CN111374827A

CN111374827A - Pants-type diaper

Info

Publication number: CN111374827A
Application number: CN201911214653.9A
Authority: CN
Inventors: 川上祐介; 高居义; 王茵华
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: CN212166013U; JP2020108746A; WO2020137430A1

Abstract

Provided is a pants-type diaper which can suppress a decrease in fit and can suppress leakage of liquid. A pants-type diaper includes a belly-side waistband, a back-side waistband, and an absorbent body including an absorber. The absorbent body comprises a superabsorbent polymer having at least one channel extending in a length direction. The back side waistband or the abdomen side waistband comprises: a low stretch region located at a central portion in the width direction and having low stretchability in the width direction; and a pair of high-stretch regions adjacent to the low-stretch regions on both sides in the width direction of the low-stretch regions, and having high stretchability in the width direction. A portion of at least one of the rear side and the front side in the length direction of the passage overlaps with the low stretch region in the thickness direction. The inner end edge in the width direction of the high stretchable region is located between the end edge opposite to the high stretchable region in the width direction of the absorbent body and the channel in a plan view.

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 discloses disposable absorbent pants provided with an absorbent structure and an elastic band structure. The absorbent structure includes an absorbent layer having at least one elongated channel oriented in a length direction. At least one of the front distal end and the rear distal end of the passage is disposed above the lower edge of the elastic band structure.

According to patent document 1, a channel extending in the longitudinal direction is useful for transporting and distributing a liquid (exemplified by urine) along a super absorbent polymer disposed on both sides of the channel. Thus, the channel is useful for increasing the capturing speed of the captured liquid and the absorption speed of the absorbed liquid by the super absorbent polymer. However, if there are channels extending in the longitudinal direction, the absorbent layer may have a relatively straight shape in the longitudinal direction when the super absorbent polymer absorbs liquid and swells, and both ends in the longitudinal direction of the absorbent structure may protrude from the body of the wearer. However, according to patent document 1, by holding at least one of the front distal end and the rear distal end of the tunnel at the lower edge portion of the elastic band structure, it is possible to suppress such a shape that both end portions in the longitudinal direction of the absorbent structure protrude from the body of the wearer.

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

In the pants-type diaper described in patent document 1, the absorbent main body (absorbent structure) may be pinched by both thighs in the width direction when worn. In this case, the absorber (absorbent layer) is deformed into a shape protruding toward the non-skin side extending in the longitudinal direction with the channel extending in the longitudinal direction as a fold line. In such a state, when the super absorbent polymer swells by absorbing liquid, the projected shape extending in the longitudinal direction is further reinforced, and the rigidity of the super absorbent polymer in the projected shape becomes high. As a result, the absorber has a relatively straight convex shape along the channel from one end portion to the other end portion in the longitudinal direction. In this case, the longitudinal ends of the absorber deform the waistband (elastic band structure) and hinder the flatness of the waistband. This may impair the fit of the pants-type diaper, and may cause liquid to leak from a gap formed between the waistband and the skin surface.

Here, according to patent document 1, since the end portions of the channels are held by the waist belt, it is considered that the shape in which the both end portions in the longitudinal direction of the absorbent main body protrude from the body of the wearer can be suppressed. However, the following is not considered in patent document 1: the absorbent main body is pinched by the two thighs from both sides in the width direction when worn, and the absorbent is easily deformed into a convex shape extending in the length direction from before absorbing liquid. Therefore, the pants-type diaper of patent document 1 has room for improvement.

For example, patent document 1 discloses a structure in which a belt includes an elastic member over the entire width thereof. In this case, there is a possibility that: since the contractive force of the elastic member is too strong, when the belt overlaps the channel, the belt contracts in the width direction before the diaper is worn, and the end portion of the absorbent body in the longitudinal direction contracts in the width direction and deforms into a convex shape. In this case, in addition to the possibility of reducing the fit of the diaper when worn, the absorbent body may shrink to significantly wrinkle the waistband, and the diaper may be mistaken for a defective product.

Further, patent document 1 discloses a structure in which: in the waistband, a high stretch region is formed at a position outside both ends in the width direction of the laminated absorbent main body, and a low stretch region is formed between both high stretch regions. In this case, the end portion of the absorbent body can be prevented from shrinking and becoming a convex shape before the diaper is worn. However, since the highly stretchable regions on both sides in the width direction of the absorbent body are separated from the absorbent body, it is difficult to pull the absorbent body in the width direction by the contractive force of the highly stretchable regions when the diaper absorbs liquid after being worn. Therefore, it is difficult to suppress the absorbent body from having a convex shape. That is, it is difficult to suppress the shape in which both ends in the longitudinal direction of the absorbent main body protrude from the body of the wearer by the waist belt.

Provided is a pants-type diaper which is provided with an absorber that contains a highly water-absorbent polymer and has channels, and which can suppress a decrease in the fit and can suppress leakage of liquid.

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 which are orthogonal to each other, comprising a ventral waistband, a dorsal waistband, and an absorbent main body which is positioned between the ventral waistband and the dorsal waistband and which comprises an absorbent body, wherein the absorbent body comprises a highly water-absorbent polymer and has at least one channel extending in the longitudinal direction, and at least one of the dorsal waistband and the ventral waistband comprises: a low stretch region located at a central portion in the width direction and extending outward from an inner end edge in the longitudinal direction, the low stretch region having low stretchability in the width direction; and a pair of high stretchable regions adjacent to the low stretchable region on both sides of the low stretchable region in the width direction, the pair of high stretchable regions having high stretchability in the width direction, at least one of portions of the channels on the rear side and the front side in the length direction overlapping the low stretchable region in the thickness direction, and end edges of the pair of high stretchable regions on the inner sides in the width direction being positioned between end edges of the absorbent body opposite to the high stretchable regions in the width direction and the channels in a plan view.

In the present pants-type diaper, the passage of the absorber reaches at least one of the back-side waistband and the abdomen-side waistband. Therefore, the liquid (exemplified by urine) can be transported and distributed to the end portions on the back side (rear side in the longitudinal direction) and the abdomen side (front side in the longitudinal direction) of the absorbent body. This makes it possible to absorb liquid by the super absorbent polymer at the rear and front ends of the absorbent body in the longitudinal direction, which is less likely to contribute to absorption, and to effectively utilize the super absorbent polymer.

In addition, the inner end edge in the width direction of the high stretch region of at least one of the back-side waistband and the abdomen-side waistband of the pants-type diaper is positioned between the end edge opposite to the high stretch region in the width direction of the absorbent body and the channel. That is, the widthwise central portion of the absorbent body overlaps the low stretchability region in the thickness direction. Therefore, since the contraction force for contracting the absorbent body in the width direction is not excessively strong, it is possible to suppress a phenomenon in which the end portion on the back side in the longitudinal direction of the absorbent body contracts in the width direction before wearing and becomes a convex shape.

Further, portions on both sides in the width direction of the absorbent body overlap the high stretch region in the thickness direction. Therefore, the absorbent body can be pulled in the width direction from both sides of the channel by the contraction force of the high-stretchability region. This can suppress the phenomenon that the end in the longitudinal direction of the absorbent body is formed in a convex shape and the end in the longitudinal direction of the absorbent main body protrudes from the body of the wearer.

That is, the flatness of at least one of the back-side waistband and the abdomen-side waistband can be maintained before and after wearing. This can prevent liquid from leaking from a gap between the skin surface and at least one of the back-side waistband and the abdomen-side waistband.

Thus, the pants-type diaper having an absorbent body containing a superabsorbent polymer and having channels can suppress the reduction in the fit and the leakage of liquid.

The pants-type diaper according to the present invention may be (2) the pants-type diaper according to the above (1), wherein the back-side waistband has a back-side low stretch region as the low stretch region and a pair of back-side high stretch regions as the pair of high stretch regions, and an inner end edge in the width direction of each of the pair of back-side high stretch regions is closer to an end edge in the width direction of the channel than an end edge opposite to the back-side high stretch region in the width direction of the absorbent body, in a plan view.

In the pants-type diaper, the inner end edge in the width direction of the back-side highly stretchable region is closer to the end edge in the width direction of the channel than the end edge in the width direction of the absorbent body. Therefore, the absorbent body can be pulled more strongly in the width direction from both sides of the channel by the contraction force of the backside highly stretchable region. This makes it possible to more reliably suppress the phenomenon that the end portion in the longitudinal direction of the absorbent body has a convex shape and the end portion in the longitudinal direction of the absorbent main body protrudes from the body of the wearer.

The pants-type diaper according to the present invention may be (3) the pants-type diaper according to the above (2), wherein the abdomen-side waistband has an abdomen-side low stretch region as the low stretch region and a pair of abdomen-side high stretch regions as the pair of high stretch regions, and a distance between inner end edges in the width direction of the pair of abdomen-side high stretch regions is shorter than a distance between inner end edges in the width direction of the pair of back-side high stretch regions in a plan view.

In the pants-type diaper, the distance between the pair of abdomen-side highly stretchable regions is shorter than the distance between the pair of back-side highly stretchable regions. Therefore, on the ventral side, the absorbent body can be pulled more strongly in the width direction from both sides of the channel. That is, the absorbent body can be pulled more strongly from both sides with respect to the abdomen-side waistband that is relatively close to the position where the two thighs are pinched from both sides in the width direction and have the shape that is maximally projected when worn. This makes it possible to more reliably suppress the protrusion of the longitudinal end portion of the absorbent main body from the wearer's body with respect to the abdomen-side waistband located relatively close to the position where the shape is projected to the maximum extent. Further, on the back side, by relatively weakening the force pulling the absorbent body from both sides across the channel in the width direction, a constant convex portion is formed in the absorbent body, and the absorbent body can function as a feces storage space.

The pants-type diaper of the present invention may be (4) the pants-type diaper according to the above (3), wherein the abdomen-side waistband further has another abdomen-side high stretch region which is adjacent to the pair of abdomen-side high stretch regions and the abdomen-side low stretch region on a front side in the longitudinal direction of the pair of abdomen-side high stretch regions and the abdomen-side low stretch region and which exhibits high stretchability in the width direction.

In the pants-type diaper, the pair of abdomen-side high stretch regions and the abdomen-side low stretch region further have another abdomen-side high stretch region on the front side in the longitudinal direction of the whole. Therefore, the contraction of the other abdominal side high stretch region can further pull the front portion of the abdominal side waistband in the longitudinal direction of the absorbent body in the width direction, and can further press the front portion toward the skin side. This makes it more difficult to form the convex shape of the absorber. That is, the absorbent body can be attached to the abdomen in a substantially planar shape.

The pants-type diaper of the present invention may be (5) the pants-type diaper according to any one of (2) to (4), wherein the back-side waistband further has another back-side high stretch region which is adjacent to the pair of back-side high stretch regions and the back-side low stretch region on a back side in the longitudinal direction of the pair of back-side high stretch regions and the back-side low stretch region and which exhibits high stretchability in the width direction.

In the pants-type diaper, the other back-side high stretch region is provided on the back side in the longitudinal direction of all of the pair of back-side high stretch regions and back-side low stretch regions. Therefore, the portion of the back-side waistband on the rear side in the longitudinal direction of the absorbent body can be pulled further in the width direction by the contraction of the other back-side high stretch region, and can be pressed further toward the skin side. This makes it more difficult to form the convex shape of the absorber. That is, the absorbent body can be attached to the slit portion of the buttocks in a substantially planar shape.

The pants-type diaper of the present invention may be (6) the pants-type diaper according to any one of (2) to (5), wherein an end portion of the back-side low-stretch region of the back-side waistband on the rear side in the longitudinal direction is positioned on the rear side in the longitudinal direction with respect to an end portion of the back-side waistband on the rear side in the longitudinal direction.

In the pants-type diaper, the end portion of the rear side in the longitudinal direction of the back-side low stretch region is positioned further to the rear side in the longitudinal direction than the end portion of the rear side in the longitudinal direction of the tunnel. That is, the back-side low expansion region is also present in a portion further to the back side than the end portion of the channel on the back side in the longitudinal direction. Therefore, the portion of the back-side waistband on the outer side of the back side in the longitudinal direction with respect to the tunnel is hardly pulled in the width direction, the convex shape of the absorber can be slightly maintained, and a convex portion capable of accommodating a large amount of feces can be formed in the absorber. Therefore, the end portion of the absorber in the longitudinal direction can be suppressed from being formed into a convex shape, and the feces storage space can also be secured.

The pants-type diaper according to the present invention may be (7) the pants-type diaper according to any one of (1) to (6), wherein a skin-side surface of the absorbent main body includes a pair of side sheets positioned on both sides in the width direction and extending in the longitudinal direction, and each of the pair of side sheets includes: fixing regions which are located at the front and rear end portions of the side sheet in the longitudinal direction and are fixed to the skin-side surface of the absorbent main body; and a leakage preventing wall including an elastic member extending in the longitudinal direction, the leakage preventing wall being located between the fixing regions on the front side and the rear side of the side sheet in the longitudinal direction, an outer end edge in the width direction being fixed to a skin-side surface of the absorbent main body, the inner end edge in the width direction being non-fixed, and the high stretchable region overlapping the inner end portion in the width direction with the fixing region in the thickness direction.

In the pants-type diaper, the end portion of the highly stretchable region on the inner side in the width direction overlaps the fixed region in the thickness direction. Therefore, the high stretchable region is contracted in the width direction, so that the end portion in the longitudinal direction of the absorbent body (absorbent main body) can be pulled in the width direction, and the leakage preventing wall can be pulled to the outside in the width direction and the longitudinal direction via the fixing region. This can suppress the end portion of the absorbent body in the longitudinal direction from being convex, and can easily raise the leakage preventing wall to suppress liquid leakage in the width direction.

The pants-type diaper according to the present invention may be (8) the pants-type diaper according to any one of (1) to (7), wherein the path includes two paths extending in the longitudinal direction and arranged at an interval in the width direction.

In the present pants-type diaper, the two channels extending in the longitudinal direction are provided, and therefore, it is possible to more efficiently transport and distribute liquid along the super absorbent polymer disposed in the absorbent body in the longitudinal direction, whereby the speed of capturing and absorbing can be further increased. However, the channels are two in number, and therefore the absorber is easily deformed by the concave-convex shape extending in the longitudinal direction with the channels as a broken line. In this case, the rigidity of the uneven shape is further improved, the flatness of the waistband is impaired, and the fitting property of the pants-type diaper may be impaired, and liquid may leak from a gap formed between the waistband and the skin surface. Therefore, in the present pants-type diaper, since the above-described respective configurations are provided such that the respective inner end edges in the width direction of the pair of highly stretchable regions are positioned between the end edges in the width direction of the absorbent body and the channels in a plan view, it is possible to suppress a decrease in the planarity of the waistband, suppress a decrease in the adhesiveness of the pants-type diaper, and suppress leakage of liquid from the gap formed between the waistband and the skin surface.

The pants-type diaper according to the present invention may be (9) the pants-type diaper according to any one of (1) to (8), wherein the absorber has a rectangular shape in plan view.

In the pants-type diaper, since the absorbent member has a rectangular shape in plan view, the super absorbent polymer can be efficiently disposed in the absorbent member. However, the absorbent body is rectangular in shape, and therefore the absorbent body is easily pinched by the two thighs from both sides in the width direction when worn, and is easily deformed by the convex shape extending in the length direction with the channel as a broken line. In this case, the flatness of the waistband may be impaired, which may impair the fit of the pants-type diaper, and liquid may leak from a gap formed between the waistband and the skin surface. Therefore, in the present pants-type diaper, since the respective inner end edges in the width direction of the pair of highly stretchable regions are positioned between the end edges in the width direction of the absorbent body and the channels in a plan view, it is possible to suppress a decrease in the planarity of the waistband, suppress a decrease in the fit of the pants-type diaper, and suppress liquid leakage from the gap between the waistband and the skin surface.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, there can be provided a pants-type diaper provided with an absorber containing a highly water-absorbent polymer and having channels, wherein the pants-type diaper can suppress a decrease in fit and can suppress leakage of liquid.

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

Fig. 6 is a schematic view illustrating an effect of the pants-type diaper according to the embodiment.

Fig. 7 is a schematic view illustrating an effect of the pants-type diaper according to the embodiment.

Description of the reference numerals

1: pants-type diaper

2: ventral part (ventral girdle)

3: back side part (Back side belt)

10: absorbent body

14: absorbent body

31: low expansion area of backside

32: high expansion area of back side

48: channel

K. 14 EW: end edge

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, 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 liquid-impermeable nonwoven fabric and synthetic resin filmAny liquid-impermeable sheet such as a composite sheet thereof, SB nonwoven fabric, and 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 fixing regions

15, 15 in the longitudinal direction L of the side sheet 17, is adjacent to the fixing regions 15, fixes the outer end edge in the width direction W to the skin-side surface of the absorbent main body 10, and sets the inner end edge in the width direction W as an unfixed end edge. 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 pair of

leakage preventing walls

16 and 16 are folded back such that the inner ends in the width direction W are further folded back toward the outer sides in the width direction W. 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, 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 a1 st absorbent layer 41 on the skin side, a2 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 a1 st base 44 formed of a liquid-permeable sheet and a1 st absorbent material 45 having a water-absorbent material containing a water-absorbent polymer and disposed on the intermediate layer 43 side of the 1 st base 44. The 1 st absorbent layer 41 can be viewed as having the 1 st absorbent material 45 as the absorbent core, 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 be gradually reduced toward the 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 (outer edge) of the 1 st absorption layer 41 in the plane direction is, for example, the outer dimension (outer edge) of the 1 st water-absorbent material 45 in the plane direction. The outer dimension (outer edge) is measured at, for example, a middle 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 a2 nd base 46 formed of a sheet having water retentivity and liquid diffusibility, and a2 nd water-absorbent material 47 having a water-absorbent material containing a water-absorbent polymer and disposed at a position closer to the intermediate layer 43 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 base 46 (and intermediate layer 43) as the core wrap. 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 be gradually reduced toward the 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. The outer dimension (outer edge) of the 2 nd absorption layer 42 in the plane direction is, for example, the outer dimension (outer edge) of the 2 nd water-absorbent material 47 in the plane direction. The outer dimension (outer edge) 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. 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 across 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 in such a manner that the 2 nd base material 46 is recessed toward the intermediate layer 43 side, that is, 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.

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. Superabsorbent polymer toThe ratio of the 1 st water absorbing material 45 to the 2 nd water absorbing 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 material 47 are composed of only a super absorbent polymer and do 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 for example, the basis weight of each layer of adhesive is 3g/m²～50g/m². 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, a layer of the adhesive between the 2 nd water absorbent material 47 and the 2 nd base 46, and a layer of the adhesive between the 2 nd water absorbent material 47 and the intermediate layer 43.

The 1 st base material 44 is not particularly limited as long as it is a liquid-permeable sheet. Examples of the 1 st substrate 44 include a liquid-permeable nonwoven fabric, 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. No. 1 base materialThe thickness of 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 the present embodiment, a spunlace nonwoven fabric containing rayon fibers and pulp fibers, which has liquid retention and liquid diffusion properties, 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 area weight region 14a and the low area weight region 14b is, for example, the outer edge of the first absorption layer 41 1. 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 area weight region 14b and the non-arrangement region 14c is, 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 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 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 a range from the maximum value to 50% of the maximum value. The low basis weight portion is a region in which the thickness of the water-absorbent material (including the adhesive) is in a 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 a range from 5% to 0% of the maximum value. The thickness is 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 L. 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 skin side of the protruding portion, i.e., the back-side low basis weight region BAb, is covered with either one of the intermediate layer 43 and the 1 st base material 44, but not 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 present embodiment, in the absorber 14, db2> dc2> da2 when the length of the back-side high area-weight region BAa is da2, the length of the back-side low area-weight region BAb is db2, and the length of the back-side non-disposition region barc is dc2 in the longitudinal direction L. That is, in the back-side area BA, the length of the back-side low area weight area BAb is made relatively long, the weight per unit area of the super absorbent polymer is suppressed to be low as a whole, and the super absorbent polymer is arranged in the rear portion in the longitudinal direction L. Conduction leakage of liquid flowing to the back side can be easily suppressed even if the amount is small.

In the present embodiment, in the absorber 14, da1> dc1 where da1 represents the length of the abdomen-side high basis weight region FAa and dc1 represents the length of the abdomen-side non-arrangement region FAc in the longitudinal direction L. That is, in the abdomen-side region FA, the length of the abdomen-side high basis weight region FAa is made relatively long, the basis weight of the super absorbent polymer is increased as a whole, and the super absorbent polymer is arranged at the front end in the longitudinal direction L. The liquid on the ventral side, which is excreted in a large amount, can be easily and reliably absorbed.

In the present embodiment, dc2> dc1 in the longitudinal direction L in the absorber 14. The length of the back-side non-arranged region barc can be made relatively long, the amount of the super absorbent polymer used in the back-side region BA having a small excretion amount can be suppressed to be low, and the length of the abdomen-side non-arranged region FAc can be made relatively short, so that the liquid in the abdomen-side region FA having a large excretion amount can be reliably absorbed.

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

In the present embodiment, the weight per unit area of the superabsorbent polymer in the ventral high basis weight region FAa is greater than the sum of the weight per unit area of the superabsorbent polymer in the dorsal high basis weight region BAa and the weight per unit area of the superabsorbent polymer in the dorsal low basis weight region BAb. The amount of the super absorbent polymer used in the back-side area BA having a small excretion amount can be suppressed to be low, and the liquid in the stomach-side area FA having a large excretion amount can be reliably absorbed.

In the present embodiment, a printed film (not shown) is disposed between the back portion 3 and the back area BA of the absorbent body 14. The printed film is provided with a design or pattern on the outside through the cover sheet 5 of the back side portion 3.

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 of the back-side low stretch region 31 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 elongation-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, the lower stretchability includes the case of no stretchability. The stretchability of each stretchable region is determined based on the stretchability of the elastic member.

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.

In the present embodiment, 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 closer to the end edge 48E in the width direction W of the channel 48 than the end edge 14EW opposing the back-side highly stretchable region 32 in the width direction W of the absorbent body 14. Thus, both end portions in the width direction W in the absorbent body 14 including the rear side portion in the longitudinal direction L of the channel 48 are more elongated in the width direction W by the pair of back-side highly

stretchable regions

32, 32.

In the present embodiment, the back portion 3 further 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 of the pair of back-side high

stretchable regions

32, 32 and the back-side low stretchable region 31 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.

In the present embodiment, in the back portion 3, the rear end portion 31E of the back-side low-stretchability region 31 in the longitudinal direction L is located further to the rear side in the longitudinal direction L than the rear end portion of the duct 48 in the longitudinal direction L. Therefore, the rear end of the absorbent body 14 in the longitudinal direction L is less likely to be pressed against the back of the wearer by the rear low stretch region 31.

In the present embodiment, the inner end of the back-side high-stretch region 32 in the width direction W overlaps the fixing region 15 in the thickness direction T. Therefore, the fixed region 15 is likely to be elongated at least toward the outside in the width direction W by the back-side high-stretch region 32.

In the present embodiment, the back-side low stretchable region 31 of the back-side portion 3 overlaps the back-side low area weight region BAb and the back-side high area weight region BAa in a plan view. The ventral low expansion region 36 of the ventral portion 2 overlaps with the ventral high basis weight region FAa in plan view. Therefore, since each of the high and low basis weight regions can be suppressed from shrinking in the width direction W, a decrease in absorption performance due to shrinkage of the absorbent body 14 can be suppressed.

In the present embodiment, the other back side high stretch region 34 of the back side portion 3 overlaps with a region of the absorbent body 14 that is further outside in the longitudinal direction L than the back side low basis weight region BAb. The other abdominal-side high stretch region 39 of the abdominal portion 2 overlaps with a region of the absorbent body 14 that is located further outward in the longitudinal direction L than the abdominal-side high basis weight region FAa. Therefore, by the contraction of the other high stretch regions 34 and 39, the portion of the back side portion 3 located outside the high/low basis weight region of the absorbent body 14 in the longitudinal direction L and the portion of the stomach side portion 2 located outside the high/low basis weight region of the absorbent body 14 in the longitudinal direction L can be further pulled in the width direction, and the portions can be further pressed toward the skin side.

Fig. 5 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 the abdominal side low stretch region 36 on both sides of the abdominal side low stretch region 36 in the width direction W. The ventral low-stretchability region 36 has an elongation against a predetermined tensile force in the width direction W ((length after elongation-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 ventral high-stretchability 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 the region where the elastic member 6a capable of functioning as an elastic member is present and the 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.

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 present embodiment, in a plan view, the distance between the inner end edges K2, K2 in the width direction W of the pair of abdominal side high stretching regions 37, 37 is equal to the distance between the inner end edges K1, K1 in the width direction W of the pair of back side

high stretching regions

32, 32. In another embodiment, the distance between the inner end edges K2, K2 in the width direction W of the pair of abdominal side highly stretchable regions 37, 37 is shorter than the distance between the inner end edges K1, K1 in the width direction W of the pair of back side highly

stretchable regions

32, 32 in a plan view. In this case, both end portions in the width direction W of the front portion in the longitudinal direction L of the absorbent body 14 are further extended in the width direction W by the pair of abdomen-side high stretch regions 37, 37.

In the present embodiment, the ventral portion 2 further has another ventral high-stretchability region 39 exhibiting high stretchability in the width direction W. The other abdominal high stretch region 39 is adjacent to the pair of abdominal high stretch regions 37, 37 and the abdominal low stretch region 36 on the front side in the longitudinal direction L of the pair of abdominal high stretch regions 37, 37 and the abdominal low stretch region 36. 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.

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, and 8), and both

ends

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

ends

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

Fig. 6 and 7 are schematic views illustrating effects of the pants-type diaper according to the embodiment. Fig. 6 (a), (b), and fig. 7 (a) show a conventional pants-type diaper, and fig. 6 (c), and fig. 7 (b), (c) show a pants-type diaper according to the present embodiment. First, in the pants-type diaper 1, as described above, the channel 48 of the absorber 14 reaches at least one of the back side portion 3 (back-side waistband) and the abdominal side portion 2 (abdominal-side waistband). Therefore, the liquid (exemplified by urine) can be transported and distributed to the end portions on the back side (the back side in the longitudinal direction L) and 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.

Here, referring to fig. 6 (a), a case is considered in which the back portion 103 (waistband) is provided with an elastic member in the entire width direction W as in the example of patent document 1. In this case, the contractive force of the elastic member in the width direction W is too strong. Therefore, when the tunnel overlaps the back-side portion 103, there is a possibility that the end portion in the longitudinal direction L of the absorber 114 contracts in the width direction W to be deformed into a convex shape before the diaper is worn due to contraction of the back-side portion 103 in the width direction W. In this case, in addition to the possibility of reducing the fit of the diaper when worn, the absorbent body 114 may shrink to significantly wrinkle the back side portion 103, and the diaper may be mistaken for a defective product.

As another example of patent document 1, a case is considered in which the back portion 103 (waistband) has

high stretch regions

132, 132 at positions outside both ends of the absorbent body 114 in the width direction W, and a low stretch region 131 between the high stretch regions 132, as shown in fig. 6 (b). In this case, the end portions of the absorbent body 114 can be prevented from contracting in the width direction W and becoming convex before the diaper is worn. However, the

high stretch regions

132, 132 located on both sides of the absorbent body 114 in the width direction W are separated from the absorbent body 114. Therefore, when the diaper absorbs liquid after being worn, it is difficult to pull the absorbent body 114 in the width direction W by the contractive force of the

high stretch regions

132, 132. Therefore, as shown in fig. 7 (a), it is difficult to suppress the absorber 114 from having a convex shape. That is, it is difficult for the back portion 103 (or the abdomen portion 102) to suppress both ends of the absorber 114 in the longitudinal direction L from protruding from the body of the wearer (see the arrow in fig. 7 a).

On the other hand, referring to fig. 6 (c), consider the case of the pants-type diaper 1 of the present embodiment. In this case, in the pants-type diaper 1, the inner end edge K1 in the width direction W of the back-side highly stretchable region 32 of the back-side portion 3 (back-side waistband) is positioned between the end edge 14EW opposing the highly stretchable region in the width direction W of the absorbent body 14 and the tunnel 48. That is, the center portion in the width direction W of the absorbent body 14 overlaps with the back-side low stretch region 31 in the thickness direction T. Alternatively, the inner end edge K2 of the abdominal-side high stretch region 37 in the width direction W of the abdominal-side portion 2 (abdominal-side waistband) is positioned between the end edge 14EW of the absorbent body 14 in the width direction W, which faces the high stretch region, and the channel 48. That is, the center portion in the width direction W of the absorbent body 14 overlaps with 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 with the back side high stretch region 32 or the stomach side high stretch region 37 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 these high-stretchability regions. Thus, when the diaper absorbs liquid after being worn, the absorbent body 14 shown in fig. 7 (b) can be brought into the state shown in fig. 7 (c), and it is possible to suppress a phenomenon in which the end portion in the longitudinal direction L of the absorbent body 14 is formed into a convex shape and the end portion in the longitudinal direction L of the absorbent body 14 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. Thus, the pants-type diaper 1 including the absorbent body 14 containing the super absorbent polymer and having the channels 48 can suppress the leakage of the liquid while suppressing the decrease in the fit.

In the present embodiment, as a preferable mode, the inner end edge K1 in the width direction W of the back-side highly stretchable region 32 is closer to the end edge 48E in the width direction W of the channel 48 than the end edge 14EW opposing the back-side highly stretchable region 32 in the width direction W of the absorbent body 14 in plan view. Therefore, the absorbent body 14 can be pulled more strongly in the width direction W from both sides of the channel 48 by the contractive force of the back-side highly stretchable region 32. This can more reliably suppress the phenomenon in which the end portion in the longitudinal direction L of the absorbent body 14 has a convex shape and the end portion in the longitudinal direction L of the absorbent main body 10 (absorbent body 14) protrudes from the body of the wearer.

In the present embodiment, as a preferable mode, the distance between the inner end edges K2, K2 in the width direction W of the pair of abdominal side high stretching regions 37, 37 is shorter than the distance between the inner end edges K1, K1 in the width direction W of the pair of back side

high stretching regions

32, 32 in a plan view. Therefore, on the ventral side, the absorbent body 14 can be pulled more strongly from both sides of the channel 48 in the width direction W. That is, the absorbent body 14 can be pulled more strongly from both sides with respect to the abdominal portion 2 (abdominal waistband) that is relatively close to the position where the two thighs are pinched from both sides in the width direction W and the shape is projected most when worn. This makes it possible to more reliably suppress the protrusion of the end portion in the longitudinal direction L of the absorbent main body 10 (absorbent body 14) from the body of the wearer with respect to the abdomen portion 2 relatively close to the position where the shape is maximally convex. Further, on the back side, by relatively weakening the force of pulling the absorbent body 14 from both sides across the channel 48 in the width direction W, a constant convex portion is formed in the absorbent body 14, and the absorbent body can function as a feces storage space.

In the present embodiment, as a preferred mode, the abdominal portion 2 (abdominal-side waist band) further includes another abdominal-side high stretch region 39 on the front side in the longitudinal direction L of all of the pair of abdominal-side high stretch regions 37, 37 and the abdominal-side low stretch region 36. Therefore, the contraction of the other abdominal side high stretch region 89 can further pull the front portion of the abdominal side portion 2 in the longitudinal direction L from the absorbent body 14 in the width direction W, and can further press the front portion toward the skin side. This makes it more difficult to form the convex shape of the absorbent body 14. That is, the absorbent body 14 can be attached to the abdomen in a substantially planar shape.

In the present embodiment, as a preferred mode, the back portion 3 (back-side waist band) further includes another back-side high stretch region 34 on the back side in the longitudinal direction L of all of the pair of back-side high stretch regions 32 and the back-side low stretch region 31. Therefore, the contraction of the other back-side high stretch region 34 can further pull the portion of the back-side portion 3 on the rear side in the longitudinal direction L from the absorbent body 14 in the width direction W, and can further press the portion toward the skin side. This makes it more difficult to form the convex shape of the absorbent body 14. That is, the absorbent body 14 can be attached to the slit portion of the buttocks in a substantially planar shape.

In the present embodiment, as a preferable mode, the rear end portion of the back-side low expansion/contraction region 31 in the longitudinal direction L is located further rearward in the longitudinal direction L than the rear end portion of the duct 48 in the longitudinal direction L. That is, the back-side low expansion region 31 is also present in a portion further to the rear side than the rear-side end portion in the longitudinal direction L of the duct 48. Therefore, the portion of the back portion 3 (back-side waistband) on the outer side of the rear side in the longitudinal direction L with respect to the channel 48 is hardly pulled in the width direction W, and the convex shape of the absorbent body 14 can be slightly maintained, and a convex portion capable of accommodating a little stool can be formed in the absorbent body 14. Therefore, the end portion of the absorbent body 14 in the longitudinal direction L is suppressed from being formed into a convex shape, and a feces storage space is also ensured.

In the present embodiment, as a preferred mode, the absorbent main body 10 includes a pair of side sheets 17, each side sheet 17 has

fastening regions

15, 15 and a leakage preventing wall 16, and an inner end portion in the width direction W of the back-side high stretchable region 32 or the abdomen-side high stretchable region 37 overlaps the fastening region 15 in the thickness direction T. Therefore, the back-side high stretch region 32 or the abdomen-side high stretch region 37 contracts in the width direction W, and the ends in the longitudinal direction L of the absorbent body 14 (absorbent body 10) can be pulled in the width direction W, and the leakage preventing walls 16 can be pulled outward in the width direction W and the longitudinal direction L by the fixing regions 15. This can suppress the end portion of the absorbent body 14 in the longitudinal direction L from being convex, and can easily raise the leakage preventing wall 16 to suppress liquid leakage in the width direction W.

In the present embodiment, the channel 48 preferably includes two channels 48 extending in the longitudinal direction L and arranged at intervals in the width direction W. Therefore, the liquid can be more efficiently transported and distributed along the super absorbent polymer arranged in the absorbent body 14 in the longitudinal direction L, whereby the speed of capturing and absorbing can be further increased. However, the passages 48 are two in number, and therefore the absorbent body 14 is easily deformed by the concave-convex shape extending in the longitudinal direction L with the passages 48 as a folding line. In this case, the rigidity of the uneven shape is further improved, the flatness of the back side portion 3 and the stomach side portion 2 (waistband) is impaired, and the fitting property of the pants-type diaper 1 may be impaired, and liquid may leak from the gap formed between the back side portion 3 and the stomach side portion 2 and the skin surface. Therefore, the pants-type diaper 1 has the above-described configurations such that the back-side highly stretchable region 32, the inner end edge K1 in the width direction W of the abdomen-side highly stretchable region 37, and the end edge K2 are positioned between the end edge 14EW in the width direction W of the absorbent body 14 and the tunnel 48 in a plan view. Therefore, a decrease in the flatness of the back side portion 3 and the stomach side portion 2 can be suppressed, a decrease in the fit of the pants-type diaper 1 can be suppressed, and leakage of liquid from gaps that occur between the back side portion 3 and the stomach side portion 2 and the skin surface can be suppressed.

In the present embodiment, since the absorbent body has a rectangular shape in plan view as a preferable mode, the super absorbent polymer can be efficiently disposed in the absorbent body 14. However, the absorbent body 14 has a rectangular shape, and therefore the absorbent body 14 is easily pinched by two thighs from both sides in the width direction W when worn, and is easily deformed by the convex shape extending in the length direction L with the channel 48 as a broken line. In this case, the flatness of the back side portion 3 and the stomach side portion 2 (waistband) may be impaired, and the fitting property of the pants-type diaper 1 may be impaired, and liquid may leak from the gap formed between the back side portion 3 and the stomach side portion 2 and the skin surface. Therefore, the pants-type diaper 1 has the above-described configurations such that the back-side highly stretchable region 32, the inner end edge K1 in the width direction W of the abdomen-side highly stretchable region 37, and the end edge K2 are positioned between the end edge 14EW in the width direction W of the absorbent body 14 and the tunnel 48 in a plan view. Therefore, a decrease in the flatness of the back side portion 3 and the stomach side portion 2 can be suppressed, a decrease in the fit of the pants-type diaper 1 can be suppressed, and leakage of liquid from gaps that occur between the back side portion 3 and the stomach side portion 2 and the skin surface can be suppressed.

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 which are orthogonal to each other, comprising a front waistband, a back waistband, and an absorbent body which is positioned between the front waistband and the back waistband and which includes an absorbent body,

the absorbent body comprises a superabsorbent polymer having at least one channel extending along the length direction,

at least one of the dorsal and ventral waistbands has:

a low stretch region located at a central portion in the width direction and extending outward from an inner end edge in the longitudinal direction, the low stretch region having low stretchability in the width direction; and

a pair of high-stretchability regions adjacent to the low-stretchability region on both sides of the low-stretchability region in the width direction, the pair of high-stretchability regions having high stretchability in the width direction,

a portion of at least one of a rear side and a front side in the length direction of the passage overlaps with the low stretch region in the thickness direction,

the respective inner end edges in the width direction of the pair of highly stretchable regions are positioned between the end edge of the absorbent body opposite to the highly stretchable region in the width direction and the channel in a plan view.

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

the back-side waist belt has a back-side low stretch region as the low stretch region and a pair of back-side high stretch regions as the pair of high stretch regions,

in a plan view, the inner end edges in the width direction of each of the pair of back-side highly stretchable regions are closer to the end edges in the width direction of the channels than the end edges of the absorbent body that are opposite to the back-side highly stretchable regions in the width direction.

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

the abdominal-side lap belt has an abdominal-side low stretch region as the low stretch region and a pair of abdominal-side high stretch regions as the pair of high stretch regions,

the distance between the inner end edges in the width direction of the pair of ventral-side high-stretchability regions is shorter than the distance between the inner end edges in the width direction of the pair of dorsal-side high-stretchability regions in a plan view.

4. The pant-type diaper according to claim 3,

the abdominal-side lap belt further has another abdominal-side high stretch region which is adjacent to the pair of abdominal-side high stretch regions and the abdominal-side low stretch region on the front side in the longitudinal direction of the pair of abdominal-side high stretch regions and the abdominal-side low stretch region and which exhibits high stretchability in the width direction.

5. The pant-type diaper according to any one of claims 2 to 4, wherein,

the back-side waist belt further has another back-side high stretch region adjacent to the pair of back-side high stretch regions and the back-side low stretch region on a back side in the length direction of the pair of back-side high stretch regions and the back-side low stretch region and exhibiting higher stretchability in the width direction.

6. The pant-type diaper according to any one of claims 2 to 4, wherein,

an end portion of the back side low stretch region of the back side waistband on the longitudinal direction is located further to the back side in the longitudinal direction than an end portion of the back side waistband on the longitudinal direction.

7. The pants-type diaper according to any one of claims 1 to 4,

the surface of the absorbent main body on the skin side includes a pair of side sheets located on both sides in the width direction and extending in the length direction,

the pair of side sheets each have:

fixing regions which are located at the front and rear end portions of the side sheet in the longitudinal direction and are fixed to the skin-side surface of the absorbent main body; and

a leakage preventing wall including an elastic member extending in the longitudinal direction, the leakage preventing wall being positioned between the fixing regions on the front side and the rear side in the longitudinal direction of the side sheet, an outer end edge in the width direction being fixed to a skin-side surface of the absorbent main body, an inner end edge in the width direction being non-fixed,

an end portion of the high stretch region on an inner side in the width direction overlaps with the fixing region in the thickness direction.

8. The pants-type diaper according to any one of claims 1 to 4,

the channel includes two channels extending in the longitudinal direction and arranged at intervals in the width direction.

9. The pants-type diaper according to any one of claims 1 to 4,

the absorber has a rectangular shape in plan view.