from the absorbent article 2.

[0050] In addition, the length L1 in the width direction of the left and right folding portions 13 (the length L1 in the width direction in a state where the folding portions 13 are extended outward in the width direction from the absorbent sheet main body 12) is set to be 10 mm or more and 80 mm or less. If the length in the width direction of the left and right folding portions 13 is too short, it may be difficult to grip the left and right folding portions 13 when removing the absorbent sheet 10 from the absorbent article 2. In this embodiment, since the length L1 in the width direction of the left and right folding portions 13 is set to be 10 mm or more, the folding portions 13 can be preferably gripped. Also, if the length L1 in the width direction of the left and right folding portions 13 is too short, when gripping the left and right folding portions 13, the fingers may contact the absorbent sheet main body 12 and get dirty. In this embodiment, since the length L1 in the width direction of the left and right folding portions 13 is set to be 10 mm or more, contact of the fingers with the absorbent sheet main body 12 when gripping the left and right folding portions 13 can be suppressed. Further, if the length L1 in the width direction of the left and right folding portions 13 is too long, in a state where the absorbent sheet 10 is attached to the absorbent article 2, the left and right folding portions 13 may protrude toward the skin side more than the left and right gathers 6c, and there is a risk of contacting the skin of the wearer and deteriorating the wearing feeling. In this embodiment, since the length L1 in the width direction of the left and right folding portions 13 is set to be 80 mm or less, protrusion of the left and right folding portions 13 toward the skin side more than the left and right gathers 6c can be suppressed, and deterioration of the wearing feeling can be prevented. If the length L1 in the width direction of the left and right folding portions 13 exceeds 80 mm, the absorbent sheet 10 (the left and right folding portions 13) protrudes toward the skin side beyond the height of the left and right gathers 6c, so it contacts the skin of the wearer and the wearing feeling deteriorates.

[0051] Also, since the water-soluble binder 19 provided in the left and right folding portions 13 is provided at a position within 20 mm from the fold line 18 in the folding portion 13, it is easy to secure a region 13a where the water-soluble binder 19 is not provided on the tip side (the side separated from the fold line 18) of the left and right folding portions 13. Since the region 13a where the water-soluble binder 19 is not provided is provided on the tip side of the left and right folding portions 13, when removing the absorbent sheet 10 from the absorbent article 2, the region 13a where the water-soluble binder 19 is not provided can be gripped, and sticking of fingers due to the water-soluble binder 19 can be prevented.

[0052] Also, since the water-soluble binder 19 provided in the left and right folding portions 13 is provided at a position within 20 mm from the fold line 18 in the folding portion 13, unlike the case where the water-soluble binder 19 is provided on the tip side of the left and right folding portions 13, the body fluid is likely to hit the water-soluble binder 19 when the absorbent sheet 10 absorbs the body fluid. Therefore, since the water-soluble binder 19 can be dissolved by the body fluid, the absorbent sheet 10 can be easily removed from the absorbent article 2.

[0053] Also, the left and right adhesion regions 17a of the non-skin surface side sheet 17 of the absorbent sheet body 12 have water permeability, and the water-repellent region 17b at the center in the width direction of the non-skin surface side sheet 17 is subjected to a water-repellent treatment. Therefore, as shown by the white arrow in FIG. 2, the body fluid absorbed from the skin surface side of the absorbent sheet body 12 hardly moves to the absorbent article 2 side from the water-repellent region 17b at the center in the width direction of the non-skin surface side sheet 17 and moves to both sides in the width direction. For this reason, since the body fluid can be guided to the adhesion regions 17a on both sides in the width direction of the non-skin surface side sheet 17, the water-soluble binder 14 can be surely dissolved by a large amount of body fluid, and the absorbent sheet 10 can be easily removed from the absorbent article 2.

[0054] Further, the water-repellent region 17b at the center in the width direction of the non-skin surface side sheet 17 of the absorbent sheet body 12 is subjected to a water-repellent treatment. Body fluids absorbed from the skin surface side of the absorbent sheet body 12 are difficult to move from the water-repellent region 17b at the center in the width direction of the non-skin surface side sheet 17 to the absorbent article 2 side. Therefore, after removing the absorbent sheet 10 from the absorbent article 2, the region at the center in the width direction of the absorbent article 2 can be in a state where body fluids are not absorbed, and a dry surface state can be created in the region at the center in the width direction of the absorbent article 2. Thus, a state suitable for repeated absorption can be ensured.

[0055] Also, when body fluids are absorbed with the absorbent sheet 10 attached to the absorbent article 2, the body fluids are absorbed by the absorbent sheet body 12 of the absorbent sheet 10 and the regions on both sides in the width direction of the absorbent article 2 (the regions below (non-skin surface side) the water-soluble binder 14), and are difficult to be absorbed in the region at the center in the width direction of the absorbent article 2. Since the absorbent body 5 of the absorbent article 2 contains the superabsorbent polymer 7, the superabsorbent polymer 7 in the regions on both sides in the width direction of the absorbent article 2 swells, and the superabsorbent polymer 7 in the region at the center in the width direction of the absorbent article 2 does not swell. Therefore, the cross-sectional shape of the absorbent article 2 in the width direction is a shape in which the central portion in the width direction is recessed toward the non-skin surface side (hereinafter referred to as a "recess"). After removing the absorbent sheet 10, the excretory part of the wearer comes into contact with the recess of the absorbent article 2. Thereby, the recess of the absorbent article 2 functions like an absorbent body slit, and lateral leakage of body fluids can be prevented.

[0056] As described above, according to the present embodiment, it is possible to achieve both leakage prevention of the absorbent sheet 10 and the compatibility of the mounting property and the disposability of the absorbent sheet 10 with respect to the absorbent article 2.

[0057] Next, a second embodiment of the present invention will be described with reference to the drawings. The absorbent sheet 20 of the present embodiment is different from the first embodiment in that a water-impermeable film 23 is provided on the non-skin surface side sheet 22. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[0058] FIG. 5 is a cross-sectional view of the absorbent sheet 20 according to the second embodiment of the present invention, where (a) shows the stored state and (b) shows the unfolded state. In FIG. 5(a), for clarity, the fold line 18 is illustrated with black dots. In FIG. 5(b), the absorbent sheet 20 is in the unfolded state, the release paper 15 is removed from the absorbent sheet body 12 side, the absorbent sheet body 12 is adhered to the top sheet 3 of the absorbent article 2 with the water-soluble binder 14, and the left and right folded-back portions 13 are adhered to the left and right gathers 6c of the absorbent article 2 with the water-soluble binder 19.

[0059] As shown in FIG. 5(a), the absorbent sheet 20 according to the present embodiment, similar to the absorbent sheet 10 of the first embodiment, includes an absorbent sheet body 12 containing a superabsorbent polymer 11, left and right folded-back portions 13 provided on both sides in the width direction of the absorbent sheet body 12, and a release paper 15 adhered by a water-soluble binder 14 on the non-skin surface side of the absorbent sheet body 12.

[0060] The absorbent sheet body 12 has a skin surface side sheet 21 disposed on the skin surface side, a non-skin surface side sheet 22 disposed on the non-skin surface side facing the skin surface side sheet 21, and a superabsorbent polymer 11 provided between the skin surface side sheet 21 and the non-skin surface side sheet 22, and is formed in a sheet shape. Thereby, the superabsorbent polymer 11 has a structure sandwiched between the skin surface side sheet 21 and the non-skin surface side sheet 22. The skin surface side sheet 21 and the non-skin surface side sheet 22 have a structure in which the peripheries of the superabsorbent polymer 11 of both sheets 21, 22 are joined to each other so that the superabsorbent polymer 11 does not spill out, similar to the skin surface side sheet 16 and the non-skin surface side sheet 17 of the first embodiment. The central portion 21a of the skin surface side sheet 21 functions as a part of the absorbent sheet body 12, and both end portions 21b in the width direction of the skin surface side sheet 21 function as the left and right folded-back portions 13.

[0061] The skin surface side sheet 21 of the absorbent sheet body 12 is formed of a non-woven fabric having water permeability (liquid permeability) such that body fluid from the skin surface side moves to the superabsorbent polymer 11, similar to the skin surface side sheet 16 of the first embodiment.

[0062] The non-skin-side sheet 22 of the absorbent sheet body 12 is a sheet formed of a water-permeable non-woven fabric, and has an adhesion region 22a at both outer ends in the width direction and a central region 22b between the left and right adhesion regions 22a. In the present embodiment, the length of the non-skin-side sheet 22 in the width direction is substantially the same as the length of the absorbent sheet body 12 in the width direction. That is, the left and right adhesion regions 22a of the non-skin-side sheet 22 are provided at both ends of the absorbent sheet body 12 in the width direction. The left and right adhesion regions 22a of the non-skin-side sheet 22 are regions that are adhered to the top sheet 3 of the absorbent article 2 during use (see FIG. 5(b)), extend in the longitudinal direction at both ends of the absorbent sheet body 12 in the width direction, and have water permeability. A water-soluble binder 14 is provided along the longitudinal direction on the non-skin-side surface of the left and right adhesion regions 22a of the non-skin-side sheet 22, and a release paper 15 is adhered thereto as in the first embodiment. A water-impermeable (liquid-impermeable) water-impermeable film 23 is adhered to the non-skin side of the central region 22b of the non-skin-side sheet 22. In addition, a water-repellent treatment may be performed on the central region 22b of the non-skin-side sheet 22 in addition to the water-impermeable film 23 as in the first embodiment.

[0063] The water-impermeable film 23 may be a resin film, and examples thereof include polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene.

[0064] The left and right folded-back portions 13 are constituted by both end portions 21b in the width direction of the skin-side sheet 21. The left and right folded-back portions 13 in the stored state are folded back along the fold line 18 extending in the longitudinal direction and adhered to the release paper 15 with the water-soluble binder 19 as in the first embodiment.

[0065] In the absorbent sheet 20 configured as described above, as in the first embodiment, it is possible to achieve leakage prevention of the absorbent sheet 20 and coexistence of the mountability and disposability of the absorbent sheet 20 with respect to the absorbent article 2.

[0066] Further, since the water-impermeable film 23 is adhered to the non-skin surface side of the central region 22b of the non-skin surface side sheet 22 of the absorbent sheet body 12, the body fluid from the skin surface side of the absorbent sheet body 12 is guided along the water-impermeable film 23 to both sides in the width direction of the absorbent sheet body 12. Therefore, the water-soluble binder 14 can be surely dissolved by a large amount of body fluid guided to both sides in the width direction of the absorbent sheet body 12, and the absorbent sheet 20 can be easily removed from the absorbent article 2.

[0067] Also, the water-impermeable film 23 is adhered to the non-skin surface side of the central region 22b of the non-skin surface side sheet 22 of the absorbent sheet body 12, and the body fluid from the skin surface side of the absorbent sheet body 12 is guided to both sides in the width direction of the absorbent sheet body 12, so that the movement of the body fluid to the center in the width direction of the absorbent article 2 can be suppressed. Therefore, after the absorbent sheet 20 is removed from the absorbent article 2, the region in the center in the width direction of the absorbent article 2 can be kept in a state where the body fluid is not absorbed, and a dry surface state can be created in the region in the center in the width direction of the absorbent article 2, so that a state suitable for repeated absorption can be ensured.

[0068] Also, when the absorbent sheet 20 absorbs body fluid in a state of being attached to the absorbent article 2, the body fluid is absorbed by the absorbent sheet body 12 of the absorbent sheet 20 and the regions on both sides in the width direction of the absorbent article 2 (the regions below (non-skin surface side) the water-soluble binder 14), and it is difficult to be absorbed in the region in the center in the width direction of the absorbent article 2. Since the absorber 5 of the absorbent article 2 contains the superabsorbent polymer 7, the superabsorbent polymer 7 in the regions on both sides in the width direction of the absorbent article 2 swells, and the superabsorbent polymer 7 in the region in the center in the width direction of the absorbent article 2 does not swell. Therefore, the cross-sectional shape of the absorbent article 2 in the width direction becomes a shape in which the central portion in the width direction is recessed toward the non-skin surface side (hereinafter referred to as "recess").) After the absorbent sheet 20 is peeled off, the excretory part of the wearer comes into contact with the recess of the absorbent article 2. Thereby, the recess of the absorbent article 2 functions like an absorber slit, and lateral leakage of body fluid can be prevented.

[0069] In this embodiment, the water-impermeable (liquid-impermeable) water-impermeable film 23 is provided on the non-skin surface side of the central region 22b of the non-skin surface side sheet 22 of the absorbent sheet body 12, but it may be provided on the skin surface side of the central region 22b of the non-skin surface side sheet 22. Alternatively, the water-impermeable film 23 may be provided on both sides (both the skin surface side and the non-skin surface side) of the central region 22b of the non-skin surface side sheet 22 of the absorbent sheet body 12.

[0070] Next, a third embodiment of the present invention will be described with reference to the drawings. The absorbent sheet 30 of this embodiment is different from the first embodiment in that the non-skin surface side sheet 32 is composed of a water-impermeable film. For the same configurations as those in the first embodiment, the same reference numerals are given and the description thereof is omitted.

[0071] FIG. 6 is a cross-sectional view of the absorbent sheet 30 according to the third embodiment of the present invention, where (a) shows the stored state and (b) shows the unfolded state. In FIG. 5(a), for clarity, the fold line 18 is illustrated with black dots. In FIG. 6(b), the absorbent sheet 30 is in the unfolded state, the release paper 15 is removed from the absorbent sheet body 12 side, the absorbent sheet body 12 is adhered to the top sheet 3 of the absorbent article 2 with the water-soluble binder 14, and the left and right folded-back portions 13 are adhered to the left and right gathers 6c of the absorbent article 2 with the water-soluble binder 19.

[0072] As shown in FIG. 6(a), the absorbent sheet 30 according to this embodiment includes, similarly to the absorbent sheet 10 of the first embodiment, an absorbent sheet body 12 containing a superabsorbent polymer 11, left and right folded-back portions 13 provided on both sides in the width direction of the absorbent sheet body 12, and a release paper 15 adhered to the non-skin surface side of the absorbent sheet body 12 by a water-soluble binder 14.

[0073] The absorbent sheet body 12 has a skin-side sheet 31 disposed on the skin side, a non-skin-side sheet 32 disposed on the non-skin side facing the skin-side sheet 31, and a superabsorbent polymer 11 provided between the skin-side sheet 31 and the non-skin-side sheet 32, and is formed in a sheet shape. Thus, the superabsorbent polymer 11 has a structure sandwiched between the skin-side sheet 31 and the non-skin-side sheet 32. The skin-side sheet 31 and the non-skin-side sheet 32 have a structure in which the peripheries of the superabsorbent polymer 11 of both sheets 31, 32 are joined to each other so that the superabsorbent polymer 11 does not spill out, similar to the skin-side sheet 16 and the non-skin-side sheet 17 of the first embodiment. The central portion 31a of the skin-side sheet 31 functions as a part of the absorbent sheet body 12, and both end portions 31b in the width direction of the skin-side sheet 31 function as left and right folded-back portions 13.

[0074] The skin-side sheet 31 of the absorbent sheet body 12 is formed of a non-woven fabric having water permeability (liquid permeability) such that body fluid from the skin side moves to the superabsorbent polymer 11, similar to the skin-side sheet 16 of the first embodiment.

[0075] The non-skin-side sheet 32 of the absorbent sheet body 12 is a sheet formed of a non-water-permeable (liquid-impermeable) non-water-permeable film, and the length L3 in the width direction of the non-skin-side sheet 32 is shorter than the length L4 in the width direction of the skin-side sheet 31. The non-skin-side sheet 32 has adhesive regions 32a at both outer end portions on both sides in the width direction. The left and right adhesive regions 32a of the non-skin-side sheet 32 are regions that are adhered to the top sheet 3 of the absorbent article 2 during use (see Fig. 6(b)), extend in the longitudinal direction at both end portions in the width direction of the absorbent sheet body 12, and have water permeability. A water-soluble binder 14 is provided along the longitudinal direction on the non-skin-side surface of the left and right adhesive regions 32a of the non-skin-side sheet 32, and a release paper 15 is adhered thereto as in the first embodiment. The non-water-permeable film constituting the non-skin-side sheet 32 may be a resin film, and examples thereof include a polyester, a polyvinyl alcohol, a polyethylene, a polypropylene, and a composite film of polyethylene and polypropylene.

[0076] The left and right folding parts 13 are constituted by both end parts 31b in the width direction of the skin-side sheet 31. Similar to the first embodiment, the left and right folding parts 13 in the stored state are folded along a fold line 18 extending in the longitudinal direction and adhered to the release paper 15 with a water-soluble binder 19.

[0077] In the absorbent sheet 30 configured as described above, similar to the first embodiment, it is possible to achieve leakage prevention of the absorbent sheet 30 and the coexistence of the wearability and disposability of the absorbent sheet 30 with respect to the absorbent article 2.

[0078] Also, since the non-skin-side sheet 32 of the absorbent sheet main body 12 is formed of a non-water-permeable film, the body fluid absorbed from the skin side of the absorbent sheet main body 12 is guided to both sides in the width direction on the skin side of the non-skin-side sheet 32. Further, since the length L3 in the width direction of the non-skin-side sheet 32 is shorter than the length L4 in the width direction of the skin-side sheet 31, the water-soluble binder 14 can be disposed outside the non-skin-side sheet 32 in the width direction. For this reason, the water-soluble binder 14 can be dissolved by a large amount of body fluid guided to the adhesion regions 32a on both sides in the width direction of the non-skin-side sheet 32, so that the absorbent sheet 30 can be easily removed from the absorbent article 2. Since the length L3 in the width direction of the non-skin-side sheet 32 is shorter than the length L4 in the width direction of the skin-side sheet 31, the joining between the skin-side sheet 31 and the non-skin-side sheet 32 that sandwiches the superabsorbent polymer 11 is performed between the region around the non-skin-side sheet 32 (non-water-permeable film) and the region of the skin-side sheet 31 facing it. At this time, although not shown, the water-soluble binder 14 is preferably disposed on the non-skin side of the skin-side sheet 31. By disposing the water-soluble binder 14 at this position, the movement of the body fluid can be promoted so as to move downward to the absorbent article 2 through this region, so that the water-soluble binder 14 can be dissolved by a large amount of body fluid, and the ease of removing the absorbent sheet 30 from the absorbent article 2 can be improved.

[0079] In addition, since the non-skin surface side sheet 32 of the absorbent sheet body 12 is formed of a non-water-permeable film, the body fluid absorbed from the skin surface side of the absorbent sheet body 12 does not pass through the non-skin surface side sheet 32 and move to the absorbent article 2 side. Therefore, after removing the absorbent sheet 30 from the absorbent article 2, the region at the center in the width direction of the absorbent article 2 can be made in a state where the body fluid is not absorbed, and a dry surface state can be created in the region at the center in the width direction of the absorbent article 2. Thus, a state suitable for repeated absorption can be ensured.

[0080] Also, when the body fluid is absorbed with the absorbent sheet 30 attached to the absorbent article 2, the body fluid is absorbed by the absorbent sheet body 12 of the absorbent sheet 30 and the regions on both sides in the width direction of the absorbent article 2 (the regions below (non-skin surface side) the water-soluble binder 14), and it is difficult to be absorbed in the region at the center in the width direction of the absorbent article 2. Since the absorber 5 of the absorbent article 2 contains the superabsorbent polymer 7, the superabsorbent polymer 7 in the regions on both sides in the width direction of the absorbent article 2 swells, and the superabsorbent polymer 7 in the region at the center in the width direction of the absorbent article 2 does not swell. For this reason, the cross-sectional shape in the width direction of the absorbent article 2 becomes a shape in which the central portion in the width direction is recessed toward the non-skin surface side (hereinafter referred to as a "recess"). Therefore, after removing the absorbent sheet 30, the wearer's excretion part comes into contact with the recess of the absorbent article 2. Thereby, the recess of the absorbent article 2 functions like an absorber slit, and lateral leakage of the body fluid can be prevented.

[0081] Next, a fourth embodiment of the present invention will be described with reference to the drawings. In the absorbent sheet 40 of the present embodiment, the arrangement position of the superabsorbent polymer 11 is different from that in the first embodiment. Regarding the same configuration as that in the first embodiment, the same reference numerals are given and the description thereof is omitted.

[0082] FIG. 7 is a plan view of the absorbent sheet 40 according to the fourth embodiment of the present invention. FIG. 8 is a cross-sectional view of the absorbent sheet 40 according to the fourth embodiment of the present invention, where (a) shows a cross-section taken along the arrow VIII(a)-VIII(a) in FIG. 7, and (b) shows the state after absorption of body fluid during use. In FIG. 8(a), for clarity, the fold line 18 is illustrated as black dots. In FIG. 8(b), the absorbent sheet 40 is in a deployed state, the release paper 15 is removed from the side of the absorbent sheet body 12, the absorbent sheet body 12 is adhered to the top sheet 3 of the absorbent article 2 with the water-soluble binder 14, and the left and right folded-back portions 13 are adhered to the left and right gathers 6c of the absorbent article 2 with the water-soluble binder 19.

[0083] As shown in FIGS. 7 and 8(a), the absorbent sheet 40 according to the present embodiment, similar to the absorbent sheet 10 of the first embodiment, includes an absorbent sheet body 12 containing a superabsorbent polymer 11, left and right folded-back portions 13 provided on both sides in the width direction of the absorbent sheet body 12, and a release paper 15 adhered by a water-soluble binder 14 to the non-skin surface side of the absorbent sheet body 12.

[0084] The absorbent sheet body 12 has a skin surface side sheet 16 disposed on the skin surface side, a non-skin surface side sheet 17 disposed on the non-skin surface side facing the skin surface side sheet 16, and a superabsorbent polymer 11 provided between the skin surface side sheet 16 and the non-skin surface side sheet 17, and is formed in a sheet shape. The absorbent sheet body 12 has a plurality (three in this embodiment) of polymer presence regions 41 where the superabsorbent polymer 11 exists and a polymer non-existence region 42 where the superabsorbent polymer 11 does not exist. The plurality of polymer presence regions 41 extend in the longitudinal direction while being spaced apart from each other in the width direction. The polymer non-existence region 42 is a region sandwiched between the plurality of polymer presence regions 41 and extends in the longitudinal direction. That is, the polymer presence regions 41 and the polymer non-existence region 42 each extend in the longitudinal direction and are alternately arranged with each other in the width direction. The skin surface side sheet 16 and the non-skin surface side sheet 17 of the polymer non-existence region 42 are fixed to each other. Note that the number of the plurality of polymer presence regions 41 is not limited to three.

[0085] In the absorbent sheet 40 configured as described above, similarly to the first embodiment, it is possible to achieve both leakage prevention of the absorbent sheet 40 and coexistence of the mountability and disposability of the absorbent sheet 40 with respect to the absorbent article 2.

[0086] Further, since the plurality of polymer presence regions 41 extend in the longitudinal direction while being spaced apart from each other in the width direction, it is possible to promote the diffusion of body fluid in the longitudinal direction during repeated absorption of body fluid.

[0087] Moreover, since it has a plurality of polymer presence regions 41 extending in the longitudinal direction while being spaced apart from each other in the width direction, unlike the case where one polymer presence region 41 is provided over the entire area of the absorbent sheet body 12, even when a small amount of body fluid is absorbed, the polymer presence region 41 can be swollen in the thickness direction (the direction along the symbol Z) of the absorbent sheet body 12. As shown in FIG. 8(b), when the polymer presence region 41 swells in the thickness direction of the absorbent sheet body 12, a force in the direction of separating from the top sheet 3 of the absorbent article 2 acts on the adhesion region 17a of the non-skin surface side sheet 17, so that the absorbent sheet 40 can be removed from the absorbent article 2 more easily. It is preferable to dispose the water-soluble binder 14 in a region that does not overlap with the polymer presence region 41 (superabsorbent polymer 11) in the thickness direction, and it is more preferable to dispose it only in a region that does not overlap with the polymer presence region 41 (superabsorbent polymer 11) in the thickness direction. Thereby, the swelling force of the polymer presence region 41 after water absorption can be effectively exerted as a force for separating the water-soluble binder 14 of the absorbent sheet 40 from the top sheet 3, so that the ease of removing the absorbent sheet 40 from the absorbent article 2 can be further enhanced.

[0088] In addition, in the above-described first to fourth embodiments, both end portions 16b, 21b, 31b in the width direction of the skin-side sheets 16, 21, 31 are made to function as the left and right folding portions 13, but the present invention is not limited thereto. For example, the non-skin-side sheets 17, 22, 32 may be extended to both sides in the width direction, and the extended regions may be made to function as the left and right folding portions 13. Alternatively, a sheet separate from the absorbent sheet body 12 may be fixed to both sides in the width direction of the absorbent sheet body 12, and such a sheet (a sheet separate from the absorbent sheet body 12) may be made to function as the left and right folding portions 13.

[0089] Further, in the above-described first to fourth embodiments, one release paper 15 is disposed between the absorbent sheet body 12 and the left and right folding portions 13, and both end portions in the width direction of the one release paper 15 are adhered to the absorbent sheet body 12 with the water-soluble binder 14. However, the present invention is not limited thereto. For example, a pair of release papers 15 may be provided and adhered to each of the water-soluble binders 14 on both sides in the width direction of the absorbent sheet body 12.

[0090] Moreover, in the above-described first to fourth embodiments, the water-soluble binder 19 is provided on the left and right folding portions 13 and adhered to the release paper 15. However, the present invention is not limited thereto. For example, without providing the water-soluble binder 19 on the left and right folding portions 13, the left and right folding portions 13 may be simply folded from the fold line 18 side to the inside in the width direction of the absorbent sheet body 12. In this case, the left and right folding portions 13 may be folded toward the skin side of the absorbent sheet body 12.

[0091] Also, in the above-described first to fourth embodiments, the length in the width direction of the left and right folding portions 13 is set to be 10 mm or more and 80 mm or less, but the present invention is not limited thereto.

[0092] Furthermore, in the above-described first to fourth embodiments, the water-soluble binder 19 provided on the left and right folding portions 13 is provided at a position within 20 mm from the fold line 18, but the position where the water-soluble binder 19 is provided is not limited thereto.

[0093] Also, in the above-described first to fourth embodiments, the left and right folding portions 13 are not provided with a superabsorbent polymer, but a superabsorbent polymer may be provided on the left and right folding portions 13.

[0094] Also, in the above-described first to fourth embodiments, the water-soluble binder 14 is provided at both ends in the width direction of the absorbent sheet main body 12, but the position where the water-soluble binder 14 is provided is not limited to this.

[0095] As described above, the present invention has been described based on the above embodiments, but the present invention is not limited to the contents of the above embodiments, and can be appropriately changed without departing from the scope of the present invention. That is, other embodiments, examples, operation techniques, etc. made by those skilled in the art based on this embodiment are of course all included in the scope of the present invention.

Explanation of Reference Numerals

[0096] 1, 10, 20, 30, 40: Absorbent sheet 11: Superabsorbent polymer 12: Absorbent sheet main body 13: Folding portion 14: Water-soluble binder (first water-soluble binder) 15: Release paper 16, 21, 31: Skin-side sheet 17, 22, 32: Non-skin-side sheet 18: Fold 19: Water-soluble binder (second water-soluble binder) 23: Non-water-permeable film 41: Polymer presence region 42: Polymer non-presence region

Claims

1. An absorbent sheet body that extends in the longitudinal direction and contains a superabsorbent polymer, Folding portions located on both sides in the width direction that intersects the longitudinal direction of the absorbent sheet body, and folded back from both ends in the width direction of the absorbent sheet body to the non-skin side through folds that extend in the longitudinal direction, A release paper disposed between the folded-back folding portion and the absorbent sheet body, and adhered to at least the absorbent sheet body with a first water-soluble binder provided on the absorbent sheet body side, The first water-soluble binder is provided at both ends in the width direction of the absorbent sheet body, The length in the width direction of the folding portion is 10 mm or more and 80 mm or less, The absorbent sheet body has a skin-side sheet on the skin side that sandwiches the superabsorbent polymer and a non-skin-side sheet on the non-skin side, The skin-side sheet and the non-skin-side sheet are water-permeable non-woven fabrics, The central portion in the width direction of the non-skin-side sheet is subjected to a water-repellent treatment, The release paper is adhered to the folded-back folding portion with a second water-soluble binder, The second water-soluble binder is provided at a position within 20 mm from the fold in the folding portion An absorbent sheet, characterized by the above.

2. The folding portion is not provided with a superabsorbent polymer The absorbent sheet according to claim 1, characterized by the above.

3. The absorbent sheet body has a polymer presence region where the superabsorbent polymer exists and a polymer non-existence region where the superabsorbent polymer does not exist, The polymer presence region and the polymer non-existence region each extend in the longitudinal direction and are alternately arranged with each other in the width direction The absorbent sheet according to claim 1 or 2, characterized by the above.

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