CN111374832B

CN111374832B - Absorbent article

Info

Publication number: CN111374832B
Application number: CN201811653899.1A
Authority: CN
Inventors: 丹下悟; 高居义; 柏木政浩
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2018-12-29
Filing date: 2018-12-29
Publication date: 2022-12-30
Anticipated expiration: 2038-12-29
Also published as: JP2020108745A; JP6847188B2; WO2020137429A1; CN111374832A

Abstract

Provided is an absorbent article having excellent repeated absorbency. An absorbent article (1) comprising a liquid-permeable sheet (12), a liquid-impermeable sheet (13), and an absorbent body (14), wherein the absorbent body comprises an intermediate layer (43) and an absorbent layer (42) comprising a highly water-absorbent polymer in the thickness direction (T), and the absorbent body is divided in the width direction (W) into a width-direction central region (W) including a longitudinal Center Line (CL) _C ) And a pair of widthwise adjacent regions (W) adjacent to the widthwise central region _A ) The intermediate layer has a1 st sheet portion (43 a) distant from the absorbent layer and a2 nd sheet portion (43 b) close to the absorbent layer, the 1 st sheet portion being in contact with the absorbent layer in a widthwise central region and not being connected to a member existing on the liquid-impermeable sheet side of the 1 st sheet portion in a pair of widthwise adjacent regions, the 2 nd sheet portion being in contact with the absorbent layer in the pair of widthwise adjacent regions.

Description

Absorbent article

Technical Field

The present disclosure relates to an absorbent article.

Background

An absorbent article is known which has an absorbent body including a1 st absorbent layer containing a super absorbent polymer, a2 nd absorbent layer containing a super absorbent polymer, and a fabric layer disposed between the 1 st absorbent layer and the 2 nd absorbent layer.

For example, patent document 1 describes a water-absorbent sheet having a structure in which an absorbent layer containing a water-absorbent resin and an adhesive is sandwiched between hydrophilic nonwoven fabrics, wherein the water-absorbent sheet has the following structure: the absorptive layer is divided into 1 times absorptive layer and 2 times absorptive layer by a base material layer, the base material layer is formed by bonding and laminating more than two layers of base materials with air permeability by using bonding agents, the base material layer satisfies the following conditions (1) to (2), (1) the basis weight of the base material layer is 25g/m ² Above, and (2) the air-permeable sheetBetween the substrates 0.1g/m ² ～50g/m ² The amount of the adhesive is the same as the amount of the adhesive.

Documents of the prior art

Patent document

Patent document 1: international publication pamphlet No. 2010/143635

Disclosure of Invention

Problems to be solved by the invention

In the water-absorbent sheet (absorbent body) described in patent document 1, the base material layer has (i) a function of temporarily storing the liquid that has reached the water-absorbent sheet (absorbent body) due to a deterioration in the absorption rate of the liquid by the water-absorbent resin (superabsorbent polymer), and (ii) a function of suppressing a decrease in the absorption of the water-absorbent sheet (absorbent body) or an absorbent article including the water-absorbent sheet due to the tendency of the water-absorbent resin (superabsorbent polymer) to lump.

On the other hand, the water-absorbent sheet (absorbent body) described in patent document 1 tends to have a difficulty in securing a space for the water-absorbent resin (superabsorbent polymer) to swell when repeatedly absorbing liquid, and tends to have poor repeated absorbency.

Accordingly, an object of the present disclosure is to provide an absorbent article having excellent repeated absorbency.

Means for solving the problems

The present disclosure proposes an absorbent article including a liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent body between the liquid-permeable sheet and the liquid-impermeable sheet, having a longitudinal direction, a width direction, and a thickness direction, wherein the absorbent body includes an intermediate layer and an absorbent layer including a super absorbent polymer in the thickness direction, the absorbent body is divided into a width direction central region including a longitudinal direction center line of the absorbent article and a pair of width direction adjacent regions adjacent to the width direction central region in the width direction, the intermediate layer includes a1 st sheet portion distant from the absorbent layer and a2 nd sheet portion close to the absorbent layer, the 1 st sheet portion is in contact with the absorbent layer in the width direction central region, and is not connected to a member present on the liquid-impermeable sheet side of the 1 st sheet portion in the pair of width direction adjacent regions, and the 2 nd sheet portion is in contact with the absorbent layer in the pair of width direction adjacent regions.

ADVANTAGEOUS EFFECTS OF INVENTION

The absorbent article of the present disclosure is excellent in repeated absorbency.

Drawings

Fig. 1 is a front view of a pants-type diaper 1 according to embodiment 1 in an unfolded state.

Fig. 2 is a rear view of the pants-type diaper 1 in an unfolded state.

Fig. 3 is a cross-sectional view of the pants-type diaper 1 along the line III-III of fig. 1.

Fig. 4 is a cross-sectional view of the absorbent body 14 taken along the line III-III in fig. 1.

Fig. 5 is a diagram for explaining the absorbent body 14.

Fig. 6 is a diagram for explaining the absorbent body 14.

Fig. 7 is a diagram for explaining the absorbent body 14.

Fig. 8 is a diagram for explaining the pants-type diaper according to embodiment 2.

Description of the reference numerals

1: pants-type diaper, 2: ventral portion (ventral waistband), 3: dorsal part (dorsal waistband), 4: crotch portion, 5a, 5b: cover sheet, 10: absorbent main body, 12: liquid-permeable sheet, 13: liquid-impermeable sheet, 14: absorber, 41: 1 st absorption layer, 42: 2 nd absorption layer, 42a: 2 nd absorption layer center portion, 42b: adjacent part of No. 2 absorption layer, 43: intermediate layer, 43S: intermediate sheet, 43a: 1 st piece portion, 43b: sheet 2 portion, 43c: embossing part, 44: 1 st substrate, 45: 1 st water absorbent material, 46: 2 nd substrate, 47: no. 2 water-absorbing material, 48: channel, 61: elastic member, 101: void, 103, 104: folding axis, L: length direction, W: width direction, T: thickness direction, CL: longitudinal centerline, CW: width-direction center line, LB: low area weight region, HB: region of high basis weightOP: overlap, NP: non-overlapping portion, W _C : central region in the width direction, W _A : adjacent regions in the width direction.

Detailed Description

Specifically, the present disclosure relates to the following technical solutions.

[ solution 1]

An absorbent article comprising a liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent body between the liquid-permeable sheet and the liquid-impermeable sheet, having a longitudinal direction, a width direction, and a thickness direction,

the absorbent body comprises an intermediate layer and an absorbent layer comprising a super absorbent polymer in the thickness direction,

the absorber is divided in the width direction into a width direction central region including a longitudinal direction center line of the absorbent article and a pair of width direction adjacent regions adjacent to the width direction central region,

the intermediate layer is provided with a1 st sheet portion remote from the absorbent layer and a2 nd sheet portion adjacent to the absorbent layer,

the 1 st sheet portion is in contact with the absorbent layer in the widthwise central region and is not joined to a member present on the liquid-impermeable sheet side of the 1 st sheet portion in the pair of widthwise adjacent regions,

the 2 nd sheet portion is in contact with the absorbent layer at the pair of widthwise adjacent regions.

In the absorbent article described above, the 1 st sheet portion is in contact with the absorbent layer in the widthwise central region, and is not connected to the member present on the liquid-impermeable sheet side of the 1 st sheet portion in the pair of widthwise adjacent regions, and the 2 nd sheet portion is in contact with the absorbent layer in the pair of widthwise adjacent regions, so that in a case where a portion of the absorbent layer corresponding to the widthwise central region (hereinafter referred to as "widthwise central portion") absorbs liquid and the widthwise central portion of the absorbent layer bulges in the thickness direction, the 1 st sheet portion bulges, and the 1 st sheet portion and the 2 nd sheet portion are separated from each other, and a space can be formed therebetween.

Next, when the absorbent article repeatedly absorbs liquid, the intermediate layer temporarily stores the liquid and diffuses the liquid from the widthwise central region to the pair of widthwise adjacent regions, and the liquid is supplied to the absorbent layer in accordance with the necessity, the portions of the absorbent layer corresponding to the pair of widthwise adjacent regions (hereinafter referred to as "widthwise adjacent portions") can expand toward the gaps when absorbing the liquid and expanding, and therefore, the liquid absorbability of the absorbent article is not easily impaired. As described above, the absorbent article is excellent in repeated absorbency.

[ solution 2]

The absorbent article according to claim 1, wherein the 1 st sheet portion and the 2 nd sheet portion are formed of an integral intermediate sheet folded in the thickness direction at a predetermined folding axis.

In the above-described absorbent article, the 1 st sheet portion and the 2 nd sheet portion are formed by a predetermined integrated intermediate sheet, and therefore the above-described void is easily formed by the restoring force at the folding axis of the integrated intermediate sheet. Therefore, the absorbent article is excellent in repeated absorbability.

[ solution 3]

The absorbent article according to claim 1 or 2, wherein the intermediate layer is formed of an integrated intermediate sheet that is folded in the thickness direction at two folding axes that extend in the length direction and are separated from each other, and the 1 st sheet portion is disposed inside the two folding axes of the integrated intermediate sheet and the 2 nd sheet portion is disposed outside the two folding axes of the integrated intermediate sheet.

In the above-described absorbent article, the 1 st sheet portion and the 2 nd sheet portion are formed by a predetermined integrated intermediate sheet, and therefore the above-described void is easily formed by the restoring force at the two folding axes of the integrated intermediate sheet. Further, when a force that narrows in the width direction is applied to the absorbent article by the thighs of the wearer when the absorbent article is worn, a force that narrows in the width direction is also applied to the two folding axes, and the void is easily formed. Therefore, the absorbent article is excellent in repeated absorbability.

[ solution 4]

The absorbent article according to any one of claims 1 to 3, wherein the intermediate layer and an adjacent sheet adjacent to the liquid-permeable sheet side of the 1 st sheet portion each contain fibers, and the fibers constituting the 1 st sheet portion have a larger fiber diameter than the fibers constituting the adjacent sheet.

In the absorbent article, the diameter of the fiber constituting the 1 st sheet portion is larger than the diameter of the fiber constituting the adjacent sheet, so that the restoring force at the folding axis (both folding axes) of the integrated intermediate sheet is larger, the void is easily formed, and further, the repeated absorbency of the absorbent article is excellent.

[ solution 5]

The absorbent article according to any one of claims 1 to 4, wherein the intermediate layer is disposed on the liquid-permeable sheet side of the absorbent layer, and the absorbent body further includes an additional absorbent layer containing a super absorbent polymer on the liquid-permeable sheet side of the intermediate layer.

In the absorbent article, the absorbent body includes two absorbent layers (an absorbent layer and an additional absorbent layer) so as to sandwich the intermediate layer, and therefore, when liquid is repeatedly absorbed, the two absorbent layers can expand toward the void formed in the intermediate layer, and therefore, the absorbent article is less likely to hinder the liquid absorption. As described above, the absorbent article is excellent in repeated absorbency.

[ solution 6]

The absorbent article according to claim 5, wherein the absorbent layer includes a pair of channels in the widthwise central region, the pair of channels extending in the longitudinal direction and being separated in the widthwise direction.

In the absorbent article, the absorbent layer has the predetermined channel in the widthwise central portion, and therefore the liquid that has reached the absorbent layer is likely to remain between the pair of channels, and the widthwise central portion of the absorbent layer is likely to bulge, and the void is likely to be generated. Therefore, the absorbent article is excellent in repeated absorbability.

[ solution 7]

The absorbent article according to claim 5 or 6, wherein the end of the 2 nd sheet portion overlaps with the pair of channels in the thickness direction.

In the above absorbent article, the end portions of the 2 nd sheet portion overlap the pair of channels in the thickness direction.

The absorbent layer at the pair of channels has a relatively small weight per unit area as compared with the portions other than the pair of channels, and therefore in the case where the absorbent layer absorbs liquid and swells in the thickness direction, the pair of channels themselves are relatively less likely to swell in the thickness direction than the portions other than the pair of channels.

Thus, in the above-described absorbent article, when the absorbent layer absorbs liquid and swells (swells) in the thickness direction together with the 1 st sheet portion, the 2 nd sheet portion is less likely to swell in the thickness direction along with the swelling of the absorbent layer, and a void is more likely to be formed between the 1 st sheet portion and the 2 nd sheet portion. Therefore, the absorbent article is excellent in repeated absorbency.

[ solution 8]

The absorbent article according to any one of claims 5 to 7, wherein the 1 st sheet portion is in contact with the absorbent layer only between the pair of channels in the width direction.

In the absorbent article described above, the 1 st sheet portion is in contact with the absorbent layer only between the pair of channels, and therefore, when the widthwise central portion of the absorbent layer is raised, the 1 st sheet portion is reliably raised, and a gap is more likely to be generated between the 1 st sheet portion and the 2 nd sheet portion. Therefore, the absorbent article is excellent in repeated absorbability.

[ solution 9]

The absorbent article according to any one of claims 1 to 8, wherein the intermediate layer has a joint that partially joins a1 st sheet portion and a2 nd sheet portion at a position where the 1 st sheet portion and the 2 nd sheet portion overlap in the thickness direction.

In the absorbent article, the intermediate layer includes the predetermined joint portion, and therefore, even after the absorbent article repeatedly absorbs liquid, the absorbent body is not easily twisted.

[ solution 10]

The absorbent article according to claim 9, wherein the intermediate layer contains heat-fusible fibers, and the joint is an embossed section.

In the absorbent article, the joint portions are embossed portions, and therefore, even after the absorbent article repeatedly absorbs liquid, the absorbent body is not easily twisted.

The absorbent article of the present disclosure is described in detail below.

Fig. 1 to 7 are views for explaining an absorbent article, specifically, a pants-type diaper 1 according to one embodiment of the present disclosure (hereinafter, referred to as embodiment 1). Specifically, fig. 1 and 2 are a front view and a rear view of the pants-type diaper 1 in an unfolded state, respectively. Fig. 3 is a cross-sectional view of the pants-type diaper 1 along the line III-III of fig. 1. Fig. 4 is a cross-sectional view of the absorbent body 14 taken along the line III-III in fig. 1. FIG. 5 is a view for explaining the absorbent body 14, wherein FIG. 5 (a) is a plan view, and FIG. 5 (b) is a cross-sectional view taken along line Vb-Vb in FIG. 5 (a). Fig. 6 and 7 are diagrams for explaining a mechanism of the absorbent body 14 absorbing liquid. The drawings are schematic, and particularly, in fig. 3 to 7, the thickness in the thickness direction T is drawn thicker than the actual thickness for the convenience of understanding.

The pants-type diaper 1 has a longitudinal direction L, a width direction W, and a thickness direction T which are orthogonal to each other in the state shown in fig. 1, and has a longitudinal direction center line CL which passes through the center of the width direction W and extends in the longitudinal direction L, and a width direction center line CW which passes through the center of the length direction L and extends in the width direction W. The direction and the side close to the longitudinal center line CL are set as the inward direction and the inward side in the width direction W, respectively, and the direction and the side far from the longitudinal center line CL are set as the outward direction and the outward side in the width direction W, respectively. The direction and the side closer to the width direction center line CW are set as the inward direction and the inward side in the longitudinal direction L, respectively, and the direction and the side farther from the width direction center line CW are set as the outward direction and the outward side in the longitudinal direction L, respectively.

The side of the pants-type diaper 1 facing the end edge of the wearer corresponding to the abdomen (end edge on the abdomen side) in the longitudinal direction L is also referred to as the front side in the longitudinal direction L, and the side of the pants-type diaper 1 facing the end edge of the wearer corresponding to the back (end edge on the back side) is also referred to as the back side in the longitudinal direction L.

The "plan view" refers to the pants-type diaper 1 in a state where a plane including the longitudinal direction L and the width direction W is developed as viewed from above in the thickness direction T, and the "plan view" refers to a shape grasped in the plan view.

The "planar direction" is an arbitrary direction parallel to a plane including the width direction W and the length direction L.

The "skin side" and the "non-skin side" refer to a side relatively close to the skin surface of the wearer and a side far from the skin surface of the wearer in the thickness direction T, respectively, in a case where the pants-type diaper 1 is worn on the wearer.

These definitions apply not only to the pants-type diaper 1 but also to the absorber of the pants-type diaper 1 and the respective materials disposed thereon.

The member, structure, shape, and the like (hereinafter referred to as "member and the like") extend along the longitudinal direction L, and include not only a case where the member and the like are parallel to the longitudinal direction L, but also a case where the component Dx in the longitudinal direction L of the member and the like is larger than the component Dy in the width direction W of the member and the like (Dx > Dy). Similarly, the member or the like extends in the width direction W, and includes not only a case where the member or the like is parallel to the width direction W but also a case where the component Dy in the width direction W of the member or the like is larger than the component Dx in the longitudinal direction L of the member or the like (Dy > Dx). For a member or the like having a shape such as a curve or a curved surface (hereinafter referred to as "curve or the like"), the member or the like is evaluated as described above with respect to a tangent line at each point on the curve or the like.

As shown in fig. 1 and 2, the pants-type diaper 1 has a plane direction P and a thickness direction T that are orthogonal to each other, and the plane direction P includes a longitudinal direction L and a width direction W of the pants-type diaper 1.

The pants-type diaper 1 includes a stomach-side portion (stomach-side waistband) 2, a back-side portion (back-side waistband) 3, and an absorbent main body 10 positioned between the stomach-side portion 2 and the back-side portion 3 in the longitudinal direction L. In embodiment 1, the pants-type diaper 1 further includes a crotch portion 4 located between the abdomen-side portion 2 and the back-side portion 3. The abdomen portion 2 is a portion that abuts against the abdomen of the wearer. The back portion 3 is a portion that abuts against the hip or the back of the wearer. The absorbent body 10 is a portion that comes into contact with the crotch of the wearer, and has one end portion in the longitudinal direction L laminated on the stomach-side portion 2 and the other end portion laminated on the back-side portion 3. The crotch portion 4 is a portion that supports the absorbent main body 10 from the non-skin side.

The pants-type diaper 1 is formed by joining both

end portions

2a, 2a in the width direction W of the abdomen-side portion 2 and both

end portions

3a, 3a in the width direction W of the back-side portion 3 along the longitudinal direction L. In the pants-type diaper 1, a waist opening through which the waist of the wearer passes is defined by an outer end 2e of the stomach-side portion 2 in the longitudinal direction L and an outer end 3e of the back-side portion 3 in the longitudinal direction L. In the pants-type diaper 1, a pair of leg openings through which the legs of the wearer pass are defined by the

side portions

5e, 5e on both sides in the width direction W of the crotch portion 4. The abdomen-side portion (abdomen-side waistband) 2 and the back-side portion (back-side waistband) 3 can be said to be defined by the range of the longitudinal direction L in which the both

end portions

2a, 2a and the both

end portions

3a, 3a are joined.

In embodiment 1, in the state shown in fig. 1 and 2, each of the ventral portion 2 and the dorsal portion 3 has a rectangular shape that expands substantially in the width direction W and is separated from each other in the longitudinal direction L. The crotch portion 4 is located between the stomach portion 2 and the back portion 3, and both side edges in the width direction W are recessed inward in the width direction W. The stomach-side portion 2, the crotch portion 4, and the back-side portion 3 are integrally formed with each other. In another embodiment (not shown), the stomach-side portion 2, the crotch portion 4, and the back-side portion 3 are formed independently of each other. In another embodiment (not shown), the pants-type diaper 1 includes a front side portion 2 and a back side portion 3, and does not include a crotch portion 4.

In embodiment 1, the stomach portion 2, the back portion 3, and the crotch portion 4 are provided with liquid-impermeable cover sheets (sheet members) 5. The cover sheet 5 includes a cover sheet 5a on the skin side and a cover sheet 5b on the non-skin side. The cover sheet 5a and the cover sheet 5b are laminated in the thickness direction T and bonded to each other with an adhesive or the like. Both ends in the longitudinal direction L of the covering sheet 5b are folded back toward the skin side so as to cover both ends in the longitudinal direction L of the covering sheet 5 a. The portion of the cover sheet 5b at the folded position of the abdomen portion 2 constitutes the end portion 2e of the abdomen portion 2, and the portion of the cover sheet 5b at the folded position of the back portion 3 constitutes the end portion 3e of the back portion 3.

In embodiment 1, the abdomen-side portion 2 is provided with a plurality of

elastic members

6a, 6b for waist gather between the covering sheet 5a and the covering sheet 5b, and the back-side portion 3 is provided with a plurality of

elastic members

7a, 7b for waist gather between the covering sheet 5a and the covering sheet 5b. The plurality of

elastic members

6a and 6b are disposed inside and outside the abdominal portion 2 in the longitudinal direction L. The plurality of elastic members 6a are arranged at intervals in the longitudinal direction L along the width direction W in predetermined regions on both sides with respect to the longitudinal center line CL. The predetermined region is a region from the end portion 2a to a portion inside the end edge opposite in the width direction W of the absorbent main body 10. The plurality of elastic members 6b extend from the one end portion 2a to the other end portion 2a in the width direction W, and are arranged at intervals in the longitudinal direction L. Similarly, the plurality of

elastic members

7a and 7b are disposed inside and outside the back portion 3 in the longitudinal direction L.

The plurality of elastic members 7a are arranged in the longitudinal direction L along the width direction W in predetermined regions on both sides across the longitudinal center line CL at intervals from each other. The predetermined region is a region from the end portion 3a to a portion inside the end edge facing in the width direction W of the absorbent main body 10. The plurality of elastic members 7b extend from the one end portion 3a to the other end portion 3a in the width direction W and are arranged at intervals in the longitudinal direction L. The plurality of

elastic members

6a, 6b, 7a, and 7b are for extending and contracting the waist opening, and are exemplified by rubber bands. The abdomen-side portion (abdomen-side waistband) 2 and the back-side portion (back-side waistband) 3 may be defined by a range in the longitudinal direction L in which the plurality of

elastic members

6a, 6b, 7a, 7b are arranged.

In embodiment 1, the pants-type diaper 1 includes a plurality of elastic members 8 for leg gathers from the crotch portion 4 to the back portion 3 and the stomach portion 2. The plurality of elastic members 8 are provided extending in the longitudinal direction L mainly at both ends in the width direction W of the crotch portion 4. The plurality of elastic members 8 are for expanding and contracting the pair of leg openings, respectively, and are exemplified by rubber bands.

In embodiment 1, the absorbent main body 10 has a substantially rectangular shape, and includes a liquid-permeable sheet 12, a liquid-impermeable sheet 13, and an absorbent body 14 disposed between the liquid-permeable sheet 12 and the liquid-impermeable sheet 13 and absorbing and retaining liquid such as urine. Examples of the liquid-permeable sheet 12 include a liquid-permeable nonwoven fabric, a woven fabric, a synthetic resin film having liquid-permeable holes formed therein, and a composite sheet thereof. Examples of the liquid-impermeable sheet 13 include liquid-impermeable nonwoven fabrics, synthetic resin films, and composite sheets thereof, such as SMS nonwoven fabrics.

In embodiment 1, the absorbent body 14 includes an absorbent core for absorbing and retaining liquid and a core cladding that encloses the absorbent core. The absorbent body 14 will be described in detail later. The absorbent body 14, the liquid-permeable sheet 12, and the liquid-impermeable sheet 13 are bonded together with an adhesive, and the liquid-permeable sheet 12 and the liquid-impermeable sheet 13 are bonded together with an adhesive at their peripheral edge portions. Examples of the adhesive include materials known in pants-type diapers, for example, hot melt adhesives. The shape of the absorbent main body 10 is not limited to the above examples as long as it is long in the longitudinal direction L, and examples thereof include a rectangular shape with rounded corners, a rectangular shape with a short side being a curve protruding outward, and an hourglass shape. In another embodiment, the liquid-impermeable sheet 13 is omitted, and the non-skin side surface of the absorbent body 14 and the non-skin side surface of the peripheral portion of the liquid-permeable sheet 12 are joined to the cover sheet 5.

In embodiment 1, the absorbent main body 10 includes a pair of

side sheets

17 and 17 on the skin-side surface, which are positioned on both sides in the width direction W and extend in the longitudinal direction L. Each side sheet 17 has a leakage preventing wall 16 and

fastening regions

15, 15. The

fastening regions

15, 15 are positioned at the front and rear ends of the side sheet 17 in the longitudinal direction L and are fastened to the skin-side surface of the absorbent main body 10. The leakage preventing wall 16 is located between the front and

rear fastening regions

15, 15 in the longitudinal direction L of the side sheet 17, is adjacent to them, and fastens the outer end edge in the width direction W to the skin-side surface of the absorbent main body 10, and fastens the inner end edge in the width direction W. The leakage preventing walls 16 and the

fastening regions

15, 15 are formed by, for example, inner portions of the side sheets 17 in the width direction W, and outer portions of the side sheets 17 in the width direction W are fastened to the absorbent main body 10.

The pair of

leakage preventing walls

16, 16 are disposed so as to face each other at both end portions in the width direction W on the skin side of the absorbent main body 10, and extend continuously along the longitudinal direction L. Each of the leakage preventing walls 16 includes two elastic members 61 extending in the longitudinal direction L at inner ends in the width direction W. The elastic member 61 is exemplified as a rubber band. The pair of

leakage preventing walls

16, 16 are each formed of a hydrophobic sheet, such as a hydrophobic nonwoven fabric. In another embodiment, the pair of

leakage preventing walls

16, 16 are each formed of a hydrophilic sheet, such as a hydrophilic nonwoven fabric.

Next, the absorbent body 14 will be described with reference to fig. 1 to 5. The absorber 14 includes a1 st absorbent layer 41 disposed on the skin side, a2 nd absorbent layer 42 disposed on the non-skin side, and an intermediate layer 43 disposed between the 1 st absorbent layer 41 and the 2 nd absorbent layer 42. The absorbent body 14 has a substantially rectangular planar shape extending in the longitudinal direction L.

The absorber 14 is divided into widthwise central regions W including a lengthwise centerline CL of the pants-type diaper 1 in the widthwise direction W _C And a widthwise central region W _C A pair of adjacent regions W in the width direction _A . In addition, the central region W in the width direction of the 2 nd absorption layer 42 may be formed _C And a pair of widthwise adjacent regions W _A The regions overlapping in the thickness direction T are referred to as a2 nd absorption layer central portion 42a and a2 nd absorption layer adjacent portion 42b, respectively.

In embodiment 1, the 1 st absorbent layer 41 includes a1 st base 44 formed of a liquid-permeable sheet and a1 st absorbent material 45 having a water-absorbent material containing a water-absorbent polymer and disposed on the intermediate layer 43 side of the 1 st base 44. The 1 st absorbent layer 41 can be considered to have the 1 st absorbent material 45 as the absorbent core portion, with the 1 st substrate 44 (and intermediate layer 43) as the core cladding. The 1 st water absorbent material 45 is fixed to at least one of the 1 st base material 44 and the intermediate layer 43 by an adhesive applied to at least one of the surface of the 1 st base material 44 on the intermediate layer 43 side and the surface of the intermediate layer 43 on the 1 st base material 44 side.

The water absorbing material of the 1 st water absorbing material 45 is disposed in the 1 st absorbing layer 41 with a substantially uniform basis weight. The 1 st water absorbing material 45 has a substantially rectangular planar shape. The 1 st base material 44 has a substantially rectangular planar shape, and covers the 1 st absorbent material 45 from the skin side in plan view, and the peripheral edge portion of the 1 st base material 44 extends slightly outward from the periphery of the 1 st absorbent material 45.

In embodiment 1, the 2 nd absorbent layer 42 includes a2 nd base 46 formed of a sheet having water retentivity and liquid diffusibility, and a2 nd water-absorbent material 47 having a water-absorbent material containing a water-absorbent polymer and disposed at a position closer to the intermediate layer 43 than the 2 nd base 46. The 2 nd absorbent layer 42 can be viewed as having the 2 nd water absorbent material 47 as the absorbent core portion and the 2 nd base material 46 (and intermediate layer 43) as the core cladding. The 2 nd water absorbing material 47 is fixed to at least one of the 2 nd base material 46 and the intermediate layer 43 with an adhesive applied to at least one of the surface of the 2 nd base material 46 on the intermediate layer 43 side and the surface of the intermediate layer 43 on the 2 nd base material 46 side. The absorbent material of the 2 nd absorbent material 47 is disposed in the 2 nd absorbent layer 42 with a substantially uniform basis weight except for the pair of channels 48, 48 (described later).

The 2 nd water absorbing material 47 has a substantially rectangular planar shape one turn larger than the 1 st water absorbing material 45 in the width direction W and the length direction L. The 2 nd base material 46 has a substantially rectangular planar shape, and covers the 2 nd absorbent material 47 from the non-skin side in plan view, and the peripheral edge portion of the 2 nd base material 46 extends slightly outward from the periphery of the 2 nd absorbent material 47. Both ends of the 2 nd base material 46 in the width direction W cover both side surfaces of the 2 nd absorbent 47, and cover the skin-side surfaces of both ends of the 1 st base material 44 in the width direction W. That is, on the skin-side surface of the end portion in the width direction W of the 1 st absorbent layer 41, the end portion in the width direction W of the 2 nd base material 46 and the end portion in the width direction W of the 1 st base material 44 are overlapped and joined.

Both ends in the width direction W of the 2 nd base 46 cover the side surfaces in the width direction W of the 2 nd water absorbent 47 and cover the side surfaces in the width direction W of the 1 st base 44, whereby the 2 nd water absorbent 47 is enclosed in the 2 nd absorbent layer 42 in the width direction W and the 1 st water absorbent 45 is enclosed in the 1 st absorbent layer 41 in the width direction W.

In embodiment 1, the 1 st base material 44, the intermediate layer 43, and the 2 nd base material 46 are laminated and joined in the thickness direction T at both ends in the longitudinal direction L of the absorbent body 14. Thus, the 1 st water absorbent material 45 is enclosed in the 1 st absorbent layer 41 by the 1 st base material 44 and the intermediate layer 43 in the longitudinal direction L, and the 2 nd water absorbent material 47 is enclosed in the 2 nd absorbent layer 42 by the 2 nd base material 46 and the intermediate layer 43 in the longitudinal direction L.

In embodiment 1, the intermediate layer 43 has a substantially rectangular planar shape in plan view, and includes a low basis weight region LB having a relatively low basis weight and a pair of high basis weight regions HB having a relatively high basis weight. Specifically, the intermediate layer 43 includes a pair of high basis weight regions HB disposed at both ends in the width direction W and a low basis weight region LB disposed at the center in the width direction W.

The intermediate layer 43 is formed of a single liquid-permeable intermediate sheet 43S (specifically, a through-air nonwoven fabric including sheath-core composite fibers). The intermediate sheet 43S includes two

folding axes

103, 104, and is divided into a1 st sheet portion 43a disposed inside the two

folding axes

103, 104 and a pair of 2

nd sheet portions

43b, 43b disposed outside the two

folding axes

103, 104 in the unfolded state. The intermediate layer 43 is formed by folding a single intermediate sheet 43S in the thickness direction T, specifically, toward the 2 nd absorbent layer 42 side, according to two

folding axes

103, 104 extending in the longitudinal direction L.

In the intermediate layer 43, a single intermediate sheet 43S is folded along two

folding axes

103, 104, and a pair of 2

nd sheet portions

43b, 43b are disposed on both sides in the width direction W of the 1 st sheet portion 43a in the plane direction P, and a pair of 2

nd sheet portions

43b, 43b are disposed on the 2 nd absorbent layer 42 side in the thickness direction T. In other words, the 1 st sheet portion 43a is disposed at a position relatively distant from the 2 nd absorbent layer 42, and the pair of 2

nd sheet portions

43b, 43b are disposed at positions relatively close to the 2 nd absorbent layer 42, respectively.

The 1 st sheet portion 43a is in the width direction central region W _C And is in contact with the 2 nd absorbent layer 42 (2 nd absorbent layer central portion 42 a), and the 1 st sheet portion 43a is joined to the 2 nd absorbent layer 42 (2 nd absorbent layer central portion 42 a) by a hot melt adhesive (not shown). In addition, the 1 st piece portion 43a is adjacent to the pair of widthwise adjacent regions W _A And is not connected to a member existing on the liquid-impermeable sheet side of the 1 st sheet portion 43a, specifically, each 2 nd sheet portion 43b of the pair of 2

nd sheet portions

43b, 43b by the hot melt adhesive.

The pair of 2

nd sheet portions

43b, 43b are respectively adjacent to the pair of widthwise adjacent regions W _A And is in contact with the 2 nd absorbent layer 42 (2 nd absorbent layer adjacent portion 42 b), and the pair of 2

nd sheet portions

43b, 43b are joined to the 2 nd absorbent layer 42 (2 nd absorbent layer adjacent portion 42 b) by a hot melt adhesive (not shown).

The portions of the 1 st sheet portion 43a and each 2 nd sheet portion 43b of the pair of 2

nd sheet portions

43b, 43b that overlap in the thickness direction T constitute a pair of overlapping portions OP of the intermediate layer 43, and the portions of the 1 st sheet portion 43a that do not overlap with the pair of 2

nd sheet portions

43b, 43b in the thickness direction T constitute non-overlapping portions NP. The pair of overlapping portions OP correspond to the high basis weight regions HB of the pair of high basis weight regions HB, respectively, and the non-overlapping portion NP corresponds to the low basis weight region LB.

In the intermediate layer 43, the intermediate sheet 43S includes a web surface (not shown) that comes into contact with the web (placement surface) when the air-through nonwoven fabric is formed, and a non-web surface (not shown) on the side opposite to the web. The fiber density of the web is relatively high compared to the non-web. Since the intermediate sheet 43S is folded with the mesh surface on the inner side, the intermediate layer 43 is configured such that the fiber density inside the intermediate layer 43 is higher than the fiber density on the skin-side surface.

Therefore, the liquid absorbed in the intermediate layer 43 is easily transferred from the skin side surface to the inside by capillary action, then to the clothing surface (not shown), and further, the liquid transferred to the clothing surface of the intermediate layer 43 is easily transferred to the 2 nd absorbent layer 42. The skin-side surface (non-web surface) of the intermediate layer 43, which has a relatively low fiber density, can hold the 1 st water-absorbent material 45 contained in the 1 st absorbent layer 41, and the superabsorbent polymer has excellent retention properties.

The intermediate layer 43 has both end edges in the width direction W sandwiched between and bonded to both end portions in the width direction W of the 1 st base material 44 and the 2 nd base material 46, and has both end edges in the length direction L of the intermediate layer 43 sandwiched between and bonded to both end portions in the length direction L of the 1 st base material 44 and the 2 nd base material 46.

The absorbent body 14 has a pair of

channels

48, 48 extending along the length direction L. The pair of

passages

48, 48 are strip-shaped regions that are disposed in the 2 nd absorption layer 42, extend in the longitudinal direction L, and are arranged at predetermined intervals on both sides in the width direction W with a longitudinal center line CL therebetween. The channel 48 is disposed across the widthwise centerline CW at least in the central portion in the lengthwise direction L of the 2 nd absorption layer 42.

Each of the channels 48 of the pair of

channels

48, 48 is disposed in the widthwise central region W of the 2 nd absorbent layer 42 (the 2 nd absorbent layer central portion 42 a) _C Part (c) of (a). Each channel 48 of the pair of

channels

48, 48 is a region in which the weight per unit area of the 2 nd absorbent material 47 is smaller than the region around each channel 48 of the pair of channels 48, 48 (the region around the 2 nd absorbent layer central portion 42 a). Each channel 48 of the pair of

channels

48, 48 is formed such that the 2 nd base material 46 is recessed toward the intermediate layer 43, that is, such that the 2 nd water absorbing material 47 is recessed toward the intermediate layer 43.

Each of the pair of

channels

48, 48 is arranged so as to overlap with the pair of high area-per-area-weight regions HB (the pair of overlapping portions OP) of the intermediate layer 43 in the thickness direction T.

The 1 st water absorbing material 45 and the 2 nd water absorbing material 47 contain Super Absorbent Polymers (SAP). The basis weight of the super absorbent polymer in each of the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 can be appropriately adjusted in accordance with the absorption performance required for the pants-type diaper 1, but is, for example, 10g/m each ² ～500g/m ² Preferably 100g/m ² ～400g/m ² 。

The basis weights of the 1 st water-absorbing material 45 and the 2 nd water-absorbing material 47 may be larger in one than in the other, or may be the same. Wherein, the same means that one is in the range of 100% + -30% of the other. The 1 st water absorbent material 45 and the 2 nd water absorbent material 47 may further have hydrophilic fibers such as water absorbent fibers (e.g., pulp fibers). The proportion of the super absorbent polymer in the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 is, for example, 80 to 100% by mass, preferably 90 to 100% by mass, and more preferably 95 to 100% by mass.

Therefore, the 1 st water-absorbent material 45 and the 2 nd water-absorbent material 47 can be said to contain a super absorbent polymer as a main component, and the absorbent body 14 can be said to be a so-called SAP sheet.

The proportion of the super absorbent polymer in the absorbent body 14 (including not only the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 but also the adhesive, the 1 st base 44, the intermediate layer 43, and the 2 nd base 46) is, for example, 40 to 80% by mass, preferably 50 to 80% by mass, and more preferably 60 to 80% by mass.

In embodiment 1, the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 are both formed of only a super absorbent polymer and do not contain hydrophilic fibers.

Preferably, 90 to 100 mass% of the superabsorbent polymer is formed of superabsorbent polymer particles having a particle diameter of 150 to 500 μm. The superabsorbent polymer particles having the above particle diameter have a small and uniform particle diameter and are therefore easily retained in the adhesive. The particle diameter of the super absorbent polymer particles is measured in accordance with JIS R6002: the screening test method described in 1998 was standard.

The adhesive is not particularly limited as long as it can fix the super absorbent polymer, and examples thereof include a hot melt adhesive. The pattern of the adhesive to be applied is not particularly limited, but examples thereof include a continuous or intermittent Ω pattern, a spiral pattern, and a line pattern. The weight per unit area of the adhesive being such as not to significantly reduce the weight of the absorbent body 14The liquid absorbency is appropriately adjusted, and for example, each layer is 3g/m ² ～50g/m ² . Here, each layer means a layer of the adhesive between the 1 st water absorbent material 45 and the 1 st base 44, a layer of the adhesive between the 1 st water absorbent material 45 and the intermediate layer 43, a layer of the adhesive between the 2 nd water absorbent material 47 and the 2 nd base 46, and a layer of the adhesive between the 2 nd water absorbent material 47 and the intermediate layer 43.

The 1 st base material 44 is not particularly limited as long as it is a liquid-permeable sheet. Examples of the 1 st substrate 44 include a liquid-permeable nonwoven fabric containing synthetic fibers, a hydrophilic nonwoven fabric, and a laminated nonwoven fabric thereof, and among them, a nonwoven fabric having high water permeability is preferable. Examples of the 1 st substrate 44 include a spun-bonded nonwoven fabric and a hot-air nonwoven fabric formed of polyolefin fibers such as Polyethylene (PE) and polypropylene (PP), polyester fibers such as polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT) and polyethylene naphthalate (PEN), or a combination thereof.

The synthetic fibers are preferably hydrophilized by a known method.

The liquid-permeable sheet may be, for example, an air-laid nonwoven fabric in which hydrophilic fibers such as pulp fibers and rayon fibers are coated with a hydrophilic binder, or a nonwoven fabric in which the hydrophilic fibers and the synthetic fibers are combined, such as a spunlace nonwoven fabric. In embodiment 1, an air-laid nonwoven fabric having liquid permeability and liquid retention properties, in which pulp fibers are coated with a hydrophilic binder, is used.

The 1 st substrate 44 may be formed by laminating one or more kinds of the nonwoven fabrics.

The unit area weight of the No. 1 substrate 44 is, for example, 10g/m ² ～100g/m ² Preferably 20g/m ² ～80g/m ² . The thickness of the 1 st substrate 44 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3mm.

The 2 nd substrate 46 is not particularly limited as long as it is a sheet having water retentivity and liquid diffusibility. Examples of the 2 nd base 46 include nonwoven fabrics formed of synthetic fibers such as polyamide fibers, regenerated fibers such as rayon fibers and acetate fibers, natural fibers such as cotton, silk, hemp and pulp (cellulose) fibers, or a combination thereof. Specifically, the 2 nd substrate 46 may be, for example, a spun-bonded nonwoven fabric containing nylon, a spun-laced nonwoven fabric containing rayon fibers and/or pulp fibers, or the like. The spunlace nonwoven containing rayon fibers and/or pulp fibers may also contain polyolefin fibers and/or polyester fibers. In embodiment 1, a spunlace nonwoven fabric containing rayon fibers and pulp fibers, which has liquid retention and liquid diffusion properties, is used.

The 2 nd substrate 46 may be formed of one of the nonwoven fabrics, or may be formed by laminating a plurality of nonwoven fabrics.

The basis weight of the No. 2 substrate 46 is, for example, 10g/m ² ～200g/m ² Preferably 35g/m ² ～150g/m ² . The thickness of the 2 nd substrate 46 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3mm.

The intermediate layer 43 (intermediate sheet 43S) is, for example, a sheet similar to the 1 st substrate 44. The weight per unit area of the intermediate layer 43 is, for example, 10g/m ² ～100g/m ² Preferably 15g/m ² ～80g/m ² . The thickness of the intermediate layer 43 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3mm.

In embodiment 1, as shown in fig. 5, the absorber 14 includes a back-side region BA, a stomach-side region FA, and a crotch region MA which are arranged in the longitudinal direction L. Here, the back-side area BA is an area of the absorbent body 14 that overlaps with the back-side portion 3 in the thickness direction T. The abdomen-side region FA is a region of the absorbent body 14 that overlaps the abdomen-side portion 2 in the thickness direction T. The crotch region MA is a region of the absorber 14 between the back-side region BA and the stomach-side region FA, i.e., a region overlapping with the crotch portion 4 in the thickness direction T. Thus, the absorber 14 is divided into a back-side region BA overlapping the back-side portion 3, a stomach-side region FA overlapping the stomach-side portion 2, and a crotch region MA overlapping the crotch portion 4 along the longitudinal direction L.

In embodiment 1, the absorbent body 14 includes SAP high area weight regions 14a, SAP low area weight regions 14b, and SAP non-arrangement regions 14c. The SAP high basis weight region 14a is a region in which the basis weight of the super absorbent polymer is relatively high, and is a region in which the 1 st absorbent layer 41 and the 2 nd absorbent layer 42 overlap in the thickness direction T. The SAP low basis weight region 14b is a region in which the basis weight of the super absorbent polymer is relatively low, and is a region in which the 1 st absorbent layer 41 is not present and only the 2 nd absorbent layer 42 is present in the thickness direction T. The SAP non-arranged region 14c is a region not containing a super absorbent polymer, and is a region where the 1 st absorption layer 41 and the 2 nd absorption layer 42 are not present in the thickness direction T. The term "not containing a super absorbent polymer" includes the case where the weight per unit area of the super absorbent polymer is very small although the super absorbent polymer is present. "very small" means that the weight per unit area of the super absorbent polymer is 5% or less of the weight per unit area of the super absorbent polymer in the SAP high weight per unit area region 14a.

Thus, in the absorbent body 14, the back-side region BA includes back-side SAP high-area-weight regions BAa as the SAP high-area-weight regions 14a, back-side SAP low-area-weight regions BAb as the SAP low-area-weight regions 14b, and back-side SAP non-disposition regions barc as the SAP non-disposition regions 14c. In the absorbent body 14, the abdominal-side region FA includes an abdominal-side SAP high unit area weight region FAa as the SAP high unit area weight region 14a, an abdominal-side SAP non-arrangement region FAc as the SAP non-arrangement region 14c, and does not include an abdominal-side SAP low unit area weight region FAb. The crotch region MA has only the SAP high area weight region 14a.

Therefore, the basis weight of the superabsorbent polymer in the back-side SAP high basis weight region BAa and the abdominal-side SAP high basis weight region FAa is equivalent to the basis weight of the superabsorbent polymer in the crotch region MA. "equivalent" means that one is in the range of 0.7 to 1.3 times (100% ± 30%) the other.

The 2 nd absorbent layer 42 includes a protruding portion protruding outward from the end edge of the 1 st absorbent layer 41 at the rear end in the longitudinal direction L in plan view. The protrusion includes a backside SAP low-area-weight region BAb, which is the same as the backside SAP low-area-weight region BAb. The 2 nd absorption layer 42 is covered with the intermediate layer 43, and thus the protruding portion, i.e., the skin side of the back-side SAP low-area-weight region BAb is covered with the intermediate layer 43 and the 1 st base material 44.

In the absorber 14, db2> dc2> da2 is obtained when the length of the back-side SAP high-area-weight region BAa, the length of the back-side SAP low-area-weight region BAb, and the length of the back-side SAP non-arrangement region barc are da2, db2> dc2> da2, respectively, in the longitudinal direction L. That is, in the back-side area BA, the length of the back-side SAP low-area-weight area BAb is made relatively long, the weight per unit area of the super absorbent polymer is suppressed to be low as a whole, and the super absorbent polymer is arranged to the rear side portion in the longitudinal direction L. It is possible to easily suppress the transmission leakage of the liquid that flows to the back side although the amount is small.

In the absorbent body 14, da1> dc1 is obtained when the length of the abdominal-side SAP high basis weight region FAa is da1 and the length of the abdominal-side SAP non-arrangement region FAc is dc1 in the longitudinal direction L. That is, in the ventral region FA, the length of the ventral SAP high basis weight region FAa is made relatively long, the basis weight of the superabsorbent polymer is increased as a whole, and the superabsorbent polymer is disposed at the front end in the longitudinal direction L. This makes it possible to reliably absorb the liquid on the abdominal side with a large amount of excretion.

In the absorber 14, dc2> dc1 in the longitudinal direction L. The length of the back-side SAP non-disposition region barc is relatively long, the amount of the superabsorbent polymer used in the back-side region BA with a small amount of excretion is suppressed to be low, and the length of the abdomen-side SAP non-disposition region FAc is relatively short, so that the liquid in the abdomen-side region FA with a large amount of excretion can be easily and reliably absorbed.

In addition, in another embodiment, in the absorber 14, da2+ db2> da1 in the longitudinal direction L. In this case, by disposing the super absorbent polymer in the back-side area BA further to the rear side in the longitudinal direction L, it is possible to more easily suppress the transmission leakage of the liquid flowing to the back side although the amount is small.

As shown in FIG. 6, when liquid, for example, the 1 st urine reaches the absorbent body 14, the liquid is mainly in the widthwise central region W _C Passes through the 1 st absorbent layer 41 and the intermediate layer 43, and reaches the 2 nd absorbent layer 42 (2 nd absorbent layer central portion 42 a), and at this time, a gap 101 is formed between the 1 st sheet portion 43a and the pair of 2

nd sheet portions

43b, 43b.

Specifically, in the 1 st absorbent layer 41, the liquid is mainly in the widthwise central region W _C Passes through the first water absorbent material 45 and is transferred to the intermediate layer 43. The 1 st water absorbent material 45 absorbs the remaining liquid and swells mainly in the thickness direction T.

The intermediate layer 43 has a function of temporarily storing liquid, but in the intermediate layer 43, in the widthwise central region W _C Since the low basis weight region LB (non-overlapping portion NP) is disposed in the central portion (portion including the longitudinal centerline CL), the intermediate layer 43 has a small amount of temporarily stored liquid (compared with the high basis weight region HB), and the liquid can be transferred to the 2 nd absorbent layer 42.

In the 2 nd absorption layer 42, in the widthwise central region W _C The pair of

channels

48, 48 extending in the longitudinal direction L are arranged (the 2 nd absorbent layer central portion 42 a), and therefore the liquid that has reached the 2 nd absorbent layer 42 tends to be left between the pair of

channels

48, 48 in the width direction and to spread between the pair of

channels

48, 48 in the longitudinal direction L. As a result, the 2 nd water absorbent material 47 absorbs liquid mainly between the pair of passages 48, and the 2 nd water absorbent material 47 swells mainly in the thickness direction T between the pair of

passages

48, 48.

The 1 st absorbent layer 41 (the 1 st water absorbent material 45) and the 2 nd absorbent layer 42 (the 2 nd water absorbent material 47) swell in the thickness direction T, so that a void 101 is formed between the 1 st water absorbent material 45 and the 2 nd water absorbent material 47, specifically, between the 1 st sheet portion 43a and the pair of 2

nd sheet portions

43b, 43b.

In the intermediate layer 43, the 1 st sheet portion 43a and the pair of 2

nd sheet portions

43b, 43b are formed by the integral intermediate sheet 43S folded in the thickness direction T at the two

folding axes

103, 104, and therefore the void 101 is easily formed by the restoring force at the two

folding axes

103, 104 of the integral intermediate sheet 43S.

In the intermediate layer 43, the 1 st sheet portion 43a is disposed inside the two

folding axes

103, 104 of the intermediate sheet 43S, and the pair of 2

nd sheet portions

43b, 43b are disposed outside the two

folding axes

103, 104 of the intermediate sheet 43S, that is, the two

folding axes

103, 104 are disposed at both end edges in the width direction W of the intermediate layer 43, so that when a force narrowing in the width direction W is applied to the pants-type diaper 1 by the thighs of the wearer when the pants-type diaper 1 is worn, a force narrowing in the width direction W is also applied to the two

folding axes

103, 104, and the void 101 is easily formed.

In embodiment 1, the fiber diameter of the composite fibers constituting the 1 st sheet portion 43a (intermediate sheet 43S) of the intermediate layer 43 is larger than the fiber diameter of the fibers constituting the liquid-permeable sheet 12. This increases the restoring force at the two

folding axes

103 and 104 of the intermediate sheet 43S, and the gap 101 is easily formed.

Next, when additional liquid, for example, the 2 nd or later urine reaches the absorbent body 14, the intermediate layer 43 temporarily stores the liquid in the gap 101 and causes the liquid to flow from the widthwise central region W _C Adjacent to a pair of width directions W _A The liquid is supplied to the 1 st and 2 nd water-absorbing

materials

45 and 47 as needed by diffusion.

The absorbent body 14 has voids 101 formed therein, and therefore the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 supplied with liquid can absorb liquid and swell toward the voids 101. As a result, as shown in fig. 7, the 1 st water absorbent material 45, the 2 nd water absorbent material 47, and the absorbent body 14 can absorb a large amount of liquid, for example, urine many times and swell.

The end portions of the pair of 2

nd sheet portions

43b, 43b (the end portions on the side opposite to the two folding axes 103, 104) overlap with the respective passages 48 of the pair of

passages

48, 48 in the thickness direction T, respectively. Thus, when the 2 nd absorbent layer 42 swells in the thickness direction T, the ends of the pair of 2

nd sheet portions

43b, 43b do not easily move in the thickness direction T, and a space is more easily formed between the 1 st sheet portion 43a and the pair of 2

nd sheet portions

43b, 43b.

The 1 st sheet portion 43a is joined to the 2 nd absorbent layer 42, specifically, the 2 nd base material 46, only between the pair of

channels

48, 48 in the width direction W, specifically, bonded with a hot melt adhesive. Thus, when the widthwise central portion of the 2 nd absorbent layer 42 rises, the 1 st sheet portion 43a reliably rises, and the gap 101 is more likely to be generated between the 1 st sheet portion 43a and the pair of 2

nd sheet portions

43b, 43b.

Next, a method for producing the absorbent body 14 will be described.

First, the sheet for the 2 nd substrate 46 is moved in the longitudinal direction L, and the hot melt adhesive is applied onto the sheet for the 2 nd substrate 46. Next, a super absorbent polymer was sprayed from a super absorbent polymer supply device onto both end portions and a central portion in the width direction W of the sheet for the 2 nd substrate 46 coated with the hot melt adhesive along the length direction L, respectively. At this time, a small amount of the super absorbent polymer is transferred to the region (corresponding to the channel) between the both end portions and the central portion. Next, a sheet for the intermediate layer 43 coated with hot melt adhesive on both sides was laminated on the super absorbent polymer on the sheet for the 2 nd substrate 46.

Next, the laminate was moved in the longitudinal direction L, and a super absorbent polymer was sprayed from another super absorbent polymer supply device in the longitudinal direction L onto the central portion in the width direction W of the sheet for the intermediate layer 43 coated with the hot melt adhesive. Next, the sheet for the 1 st substrate 44 coated with the hot melt adhesive was laminated on the super absorbent polymer on the sheet for the intermediate layer 43 so that the hot melt adhesive was located on the super absorbent polymer side. Then, both side portions in the width direction W of the 2 nd base material 46 sheet are folded back onto both side portions in the width direction W of the 1 st base material 44 sheet to obtain a laminate. Thereafter, the thickness of the laminate is adjusted by passing the laminate through a pair of press rolls, i.e., pressing, to obtain the absorbent body 14.

Next, a method for manufacturing a pants-type diaper using the absorbent body 14 will be described.

A liquid-permeable sheet 12 is attached to the upper surface (the surface of the 1 st base 44) of the absorbent body 14 produced as described above, and a liquid-impermeable sheet 13 is attached to the lower surface (the surface of the 2 nd base 46) of the absorbent body 14, thereby obtaining a laminate. Next, the side sheets 17 with the leakage preventing walls 16 are attached to both sides in the width direction W of the laminate to obtain the absorbent main body 10. Thereafter, the absorbent body 10 is attached to the cover sheet 5 (including the elastic members 6, 7, and 8), and both

ends

2a and 2a in the width direction W of the abdomen-side portion 2 and both

ends

3a and 3a in the width direction W of the back-side portion 3 are joined. Thereby, the pants-type diaper 1 is manufactured.

Fig. 8 is a diagram for explaining a pants-type diaper (not shown) according to another embodiment of the present disclosure (hereinafter, may be referred to as "embodiment 2"), and corresponds to fig. 4 of embodiment 1.

In the pants-type diaper (not shown) according to embodiment 2, the end portions (the end portions on the opposite side from the two folding axes 103 and 104) of the pair of

second panel portions

43b and 43b are closer to the longitudinal center line than the pants-type diaper 1 according to embodiment 1 (see fig. 1 and the like).

In the pants-type diaper (not shown) according to embodiment 2, the 1 st panel portion 43a and the 2 nd panel portion 43b are joined together by a pair of embossed portions 43c extending in the longitudinal direction L in a pair of high basis weight regions HB (a pair of overlapping portions OP) of the intermediate layer 43.

The pants-type diaper (not shown) according to embodiment 2 is otherwise the same as the pants-type diaper 1 according to embodiment 1, and therefore, the description thereof is omitted.

When the pants-type diaper (not shown) absorbs liquid and a gap (see fig. 6) is formed between the 1 st sheet portion 43a and the pair of 2

nd sheet portions

43b and 43b, the pair of embossed portions 43c function to suppress twisting of the absorbent body 14.

The absorbent article of the present disclosure is not particularly limited, and examples thereof include disposable diapers, incontinence pads, disposable pants, sanitary napkins, panty-type sanitary napkins, panty liners, mattress pads, breast pads, hemorrhoid pads, sweat absorbing pads, bedsore sheets (wound repair sheets), pet diapers, and pet sheets.

In the absorbent article of the present disclosure, the absorbent body includes the intermediate layer and the absorbent layer containing the super absorbent polymer in the thickness direction of the absorbent article, and the intermediate layer may be disposed on the liquid-permeable sheet side or the liquid-impermeable sheet side of the absorbent layer. This is because the absorbent layer tends to rise toward both the liquid-permeable sheet side and the liquid-impermeable sheet side in the thickness direction of the absorbent article, and therefore, the intermediate layer can form a predetermined gap regardless of which side of the absorbent layer the intermediate layer is on.

In the absorbent article of the present disclosure, the intermediate layer may be disposed on the liquid-permeable sheet side of the absorbent layer, and the absorbent body may further include an additional absorbent layer containing a super absorbent polymer on the liquid-permeable sheet side of the intermediate layer, that is, the absorbent body may include two absorbent layers (an absorbent layer and an additional absorbent layer) so as to sandwich the intermediate layer. Thereby, the two absorption layers can expand toward the void formed in the intermediate layer.

In the embodiments (embodiment 1 and embodiment 2) in the present specification, the absorption layer and the additional absorption layer are referred to as a2 nd absorption layer and a1 st absorption layer, respectively.

In the absorbent article of the present disclosure, the absorber is divided in the width direction of the absorbent article into a width direction central region including a longitudinal direction center line of the absorbent article and a pair of width direction adjacent regions adjacent to the width direction central region. The width direction central region is a region extending from the longitudinal direction center line toward both end edges in the width direction by 30%, and the pair of width direction adjacent regions are regions extending from the end edges in the width direction of the absorbent body toward the width direction center line by 20%. In other words, the widthwise central region occupies a region of 60% in the widthwise direction of the absorber, and the pair of widthwise adjacent regions respectively occupy a region of 20% in the widthwise direction of the absorber (40% in total as widthwise adjacent regions).

In the absorbent article of the present disclosure, the intermediate layer is provided with a1 st sheet portion distant from the absorbent layer and a2 nd sheet portion close to the absorbent layer. This is from the viewpoint of forming a gap between the 1 st sheet portion and the 2 nd sheet portion.

In the absorbent article of the present disclosure, the 1 st sheet portion and the 2 nd sheet portion may be formed of either an independent intermediate sheet or an integrated intermediate sheet, and moreover, the 1 st sheet portion and the 2 nd sheet portion are preferably formed of an integrated intermediate sheet folded in the thickness direction of the absorbent article at a predetermined folding axis. Thereby, the above-described gap is easily formed by the restoring force at the folding axis of the integrated sheet.

In the absorbent article of the present disclosure, it is preferable that the intermediate layer is formed of an integrated intermediate sheet folded in the thickness direction of the absorbent article at two folding axes extending in the length direction of the absorbent article and separated from each other, and the 1 st sheet portion is disposed inside the two folding axes of the integrated intermediate sheet and the 2 nd sheet portion is disposed outside the two folding axes of the integrated intermediate sheet. Thereby, the above-described void is easily formed by the restoring force at the two folding axes of the integrated intermediate sheet. Further, when a force that narrows in the width direction is applied to the absorbent article by the thighs of the wearer when the absorbent article is worn, a force that narrows in the width direction is also applied to the two folding axes, and the void is easily formed.

In the absorbent article of the present disclosure, the 1 st panel portion is disposed at least in the width direction central region, and preferably also in a pair of width direction adjacent regions, and the 2 nd panel portion is disposed at least in at least one of the pair of width direction adjacent regions, and preferably in both. This is from the viewpoint of void formation.

The 2 nd sheet part may be disposed in the widthwise central region as long as it does not reach the longitudinal center line.

In the absorbent article of the present disclosure, the 1 st sheet portion is in contact with the absorbent layer (e.g., absorbent material) in the widthwise central region, and the 1 st sheet portion is in contact with the absorbent layer (e.g., absorbent material) without interposing the 2 nd sheet portion therebetween. Further, the 1 st sheet portion is preferably joined to the absorbent layer (e.g., water absorbent material) at the widthwise central region by, for example, hot melt adhesive, embossing, or the like. This is to reliably form a gap between the 1 st sheet portion and the 2 nd sheet portion.

In the absorbent article of the present disclosure, the 1 st sheet portion is not joined to a member present on the liquid-impermeable sheet side of the 1 st sheet portion, for example, the 2 nd sheet portion, as a whole at a pair of widthwise adjacent regions with, for example, a hot melt adhesive, embossing, or the like. This is from the viewpoint of void formation.

In addition, the 1 st sheet portion may be locally joined to a member existing on the liquid-impermeable sheet side of the 1 st sheet portion, for example, the 2 nd sheet portion, at a pair of widthwise adjacent regions by a joint portion. This is from the viewpoint of suppressing twisting of the absorber when the absorber forms a void. The joining portion is not particularly limited, and examples thereof include a hot melt adhesive and an embossed portion, and the embossed portion is preferable. This is because it is not easily affected by the liquid. In the case of the embossed portion, it is preferable that the intermediate layer contains heat-fusible fibers, and the heat-fusible fibers are fused at the embossed portion.

In the absorbent article of the present disclosure, the 2 nd sheet portion is in contact with the absorbent layer (e.g., absorbent material) at a pair of widthwise adjacent regions, and the 2 nd sheet portion is preferably joined to the absorbent layer (e.g., absorbent material) with, for example, a hot melt adhesive, embossing, or the like. This is to reliably form a gap between the 1 st sheet portion and the 2 nd sheet portion.

In the absorbent article of the present disclosure, the intermediate layer and the adjacent sheet (for example, the liquid-permeable sheet and the second sheet) adjacent to the liquid-permeable sheet side of the 1 st sheet portion may each contain a fiber, and in this case, the fiber diameter of the fiber constituting the 1 st sheet portion may have an arbitrary relationship with the fiber diameter of the fiber constituting the adjacent sheet, but it is preferable that the fiber diameter of the fiber constituting the 1 st sheet portion is larger than the fiber diameter of the fiber constituting the adjacent sheet. Thereby, the restoring force at the folding axis (both folding axes) of the integrated intermediate sheet is larger, and the above-described gap is easily formed.

In the absorbent article of the present disclosure, the absorbent layer and the additional absorbent layer provided as desired each contain a super absorbent polymer. The super absorbent polymer is not particularly limited, and includes super absorbent polymers known in the art, and examples thereof include starch-based, cellulose-based, and synthetic polymer-based super absorbent polymers. Examples of the starch-based or cellulose-based Super absorbent Polymer include a starch-acrylic acid (salt) graft copolymer, a saponified product of a starch-acrylonitrile copolymer, and a cross-linked product of sodium carboxymethylcellulose, examples of the synthetic Polymer-based Super absorbent Polymer include Super absorbent polymers (SAP, super absorbent Polymer) such as polyacrylate, polysulfonate, maleic anhydride, polyacrylamide, polyvinyl alcohol, polyethylene oxide, polyaspartate, polyglutamate, polyalphamide, starch, and cellulose, and the like, and the Super absorbent Polymer is preferably a polyacrylate (particularly a sodium polyacrylate).

In the absorbent article of the present disclosure, the absorbent layer and the additional absorbent layer provided as desired are not particularly limited as long as they are mainly composed of the super absorbent polymer, and hydrophilic fibers such as pulp fibers may be further included. The shape of the absorbent body in plan view is not particularly limited, and examples thereof include a rectangle having a short side projecting in an arc shape, a rounded rectangle, an ellipse, and an hourglass shape. The thickness of the absorbent body is, for example, 0.5mm to 20mm, preferably 1mm to 10mm.

In the absorbent article of the present disclosure, the absorber may be provided with a channel. The channels may be disposed in the absorption layer and/or an additional absorption layer provided as desired. This makes it easy to guide the deformation of the absorbent body and thus the absorbent article when the absorbent article is worn. From this viewpoint, it is preferable that the passage extends in the longitudinal direction, and it is more preferable that a pair of passages extend in the longitudinal direction with a longitudinal center line interposed therebetween.

In addition, the pair of channels is preferably disposed in the absorption layer. This is from the viewpoint of ease of guiding deformation of the absorbent article.

The pair of channels may be arranged such that, for example, the interval between the pair of channels is constant in the longitudinal direction of the absorbent body in a plan view, or may be arranged such that the interval between the pair of channels is narrower near the center in the longitudinal direction of the absorbent article, for example, and expands toward both outer sides in the longitudinal direction.

The pair of channels may be disposed in the absorption layer, and the pair of channels may be disposed in a central portion in the width direction, which is a portion of the absorption layer corresponding to the central region in the width direction. Thus, when the absorbent body or the absorbent layer absorbs liquid, the liquid is easily retained between the pair of channels, the widthwise central portion of the absorbent layer is raised, and further, the void is easily formed.

Preferably, the pair of channels overlaps with the end portion of the 2 nd sheet portion in the thickness direction of the absorbent article. Thereby, when the absorbent layer absorbs liquid and swells (swells) in the thickness direction together with the 1 st sheet portion, the 2 nd sheet portion does not easily swell in the thickness direction with the swelling of the absorbent layer, and a space is more easily formed between the 1 st sheet portion and the 2 nd sheet portion.

Claims

1. An absorbent article comprising a liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent body between the liquid-permeable sheet and the liquid-impermeable sheet, having a longitudinal direction, a width direction, and a thickness direction,

the 2 nd sheet portion is in contact with the absorbent layer at the pair of widthwise adjacent regions,

the intermediate layer is disposed on the liquid-permeable sheet side of the absorbent layer, and the absorbent body further includes an additional absorbent layer containing a super absorbent polymer on the liquid-permeable sheet side of the intermediate layer,

the absorbent layer is provided with a pair of channels extending in the longitudinal direction and separated in the width direction central region,

the end of the 2 nd sheet portion overlaps the pair of channels in the thickness direction.

2. An absorbent article comprising a liquid-permeable sheet, a liquid-impermeable sheet, and an absorbent body between the liquid-permeable sheet and the liquid-impermeable sheet, having a longitudinal direction, a width direction, and a thickness direction,

the absorbent layer is provided with a pair of channels in the width direction central region, the pair of channels extending in the length direction and being separated in the width direction,

the 1 st sheet portion is in contact with the absorbent layer only between the pair of channels in the width direction.

3. The absorbent article according to claim 1 or 2, wherein,

the 1 st and 2 nd sheet portions are formed of an integral intermediate sheet folded in the thickness direction at a predetermined folding axis.

4. The absorbent article according to claim 1 or 2, wherein,

the intermediate layer is formed of an integrated intermediate sheet folded in the thickness direction at two folding axes extending in the length direction and separated from each other, and a1 st sheet portion is disposed inside the two folding axes of the integrated intermediate sheet and a2 nd sheet portion is disposed inside the two folding axes of the integrated intermediate sheet.

5. The absorbent article according to claim 1 or 2, wherein,

the intermediate layer and an adjacent sheet adjacent to the liquid-permeable sheet side of the 1 st sheet portion each contain fibers, and the fibers constituting the 1 st sheet portion have a larger fiber diameter than the fibers constituting the adjacent sheet.

6. The absorbent article according to claim 1 or 2, wherein,

the intermediate layer has a joining portion that locally joins the 1 st sheet portion and the 2 nd sheet portion at a position where the 1 st sheet portion and the 2 nd sheet portion overlap in the thickness direction.

7. The absorbent article of claim 6,

the intermediate layer contains heat-fusible fibers, and the joint is an embossed portion.