CN111374826B

CN111374826B - Absorbent article

Info

Publication number: CN111374826B
Application number: CN201811635913.5A
Authority: CN
Inventors: 川上祐介; 高居义; 沈莲莲; 郭晓彤
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2018-12-29
Filing date: 2018-12-29
Publication date: 2023-04-07
Anticipated expiration: 2038-12-29
Also published as: JP7170622B2; JP2020108750A; WO2020137428A1; CN111374826A

Abstract

Provided is an absorbent article having excellent temporary liquid storage properties and excellent indication properties of an indication part. An absorbent article (1) comprising a liquid-permeable sheet (12), a liquid-impermeable sheet (13), an absorbent body (14) disposed between the liquid-permeable sheet (12) and the liquid-impermeable sheet (13), and an intermediate layer (43), the absorbent body (14) comprising a super absorbent polymer, the absorbent article (1) having a thickness direction (T) and a plane direction (P), the absorbent article (1) being characterized in that the intermediate layer (43) comprises, in the plane direction (P), a low basis weight region (LB) in which the basis weight is relatively low and a high basis weight region (HB) in which the basis weight is relatively high, the absorbent article (1) further comprising an indicator (101) disposed so as to overlap with the low basis weight region (LB) in the thickness direction (T).

Description

Absorbent article

Technical Field

The present disclosure relates to an absorbent article.

Background

As an Absorbent material, an Absorbent article having an Absorbent body containing a relatively large amount of Super Absorbent Polymer (SAP) is known.

For example, patent document 1 discloses an absorbent article 20 such as a diaper or training pants having a front edge portion 10, a rear edge portion 12 and two longitudinally extending

side edge portions

13, 14, characterized in that the absorbent article has a topsheet 24, a backsheet 25 and an absorbent core 28 between the topsheet and the backsheet, the absorbent core has a core wrap 16, 16 'for enclosing an absorbent material 60 containing superabsorbent polymer particles, the core wrap has an upper side 288 and a bottom side 290, the absorbent core has at least two longitudinally extending channel forming regions 26a, 26b substantially free of absorbent material, the upper side of the core wrap is attached to the bottom side of the core wrap via the channel forming regions, whereby the absorbent article further includes a channel 26' a, 26'b formed in the region 26a, 26b substantially free of absorbent material when the absorbent material absorbs liquid, the channel 26' b extending in the direction along the channel forming region 26a, 26b, and any one of the channel forming regions 26a, 26b and the channel forming region 100, which is arranged between the channel forming region 26a, 26b and/or the channel forming a moisture in the direction of the core wrap 14.

The absorbent article described in patent document 1 can have a thinner absorbent body than a conventional absorbent body containing pulp fibers, and therefore can provide a clean impression or the like to the absorbent article.

In the absorbent article described in patent document 1, in order to compensate for a delay in the liquid absorbency of the super absorbent polymer, a temporary storage layer for temporarily storing liquid, specifically, a trapping and/or distributing layer 54 can be disposed. This makes it difficult for the liquid that has reached the absorbent article to leak out of the absorbent article, and the absorbent article has excellent temporary liquid storage properties.

Documents of the prior art

Patent document

Patent document 1: JP 2017-501768A

Disclosure of Invention

Problems to be solved by the invention

In the case where the absorbent article described in patent document 1 includes the acquisition and/or distribution layer 54, the liquid that has reached the absorbent article may remain in the acquisition and/or distribution layer 54, may hardly reach the humidity indicator 100, may make it difficult for the humidity indicator 100 to function, may make it difficult for the user of the absorbent article to know that the absorbent article has absorbed the liquid, and may make the user miss the timing for replacing the absorbent article.

Accordingly, an object of the present disclosure is to provide an absorbent article having excellent temporary storage properties of liquid and excellent indication properties of an indication portion.

Means for solving the problems

The present disclosure provides an absorbent article including a liquid-permeable sheet, a liquid-impermeable sheet, an absorbent body disposed between the liquid-permeable sheet and the liquid-impermeable sheet, the absorbent body including a super absorbent polymer, the absorbent article having a thickness direction and a plane direction, wherein the intermediate layer includes a low basis weight region having a relatively low basis weight and a high basis weight region having a relatively high basis weight in the plane direction, and the absorbent article further includes an indicator portion disposed so as to overlap the low basis weight region in the thickness direction.

ADVANTAGEOUS EFFECTS OF INVENTION

The absorbent article of the present disclosure is excellent in the temporary storage of liquid and the indication of the indication portion.

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 pants-type diaper according to embodiment 2.

Description of the reference numerals

1: pants-type diaper

2: ventral part (ventral girdle)

3: back side part (Back waist belt)

4: crotch part

5. 5a, 5b: cover sheet

6a, 6b, 7a, 7b: elastic member

10: absorbent body

12: liquid-permeable sheet

13: liquid-impermeable sheet

14: absorbent body

41: 1 st absorption layer

42: 2 nd absorption layer

43: intermediate layer

43S: intermediate sheet

43a: 1 st sheet part

43b: 2 nd sheet part

43c: embossing part

44: no. 1 base material

45: no. 1 Water absorbent Material

46: no. 2 base material

47: no. 2 Water-absorbing Material

48: channel

101: indicating part

103. 104: folding shaft

L: length direction of the film

W: width direction of the sheet

T: thickness direction

CL: center line in length direction

CW: center line in width direction

LB: region of low weight per unit area

HB: region of high basis weight

OP: overlapping part

NP: non-overlapping part

HD: high fiber density section

LD: low fiber density portion

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, an absorbent body disposed between the liquid-permeable sheet and the liquid-impermeable sheet, and an intermediate layer, the absorbent body comprising a super absorbent polymer, the absorbent article having a thickness direction and a plane direction,

the intermediate layer has a low area weight region having a relatively low weight per unit area and a high area weight region having a relatively high weight per unit area in the plane direction,

the absorbent article further includes an indicator portion arranged to overlap with the low basis weight region in the thickness direction.

The absorbent article includes the intermediate layer including the low basis weight region and the high basis weight region, and the indicator portion disposed so as to overlap the low basis weight region of the intermediate layer, so that the high basis weight region of the intermediate layer temporarily stores liquid and leakage of liquid from the absorbent article can be suppressed, and the low basis weight region of the intermediate layer allows liquid to pass therethrough, and the liquid reaches the indicator portion, and the response of the indicator portion is hardly hindered, so that the indicator portion can reliably respond to the liquid.

Therefore, the absorbent article is excellent in the temporary liquid storage property and the indication property of the indication portion.

[ solution 2]

The absorbent article according to claim 1, wherein the intermediate layer is constituted by an intermediate sheet folded in the thickness direction at a predetermined folding axis, and the intermediate layer is divided into an overlapping portion where the intermediate sheet overlaps in the thickness direction and a non-overlapping portion where the intermediate sheet does not overlap in the thickness direction, and the high area-by-area-weight region is constituted by the overlapping portion.

In the absorbent article, the high basis weight region of the intermediate layer is formed of the overlapping portion and the folding axis, and therefore, when the absorbent article absorbs liquid, the overlapping portion forming the high basis weight region can be expanded in the thickness direction with the folding axis as a base point, and therefore, the liquid can be further temporarily stored, and the absorbent article is excellent in temporary storage properties.

[ solution 3]

The absorbent article according to

claim

1 or 2, wherein the intermediate layer is disposed between the liquid-permeable sheet and the absorbent body.

In the absorbent article, the intermediate layer is disposed between the liquid-permeable sheet and the absorbent body, and therefore, when liquid is transferred from the liquid-permeable sheet to the absorbent body, the intermediate layer can temporarily store the liquid quickly, and therefore, the absorbent article is excellent in liquid temporary storage properties.

[ solution 4]

The absorbent article according to claim 3, wherein the indicator is disposed between the intermediate layer and the absorbent body.

In the absorbent article, the indicator is disposed between the intermediate layer and the absorbent body, and therefore the indicator itself can be separated from the wearer by interposing the intermediate layer between the indicator and the wearer. In addition, the low area weight region of the intermediate layer is easily permeable to liquid, liquid can quickly reach the indicator portion, and the low area weight region of the intermediate layer is less likely to obstruct visibility of the responsive indicator portion from the inner surface of the absorbent article. Therefore, the indicating portion of the absorbent article has excellent indicating performance of indicating on the inner surface of the absorbent article.

[ solution 5]

The absorbent article according to any one of claims 1 to 4, wherein the intermediate layer is disposed between the absorbent body and the liquid-impermeable sheet.

In the absorbent article, the intermediate layer is disposed between the absorbent body and the liquid-impermeable sheet, and therefore the intermediate layer can temporarily store liquid and diffuse the liquid in the planar direction.

[ solution 6]

The absorbent article according to claim 5, wherein the indicator is disposed between the intermediate layer and the liquid-impermeable sheet.

In the absorbent article described above, since the indicator is disposed between the intermediate layer and the liquid-impermeable sheet, the low basis weight region of the intermediate layer is easily permeable to liquid, and liquid can quickly reach the indicator, so that the response of the indicator is less likely to be hindered by the low basis weight region of the intermediate layer, and the indicator is excellent in visibility from the outer surface of the absorbent article.

[ solution 7]

The absorbent article according to

claim

1 or 2, wherein the absorber includes an absorbent core and a core-clad layer, and the intermediate layer is disposed inside the core-clad layer.

In the absorbent article, since the intermediate layer is disposed inside the core wrap, even when physical pressure or the like is applied to the absorbent article, the liquid temporarily stored in the intermediate layer is easily transferred to the absorbent core without leaking to the outside of the absorbent article.

[ solution 8]

The absorbent article according to claim 7, wherein the absorbent core includes two absorbent core portions stacked in the thickness direction, and the intermediate layer is disposed between the two absorbent core portions.

In the absorbent article, the intermediate layer is disposed between the two absorbent core portions constituting the absorbent core, and therefore the intermediate layer can transfer the temporarily stored liquid as needed between the two absorbent core portions adjacent in the thickness direction without allowing the liquid to leak to the outside of the absorbent article. Therefore, the absorbent article is excellent in the temporary storage of liquid.

[ solution 9]

The absorbent article according to any one of claims 1 to 8, wherein the absorbent article has a longitudinal direction and a width direction constituting the planar direction,

the absorbent body includes a pair of channels extending in the length direction and separated in the width direction,

the intermediate layer is formed of an intermediate sheet having both ends in the width direction of the intermediate layer folded by a pair of folding axes extending in the longitudinal direction, and includes the low unit area weight region disposed at the center in the width direction and the high unit area weight regions disposed at both ends in the width direction,

the high area weight region is disposed to overlap each of the pair of channels in the thickness direction, and the low area weight region is disposed between the pair of channels in the plane direction.

In the case where the absorber has a predetermined path, the absorber and the absorbent article are easily guided to deform along the path when the absorbent article is worn by the wearer.

On the other hand, the channel tends to easily spread the liquid that has reached the absorbent body along the channel in the longitudinal direction, and therefore the liquid may not easily reach the indicator portion.

In the absorbent article, the high basis weight region of the intermediate layer is disposed so as to overlap each of the channels of the pair of channels in the thickness direction, and therefore the high basis weight region of the intermediate layer holds liquid and suppresses the liquid from spreading in the longitudinal direction of the absorbent body through the channels, and the low basis weight region of the intermediate layer disposed between the pair of channels allows the liquid to pass therethrough and reach the indicator, and therefore the indicator can respond to the liquid quickly. Therefore, the absorbent article is excellent in the deformation guiding property and the indication property of the indication portion.

[ solution 10]

the intermediate layer is formed of an intermediate sheet having both ends in the width direction folded by a pair of folding axes extending in the longitudinal direction, and includes the low basis weight region disposed at the center in the width direction and the high basis weight region disposed at both ends in the width direction,

the low area weight region is arranged to overlap with at least one of the pair of channels in the thickness direction, and the low area weight region is arranged between the pair of channels in the plane direction.

On the other hand, the channel tends to easily spread the liquid that has reached the absorbent body along the channel in the longitudinal direction.

In the absorbent article, the low basis weight region of the intermediate layer is arranged so as to overlap at least one of the pair of channels in the thickness direction, and therefore the low basis weight region of the intermediate layer transfers the liquid to the channel, and then the liquid can be diffused in the longitudinal direction of the absorbent body through the channel. The indicating portion is disposed in the low basis weight region of the intermediate layer, i.e., in one of the pair of channels and between the pair of channels, and therefore the channel can allow the liquid diffused in the longitudinal direction to reach the indicating portion, and therefore the indicating portion can respond to the liquid quickly. Therefore, the absorbent article is excellent in the deformation guiding property and the indication property of the indication portion. The above-described effects are further exhibited when the indicator is disposed in a region other than the crotch region of the absorbent article, for example, the indicator is disposed in the longitudinal direction so as to extend from the crotch region to the crotch region of the absorbent article.

[ solution 11]

The absorbent article according to claim 9 or 10, wherein, in the intermediate layer, the intermediate sheet is folded toward the liquid-impermeable sheet side with the pair of axes.

In the absorbent article described above, the intermediate sheet constituting the intermediate layer is folded toward the liquid-impermeable sheet side, and therefore, a gap is less likely to be generated between the sheet member adjacent to the liquid-permeable sheet side of the intermediate layer and the intermediate layer. Therefore, the intermediate layer of the absorbent article easily receives the liquid that has reached the liquid-permeable sheet from the sheet member.

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

Fig. 1 to 5 are views for explaining an absorbent article, specifically, a pants-type diaper 1 according to one embodiment (hereinafter, embodiment 1) of the present disclosure. 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). The drawings are schematic, and particularly, in fig. 3 to 5, the thickness in the thickness direction T is drawn thicker than the actual thickness for the sake 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 away 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 (the 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 (the 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 in general.

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 stacked on the stomach-side portion 2 and the other end portion stacked 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 a range in which both end

portions

2a, 2a and both

end portions

3a, 3a in the longitudinal direction L 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 extend in the width direction W in predetermined regions on both sides of the longitudinal center line CL and are arranged at intervals in the longitudinal direction L. The predetermined region is a region from the end portion 2a to a portion inside the end edge of the absorbent main body 10 facing in the width direction W. 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 extend in the width direction W in predetermined regions on both sides with respect to the longitudinal center line CL, and are arranged at intervals in the longitudinal direction L. The predetermined region is a region from the end portion 3a to a portion inside the end edge of the absorbent main body 10 facing in the width direction W. 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 which the plurality of

elastic members

6a, 6b, 7a, and 7b are arranged in the longitudinal direction L.

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 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, such as a hot melt adhesive. 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 rounded rectangular shape, a rectangular shape in which the short sides are convex curves 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 edge portion of the liquid-permeable sheet 12 are joined to the cover sheet 5.

In embodiment 1, the skin-side surface of the absorbent main body 10 includes a pair of

side sheets

17, 17 located on both sides in the width direction W and extending 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 positioned between the front and

rear fixing regions

15, 15 in the longitudinal direction L of the side sheet 17, is adjacent thereto, and is fixed at the outer end edge in the width direction W of the leakage preventing wall 16 on the skin-side surface of the absorbent main body 10, and is non-fixed at the inner end edge in the width direction W of the leakage preventing wall 16. 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 ends in the width direction W on the skin side of the absorbent main body 10, and extend continuously in 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, for example, a hydrophobic nonwoven fabric. In another embodiment, the pair of

leakage preventing walls

16, 16 are each formed of a hydrophilic sheet, for example, 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 absorbing layer 41 disposed on the skin side, a2 nd absorbing layer 42 disposed on the non-skin side, and an intermediate layer 43 disposed between the 1 st absorbing layer 41 and the 2 nd absorbing layer 42. The absorbent body 14 has a substantially rectangular planar shape extending in the longitudinal direction L.

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 viewed as having the 1 st absorbent material 45 as the absorbent core portion, and 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 slightly extends 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 absorbent material 47 as the absorbent core portion and the 2 nd substrate 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 of the absorbent body 14 in the longitudinal direction L. 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 area weight region LB having a relatively low weight per unit area and a pair of high area weight regions HB having a relatively high weight per unit area. 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 composed of a single liquid-permeable intermediate sheet 43S. The intermediate sheet 43S includes both the folding axis 103 and the folding axis 104, and is divided into a1 st sheet portion 43a disposed inside both the folding axis 103 and the folding axis 104 and a pair of 2

nd sheet portions

43b, 43b disposed outside both the folding axis 103 and the folding axis 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, with both

folding axes

103 and 104 extending in the longitudinal direction L.

In the intermediate layer 43, a single intermediate sheet 43S is folded by both the folding axis 103 and the folding axis 104, and the 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 the pair of 2

nd sheet portions

43b, 43b are disposed on the 2 nd absorbent layer 42 side in the thickness direction T. 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. Each overlapping portion OP of the pair of overlapping portions OP coincides with each high basis weight region HB of the pair of high basis weight regions HB, and the non-overlapping portion NP coincides with the low basis weight region LB.

In the intermediate layer 43, in each high unit area weight region HB (overlap portion OP) of the pair of high unit area weight regions HB (the pair of overlap portions OP), the 1 st sheet portion 43a and the 2 nd sheet portion 43b are joined by an embossed portion 43c extending along the longitudinal direction L.

In the intermediate layer 43, the fiber density of the composite fibers at the pair of embossed portions 43c is higher than the fiber density of the composite fibers at the portions other than the pair of embossed portions 43 c.

In other words, the intermediate layer 43 is divided into a pair of high fiber density portions HD composed of a pair of embossed

portions

43c and 3 low fiber density portions LD composed of portions other than the pair of embossed portions 43 c.

The pair of high fiber density portions HD extend in the longitudinal direction L and are arranged at predetermined intervals on both sides in the width direction W with respect to the longitudinal center line CL.

The pair of high fiber density portions HD tend to accumulate the liquid that has reached the 1 st absorbent layer 41 around the 1 st absorbent material 45 of the 1 st absorbent layer 41, but the liquid that has accumulated around the 1 st absorbent material 45 can be drawn into the pair of high fiber density portions HD (the pair of embossed portions 43 c) and further into the intermediate layer 43 by capillary action.

In addition, since the pair of high fiber density portions HD extend in the longitudinal direction L, respectively, it is easy to diffuse the liquid introduced into the pair of high fiber density portions HD in the longitudinal direction L in the intermediate layer 43. Next, the liquid diffused in the longitudinal direction L in the intermediate layer 43 is easily transferred to the 2 nd absorbent layer 42.

The pair of high fiber density portions HD are disposed in the pair of high basis weight regions HB (the pair of overlapping portions OP). Therefore, the amount of the composite fibers constituting the high fiber density portion HD becomes relatively large, and the liquid retained around the 1 st water-absorbent material 45 can be drawn into the pair of high fiber density portions HD (the pair of embossed portions 43 c) by capillary action, and then the liquid can be drawn into the intermediate layer 43 and temporarily stored.

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 opposite side of the web. The web side has a relatively higher density of fibers than the non-web side. Since the intermediate sheet 43S is folded with the mesh surface on the inner side, the fiber density in the intermediate layer 43 is higher than the fiber density on the skin side surface in the intermediate layer 43.

Therefore, the liquid introduced into the intermediate layer 43 is easily transferred from the skin side surface to the inside by capillary action, and 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-net 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 has excellent retention of the super absorbent polymer.

The pair of high basis weight regions HB are formed by a pair of overlapping portions OP at which the 1 st sheet portion 43a and the 2 nd sheet portion 43b are laminated in the thickness direction T. Since the 1 st sheet portion 43a and the 2 nd sheet portion 43b are not connected to each other at portions other than the pair of embossed portions 43c, the folding shaft 103, and the folding shaft 104, when liquid is introduced into the pair of high fiber density portions HD of the intermediate layer 43, the pair of overlapping portions OP constituting the pair of high basis weight regions HB can be expanded in the thickness direction T from the pair of embossed portions 43c and both the folding shaft 103 and the folding shaft 104, and the folding shaft 103, and the pair of high basis weight regions HB of the intermediate layer 43, and therefore the liquid can be temporarily stored in the pair of high basis weight regions HB (the pair of overlapping portions OP).

The pair of high fiber density portions HD is constituted by an embossed portion 43c embossed with the 1 st sheet portion 43a and the 2 nd sheet portion 43b, and the 1 st sheet portion 43a and the 2 nd sheet portion 43b are connected to each other at the embossed portion 43 c.

Therefore, even when liquid is drawn into the pair of high fiber density portions HD of the intermediate layer 43 and the pair of superposed portions OP on which the pair of high fiber density portions HD are arranged is expanded in the thickness direction T with both the folding axis 103 and the folding axis 104 as base points, the pair of high fiber density portions HD (embossed portions 43 c) can suppress twisting of the absorbent body 14.

Both end edges in the width direction W of the intermediate layer 43 are sandwiched between and joined to both end portions in the width direction W of the 1 st base material 44 and the 2 nd base material 46, and both end edges in the length direction L of the intermediate layer 43 are sandwiched between and joined 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 belt-like regions arranged in the 2 nd absorbing layer 42, extending in the longitudinal direction L, and 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 width-direction center line CW at least in the central portion in the longitudinal direction L of the 2 nd absorption layer 42.

Each passage 48 of the pair of

passages

48, 48 is a region in which the weight per unit area of the 2 nd water absorbent material 47 is smaller than the region around each passage 48 of the pair of

passages

48, 48. 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, the 2 nd water absorbing material 47 is recessed toward the intermediate layer 43.

Each channel 48 of the pair of

channels

48, 48 is arranged to overlap a pair of high basis weight regions HB (a pair of overlapping portions OP) of the intermediate layer 43 in the thickness direction T.

In addition, the pair of

passages

48, 48 are arranged so as to overlap the pair of embossed portions 43c in the thickness direction T, in other words, each high fiber density portion HD of the pair of high fiber density portions HD overlaps each passage 48 of the pair of

passages

48, 48 in the thickness direction T. This allows the liquid introduced into the pair of high fiber density portions HD of the intermediate layer 43 to move to the pair of

channels

48, 48 of the 2 nd absorbent layer 42, and the liquid to diffuse into the 2 nd absorbent layer 42 through the pair of

channels

48, 48.

In the pants-type diaper 1, an indicator 101 is disposed between the absorber 14 and the liquid-impermeable sheet 13. The indicator 101 indicates that the pants-type diaper 1 has absorbed liquid (e.g., urine) to the outer surface of the pants-type diaper 1, and serves to notify a user (e.g., mother).

The indicating portion 101 is disposed from the low basis weight region LB (non-overlapping portion NP) of the intermediate layer 43 to a pair of high basis weight regions HB (a pair of overlapping portions OP). The indicator 101 is disposed between the pair of

channels

48, 48.

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 of 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 for example, each of them is 10g/m 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 of them than in the other one of them, or may be the same in both of them. 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 ratio of the super absorbent polymers 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 absorbing material 45 and the 2 nd water absorbing material 47 are each composed of only a super absorbent polymer and do not contain a hydrophilic fiber.

Preferably, 90 to 100 mass% of the superabsorbent polymer is composed 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 basis weight of the adhesive can be appropriately adjusted so as not to significantly reduce the liquid absorbency of the absorbent body 14, 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 base material 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 covered 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 in which pulp fibers are coated with a hydrophilic binder and which has liquid permeability and liquid retention properties is used.

The 1 st substrate 44 may be formed by laminating a plurality of nonwoven fabrics, one or more of which are described above.

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 the nonwoven fabrics.

The basis weight of the 2 nd 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 located between the back-side region BA and the stomach-side region FA of the absorber 14, i.e., a region overlapping 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-arrangement 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 basis weight of the superabsorbent polymer is 5% or less of the basis weight of the superabsorbent polymer in the SAP high basis weight region 14a.

Thus, in the absorber 14, the back-side area BA includes a back-side SAP high-area-weight area BAa as the SAP high-area-weight area 14a, a back-side SAP low-area-weight area BAb as the SAP low-area-weight area 14b, and a back-side SAP non-disposition area barc as the SAP non-disposition area 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 stomach-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 weight per unit area region BAb, which is the same as the backside SAP low weight per unit area region BAb. The 2 nd absorption layer 42 is covered with the intermediate layer 43, and thus the skin side of the protruding portion, i.e., the back-side SAP low-area-weight area BAb, is covered with the intermediate layer 43 and the 1 st base material 44.

In the absorber 14, db2> dc2> da2 is defined as 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 in the longitudinal direction L as da2, db2> dc2> da2. That is, in the back-side area BA, the length of the back-side SAP low-area-weight area BAb is relatively increased, the weight per unit area of the super absorbent polymer is suppressed to be low as a whole, and the super absorbent polymer is disposed up to the rear side in the longitudinal direction L. Conduction leakage of liquid flowing to the back side although the amount is small can be easily suppressed.

In the absorbent body 14, da1> dc1 is defined 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 abdomen-side region FA, the length of the abdomen-side SAP high basis weight region FAa is relatively increased, the basis weight of the super absorbent polymer is increased as a whole, and the super absorbent polymer is arranged up to 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-arranged region barc can be relatively increased, the amount of the super absorbent polymer used in the back-side region BA with a small excretion amount can be suppressed to be low, and the length of the abdominal-side SAP non-arranged region FAc can be relatively shortened, so that the liquid in the abdominal-side region FA with a large excretion amount can be 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 up to the portion further to the rear side in the longitudinal direction L, it is possible to more easily suppress the conduction leakage of the liquid flowing to the back side although the amount is small.

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

First, the sheet for the 2 nd base material 46 is moved in the longitudinal direction L, and the hot-melt adhesive is applied to the sheet for the 2 nd base material 46. Next, the super absorbent polymer was scattered from the super absorbent polymer supply device onto both end portions and the 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 while scattering the super absorbent polymer 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 base 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. After that, 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. 6 is a diagram for explaining a pants-type diaper (not shown) according to another embodiment of the present disclosure (hereinafter, referred to as "embodiment 2"), and is a cross-sectional view of the absorbent body 14 corresponding to fig. 4.

The pants-type diaper of embodiment 2 is different from the pants-type diaper 1 of embodiment 1 in the following points.

(i) In the intermediate layer 43, the 1 st and 2

nd sheet portions

43a, 43b are not joined by embossments extending in the longitudinal direction L.

(ii) The pair of

channels

48, 48 of the 2 nd absorption layer 42 are arranged so as not to overlap the pair of high area-unit-weight regions HB (the pair of overlapping portions OP) of the intermediate layer 43 in the thickness direction T but to overlap the low area-unit-weight regions LB (the non-overlapping portions NP) in the thickness direction T.

In addition to the above, the pants-type diaper of embodiment 2 is the same as the pants-type diaper 1 of embodiment 1, and therefore, the description thereof is omitted.

In the pants-type diaper 1 according to embodiment 2, the low-basis-weight region LB of the intermediate layer 43 is disposed so as to overlap both of the pair of

channels

48, 48 in the thickness direction T, and therefore the low-basis-weight region LB of the intermediate layer 43 can transfer liquid to the pair of

channels

48, 48 and subsequently diffuse the liquid in the longitudinal direction L via the pair of

channels

48, 48. Since the indicator 101 is disposed in the low basis weight region LB of the intermediate layer 43, i.e., in the pair of

channels

48, 48 and between them, the indicator 101 can be quickly responded to the liquid because the indicator 101 can be reached by the pair of

channels

48, 48 by the liquid diffused in the longitudinal direction L.

The absorbent article of the present disclosure is not particularly limited as long as it contains a super absorbent polymer, and examples thereof include disposable diapers, incontinence pads, disposable pants, sanitary napkins, panty-type sanitary napkins, pantiliners, mattress pads, breast pads, hemorrhoid pads, sweat pads, bedsore sheets (dressing sheets), pet diapers, and pet sheets.

In the absorbent article of the present disclosure, the indicator known in the art can be used without particular limitation, and examples thereof include a humidity indicator described in patent document 1, for example, a pH indicator, and a composition containing a water-soluble dye.

The indicator can be disposed at any position in the thickness direction of the absorbent article, and the position thereof is not limited.

From the viewpoint of the effect of the present disclosure, the indicator may be, for example, in the case where the indicator is disposed so as to indicate on the outer surface of the absorbent article, (i) between the absorbent body and the liquid-impermeable sheet, for example, between the core wrap layer on the liquid-impermeable sheet side constituting the absorbent body and the liquid-impermeable sheet, (ii) inside the absorbent body, for example, between the absorbent core constituting the absorbent body and the core wrap layer on the liquid-impermeable sheet side constituting the absorbent body, or the like, and, for example, in the case where the indicator is disposed so as to indicate on the inner surface of the absorbent article, (i) between the absorbent body and the liquid-permeable sheet, for example, between the core wrap layer on the liquid-permeable sheet side constituting the absorbent body and the liquid-permeable sheet side constituting the absorbent body, or the like.

In addition, from the viewpoint of the effect of the present disclosure, it is preferable that the indicator is disposed on a side (liquid-impermeable sheet side) of the intermediate layer which is away from the liquid-permeable sheet to which the liquid first reaches.

In the absorbent article of the present disclosure, the indicator may be disposed at any position in the planar direction of the absorbent article. In order to make the indicator respond quickly, it is preferable that the indicator be disposed at least in an excretory opening contact region, a crotch region, and the like that contact an excretory opening of the wearer, and be disposed along the longitudinal direction of the absorbent article from the excretory opening contact region, the crotch region, and the like. In general, the excretory opening contact region is generally disposed at the center in the width direction of the absorbent article.

In the absorbent article of the present disclosure, it is preferable that the intermediate layer includes, in the planar direction, a low area weight region having a relatively low weight per unit area and a high area weight region having a relatively high weight per unit area, the high area weight region and the low area weight region being respectively constituted by an overlapped portion and a non-overlapped portion of the intermediate sheet folded in the thickness direction of the absorbent article at a predetermined folding axis. Thus, when the absorbent article absorbs liquid, the overlapping portion constituting the high basis weight region can be expanded in the thickness direction with the folding axis as a base point, and therefore, the liquid can be further temporarily stored.

In the absorbent article of the present disclosure, it is preferable that the intermediate sheet constituting the intermediate layer is folded toward the liquid-impermeable sheet side. This makes it difficult to form a gap between the sheet member adjacent to the liquid-permeable sheet side of the intermediate layer and the intermediate layer, and the intermediate layer easily receives the liquid that has reached the liquid-permeable sheet from the sheet member.

In the absorbent article of the present disclosure, the intermediate layer may be disposed at an arbitrary position in the thickness direction of the absorbent article. The intermediate layer can be disposed, for example, (i) between the liquid-permeable sheet and the absorbent body, (ii) between the absorbent body and the liquid-impermeable sheet, and (iii) inside the absorbent body, for example, inside a core wrap of the absorbent body including the core wrap and the absorbent core, between two absorbent core portions constituting the absorbent core, or the like.

As described above, from the viewpoint of the effect of the present disclosure, it is preferable that the intermediate layer is disposed on the side closer to the liquid-permeable sheet (liquid-permeable sheet side) where the liquid first reaches than the indicator portion.

By disposing the intermediate layer between (i) the liquid-permeable sheet and the absorbent body, the intermediate sheet can quickly temporarily store liquid when the liquid is transferred from the liquid-permeable sheet to the absorbent body.

When the intermediate layer is disposed between (i) the liquid-permeable sheet and the absorbent body and when the indicator is disposed so as to indicate on the inner surface of the absorbent article, the indicator can be disposed, for example, (i-i) between the liquid-permeable sheet and the intermediate layer, (i-ii) between the intermediate layer and the absorbent body, or (i-iii) inside the absorbent body. When the indicator is disposed between the (i-i) liquid-permeable sheet and the intermediate layer, the visibility of the indicator is improved. When the indicator is disposed between the (i-ii) intermediate layer and the absorbent body or inside the (i-iii) absorbent body, the indicator itself can be separated from the wearer by interposing the intermediate layer between the indicator and the wearer. Further, the low area weight region of the intermediate layer does not retain liquid, is easily permeable to liquid, and can allow liquid to quickly reach the indicator portion, and the low area weight region of the intermediate layer hardly blocks visibility of the responsive indicator portion from the inner surface of the absorbent article.

In the case where the intermediate layer is disposed between (i) the liquid-permeable sheet and the absorbent body and the indicating portion is disposed so as to indicate on the outer surface of the absorbent article, the indicating portion may be disposed, for example, (i-iii) inside the absorbent body, (i-iv) between the absorbent body and the liquid-impermeable sheet, or the like. When the indicator is disposed inside the (i-iii) absorbent body or between the (i-iv) absorbent body and the liquid-impermeable sheet, the low basis weight region of the intermediate layer does not retain liquid, and the indicator is easily permeable to liquid, and can quickly reach the indicator.

When the intermediate layer is disposed between (ii) the absorbent body and the liquid-impermeable sheet and when the indicator is disposed so as to indicate on the inner surface of the absorbent article, the indicator can be disposed, for example, (ii-i) between the liquid-permeable sheet and the intermediate layer, (ii-ii) between the intermediate layer and the absorbent body, (ii-iii) between the absorbent bodies, and the like. In either case, the low basis weight region of the intermediate sheet is less likely to allow liquid to be drawn into the intermediate sheet, and the response of the indicator portion is less likely to be hindered by the low basis weight region of the intermediate sheet.

When the intermediate layer is disposed between (ii) the absorbent body and the liquid-impermeable sheet and when the indicator is disposed so as to indicate on the outer surface of the absorbent article, the indicator can be disposed, for example, (ii-iii) between the absorbent bodies, (ii-iv) between the absorbent body and the intermediate layer, or (ii-v) between the intermediate layer and the liquid-impermeable sheet. When the indicator is disposed between (ii-iii) the absorbent bodies or (ii-iv) the absorbent body and the intermediate layer, the response of the indicator is less likely to be obstructed by the low basis weight region of the intermediate sheet, and the low basis weight region of the intermediate layer is less likely to obstruct the visibility of the indicator that has responded, from the outer surface of the absorbent article. Even when the indicator is disposed between the (ii-v) intermediate layer and the liquid-impermeable sheet, the response of the indicator is less likely to be hindered by the low basis weight region of the intermediate sheet, and the indicator is excellent in visibility from the outer surface of the absorbent article.

In the case where the intermediate layer is disposed inside the absorbent body (iii), particularly between two core portions constituting the absorbent core, the indication portion may be disposed so as to indicate on the inner surface or the outer surface of the absorbent article, and is preferably disposed so as to indicate on the outer surface of the absorbent article.

When the intermediate layer is disposed inside the absorbent body (iii) and the indicator is disposed on the inner surface of the absorbent article so as to indicate the indicator (for example, the indicator is disposed between the liquid-permeable sheet and the absorbent body), the liquid is less likely to be drawn into the low basis weight region of the intermediate sheet, and the response of the indicator is less likely to be hindered by the low basis weight region of the intermediate sheet.

When the intermediate layer is disposed inside the absorbent body (iii) and the indicator is disposed so as to indicate on the outer surface of the absorbent article (for example, the indicator is disposed between the absorbent body and the liquid-impermeable sheet), the low-basis-weight region of the intermediate layer easily allows liquid to pass therethrough, and liquid can quickly reach the indicator, and the low-basis-weight region of the intermediate layer hardly blocks the visibility of the responsive indicator from the inner surface of the absorbent article.

The absorbent body, particularly the absorbent core, of the absorbent article of the present disclosure comprises a superabsorbent 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 polyacrylate (particularly sodium polyacrylate) is preferable.

In the absorbent article of the present disclosure, the absorbent body, particularly the absorbent core, is not particularly limited as long as it mainly contains the super absorbent polymer, and may contain hydrophilic fibers such as pulp fibers. The absorbent body may have any structure, and may include 1 absorbent core or 2 or more absorbent cores. The absorbent body may further include the intermediate layer.

The shape of the absorbent body in plan view is not particularly limited, and examples thereof include a rectangular shape having a short side projecting in an arc shape, a rounded rectangular shape, an oval shape, 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. 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, the passage preferably extends in the longitudinal direction, and more preferably, the pair of passages extend in the longitudinal direction with the longitudinal center line interposed therebetween.

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

The pair of channels may be arranged so as to overlap with the high basis weight region of the intermediate layer in the thickness direction of the absorbent article. In addition, the low basis weight region of the intermediate layer may be disposed between the pair of channels. Thus, the high basis weight region of the intermediate sheet retains the liquid and suppresses the liquid from spreading in the longitudinal direction of the absorbent body via the channels, and the low basis weight region of the intermediate sheet disposed between the pair of channels allows the liquid to pass therethrough and reach the indicator portion, so that the indicator portion can respond to the liquid quickly.

The channels can be arranged to overlap with the low basis weight region of the intermediate layer in the thickness direction of the absorbent article. In addition, the low basis weight region of the intermediate layer can be disposed between the pair of channels. This allows the low basis weight region of the intermediate sheet to transfer liquid to the channel, and then, the liquid can be diffused in the longitudinal direction of the absorbent body through the channel. The indicating portion is disposed in the low basis weight region of the intermediate sheet, i.e., in one of the pair of channels and between the pair of channels, and therefore the channels enable the diffused liquid to reach the indicating portion, and therefore the indicating portion can respond to the liquid quickly.

In the absorbent article of the present disclosure, the above-mentioned channels refer to regions in the absorbent body where the weight per unit area of the absorbent core is smaller than the surrounding regions. The channels may have a basis weight of preferably 70% by mass or less, more preferably 50% by mass or less, and even more preferably 30% by mass or less, as compared with the area around the absorbent core, and may have a basis weight of 0% by mass. This is considered from the viewpoint of using the channel as a guide starting point of the deformation.

When the absorbent body includes a plurality of absorbent cores, the weight per unit area of the channels means the weight per unit area of each absorbent core.

In the case where the absorbent body includes a plurality of absorbent cores, each of the plurality of absorbent cores may have the channel or may not have the channel.

Claims

1. An absorbent article comprising a liquid-permeable sheet, a liquid-impermeable sheet, an absorbent body disposed between the liquid-permeable sheet and the liquid-impermeable sheet, and an intermediate layer, the absorbent body comprising a super absorbent polymer, the absorbent article having a thickness direction and a plane direction,

the absorbent article further includes an indicator portion arranged to overlap the low basis weight region in the thickness direction,

the absorbent article has a longitudinal direction and a width direction constituting the plane direction,

the high area weight region is disposed so as to overlap each of the pair of passages in the thickness direction, and the low area weight region is disposed between the pair of passages in the plane direction.

2. The absorbent article of claim 1,

the intermediate layer is constituted by an intermediate sheet folded in the thickness direction at a predetermined folding axis, and is divided into an overlapping portion where the intermediate sheet overlaps in the thickness direction and a non-overlapping portion where the intermediate sheet does not overlap in the thickness direction, and the high area weight region is constituted by the overlapping portion.

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

the intermediate layer is disposed between the liquid-permeable sheet and the absorbent body.

4. The absorbent article according to claim 3,

the indicator is disposed between the intermediate layer and the absorbent body.

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

the intermediate layer is disposed between the absorbent body and the liquid-impermeable sheet.

6. The absorbent article according to claim 5,

the indicator is disposed between the intermediate layer and the liquid-impermeable sheet.

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

the absorber includes an absorbent core and a core cladding, and the intermediate layer is disposed inside the core cladding.

8. The absorbent article of claim 7,

the absorbent core includes two absorbent core portions stacked in the thickness direction, and the intermediate layer is disposed between the two absorbent core portions.

9. The absorbent article of claim 1,

in the intermediate layer, the intermediate sheet is folded toward the liquid-impermeable sheet side by the pair of folded shafts.