CN111374829A

CN111374829A - Pants-type diaper

Info

Publication number: CN111374829A
Application number: CN201911214805.5A
Authority: CN
Inventors: 川上祐介; 高居义; 郭晓彤
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2018-12-29
Filing date: 2019-12-02
Publication date: 2020-07-07
Also published as: WO2020137424A1; CN212166014U; JP2020108741A

Abstract

Provided is a pants-type diaper which can prevent a post-treatment tape from becoming difficult to use and which can be easily disposed of after use. A pants-type diaper comprises a belly-side belt (2), a back-side belt (3), an absorbent body (10) including an absorbent body (14), and a post-treatment tape (50) which is disposed on the surface of the back-side belt on the non-skin-surface side in the center in the width direction and extends in the longitudinal direction. The end of the post-processing adhesive tape on the rear side in the length direction is provided with a label part (51). The absorbent body comprises a superabsorbent polymer. The back-side waist belt includes an elastic member (7b) extending in the width direction at a position on the rear side in the longitudinal direction of the absorber. A tape fixing region (TA) of the back-side waistband to which the post-treatment tape is fixed overlaps the absorbent body in the thickness direction at a region less than half of the front side in the longitudinal direction of the tape fixing region, or overlaps the absorbent body in the thickness direction at the entire region.

Description

Pants-type diaper

Technical Field

The present invention relates to a pants-type diaper.

Background

Pants-type diapers using an absorbent body containing a relatively large amount of Super Absorbent Polymer (SAP) as an absorbent material are known. For example, patent document 1 (japanese patent application laid-open No. 2018-505718) discloses disposable absorbent pants (pants-type diaper) provided with an absorbent structure (absorbent main body) and an elastic belt structure (waist belt). The belt structure has an inner layer, an outer layer, and an elastic member disposed between the inner layer and the outer layer.

The pants-type diaper described in patent document 1 is made small after use and discarded. As a method of making the pants-type diaper smaller, first, a front side portion (a front side portion of the abdomen-side waistband and the crotch portion) and a back side portion (a back side portion of the back-side waistband and the crotch portion) of the pants-type diaper are stacked. Then, the pants-type diaper is rolled up from the crotch portion to the waistbands in the longitudinal direction with the front side portion as the inner side in a state where the front side portion and the back side portion are overlapped. As a result, the rolled-up pants-type diaper has a small substantially cylindrical shape in which the back-side waistband covers the outer circumferential surface. Next, the post-treatment tape disposed on the back-side waistband is attached along the substantially cylindrical outer circumferential surface so as to straddle the end portion on the waist opening side, thereby fixing the substantially cylindrical state of the pants-type diaper. As a result, a pants-type diaper arranged in a small substantially cylindrical shape is formed. The user can thus put the used pants-type diapers together into a small size and easily discard the diapers.

Here, the post-treatment tape is disposed and fixed to a tape fixing region on the non-skin side surface of the central portion in the width direction of the back-side waistband. Has a strip shape. The post-treatment tape is an elongated tape coated with an adhesive on one side and folded into a strip shape extending in the longitudinal direction when not in use. The post-treatment tape is used as a tape by pinching and stretching a portion of an end portion thereof not coated with an adhesive (hereinafter, also referred to as a "label portion") during use. The label portion is generally located on the rear side in the longitudinal direction. Therefore, the user can wind the post-treatment tape in the stretched state around the outer peripheral surface of the pants-type diaper and attach the tape to the outer peripheral surface of the pants-type diaper.

Documents of the prior art

Patent document

Patent document 1: japanese Kohyo publication 2018-505718

Disclosure of Invention

Problems to be solved by the invention

When an absorbent body containing a relatively large amount of superabsorbent polymer is applied to a disposable diaper, it is considered to use an absorbent body formed by disposing the superabsorbent polymer substantially uniformly in a planar shape. In such a disposable diaper, when the superabsorbent polymer absorbs liquid (exemplified by urine) and swells after wearing, the absorbent member has increased rigidity, and the absorbent member has a shape relatively straight in the longitudinal direction. As a result, the longitudinal end of the absorber deforms the back-side waistband so as to bulge outward (non-skin side). On the other hand, since the back-side waist belt is pressed against the skin side so as to be in contact with the skin surface by the elastic member, the portion other than the portion bulging convexly by the absorber has a curved surface substantially along the skin surface. Therefore, in the back-side waistband, a step formed by a convex portion and a curved surface along the skin surface is formed at a position corresponding to the back-side edge of the absorbent body.

However, the above-mentioned post-treatment tape is generally disposed in a region where such a step is generated. In particular, if the label portion overlaps the step, the post-treatment tape deforms substantially along the step, but since there is no adhesive in the label portion, there is a possibility that the label portion separates from the main body portion of the post-treatment tape and floats. In this case, when an infant wearing a pants-type diaper rolls on, for example, the floor or bed, the label portion may be caught on the floor or the like, and the surface of the main body portion of the post-treatment tape having the adhesive may be exposed. In that case, the post-treatment tape may stick to the floor or the like and peel off from the back-side waistband. As a result, it is difficult to dispose the pants-type diaper after use.

Here, according to patent document 1, since the end portion of the absorber is held by the back-side waistband, the back-side waistband can be prevented from being deformed so as to bulge convexly at both end portions in the longitudinal direction of the absorbent main body. However, in patent document 1, the following cases are not considered: since the back-side waistband includes an elastic member, the back-side waistband may not be prevented from bulging in a convex shape to some extent, and the post-treatment tape may be peeled off from the back-side waistband. Therefore, the pants-type diaper of patent document 1 has room for improvement.

The invention aims to provide a pants-type diaper which contains a super absorbent polymer, wherein the pants-type diaper can prevent a post-treatment adhesive tape from becoming difficult to use, and is easy to arrange the pants-type diaper to be small and to be discarded after use.

Means for solving the problems

The pants-type diaper of the present invention is as follows. (1) A pants-type diaper having a longitudinal direction, a width direction, and a thickness direction that are orthogonal to each other, comprising: a ventral waistband; a back side waistband; an absorbent body located between the ventral waistband and the dorsal waistband, comprising an absorbent body; and a post-treatment tape disposed on a surface of a non-skin surface side of a central portion in the width direction of the back-side waistband, and extending in the longitudinal direction, wherein the post-treatment tape includes a label portion at an end portion on the back side in the longitudinal direction, the absorbent body includes a super absorbent polymer, the back-side waistband includes an elastic member extending in the width direction at least at a position closer to the back side in the longitudinal direction than the absorbent body, and a tape fixing region of the back-side waistband to which the post-treatment tape is fixed overlaps the absorbent body in the thickness direction at a region less than half of the front side in the longitudinal direction of the tape fixing region.

In the pants-type diaper, the tape fixing region overlaps the absorbent body in the thickness direction at a region less than half of the front side in the longitudinal direction of the tape fixing region. Therefore, when the superabsorbent polymer absorbs a liquid (exemplified by urine) and swells after wearing, the position where the step formed by swelling of the absorbent body is formed is an arbitrary position which is half of the front side in the longitudinal direction of the tape fixing region. On the other hand, the label portion is located at the end portion on the rear side in the longitudinal direction of the tape fixing region. Thus, the position of the step is largely away from the position of the label portion. Therefore, the label portion can be prevented from separating from the post-treatment tape and floating under the influence of the step, and even if the infant wearing the pants-type diaper rolls on, for example, the floor or the bed, the post-treatment tape can be prevented from peeling off the back-side waistband. Therefore, the post-treatment tape can be prevented from becoming difficult to use, and the pants-type diaper can be easily disposed of after use.

In the pants-type diaper of the present invention, (2) a pants-type diaper having a longitudinal direction, a width direction, and a thickness direction which are orthogonal to each other, comprising: a ventral waistband; a back side waistband; an absorbent body located between the ventral waistband and the dorsal waistband, comprising an absorbent body; and a post-treatment tape disposed on a surface of a non-skin surface side of a central portion in the width direction of the back-side waistband and extending in the longitudinal direction, wherein the post-treatment tape includes a label portion at an end portion on the back side in the longitudinal direction, the absorbent body includes a super absorbent polymer, the back-side waistband includes an elastic member extending in the width direction at least at a position closer to the back side in the longitudinal direction than the absorbent body, and an entire region of a tape fixing region of the back-side waistband to which the post-treatment tape is fixed overlaps with the absorbent body in the thickness direction.

In the present pants-type diaper, the tape fixing region overlaps the absorbent body in the thickness direction at the entire region of the tape fixing region. Therefore, even when the superabsorbent polymer absorbs a liquid (exemplified by urine) and swells after wearing, a step due to swelling of the absorbent body is not formed in the tape fixing region. Thus, the position of the step is largely away from the position of the label portion. Therefore, the label portion can be prevented from separating from the post-treatment tape and floating under the influence of the step, and even if the infant wearing the pants-type diaper rolls on, for example, the floor or the bed, the post-treatment tape can be prevented from peeling off the back-side waistband. Therefore, the post-treatment tape can be prevented from becoming difficult to use, and the pants-type diaper can be easily disposed of after use.

The pants-type diaper according to the present invention may be (3) the pants-type diaper according to the above (1) or (2), wherein the elastic member overlaps the label portion in the thickness direction.

The region of the back-side waistband where the elastic member is disposed is pressed against the skin side so that the back-side waistband is in close contact with the skin surface by the elastic member, and therefore, a step due to swelling of the absorber is easily formed. In the pants-type diaper, the region where the elastic member is disposed overlaps the label portion in the thickness direction, and therefore is susceptible to the influence of the step formed by swelling of the absorbent body. Therefore, the label portion can be prevented from separating from the post-treatment tape and floating.

The pants-type diaper of the present invention may be (4) the pants-type diaper according to any one of (1) to (3), wherein the absorber includes: a crotch region; a back-side region adjacent to the crotch region on a back side in the longitudinal direction of the crotch region; and a stomach-side region adjacent to the crotch region on a front side in the longitudinal direction of the crotch region, the back-side region including a low basis weight region in which a basis weight of the super absorbent polymer is lower than a basis weight of the super absorbent polymer in the crotch region, the tape fixing region overlapping with the low basis weight region in the thickness direction.

In the pants-type diaper, the low basis weight region overlaps the tape-fixed region in the thickness direction. Here, the back-side region does not need to absorb so much liquid, and therefore a low area weight region, which is relatively thin in thickness both before and after absorption of liquid, can be used therefor. Therefore, even if the superabsorbent polymer absorbs liquid to progress swelling after wearing, and a step formed by swelling of the absorbent body is formed in the tape securing region of the back-side waistband or in the vicinity thereof, the step can be made smaller because the step is formed by swelling of the low area weight region. Therefore, the label portion can be prevented from separating from the post-treatment tape and floating.

The pants-type diaper according to the present invention may be (5) the pants-type diaper according to the above (4), wherein the absorbent body includes a compressed portion formed by compressing the absorbent body in the thickness direction at least in the low basis weight region.

In the pants-type diaper, the absorbent body has a compressed portion in a low basis weight region. Therefore, even if the superabsorbent polymer absorbs liquid and undergoes swelling after wearing, the steps formed by swelling of the absorbent body at the rear end of the back-side waistband can be made smaller because swelling of the superabsorbent polymer in the low basis weight region of the absorbent body is suppressed by the compressed portion. Therefore, the label portion can be further suppressed from separating from the post-treatment tape and floating.

The pants-type diaper of the present invention may be (6) the pants-type diaper according to any one of (1) to (5), wherein the absorber further includes: 1 st absorption layer comprising the superabsorbent polymer; and a 2 nd absorbent layer which is located on a non-skin side of the 1 st absorbent layer and contains the super absorbent polymer, wherein the 2 nd absorbent layer contains a protruding portion which protrudes to an outer side than an end edge of the 1 st absorbent layer at a rear end portion in the longitudinal direction in a plan view, and the protruding portion overlaps with the tape fixing region in the thickness direction.

In the pants-type diaper, the absorber has a two-layer structure in which the 1 st absorbent layer and the 2 nd absorbent layer are laminated, and the tape fixing region overlaps with the protruding portion that is a portion of one layer of the absorber. Therefore, even if the superabsorbent polymer absorbs liquid and swells after wearing, and a step formed by swelling of the absorbent body is formed in or near the tape securing region of the back-side waistband, the step can be made small because the step is formed by swelling of the thin protruding portion. Therefore, the label portion can be prevented from separating from the post-treatment tape and floating.

The pants-type diaper according to the present invention may be (7) the pants-type diaper according to the above (6), wherein the absorber further includes an intermediate layer made of a nonwoven fabric and located between the 1 st absorbent layer and the 2 nd absorbent layer, and the skin-side surface of the low basis weight region is covered with the intermediate layer.

In the pants-type diaper, the second absorbent layer 2 is provided with an intermediate layer of nonwoven fabric on the skin side, and the skin-side surface of the low basis weight region is covered with the nonwoven fabric (intermediate layer). Therefore, the thickness of the low basis weight region can be more reliably maintained thin. Thus, even if a step is formed due to swelling of the absorbent body, the step can be reliably made smaller because the step is formed due to swelling of the thin protruding portion. Therefore, the label portion can be further suppressed from separating from the post-treatment tape and floating. In addition, when the back side portion is in close contact with the skin surface, even if the low basis weight region of the absorbent body is pressed against the skin surface, the unevenness due to the super absorbent polymer is not felt, and the uncomfortable feeling during wearing can be less felt because the skin side surface of the low basis weight region is covered with the nonwoven fabric.

ADVANTAGEOUS EFFECTS OF INVENTION

The present invention can provide a pants-type diaper comprising a super absorbent polymer, wherein the pants-type diaper can prevent a post-treatment tape from becoming difficult to use, and can be easily disposed of after use.

Drawings

Fig. 1 is a plan view showing a configuration example of a pants-type diaper according to an embodiment.

Fig. 2 is a sectional view taken along line II-II of fig. 1.

Fig. 3 is a plan view and a sectional view showing a configuration example of the absorber of the embodiment.

Fig. 4 is a partially enlarged plan view of a back side portion of the pants-type diaper according to the embodiment.

Fig. 5 is a bottom view of the dorsal portion, partially enlarged, as viewed from the non-skin side.

Fig. 6 is a partially enlarged plan view of a stomach portion of the pants-type diaper according to the embodiment.

Fig. 7 is a bottom view of the back-side portion of another embodiment, partially enlarged, as viewed from the non-skin side.

Fig. 8 is a plan view showing a structural example of an absorbent main body of a pants-type diaper according to another embodiment.

Description of the reference numerals

1 pants-type diaper; 2 ventral portion (ventral waistband); 3 dorsal side (dorsal waistband); 7b an elastic member; 10 an absorbent main body; 14 an absorbent body; 50 post-processing the adhesive tape; 51 a label part; TA tape anchor area.

Detailed Description

Hereinafter, a pants-type disposable diaper according to the embodiment (hereinafter, also simply referred to as "pants-type diaper") will be described. The type of the pants-type diaper is not limited to this example, and other types of pants-type diapers may be used without departing from the scope of the present invention. Examples of such a pants-type diaper include a 3-piece diaper.

Fig. 1 and 2 are views showing a configuration example of a pants-type diaper 1 according to an embodiment. Fig. 1 is a plan view showing a state in which a pants-type diaper 1 is unfolded, and fig. 2 is a sectional view taken along line II-II of fig. 1. 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 (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 relatively distant from the skin surface of the wearer in the thickness direction T when the pants-type diaper 1 is worn on the wearer, respectively. 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 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 curved or curved member, the member is evaluated as described above with respect to the tangent line at each point on the curve or the like.

As shown in fig. 1, the pants-type diaper 1 includes a front side portion (front side waistband) 2, a back side portion (back side waistband) 3, and an absorbent main body 10 positioned between the front side portion 2 and the back side portion 3 in a longitudinal direction L. In the present embodiment, 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 overlapping both

end portions

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

end portions

3a, 3a in the width direction W of the back side portion 3 in the thickness direction T, respectively, and joining them along the longitudinal direction L. In this case, in the pants-type diaper 1, the waist opening through which the waist of the wearer passes is defined by the outer end 2e of the stomach-side portion 2 in the longitudinal direction L and the 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 the present embodiment, in the state shown in fig. 1, each of the ventral portion 2 and the dorsal portion 3 has a rectangular shape that is expanded 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, 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 the present embodiment, 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. In this case, the portion of the covering sheet 5b at the folded-back position of the abdomen portion 2 constitutes the end 2e of the abdomen portion 2, and the portion of the covering sheet 5b at the folded-back position of the back portion 3 constitutes the end 3e of the back portion 3.

Examples of the cover sheet 5 include any liquid impermeable sheet such as a liquid impermeable nonwoven fabric, a synthetic resin film, a composite sheet thereof, an SB nonwoven fabric, and an SMS nonwoven fabric. Examples of the material of the cover sheet 5 include polyolefin materials such as polypropylene and polyethylene. The weight per unit area of the cover sheet 5 is, for example, 5g/m²～100g/m²Preferably 10g/m²～50g/m². The dimension (thickness) of the cover sheet 5 in the thickness direction T is, for example, 0.1mm to 5mm, preferably 0.1mm to 2 mm. In another embodiment, the number of the cover sheets 5 is one or three or more (not shown). In yet another embodiment, the cover sheet 5b is not folded back (not shown).

In the present embodiment, 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 5 b. 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 in the longitudinal direction L along the width direction W in predetermined regions on both sides across the longitudinal center line CL at intervals. The predetermined region is a region from the end portion 2a to a portion inside an end edge of the absorbent main body 10 in the width direction W opposed to the end portion 2 a. 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 an end edge of the absorbent main body 10 in the width direction W opposed to the end portion 3 a. 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 the present embodiment, 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 the present embodiment, the absorbent body 10 has a substantially rectangular shape, and includes a liquid-permeable front sheet 12, a liquid-impermeable back sheet 13, and an absorbent body 14 that is positioned between the front sheet 12 and the back sheet 13 and absorbs and retains liquid. Examples of the top 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 back sheet 13 include liquid-impermeable nonwoven fabric, synthetic resin film, composite sheets thereof, and SMS nonwoven fabric. The absorbent body 14 in the present embodiment includes an absorbent core for absorbing and retaining liquid and a core wrap enclosing the absorbent core. The absorbent body 14 will be described in detail later. The absorbent body 14, the front sheet 12, and the back sheet 13 are bonded together with an adhesive, and the front sheet 12 and the back sheet 13 are bonded together with an adhesive at their peripheral edge portions. The adhesive is a material known in pants-type diapers, and examples thereof include hot melt adhesives. The shape of the absorbent main body 10 is not limited to the above example 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 back 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 top sheet 12 are joined to the cover sheet 5.

In the present embodiment, the surface of the absorbent main body 10 on the skin side includes a pair of

side sheets

17 and 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 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. In this case, 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. In this manner, the absorbent main body 10 includes the pair of

leakage preventing walls

16, 16. 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. In another embodiment, the inner ends of the pair of

leakage preventing walls

16, 16 in the width direction W are folded back further outward in the width direction W (described later). In another embodiment, the number of the elastic members 61 is one or more than three. The pair of

leakage preventing walls

16, 16 are each formed of a hydrophobic sheet material, such as a hydrophobic nonwoven fabric. In another embodiment, it is 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 3. Fig. 3 is a diagram showing a configuration example of the absorbent body 14 of the embodiment, fig. 3 (a) is a plan view, and fig. 3 (b) is a cross-sectional view taken along line IIIb-IIIb in fig. 3 (a). The absorbent body 14 is a layer having liquid absorbing performance and liquid retaining performance, and in the present embodiment includes a 1 st absorbent layer 41 on the skin side, a 2 nd absorbent layer 42 on the non-skin side, and an intermediate layer 43 between the 1 st absorbent layer 41 and the 2 nd absorbent layer 42. The absorbent body 14 has a two-layer structure in which the 1 st absorbent layer 41, the intermediate layer 43, and the 2 nd absorbent layer 42 are sequentially stacked in the thickness direction T. In another embodiment, the absorbent body 14 has a single-layer structure in which the 1 st absorbent layer 41 and the 2 nd absorbent layer 42 are integrated in the thickness direction without the intermediate layer 43. In another embodiment, the absorbent body 14 has a multilayer structure of three or more layers in which another intermediate layer and another absorbent layer are further stacked between the 1 st absorbent layer 41 and the 2 nd absorbent layer 42. In another embodiment, the 1 st absorbent layer 41 is on the skin side and the 2 nd absorbent layer 42 is on the non-skin side.

In the present embodiment, the absorber 14 has a substantially rectangular planar shape extending in the longitudinal direction L. The absorbent body 14 can be considered to have the 1 st and 2 nd water

absorbent materials

45 and 47 as absorbent cores and the 1 st and 2

nd base materials

44 and 46 as core claddings. However, the shape 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 member 14 is, for example, 0.5mm to 20mm, preferably 1mm to 10 mm. The basis weight of the absorbent body 14 can be appropriately adjusted in accordance with the absorption performance required of the pants-type diaper 1, but for example, 60g/m is mentioned²～1600g/m²。

In the present embodiment, the 1 st absorbent layer 41 includes a 1 st base 44 formed of a liquid-permeable sheet and a 1 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, and the 1 st substrate 44 (and intermediate layer 43) as the core cladding. In another embodiment, the core wrap layer includes a core wrap sheet made of, for example, a wadding paper material, which is wrapped with the 1 st water absorbent material 45, on the inside of the 1 st base material 44 (and the intermediate layer 43) in addition to them. 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. However, the weight per unit area of the end portions in the longitudinal direction L and/or the width direction W may gradually decrease toward the end edges. In this case, the end portion is, for example, a region within 10% of the maximum dimension in the longitudinal direction L and/or the width direction W at both ends in the longitudinal direction L and/or the width direction W. In another embodiment, the water absorbent material of the 1 st water absorbent material 45 is disposed in a predetermined distribution having a large portion and a small portion per unit area weight in the 1 st absorbent layer 41. 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. The outer dimension in the planar direction of the 1 st absorbent layer 41 is set to, for example, the outer dimension in the planar direction of the 1 st water absorbent material 45. The outer dimension is measured at, for example, an intermediate position in the thickness direction T of the 1 st water absorbent material 45.

In the present embodiment, the 2 nd absorbent layer 42 includes a 2 nd base 46 formed of a sheet having water retentivity and liquid diffusibility, and a 2 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 side 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 and the 2 nd substrate 46 (and intermediate layer 43) as the core cladding. In another embodiment, the core wrap includes a core wrap sheet made of, for example, a wadding paper material, which wraps the 2 nd water absorbent material 47, on the inside of the 2 nd base material 46 (and the intermediate layer 43), in addition to the core wrap. 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). However, the weight per unit area of the end portions in the longitudinal direction L and/or the width direction W may gradually decrease toward the end edges. In this case, the end portions are as described above. In another embodiment, the water absorbent material of the 2 nd water absorbent material 47 is disposed in a predetermined distribution having a larger area weight portion and a smaller area weight portion within the 2 nd absorbent layer 42. 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. At this time, both end portions in the width direction W of the 2 nd base material 46 cover both side surfaces of the 2 nd water absorbent material 47, and cover skin-side surfaces of both end portions in the width direction W of the 1 st base material 44. 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. Therefore, when the end portion in the width direction W of the overlapped 2 nd base material 46 is defined as the overlapped portion P, the 2 nd base material 46 has a pair of overlapped portions P, P extending in the longitudinal direction L at both end portions in the width direction W. The outer dimension in the planar direction of the 2 nd absorbent layer 42 is set to, for example, the outer dimension in the planar direction of the 2 nd absorbent material 47. The outer dimension is measured at, for example, an intermediate position in the thickness direction T of the 2 nd water absorbent material 47.

As described above, the both end portions 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 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 another embodiment, both ends of the 1 st base 44 in the width direction W cover both ends of the 2 nd base 46 in the width direction W. That is, the 1 st base material 44 has a pair of overlapping portions P, P extending in the longitudinal direction L at both ends in the width direction W. In another embodiment, 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 width direction W.

In the present embodiment, 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 2 nd water absorbent 47 is enclosed in the 2 nd absorbent layer 42 by the 1 st base material 44 and the intermediate layer 43 in the longitudinal direction L, and the 1 st water absorbent 45 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 another embodiment, both ends of the absorbent body 14 in the longitudinal direction L are not covered with the 1 st base material 44 and the 2 nd base material 46.

In the present embodiment, the intermediate layer 43 is a liquid-permeable sheet and has a substantially rectangular planar shape. The intermediate layer 43 includes an upper layer 43a and a pair of

lower layers

43b, 43b adjacent to each other on both sides in the width direction W of the non-skin side surface of the upper layer 43 a. The intermediate layer 43 is formed by folding back and overlapping a pair of side portions located on both sides of a central portion in the width direction W toward the non-skin side of the central portion in a sheet member having a substantially rectangular planar shape. At this time, the central portion of the sheet member becomes the upper layer 43a, and the pair of side portions of the sheet member becomes the pair of

lower layers

43b, 43 b. Therefore, both sides of the intermediate layer 43 in the width direction W have a two-layer structure in which the upper layer 43a and the lower layer 43b are stacked, and have a substantially rectangular shape extending in the longitudinal direction L. The portion 43d in the vicinity of the center of the intermediate layer 43 in the width direction W has a single-layer structure of only the upper layer 43a, and has a substantially rectangular shape extending in the longitudinal direction L. The upper layer 43a and the lower layer 43b of the two-layer structure are joined by a pair of heat-

seal portions

43c, 43c extending in the longitudinal direction L on both sides in the width direction W of the portion 43 d. The heat-seal lands 43c are formed by heating and compressing. In another embodiment, the upper layer 43a and the lower layer 43b of the two-layer construction are joined with embossed portions extending along the length direction L on both sides in the width direction W of the portion 43 d. The embossed portion is formed by compression. In another embodiment, the heat-seal land and the embossed land have a shape of a plurality of dots, a plurality of curves, or a pattern. Both end edges in the width direction W of the intermediate layer 43 are sandwiched 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 both end edges in the length direction L of the intermediate layer 43 are sandwiched 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. In another embodiment, the both end edges in the longitudinal direction L are not sandwiched between the both end portions in the longitudinal direction L of the 1 st base material 44 and the 2 nd base material 46, and are not joined. By adopting the double-layer structure, the liquid can be stored temporarily, and the time required for the super absorbent polymer to absorb can be easily ensured.

In the present embodiment, the absorber 14 has a pair of

channels

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

passages

48, 48 are strip-shaped regions located on the 2 nd absorbent layer 42, extending in the longitudinal direction L, and arranged at predetermined intervals on both sides in the width direction W with respect to the longitudinal center line CL. The channel 48 is formed at least in the center portion in the longitudinal direction L so as to cross the width direction center line CW. In another embodiment, the channel 48 is formed to reach at least one of both end edges in the longitudinal direction L. The pattern of the pair of

passages

48, 48 in plan view is, for example, a pattern formed so that the interval between the two is constant along the longitudinal direction L. In another embodiment, the pattern of the pair of

passages

48, 48 is formed such that the interval between the passages is narrower near the center in the longitudinal direction L and expands toward both outer sides in the longitudinal direction L, for example. Here, the channels 48 are regions where the weight per unit area of the water-absorbent material is smaller than the regions around the channels of the absorbent body 14, and for example, regions where the weight per unit area of the water-absorbent material is smaller than the regions around the channels 48 of the 2 nd absorbent layer 42, including the case where the weight per unit area is zero. The channels 48 are formed such that the 2 nd base material 46 is recessed toward the intermediate layer 43 side, that is, such that the 2 nd water absorbing material 47 is recessed toward the intermediate layer 43 side. In another embodiment, the 2 nd water absorbent 47 is formed so as to be recessed toward the 2 nd base 46 side. The pair of

passages

48, 48 overlaps the pair of heat-

seal lands

43c, 43c in the thickness direction T. In another embodiment, at least a part of the passage 48 does not overlap with the heat-seal lands 43c in the thickness direction T. In addition, in another embodiment, the channel 48 does not extend in the longitudinal direction L but extends in the width direction W, or extends not only in the longitudinal direction L but also in the width direction W. In yet another embodiment, the channel 48 is one or more than three. In yet another embodiment, the channel 48 is formed not in the 2 nd absorption layer 42 but in the 1 st absorption layer 41, or is formed in the 1 st absorption layer 41 in addition to the 2 nd absorption layer 42. In yet another embodiment, the channel 48 is not formed.

As described above, the 1 st and 2 nd water

absorbent materials

45 and 47 contain Super Absorbent Polymers (SAP). The super absorbent polymer is not particularly limited as long as it can absorb and retain water, and examples thereof include granular or fibrous super absorbent polymers. The basis weights of the super absorbent polymers of the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 can be appropriately adjusted according to the absorption performance required for the pants-type diaper 1, but for example, the basis weights are each 10g/m²～500g/m²Preferably 100g/m²～400g/m². 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 include hydrophilic fibers such as pulp fibers and water absorbent fibers. The proportion of the super absorbent polymer to 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 to the absorbent body 14 (including not only the 1 st and 2 nd water

absorbent materials

45 and 47 but also the adhesive, the 1 st base material 44, the intermediate layer 43, and the 2 nd base material 46) is, for example, 40 to 80% by mass, preferably 50 to 80% by mass, and more preferably 60 to 80% by mass. In the present embodiment, the 1 st water absorbent material 45 and the 2 nd water absorbent materialThe material 47 is composed of only a super absorbent polymer and does not contain hydrophilic fibers. In another embodiment, the 1 st water absorbent material 45 and the 2 nd water absorbent material 47 contain pulp fibers and/or water absorbent fibers in addition to the super absorbent polymer.

Examples of the super absorbent polymer include starch-based, cellulose-based, and synthetic polymer-based polymeric absorbents. 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 crosslinked product of sodium carboxymethylcellulose. Examples of the synthetic polymer-based super absorbent polymer include polyacrylate-based, polysulfonate-based, maleic anhydride-based, polyacrylamide-based, polyvinyl alcohol-based, polyethylene oxide-based, polyaspartate-based, polyglutamate-based, polyalphamate-based, starch-based, and cellulose-based polymers. In the present embodiment, a polyacrylate-based (particularly, sodium polyacrylate-based) super absorbent polymer is preferable. In the present embodiment, it is preferable that 90 to 100 mass% of the superabsorbent polymer in the absorbent body 14 is composed of superabsorbent polymer particles having a particle diameter of 150 to 500 μm. The superabsorbent polymer particles having such a particle size distribution have a small and uniform particle size 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 each layer is, for example, 3g/m²～50g/m². Wherein each layer is 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, and the 2 nd water absorbent material 47 and the 2 nd base 46, and a layer of adhesive between the 2 nd water absorbing 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, 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 nonwoven fabric include a spunbond nonwoven fabric and a through-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), and a combination thereof. These fibers are preferably subjected to hydrophilization treatment by a known method. Alternatively, for example, an air-laid nonwoven fabric in which hydrophilic fibers such as pulp fibers and rayon fibers are coated with a hydrophilic binder, and a spunlace nonwoven fabric in which the hydrophilic fibers and the synthetic fibers are combined may be mentioned. In the present embodiment, an air-laid nonwoven fabric having liquid permeability and liquid retention properties, in which pulp fibers are coated with a hydrophilic binder, is used. Further, as the 1 st base material 44, one kind or plural kinds of the above nonwoven fabrics may be laminated in plural. The weight per unit area of the 1 st substrate 44 is, for example, 10g/m²～100g/m²Preferably 20g/m²～80g/m². The thickness of the 1 st substrate 44 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm.

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, for example, a spunbonded nonwoven fabric containing nylon and a spunlace nonwoven fabric containing rayon fibers and/or pulp fibers can be cited. The spun lace nonwoven fabric containing rayon fibers and/or pulp fibers may also contain polyolefin fibers and/or polyester fibers. In this implementationIn the embodiment, a spunlace nonwoven fabric containing rayon fibers and pulp fibers, which has liquid retentivity and liquid diffusibility, is used. Further, as the 2 nd base material 46, one kind or plural kinds of the above nonwoven fabrics may be laminated in plural. The weight per unit area of the 2 nd substrate 46 is, for example, 10g/m²～200g/m²Preferably 35g/m²～150g/m². The thickness of the 2 nd substrate 46 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm.

The intermediate layer 43 is not particularly limited as long as it is a liquid-permeable sheet. As the intermediate layer 43, for example, the same sheet as the 1 st substrate 44 can be used. The weight per unit area of the intermediate layer 43 is, for example, 10g/m²～100g/m²Preferably 15g/m²～80g/m². The thickness of the intermediate layer 43 is, for example, 0.1mm to 5mm, preferably 0.15mm to 3 mm.

In the present embodiment, as shown in fig. 3, 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 the present embodiment, the absorber 14 includes a high basis weight region 14a, a low basis weight region 14b, and a non-arrangement region 14 c. The high basis weight region 14a is a region in which the basis weight of the super absorbent polymer is 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 boundary between the high basis weight region 14a and the low basis weight region 14b is set to, for example, the outer edge of the 1 st absorbent layer 41. The low basis weight region 14b is a region in which the basis weight of the super absorbent polymer is 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 boundary between the low basis weight region 14b and the non-arrangement region 14c is set to, for example, the outer edge of the 2 nd absorption layer. The non-arrangement region 14c is a region not containing the 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 high weight-per-unit-area region 14 a. The high area weight region 14a, the low area weight region 14b, and the non-arrangement region 14c have substantially rectangular shapes. However, the shape 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. In addition, the low basis weight region 14b is a region that surrounds the periphery of the high basis weight region 14a (surrounds at least three sides) in a substantially frame shape in the longitudinal direction L and the width direction W in a plan view, and the outer dimension of the low basis weight region 14b is, for example, 5% to 25% larger than the outer dimension of the high basis weight region 14 a. The non-arrangement region 14c is a region surrounding the low basis weight region 14b in a substantially frame shape, and the outer dimension of the non-arrangement region 14c is, for example, 3% to 15% larger than the outer dimension of the low basis weight region 14 b. The weight per unit area of the low area weight region 14b is, for example, 40% to 60% of the weight per unit area of the high area weight region 14a, and the weight per unit area of the non-arrangement region 14c is, for example, 0% to 5% of the weight per unit area of the high area weight region 14 a. In the case where it is difficult to distinguish the two regions, for example, in the case where the absorbent body 14 does not have one of the 1 st absorbent layer 41 and the 2 nd absorbent layer 42, the high basis weight region is a region in which the thickness of the water absorbent material (including the adhesive) is in the range from the maximum value to 50% of the maximum value. The low basis weight region is a region in which the thickness of the water-absorbent material (including the adhesive) is in the range from 50% to 5% of the maximum value, and the non-arrangement region is a region in which the thickness of the water-absorbent material (including the adhesive) is in the range from 5% to 0% of the maximum value. The thickness is defined as an arithmetic average height (Ra: JIS B0601-2001). In another embodiment, the absorbent body 14 does not include at least one of the high basis weight region 14a, the low basis weight region 14b, and the non-arrangement region 14 c.

Thus, in the absorber 14, the back-side region BA includes a back-side high area-weight region BAa as the high area-weight region 14a, a back-side low area-weight region BAb as the low area-weight region 14b, and a back-side non-arrangement region barc as the non-arrangement region 14 c. In addition, in the absorbent body 14, the ventral region FA includes ventral high basis weight regions FAa as the high basis weight regions 14a and ventral non-disposed regions FAc as the non-disposed regions 14 c. In addition, the crotch region MA has only the high area weight region 14 a. Therefore, the basis weights of the super absorbent polymers in the back-side high basis weight region BAa and the stomach-side high basis weight region FAa are equivalent to the basis weight of the super absorbent 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. In another embodiment, the ventral region FA includes a ventral low basis weight region FAb as the low basis weight region 14b in addition to the ventral high basis weight region FAa and the ventral non-disposition region FAc.

Here, 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 a plan view. The protruding portion includes a back-side low area weight region BAb, and in the present embodiment, the protruding portion is the same as the back-side low area weight region BAb. The 2 nd absorbent layer 42 is covered with the intermediate layer 43, and thus the protruding portion, i.e., the skin side of the back-side low basis weight region BAb is covered with the intermediate layer 43 and the 1 st base material 44. In the present embodiment, the 2 nd absorbent layer 42 includes, in a plan view, widthwise protruding portions protruding outward from the end edges of the 1 st absorbent layer 41 at both ends in the widthwise direction W. The skin side of the widthwise protruding portion is covered with the intermediate layer 43 and the 1 st base material 44. In another embodiment, the 2 nd absorbent layer 42 includes another protruding portion protruding outward from the end edge of the 1 st absorbent layer 41 at the front end portion in the longitudinal direction L in a plan view. The other protrusion includes a ventral low basis weight region. In still another embodiment, the protruding portion, i.e., the skin side of the back-side low area weight region BAb is covered by one of the intermediate layer 43 and the 1 st base material 44, but not by the other. In still another embodiment, the 2 nd absorbent layer 42 does not include a width direction protruding portion protruding outward from the end edge of the 1 st absorbent layer 41 at both side end portions in the width direction W in a plan view.

In the pants-type diaper 1 of the present embodiment, the absorbent body 14 has a relatively high basis weight of the superabsorbent polymer in the crotch region MA, and a relatively low basis weight of the superabsorbent polymer in the low basis weight region (exemplified as the back-side low basis weight region BAb) in at least one of the back-side region BA and the stomach-side region FA. Therefore, since the superabsorbent polymer is disposed relatively in a large amount in the crotch region MA where liquid absorption is required, the absorbent body 14 can reliably absorb liquid (exemplified by urine) without leakage while ensuring absorption performance. On the other hand, since the superabsorbent polymer is less disposed in the low basis weight region of at least one of the back-side region BA and the stomach-side region FA, which is not required to absorb liquid, and the region is made thin, when the stomach-side portion 2 or the back-side portion 3 corresponding to the region is brought into close contact with the skin surface of the wearer, the absorbent body can be made less likely to stick into the skin surface. This makes it difficult for the wearer to feel a sense of discomfort, and improves the fit of the pants-type diaper 1. Thus, the fitting properties can be improved while ensuring the absorption performance for the pants-type diaper 1 comprising a superabsorbent polymer.

Fig. 4 is a partially enlarged plan view of the pants-type diaper according to the embodiment including the back side portion 3. In the present embodiment, the back portion 3 has a back-side low stretchable region 31 having low stretchability in the width direction W and a pair of back-side high

stretchable regions

32, 32 having high stretchability in the width direction W. The back-side low stretch region 31 is located at the center of the back-side portion 3 in the width direction W and extends rearward from the front end edge in the longitudinal direction L. The pair of back-side

high stretch regions

32 and 32 are adjacent to the back-side low stretch region 31 on both sides in the width direction W. The back-side low-stretchability region 31 has an elongation against a predetermined tensile force in the width direction W ((length after stretching-original length)/(original length)) of 1/3 or less, preferably 1/5 or less, and more preferably 1/10 or less of the elongation in the width direction W of the back-side high-stretchability region 32. For example, the back-side low stretch region 31 is a region where there is no elastic member that stretches and contracts in the width direction W, or a region where, although there is an elastic member, the elastic member does not function as an elastic member much (does not stretch and contract much). On the other hand, the back-side high stretch region 32 is a region where the elastic member 7a that stretches and contracts in the width direction W is present. Therefore, the back-side high stretch region 32 and the back-side low stretch region 31 are defined by a region where the elastic member 7a capable of functioning as an elastic member is present and a region where the elastic member capable of functioning as an elastic member is not present. In addition, "low" stretchability includes the case of no stretchability. The stretchability of each stretchable region is determined based on the stretchability of the elastic member. The back side portion 3 also has another back side high stretchability region 34 exhibiting high stretchability in the width direction W. The other back-side high stretchable region 34 is adjacent to the pair of back-side high

stretchable regions

32, 32 and the back-side low stretchable region 31 on the rear side in the longitudinal direction L in a plan view. The other back-side high stretch region 34 is a region having substantially the same elongation in the width direction W as the back-side high stretch region 32. The other backside high stretch region 34 is defined as a region where the elastic member 7b exists. Therefore, the rear end portion in the longitudinal direction L of the back portion 3 is easily pressed against the back of the wearer by the other rear highly stretchable region 34. The elastic member 7b is located on the rear side (the back side portion 3 side) in the longitudinal direction L with respect to the absorbent body 14.

In the present embodiment, the rear portion of the passage 48 in the longitudinal direction L overlaps with the rear low expansion and contraction region 31 in the thickness direction T. In addition, in a plan view, the inner end edge K1 in the width direction W of each of the pair of back-side highly

stretchable regions

32, 32 is located between the end edge 14EW opposing the back-side highly stretchable region 32 in the width direction W of the absorbent body 14 and (the end edge 48E in the width direction W of) the channel 48. The end edge K1 is substantially an inner end edge of the elastic member 7a in the width direction W. Therefore, the central portion in the width direction W of the absorbent body 14 including the portion on the rear side in the longitudinal direction L of the channel 48 is hardly elongated in the width direction W by the back-side low stretch region 31, and both end portions in the width direction W are elongated in the width direction W by the pair of back-side

high stretch regions

32, 32.

Fig. 5 is a bottom view of the dorsal portion, partially enlarged, as viewed from the non-skin side. The pants-type diaper 1 further includes a post-treatment tape 50 disposed on the surface of the non-skin surface side of the central portion in the width direction W of the back side portion 3. The post-treatment tape 50 is disposed and fixed in a tape fixing area TA located on the surface on the non-skin surface side of the central portion of the back portion 3 in the width direction W. The post-treatment tape 50 has a label portion 51 and a main body portion 52. The label portion 51 is a portion located at the end portion on the rear side in the longitudinal direction L of the post-treatment tape 50, and is a portion where no adhesive is applied. The main body 52 is a part of the post-treatment tape 50 other than the label part 51, and is an elongated strip-shaped part coated with an adhesive on one surface thereof. The label portion 51 is connected to the body portion 52, and can be said to be an end portion of the body portion 52. The post-treatment tape 50 is used as a tape by folding the main body 52 into a strip shape extending in the longitudinal direction L when not in use, and by pinching and pulling the label portion 51 when in use, stretching the main body 52.

In the present embodiment, the tape fixing region TA of the back portion 3 to which the post-treatment tape 50 is fixed overlaps the absorbent body 14 in the thickness direction T in a region less than or equal to the half of the front side in the longitudinal direction L of the tape fixing region TA. In other words, with respect to a virtual line 53 indicating a position of a half of the tape fixing region TA (or the post-treatment tape 50) in the longitudinal direction L, (an end edge on the front side in the longitudinal direction L of the absorbent body 14) is positioned on the front side in the longitudinal direction L of the virtual line 53. Therefore, the portion of the post-treatment tape 50 on the rear side in the longitudinal direction L including the label portion 51 (the portion on the rear side in the longitudinal direction L from the imaginary line 53) can be made less susceptible to the unevenness (step) formed by swelling of the absorbent body 14.

Fig. 6 is a partially enlarged plan view of the abdomen-containing portion 2 of the pants-type diaper according to the embodiment. In the present embodiment, the ventral portion 2 is substantially the same as the dorsal portion 3. That is, the ventral portion 2 has a ventral low-stretchability region 36 having a low stretchability in the width direction W and a pair of ventral high-

stretchability regions

37 and 37 having a high stretchability in the width direction W. The ventral low expansion region 36 is located at the center of the ventral portion 2 in the width direction W, and extends from the rear end edge in the longitudinal direction L to the front side. The pair of abdominal side

high stretch regions

37, 37 are adjacent to both sides of the abdominal side low stretch region 36 in the width direction W. The abdominal-side low stretch region 36 has an elongation ratio ((length after elongation-original length)/(original length)) to a predetermined tensile force in the width direction W of 1/3 or less, preferably 1/5 or less, and more preferably 1/10 or less of the elongation ratio in the width direction W of the abdominal-side high stretch region 37. For example, the abdominal-side low stretch region 36 is a region where there is no elastic member that stretches in the width direction W, or a region where, although there is an elastic member, the elastic member does not function as an elastic member much (does not stretch much). On the other hand, the ventral high-stretch region 37 is a region where the elastic member 6a is stretched in the width direction W. Therefore, the abdominal side high stretch region 37 and the abdominal side low stretch region 36 are defined by a region where the elastic member 6a capable of functioning as an elastic member is present and a region where the elastic member capable of functioning as an elastic member is absent. The stretchability of each stretchable region is determined based on the stretchability of the elastic member. The ventral portion 2 also has another ventral high-stretchability region 39 exhibiting high stretchability in the width direction W. The other abdominal side high stretch region 39 is adjacent to the pair of abdominal side

high stretch regions

37, 37 and the abdominal side low stretch region 36 on the front side in the longitudinal direction L. The other abdominal side high stretch region 39 has an elongation in the width direction W substantially equal to that of the abdominal side high stretch region 37. The other ventral high stretch region 39 is defined as a region where the elastic member 6b is present. Therefore, the front end of the abdominal section 2 in the longitudinal direction L is easily pressed against the abdomen of the wearer by the other abdominal high stretch region 39. The elastic member 6b is positioned on the front side (the abdominal portion 2 side) in the longitudinal direction L with respect to the absorbent body 14.

In the present embodiment, the front portion of the channel 48 in the longitudinal direction L overlaps the ventral low expansion region 36 in the thickness direction T. In addition, in a plan view, the inner end edge K2 in the width direction W of each of the pair of abdomen-side

high stretch regions

37, 37 is positioned between the end edge 14EW opposing the abdomen-side high stretch region 37 in the width direction W of the absorbent body 14 and (the end edge 48E in the width direction W of) the channel 48. The end edge K2 is substantially an inner end edge of the elastic member 6a in the width direction W. Therefore, the central portion in the width direction W of the absorbent body 14 including the front portion in the longitudinal direction L of the channel 48 is hardly expanded and contracted in the width direction W by the abdomen-side low stretch region 36, and both end portions in the width direction W are expanded in the width direction W by the pair of abdomen-side

high stretch regions

37, 37.

In the pants-type diaper 1 of the present embodiment, the channel 48 of the absorber 14 reaches at least one of the back portion 3 (back-side waistband) and the abdominal portion 2 (abdominal-side waistband) in the longitudinal direction L. Therefore, the liquid (exemplified by urine) can be transported and distributed to the end portion on the back side (the back side in the longitudinal direction L) and/or the abdomen side (the front side in the longitudinal direction L) of the absorbent body 14. This makes it possible to absorb the liquid by the super absorbent polymer at the rear and front ends in the longitudinal direction L of the absorbent body 14, which hardly contributes to absorption, and to effectively utilize the super absorbent polymer. Further, the end portion on the inner side in the width direction W of the high stretch region (back-side high stretch region 32, stomach-side high stretch region 37) of at least one of the back-side portion 3 and the stomach-side portion 2 of the pants-type diaper 1 is positioned between the end edge 14EW of the absorbent body 14 in the width direction W, which is opposed to the high stretch region, and the tunnel 48. That is, the center portion in the width direction W of the absorbent body 14 overlaps the low stretch region (the back-side low stretch region 31, the abdomen-side low stretch region 36) in the thickness direction T. Therefore, since the contraction force for contracting the absorbent body 14 in the width direction W is not excessively strong, it is possible to suppress a phenomenon in which the end portion on the back side in the longitudinal direction L of the absorbent body 14 before wearing contracts in the width direction W to have a convex shape. Further, portions on both sides in the width direction W of the absorbent body 14 overlap the high stretch region in the thickness direction T. Therefore, the absorbent body 14 can be pulled in the width direction W from both sides of the channel 48 by the contraction force of the high stretch region. This can suppress the phenomenon that the end portion in the longitudinal direction L of the absorbent body 14 is formed in a convex shape and the end portion in the longitudinal direction L of the absorbent main body 10 protrudes from the body of the wearer. That is, the flatness of at least one of the back portion 3 and the stomach portion 2 can be maintained before and after wearing. This can suppress leakage of liquid from the gap between the skin surface and at least one of the back portion 3 and the stomach portion 2. This can suppress a decrease in the fit of the pants-type diaper 1 and can suppress leakage of liquid.

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 sheet for the 2 nd base material 46 were folded back onto both side portions in the width direction W of the sheet for the 1 st base material 44 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 front sheet 12 is attached to the upper surface (the surface of the 1 st base 44) of the absorber 14 produced as described above, and a liquid-impermeable back sheet 13 is attached to the lower surface (the surface of the 2 nd base 46) of the absorber 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, 8), the post-treatment tape 50 is disposed on the surface of the cover sheet 5 on the non-skin surface side of the central portion in the width direction W, and the both

end portions

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

end portions

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

Next, effects of the disposable diaper 1 of the embodiment will be described. In the pants-type diaper 1 of the present embodiment, the tape fixing region TA overlaps the absorbent body 14 in the thickness direction T in a region less than half of the front side (i.e., the stomach-side portion 2 side) in the longitudinal direction L of the tape fixing region TA. In other words, the tape fixing region TA overlaps the absorbent body 14 in the thickness direction T in a region on the front side (i.e., the abdomen-side portion 2 side) of the imaginary line 53 in the longitudinal direction L of the tape fixing region TA. Therefore, when the superabsorbent polymer absorbs a liquid (exemplified by urine) and swells after wearing, the position of the step formed by swelling of the absorbent body 14 is an arbitrary position in the front half of the tape fixing region TA in the longitudinal direction L, that is, the region closer to the abdomen-side portion 2 than the virtual line 53. On the other hand, the label portion 51 is located at the end portion on the rear side (i.e., the back side portion 3 side) in the longitudinal direction L of the tape fixing area TA. Thus, the position of the step is largely away from the position of the label portion 51. Therefore, the label part 51 can be prevented from separating from the post-treatment tape 50 and floating under the influence of the step, and even if the infant wearing the pants-type diaper 1 rolls on, for example, the floor or the bed, the post-treatment tape 50 can be prevented from peeling from the back side part (back-side waistband). Therefore, the post-treatment tape 50 can be prevented from becoming difficult to use, and the pants-type diaper 1 can be easily disposed of after use.

In the present embodiment, in the pants-type diaper 1, the other back-side highly stretchable region 34, which is the region of the back-side portion 3 where the elastic member 7b is disposed, is pressed against the skin side so that the back-side portion 3 is in contact with the skin surface by the elastic member 7 b. Therefore, it is also considered that the step formed by swelling of the absorbent body 14 is easily formed. Further, since the region where the elastic member 7b is disposed (the other back-side high-stretch region 34) overlaps the label portion 51 in the thickness direction T, it is also considered that the region is easily affected by the step formed by swelling of the absorbent body 14. However, since the pants-type diaper of the present embodiment has the above-described structure, the position of the label portion 51 and the position of the step can be largely separated. Therefore, the label part 51 can be prevented from separating from the post-treatment tape 50 and floating.

In the present embodiment, the back-side low area weight region BAb overlaps the tape fixing region TA in the thickness direction T as a preferable mode. Here, the back-side area BA does not need to absorb so much liquid, and therefore, a back-side low area weight area BAb, which is relatively thin in thickness both before and after absorbing liquid, can be used therefor. Therefore, even if the superabsorbent polymer absorbs liquid to progress swelling after wearing, and a step formed by swelling of the absorbent body 14 is formed at or near the tape securing area TA of the back side portion (back-side waistband), the step can be made small because the step is formed by swelling of the back-side low-area-weight area BAb. Therefore, the label part 51 can be prevented from separating from the post-treatment tape 50 and floating.

In the present embodiment, as a preferable mode, a protruding portion of the 2 nd absorbent layer 42 protruding from the 1 st absorbent layer 41 to the rear side (the back side portion 3 side) in the longitudinal direction L overlaps the tape fixing region TA in the thickness direction T. Therefore, even if the superabsorbent polymer absorbs liquid and swells after wearing, and a step formed by swelling of the absorbent body 14 is formed in or near the tape securing region TA of the back side portion 3 (back-side waistband), the step can be made small because the step is formed by swelling of a thin protruding portion. Therefore, the label part 51 can be prevented from separating from the post-treatment tape 50 and floating. In the present embodiment, the protruding portion is substantially the rear-side low basis weight region BAb.

In the present embodiment, as a preferred mode, the absorber 14 includes an intermediate layer 43 as a nonwoven fabric on the skin side of the 2 nd absorbent layer 42, and the skin side surface of the back-side low basis weight region BAb is covered with the nonwoven fabric (intermediate layer). Therefore, the movement of the super absorbent polymer in the 2 nd absorption layer 42 can be reliably suppressed, and the thickness of the back-side low basis weight region BAb can be more reliably maintained thin. Thus, even if a step is formed by swelling of the absorbent body 14, the step can be reliably made smaller because the step is formed by swelling of the thin protruding portion. Therefore, the label part 51 can be further suppressed from separating from the post-treatment tape 50 and floating. When the back portion 3 is in close contact with the skin surface, the skin-side surface of the back-side low-basis-weight region BAb of the absorbent body 14 is covered with the nonwoven fabric, and therefore, even if the back-side low-basis-weight region BAb is pressed against the skin surface, the absorbent body does not feel irregularities due to the super absorbent polymer, and the wearer can feel less uncomfortable.

Another embodiment will be described. Fig. 7 is a bottom view of the back-side portion of another embodiment, partially enlarged, as viewed from the non-skin side. As shown in the drawing, the post-treatment tape 50 has substantially the same configuration as the case of fig. 5, but differs from the case of fig. 5 in that the entire region of the tape fixing region TA overlaps the absorbent body 14 in the thickness direction T. In the example of the figure, the entire region of the tape fixing region TA overlaps with the back-side low basis weight region BAb of the absorbent body 14 in the thickness direction T. Therefore, when the superabsorbent polymer absorbs a liquid (exemplified by urine) and swells after wearing, a step due to swelling of the absorbent body 14 is not formed in the tape fixing region TA. Thus, the position of the step is largely away from the position of the label portion 51. Therefore, the label part 51 can be prevented from separating from the post-treatment tape 50 and floating under the influence of the step, and even if the infant wearing the pants-type diaper 1 rolls on, for example, the floor or the bed, the post-treatment tape 50 can be prevented from peeling off from the back side part 3 (back-side waistband). Therefore, the post-treatment tape 50 can be prevented from becoming difficult to use, and the pants-type diaper 1 can be easily disposed of after use. In yet another embodiment, the entire region of the tape fixing region TA overlaps with the back-side high basis weight region BAa of the absorber 14 (and the portion on the back-side portion 3 side of the crotch region MA) in the thickness direction T.

Another embodiment will be described. Fig. 8 is a plan view showing a configuration example of an absorbent main body 10 of a pants-type diaper according to another embodiment. As shown in the drawing, the absorbent body 10 has substantially the same configuration as that of fig. 1 to 3, but differs from the case of fig. 1 to 3 in that the absorbent body 14 includes a compressed portion 71 formed by compressing the absorbent body 14 in the thickness direction T at least in a low basis weight region (exemplified by the back-side low basis weight region BAb). The planar shape of the compression portion 71 is not particularly limited as long as it is present in the low basis weight region (exemplified by the back-side low basis weight region BAb). In the example shown in the figure, the absorbent body 14 has a plurality of compressed sections 71, and the plurality of compressed sections 71 extend in the longitudinal direction L and are arranged in a row in the width direction W. Each compression portion 71 extends in the longitudinal direction L and has a wavy shape that alternately bulges toward one side and the other side in the width direction W. As described above, since the absorbent body 14 includes the compressed portion 71 at least in the low basis weight region, even if the superabsorbent polymer absorbs liquid and undergoes swelling after wearing, swelling of the superabsorbent polymer in the low basis weight region of the absorbent body 14 can be suppressed by the compressed portion 71. This makes it possible to reduce the steps formed by swelling of the absorbent body 14 at the rear end of the back section 3 (back-side waistband). Therefore, the label part 51 can be further suppressed from separating from the post-treatment tape 50 and floating.

The pants-type diaper of the present invention and the absorber thereof are not limited to the above-described embodiments, and known techniques can be applied by combining the embodiments without departing from the object and spirit of the present invention.

Claims

1. A pants-type diaper having a longitudinal direction, a width direction, and a thickness direction that are orthogonal to each other, comprising: a ventral waistband; a back side waistband; an absorbent body located between the ventral waistband and the dorsal waistband, comprising an absorbent body; and a post-treatment tape disposed on a surface of the back-side waistband on a non-skin surface side in a central portion in the width direction and extending in the longitudinal direction,

the end portion of the post-treatment tape on the rear side in the longitudinal direction has a label portion,

the absorbent body comprises a superabsorbent polymer,

the back-side waistband includes an elastic member extending in the width direction at least at a position on the back side in the longitudinal direction with respect to the absorbent body,

a tape fixing region of the back-side waistband to which the post-treatment tape is fixed overlaps with the absorber in the thickness direction at a region less than half of a front side of the tape fixing region in the longitudinal direction.

2. A pants-type diaper having a longitudinal direction, a width direction, and a thickness direction that are orthogonal to each other, comprising: a ventral waistband; a back side waistband; an absorbent body located between the ventral waistband and the dorsal waistband, comprising an absorbent body; and a post-treatment tape disposed on a surface of the back-side waistband on a non-skin surface side in a central portion in the width direction and extending in the longitudinal direction,

the absorbent body comprises a superabsorbent polymer,

the entire region of the tape fixing region of the back-side waistband to which the post-treatment tape is fixed overlaps with the absorbent body in the thickness direction.

3. The pant-type diaper according to claim 1 or 2,

the elastic member overlaps with the label portion in the thickness direction.

4. The pant-type diaper according to claim 1 or 2,

the absorbent body includes:

a crotch region;

a back-side region adjacent to the crotch region on a back side in the longitudinal direction of the crotch region; and

a stomach-side region adjacent to the crotch region at a front side in the longitudinal direction of the crotch region,

the back region includes a low basis weight region in which the weight per unit area of the super absorbent polymer is lower than the weight per unit area of the super absorbent polymer in the crotch region,

the tape fixing region overlaps with the low area weight region in the thickness direction.

5. The pant-type diaper according to claim 4,

the absorbent body is provided with a compressed portion, which is formed by compressing the absorbent body in the thickness direction, at least in the low basis weight region.

6. The pant-type diaper according to claim 4,

the absorbent body further includes:

1 st absorption layer comprising the superabsorbent polymer; and

a 2 nd absorbent layer located on the non-skin side of the 1 st absorbent layer and comprising the super absorbent polymer,

the 2 nd absorbent layer includes a protruding portion protruding outward from an end edge of the 1 st absorbent layer at a rear end portion in the longitudinal direction in a plan view,

the protruding portion overlaps with the tape fixing region in the thickness direction.

7. The pant-type diaper according to claim 6,

the absorbent body further comprises an intermediate layer formed of a nonwoven fabric and located between the 1 st absorbent layer and the 2 nd absorbent layer,

the skin-side surface of the low area weight region is covered with the intermediate layer.