CN113795228A

CN113795228A - Absorbent article and method for manufacturing absorbent article

Info

Publication number: CN113795228A
Application number: CN202080034417.3A
Authority: CN
Inventors: 长友翔希; 桥本达也; 桂川邦彦
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2019-05-20
Filing date: 2020-03-09
Publication date: 2021-12-14
Anticipated expiration: 2040-03-09
Also published as: WO2020235179A1; JP7458714B2; JP2020188874A; CN113795228B; BR112021023183A2

Abstract

An absorbent article (1) includes an absorbent main body (10), an abdominal-side belt member (20), and a back-side belt member (30), one of the abdominal-side belt member (20) and the back-side belt member (30) including a first sheet (21) and a second sheet (22), the other including a third sheet (31) and a fourth sheet (32), the sheets (21, 22, 31, 32) being joined at both left-right-direction end portions (20e, 30e) of the abdominal-side and back-side belt members (20, 30), respectively. In a state where the abdominal-side and back-side band members (20, 30) are elongated, the first sheet (21) has a non-skin-side portion (21e) and a folded-back portion (21f) folded back to the skin side, the non-skin-side portion (21e) is arranged closer to the non-skin side than the second sheet (22), and the third sheet (31) is arranged closer to the non-skin side than the fourth sheet and is not folded back.

Description

Absorbent article and method for manufacturing absorbent article

Technical Field

The present invention relates to an absorbent article and a method for manufacturing the absorbent article.

Background

As the absorbent article, a pull-up diaper can be exemplified. Patent document 1 discloses a pants-type absorbent article having a folded-back portion in which sheet members constituting a front-side exterior body and a back-side exterior body are folded back toward an inner surface side of the absorbent article along a peripheral edge end of a waist opening.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2013-116196

Disclosure of Invention

Problems to be solved by the invention

In the pants-type absorbent article described in patent document 1, since both the abdominal-side outer body and the back-side outer body of the waist opening are formed by folding back the material, there is a problem that the material cost increases by the amount corresponding to the folding back.

The present invention has been made in view of the conventional problems such as described above, and an object of the present invention is to provide an absorbent article capable of reducing the cost while maintaining the beauty of the end portion of the waistline opening portion.

Means for solving the problems

A principal aspect of the present invention for achieving the above object is an absorbent article having an up-down direction, a left-right direction, and a front-back direction intersecting with each other, the absorbent article comprising: an absorbent main body that absorbs liquid; a ventral belt member which is provided extending in the left-right direction and joined to a front upper end portion of the absorbent main body; and a back-side belt member that is provided so as to extend in the left-right direction and joined to a rear upper end portion of the absorbent main body, one of the abdominal-side belt member and the back-side belt member having a first sheet and a second sheet, the other of the abdominal-side belt member and the back-side belt member having a third sheet and a fourth sheet, the first sheet, the second sheet, the third sheet, and the fourth sheet being joined at both left-right direction end portions of the abdominal-side belt member and both left-right direction end portions of the back-side belt member, the first sheet having a non-skin-side portion arranged on the non-skin side with respect to the second sheet and a folded-back portion folded back toward the skin side at an upper end of the one belt member in an extended state of the abdominal-side belt member and the back-side belt member, the third sheet is disposed on the non-skin side with respect to the fourth sheet, and the third sheet is not folded back.

Further, a method of manufacturing an absorbent article having a vertical direction, a horizontal direction, and a front-rear direction intersecting with each other, the absorbent article including an absorbent main body, an abdominal-side belt member, and a back-side belt member, the absorbent main body absorbing liquid; the abdominal-side belt member is provided extending in the left-right direction and joined to a front-side upper end portion of the absorbent main body; the back-side belt member is provided as a separate member from the abdomen-side belt member extending in the left-right direction and joined to a rear-side upper end portion of the absorbent main body, the method including: a bonding step of bonding a non-skin-side continuous sheet and a skin-side continuous sheet, the non-skin-side continuous sheet being continuous in a conveyance direction, the non-skin side continuous sheet is to be a non-skin side sheet of the abdominal-side belt member and the back-side belt member, the skin-side continuous sheet is continuous in the conveying direction, the skin-side continuous sheet is to be a skin-side sheet of the abdominal-side belt member and the back-side belt member, the length of the skin-side continuous sheet in the CD direction is shorter than the length of the non-skin-side continuous sheet in the CD direction, the CD direction is a direction intersecting the conveying direction, the attaching step is performed such that, a CD-direction distance between one end of the non-skin side continuous sheet and one end of the skin side continuous sheet is shorter than a CD-direction distance between the other end of the non-skin side continuous sheet and the other end of the skin side continuous sheet; a folding back step of folding back the other end in the CD direction of the non-skin side continuous sheet toward a side that becomes a skin side of the absorbent article, the folding back step being performed without folding back the one end in the CD direction of the non-skin side continuous sheet; a forming step of forming a belly-side belt-like continuous sheet and a back-side belt-like continuous sheet, the forming step being performed by cutting the non-skin-side continuous sheet and the skin-side continuous sheet bonded together at a central portion in the CD direction of the non-skin-side continuous sheet and the skin-side continuous sheet; and a joining step of joining the front-side upper end portion of the absorbent main body and the ventral-side belt-like continuous sheet, and joining the rear-side upper end portion of the absorbent main body and the back-side belt-like continuous sheet.

Features of the present invention other than those described above will become apparent by reading the description of the present specification with reference to the accompanying drawings.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, an absorbent article can be provided that can be reduced in cost while maintaining the aesthetic appearance of the end portions of the waistline opening.

Drawings

Fig. 1 is a schematic perspective view of a pants-type disposable diaper 1 according to a first embodiment.

Fig. 2 is a schematic plan view of the diaper 1 according to the first embodiment in an unfolded and extended state as seen from the skin side.

Fig. 3 is a schematic sectional view taken along line a-a in fig. 2.

Fig. 4 is a schematic enlarged view of the back-side band member 30 in fig. 3.

Fig. 5 is a schematic perspective view of a pants-type disposable diaper 1 according to a second embodiment.

Fig. 6 is a schematic sectional view taken along line B-B in fig. 5.

Fig. 7 is a schematic diagram showing a manufacturing flow of the pull-up type disposable diaper 1 according to the first embodiment.

Fig. 8 is a schematic sectional view illustrating steps S210 and S211 of the pull-up type disposable diaper 1 according to the second embodiment.

Fig. 9 is a schematic diagram showing a manufacturing flow of the pull-up type disposable diaper 1 according to the second embodiment.

Detailed Description

The description of the specification and the drawings will clarify at least the following matters.

An absorbent article having an up-down direction, a left-right direction, and a front-back direction that intersect with each other, the absorbent article comprising: an absorbent main body that absorbs liquid; a ventral belt member which is provided extending in the left-right direction and joined to a front upper end portion of the absorbent main body; and a back-side belt member that is provided so as to extend in the left-right direction and joined to a rear upper end portion of the absorbent main body, one of the abdominal-side belt member and the back-side belt member having a first sheet and a second sheet, the other of the abdominal-side belt member and the back-side belt member having a third sheet and a fourth sheet, the first sheet, the second sheet, the third sheet, and the fourth sheet being joined at both left-right direction end portions of the abdominal-side belt member and both left-right direction end portions of the back-side belt member, the first sheet having a non-skin-side portion arranged on the non-skin side with respect to the second sheet and a folded-back portion folded back toward the skin side at an upper end of the one belt member in an extended state of the abdominal-side belt member and the back-side belt member, the third sheet is disposed on the non-skin side with respect to the fourth sheet, and the third sheet is not folded back.

According to the absorbent article, since the abdominal-side belt member, which is one belt member of the waist portion, has the folded-back portion, the beauty of the absorbent article is maintained. Further, since the upper end of the other back-side belt member is not folded back, the amount of material for forming the waist portion can be reduced. As a result, the cost can be reduced.

In the absorbent article, it is desirable that an upper end position of the third sheet and an upper end position of the fourth sheet are offset in the up-down direction.

According to the absorbent article, since the upper end position of the sheet is shifted on the non-folding belt member side, the rigidity of the end portion is lowered, so that the uncomfortable feeling of the texture when the absorbent article is worn can be reduced.

In the absorbent article, it is desirable that the one belt member further has another sheet disposed to overlap the folded-back portion from the skin side.

According to the absorbent article, the strength is further enhanced due to the presence of the other material (another sheet), and the absorbent article is less likely to be damaged when the absorbent article is worn.

In the absorbent article, it is desirable that the average basis weight of the first sheet is equal to or greater than the average basis weight of the second sheet, and the average basis weight of the third sheet is equal to or greater than the average basis weight of the fourth sheet.

According to the absorbent article, since the first sheet and the third sheet disposed on the non-skin side have a high average basis weight, the absorbent article can maintain strength and is less likely to be torn when the absorbent article is worn. Due to the low stiffness, the second and fourth sheets having a low average basis weight have a good texture. Further, the second sheet and the fourth sheet have high air permeability and moisture permeability, so that the discharge of moisture in the absorbent article can be promoted.

In the absorbent article, it is desirable that the first sheet and the third sheet are provided with a plurality of openings and/or the second sheet and the fourth sheet are provided with a plurality of openings.

According to the absorbent article, breathability is further enhanced due to the presence of the openings.

In the absorbent article, it is desirable that the one belt member has a plurality of through holes provided to penetrate through the non-skin side portion of the first sheet and the second sheet, the folded-back portion is a through hole absent region where the plurality of through holes are absent, the folded-back portion overlaps with the plurality of through holes when viewed in the front-rear direction, and a plurality of elastic members each stretchable in the left-right direction are arranged side by side in the up-down direction and joined between the first sheet and the second sheet by an adhesive.

According to the absorbent article, breathability is enhanced by the through-holes, while the folded-back portions prevent the risk of adhesive oozing out from the through-holes. This makes it possible to reduce the wearer's discomfort caused by the bleeding of the adhesive while ensuring breathability.

In the absorbent article, it is desirable that the absorbent main body has an overlapping region, the overlapping region being a region where the absorbent main body overlaps with at least a part of the plurality of through holes when viewed in the front-rear direction, and a part of a skin side surface of the folded-back portion is joined to a non-skin side surface of the overlapping region by an adhesive.

According to the absorbent article, the through-holes enhance breathability. And the folded-back portion interposed between the through hole and the absorbent main body in the front-rear direction can prevent the adhesive from oozing toward the non-skin side when the absorbent main body is joined to the abdominal-side or back-side belt member. This can reduce the wearer's discomfort caused by the bleeding of the adhesive.

In the absorbent article, it is desirable that a plurality of elastic members are arranged side by side in the up-down direction and joined between the first sheet and the second sheet by an adhesive, the plurality of elastic members each being stretchable in the left-right direction, a plurality of elastic members are arranged side by side in the up-down direction and joined between the third sheet and the fourth sheet by an adhesive, the plurality of elastic members each being stretchable in the left-right direction, and in each of the abdominal-side belt member and the back-side belt member, an average basis weight of the adhesive applied to the lowermost elastic member is larger than an average basis weight of the adhesive applied to the uppermost elastic member.

According to the absorbent article, the lowermost elastic member of each of the abdominal-side belt member and the back-side belt member forms at least a part of the leg opening, and therefore the high average basis weight of the adhesive for the lowermost elastic member makes the engagement of the lowermost elastic member firm, making it difficult for the elastic member to be disengaged even when the legs of the wearer move.

In the absorbent article, it is desirable that in the one belt member, the upper end of the second sheet is positioned below an uppermost elastic member of the plurality of elastic members.

According to the absorbent article, in the one belt member having the folded-back portion, in a case where the second sheet is not arranged up to the upper end of the one belt member, the joining of the elastic member at the upper end may be completed between the non-skin side portion of the first sheet and the folded-back portion. Therefore, the amount of arrangement of the second sheet is reduced, so that the cost can be reduced.

In the absorbent article, it is desirable that in the one belt member, the upper end of the second sheet is positioned above an uppermost elastic member of the plurality of elastic members.

According to the absorbent article, since the second sheet exists up to the upper end in the one belt member having the folded-back portion, the strength of the upper end portion is enhanced, so that the absorbent article is less likely to be damaged when the absorbent article is worn.

In the absorbent article, it is desirable that, in the other belt member, when an uppermost elastic member of the plurality of elastic members is defined as a first elastic member, and when an elastic member positioned below the first elastic member is defined as a second elastic member, a distance from an upper end of the other belt member to the first elastic member is longer than a distance from a lower end of the first elastic member to an upper end of the second elastic member.

According to the absorbent article, in the case where the distance from the upper end of the other belt member to the first elastic member is shorter than the distance from the lower end of the first elastic member to the upper end of the second elastic member, the upper end edge is easily affected by the contraction of the first and second elastic members, and therefore there is a risk that the upper end edge contracts excessively. Since the distance from the upper end of the other belt member to the first elastic member is set longer than the distance from the lower end of the first elastic member to the upper end of the second elastic member, the upper end edge is less likely to be affected by the contraction of the elastic member. This makes it easier to neatly form the upper end edge of the belt member that is not folded back.

A method of manufacturing an absorbent article having a vertical direction, a horizontal direction, and a front-rear direction intersecting with each other, the absorbent article including an absorbent main body, an abdominal belt member, and a back belt member, the absorbent main body absorbing liquid; the abdominal-side belt member is provided extending in the left-right direction and joined to a front-side upper end portion of the absorbent main body; the back-side belt member is provided as a separate member from the abdomen-side belt member extending in the left-right direction and joined to a rear-side upper end portion of the absorbent main body, the method including: a bonding step of bonding a non-skin-side continuous sheet and a skin-side continuous sheet, the non-skin-side continuous sheet being continuous in a conveyance direction, the non-skin side continuous sheet is to be a non-skin side sheet of the abdominal-side belt member and the back-side belt member, the skin-side continuous sheet is continuous in the conveying direction, the skin-side continuous sheet is to be a skin-side sheet of the abdominal-side belt member and the back-side belt member, the length of the skin-side continuous sheet in the CD direction is shorter than the length of the non-skin-side continuous sheet in the CD direction, the CD direction is a direction intersecting the conveying direction, the attaching step is performed such that, a CD-direction distance between one end of the non-skin side continuous sheet and one end of the skin side continuous sheet is shorter than a CD-direction distance between the other end of the non-skin side continuous sheet and the other end of the skin side continuous sheet; a folding back step of folding back the other end in the CD direction of the non-skin side continuous sheet toward a side that becomes a skin side of the absorbent article, the folding back step being performed without folding back the one end in the CD direction of the non-skin side continuous sheet; a forming step of forming a belly-side belt-like continuous sheet and a back-side belt-like continuous sheet, the forming step being performed by cutting the non-skin-side continuous sheet and the skin-side continuous sheet bonded together at a central portion in the CD direction of the non-skin-side continuous sheet and the skin-side continuous sheet; and a joining step of joining the front-side upper end portion of the absorbent main body and the ventral-side belt-like continuous sheet, and joining the rear-side upper end portion of the absorbent main body and the back-side belt-like continuous sheet.

According to the manufacturing method, the absorbent article can be manufactured at a reduced cost while maintaining the beauty of the end portion of the waistline opening.

In the method of manufacturing the absorbent article, it is desirable that the method further includes an adjustment step of adjusting a CD-direction position of either one of the non-skin side continuous sheet and the skin side continuous sheet, the adjustment step being performed in such a manner that one end in the CD direction of the non-skin side continuous sheet is aligned with one end in the CD direction of the skin side continuous sheet.

According to the manufacturing method, the end portions of the one side upper end portion to be the waistline opening portion are aligned, and therefore, the beauty of the end portions can be ensured.

In the method of manufacturing the absorbent article, it is desirable that in the joining step, the absorbent main body is joined so as to partially cover the ends of the abdomen-side belt-like continuous sheet and the back-side belt-like continuous sheet on the side that has been cut.

According to the manufacturing method, since the cut side directly constitutes the lower end of the waist portion (i.e., a part of the leg opening portion), the sheet of the belt member is less likely to be offset at the lower end. Therefore, the leg opening portion can be provided with good appearance. In addition, since a step of changing the direction or the like so that the cut-side end portion is positioned to the upper end of the waist portion is not provided after the cutting, the cost of the manufacturing step can be reduced.

In the above method for manufacturing an absorbent article, it is desirable that the attaching step includes: a forming step of forming a non-skin-side hole in the non-skin-side continuous sheet by penetrating a pin through the non-skin-side continuous sheet, and a forming step of forming a skin-side hole in the skin-side continuous sheet by penetrating the pin through the skin-side continuous sheet in a state in which the pin penetrates the non-skin-side continuous sheet, and in the turning-back step, turning back the other end of the non-skin-side continuous sheet so that the non-skin-side continuous sheet covers the skin-side hole from the skin side.

According to the manufacturing method, the open hole can be formed simultaneously at the step of attaching the non-skin side continuous sheet and the skin side continuous sheet, so that the cost of the manufacturing step can be reduced.

In the method of manufacturing the absorbent article, it is desirable that the method further includes an application step before the folding back step, the application step being a step of applying an adhesive in an area on the skin-side surface of the skin-side continuous sheet where the skin-side aperture is not present, and in the folding back step, the other end of the non-skin-side continuous sheet is folded back so that the non-skin-side continuous sheet overlaps with the area where the adhesive is applied.

According to the manufacturing method, the non-skin side continuous sheet is folded back so as to overlap with the adhesive, and therefore the adhesive can be prevented from oozing toward the skin side. Therefore, since the bleeding of the adhesive is unlikely to occur, an absorbent article capable of reducing the wearer's uncomfortable feeling due to the bleeding can be manufactured.

In the first embodiment, the first embodiment is described below

Hereinafter, an embodiment using a pull-up type disposable diaper for infants as an example of the absorbent article according to the present invention will be described. However, the absorbent article according to the present invention is not limited thereto, and is also applicable to an adult-use disposable diaper, a pants-type sanitary napkin, a belt-type disposable diaper attached to a wearer by a hook tape, and the like.

< Structure of Pull-on type Disposable diaper 1>

Fig. 1 is a schematic perspective view of a pull-up type disposable diaper 1 (hereinafter referred to as "diaper") according to a first embodiment. Fig. 2 is a schematic plan view of the diaper 1 according to the first embodiment in an unfolded and extended state as seen from the skin side. Fig. 3 is a schematic sectional view taken along line a-a in fig. 2.

As shown in fig. 1, in the pants-type state before being put on, the diaper 1 has a "vertical direction", a "horizontal direction" orthogonal to the vertical direction, and a "front-rear direction" orthogonal to the vertical direction and the horizontal direction. Note that, with respect to the up-down direction, the upper side corresponds to the waistline side of the wearer, and the lower side corresponds to the crotch side of the wearer. Further, with respect to the front-rear direction, the front side corresponds to the abdominal side of the wearer, and the rear side corresponds to the back side of the wearer.

In the pant-type state of fig. 1, the diaper 1 comprises: an absorbent main body 10 that absorbs liquid; a ventral belt member 20 extending in the left-right direction; and a back-side band member 30 which is provided so as to extend in the left-right direction and is positioned on the rear side of the abdominal-side band member 20. The absorbent main body 10 is disposed as a crotch portion between the abdominal side belt member 20 and the back side belt member 30. The abdomen-side belt member 20 and the back-side belt member 30 together form a waistline opening BH on the upper side in the up-down direction, and the

belt members

20 and 30 also serve as a waistline portion 2 attached to the waistline of the wearer.

Further, the left and right direction

respective end portions

20e and 20e of the abdominal-side band member 20 and the corresponding left and right direction

respective end portions

30e and 30e of the back-side band member 30 are joined to each other by means of, for example, welding or the like. Therefore, the abdominal-side belt member 20 and the back-side belt member 30 form leg openings LH and LH on both sides in the left-right direction on the lower side, respectively, together with the absorbent body 1.

Here, the "developed state" refers to a state in which the diaper 1 in the pants-type state shown in fig. 1 is developed as follows on a plane: the abdominal-side belt member 20 and the back-side belt member 30 are separated by releasing the engagement of both sides in the left-right direction, and the diaper 1 is spread in the up-down direction. In addition, the "extended state" refers to a state in which the product (diaper 1) is extended without wrinkles, specifically, a state in which the product (diaper 1) is extended until the sizes of the constituent members (for example, the absorbent main body 10, the abdominal-side belt member 20, and the like) of the diaper 1 match or are close to the sizes of these members themselves.

In the developed state, the diaper 1 has a longitudinal direction, a left-right direction, and a thickness direction (in fig. 2, a direction penetrating through the paper surface) which are three directions orthogonal to each other. Note that the longitudinal direction is arranged in the above-described up-down direction. One side of the longitudinal direction corresponds to the ventral side (anterior side), and the other side corresponds to the dorsal side (posterior side). The longitudinal outer side corresponds to the upper side (waist opening BH side) in the vertical direction, and the longitudinal inner side corresponds to the lower side (crotch side) in the vertical direction.

In addition, as described above, the vertical direction and the up-down direction are directions similar to each other, and therefore, hereinafter, for convenience of explanation, even in such a developed state, the description may be made using the up-down direction instead of the vertical direction. On the other hand, the left-right direction has the same meaning as the left-right direction in the pants-type state described above. In addition, in the thickness direction, one side corresponds to a skin side in contact with the body of the wearer, and the other side corresponds to a non-skin side located on the opposite side of the skin side.

In the diaper 1 in the developed state in fig. 2, when the absorbent main body 10 is bridged between the abdominal-side belt member 20 and the back-side belt member 30 in the longitudinal direction, the front upper end portion 10ea of the absorbent main body 10 and the abdominal-side belt member 20 are joined and fixed, and the rear upper end portion 10eb of the absorbent main body 10 and the back-side belt member 30 are joined and fixed. Therefore, the outer shape of the absorbent main body 10 is substantially H-shaped in a plan view. Further, from this state, when the diaper 1 is folded once at the folded position, the folded position is a predetermined position C10 in the longitudinal direction of the absorbent main body 10 (a central position C10 in the longitudinal direction of the diaper 1). Meanwhile, the left and right

direction end portions

20e and 30e of the abdominal-side band member 20 and the back-side band member 30 are engaged with each other as described above. This forms the pull-up pant diaper 1 shown in fig. 1.

As an example of the absorber 10, there may be provided an absorber including: an absorbent body 11; a liquid-permeable topsheet (not shown) disposed on the skin side with respect to the absorbent body 11; and a liquid-impermeable back sheet (not shown) arranged on the non-skin side with respect to the absorbent body 11. The absorbent body 11 absorbs and retains excrement such as urine, and is, for example, an article made by molding liquid absorbent fibers (e.g., pulp) containing superabsorbent polymer (SAP) into a predetermined shape.

< construction of the abdominal-side band member 20 and the back-side band member 30 >

The abdominal-side band member 20 and the back-side band member 30 are each formed of two sheet members of nonwoven fabric or the like. Here, the sheet member constituting any one of the abdominal-side band member 20 and the back-side band member 30 is defined as a first sheet and a second sheet. Also, the sheet member constituting the other of the abdominal-side band member 20 and the back-side band member 30 is defined as a third sheet and a fourth sheet. In the present embodiment, in fig. 3, a case is shown in which the abdominal-side belt member 20 (so-called one belt member) includes the first sheet 21 and the second sheet 22, and the back-side belt member 30 (so-called the other belt member) includes the third sheet 31 and the fourth sheet 32 disposed on the skin side of the wearer with respect to the third sheet 31.

The abdominal-side band member 20 has a plurality of elastic members 23 that expand and contract in the left-right direction, and the back-side band member 30 has a plurality of elastic members 33 that expand and contract in the left-right direction. The first sheet 21, the second sheet 22, the third sheet 31, and the fourth sheet 32 are disposed on the non-skin side with respect to the absorbent main body 10. In addition, as shown in fig. 2, the first sheet 21 and the second sheet 22 are joined in both left and right direction end portions 20e of the abdominal-side band member 20 by means of, for example, welding, and the third sheet 31 and the fourth sheet 32 are joined in both left and right direction end portions 30e of the back-side band member 30 by means of, for example, welding.

Conventionally, in a waistline opening portion of an absorbent article such as a diaper 1, the abdomen side and the back side of the waistline opening portion are formed at the upper end of the waistline opening portion in many cases by folding back a material toward the inner surface side of the absorbent article. However, this causes a problem that the material cost increases the amount of the folded portion.

In this regard, as shown in fig. 3, in the waistline portion 2 of the present invention, in the extended state in which the abdominal-side and back-side band members (20, 30) are extended, the first sheet 21 of the abdominal-side band member 20 has a non-skin side portion 21e arranged on the non-skin side with respect to the second sheet 22 and a folded-back portion 21f folded back toward the skin side at the upper end 20en of the abdominal-side band member 20. However, the third sheet 31 of the back-side belt member 30 is disposed on the non-skin side with respect to the fourth sheet 32 and does not turn back. The side close to the abdominal-side belt member 20, which is one belt member of the waist portion 2, has the folded-back portion 21f as described above, and therefore the beauty of the diaper 1 is maintained. Further, since the upper end of the other back-side band member 30 is not folded back, the amount of material for forming the waist portion 2 can be reduced. As a result, the cost can be reduced.

Then, in the case where the folded-back portion 21f is provided on the abdominal-side belt member 20 side as described above, the strength of the abdominal-side belt member 20 can be maintained, and the abdominal-side belt member 20 may be subjected to a force for lifting up the diaper 1 when the diaper 1 is put on a lying user. In addition, in the lying down state, the urination position of the diaper 1 is likely to be placed to the rear side, but the back-side belt member 30 is not folded back so that the air permeability is more easily maintained. In contrast, in the case where the back-side band member 30 side is provided with a folded-back portion (not shown), the folded-back portion makes it possible to maintain the strength of the back-side band member 30 even when the back-side band member 30 is gripped and lifted when putting the diaper on a standing user. In addition, in the standing state, the urination position is formed on the front side, and therefore the abdominal-side belt member 20 is not folded back so that breathability is more easily ensured.

Further, the length of the folded portion 21f in the up-down direction is preferably 25mm or more. By providing the folded-back portion 21f having a length of 25mm or more in the vertical direction, even when the position of the upper end portion of the second sheet 22 is slightly shifted, the folded-back portion 21f can be folded back toward the skin side so as to cover the upper end of the second sheet 22, and the aesthetic appearance of the folded-back portion 21f can be maintained.

As shown in fig. 3, the upper end position 31en of the third sheet 31 and the upper end position 32en of the fourth sheet 32 of the back-side belt member 30 of the present embodiment are aligned in the vertical direction. However, the upper end positions 31en and 32en may be offset in the up-down direction. Offsetting the upper end positions 31en of the third sheet and the upper end positions 32en of the fourth sheet from each other on the non-folded back side belt member 30 side reduces the rigidity of the upper end portion of the back side belt member 30, so that it is possible to reduce the feeling of discomfort in texture when the user puts on the diaper 1.

In addition, the abdominal-side band member 20 as one band member further includes another sheet 24 (see fig. 2 and 3), the another sheet 24 being disposed such that the another sheet 24 overlaps the folded-back portion 21f from the skin side. The other sheet 24 is formed of nonwoven fabric or the like, has a shorter vertical length than the first sheet 21, and covers the longitudinal ends of the absorbent main body 10. The presence of the other sheet material 24 increases the strength of the abdominal-side belt member 20, and therefore the diaper 1 is less likely to be damaged when the diaper 1 is lifted.

Note that it is preferable that the first sheet 21, the second sheet 22, the third sheet 31, and the fourth sheet 32 each have thermoplastic resin fibers. For example, these sheets are composed of single fibers made of thermoplastic resin such as polypropylene (PP) or Polyethylene (PE), or composite fibers such as a sheath-core structure of PP and PE.

Further, it is preferable that the average basis weight of the first sheet 21 is equal to or greater than the average basis weight of the second sheet 22, and the average basis weight of the third sheet 31 is equal to or greater than the average basis weight of the fourth sheet 32. Here, as for the average basis weight, an average of results obtained by measuring the basis weight (weight per unit area) at a plurality of positions (for example, ten positions) of each of the

sheets

21, 22, 31, and 33 is used as the average basis weight of each sheet. In the present embodiment, the magnitude relationship among the basis weights of the first sheet 21, the second sheet 22, the third sheet 31, and the fourth sheet 32 may be determined. And thus do not need to obtain strict values. Even when there is a slight error in the measured value, the value is acceptable.

The first sheet 21 having a high average basis weight has a non-skin side portion 21e, and the third sheet 31 also having a high average basis weight is a sheet arranged on the non-skin side with respect to the fourth sheet 32. As described above, since the first sheet 21 and the third sheet 31 each have a portion disposed on the non-skin side and their average basis weight is high, the strength of the waist portion 2 can be maintained, and the diaper is less likely to be torn when the diaper 1 is lifted up. Further, since the second sheet 22 and the fourth sheet 32, which are disposed on the skin side and have a low average basis weight, have low rigidity, the texture is enhanced. In addition, the second sheet 22 and the fourth sheet 32 having a low average basis weight have high air permeability and moisture permeability, so that the discharge of moisture in the diaper 1 can be promoted more easily.

The plurality of elastic members 23 are arranged in parallel in the vertical direction between the first sheet 21 and the second sheet 22. The plurality of elastic members 33 are arranged in parallel in the vertical direction between the third sheet 31 and the fourth sheet 32. In the state of being elongated in the left-right direction, the

elastic members

23 and 33 are joined with an adhesive such as a hot melt adhesive. In this way, stretchability is imparted to the abdominal-side band member 20 and the back-side band member 30. Note that as the

elastic members

23 and 33, linear rubber, spandex, or the like can be exemplified.

Further, it is desirable that when the adhesive is applied to join each of the

elastic members

23 and 33, in each of the abdominal-side belt member 20 and the back-side belt member 30, the average basis weight of the adhesive applied to the lowermost elastic member 23n (33n) (fig. 2) is set to be larger than the average basis weight of the adhesive applied to the uppermost elastic member 23a (33a) (fig. 2), the setting being achieved by adjusting the amount of the adhesive applied to each elastic member during the manufacture of the diaper 1 or the like. Note that the elastic member 23n (33n) is cut at the left-right direction center portion by making a slit or the like in the abdominal-side band member 20 (the back-side band member 30), and therefore the cut portion is not included in the elastic member 23n (33n) to which the adhesive is applied. In addition, the lowermost elastic members 23n and 33n in the abdominal-side belt member 20 and the back-side belt member 30 form at least a part of the leg opening LH, and therefore an increase in the average basis weight of the adhesive for the lowermost elastic members 22n and 33n firmly joins the lowermost elastic members 23n and 33 n. Therefore, even when the legs of the wearer move, the elastic members 23n and 33n are not easily disengaged.

In addition, as shown in fig. 3, in the abdominal-side belt member 20 having the folded-back portion 21f, the upper end 22en of the second sheet 22 is positioned below the uppermost elastic member 23a among the plurality of elastic members 23. At the upper end 20en of the abdominal-side belt member 20 having the folded-back portion 21f, the elastic member 23 can be engaged between the non-skin-side portion 21e of the first sheet 21 and the folded-back portion 21 f. Therefore, the second sheet 22 does not have to be arranged up to the upper end 20en of the abdominal-side band member 20 as described above. It should be noted that the second sheet 22 may be disposed in such a manner that the upper end 22en is positioned below the lower end of the folded portion 21 f. Therefore, the amount of material used for the second sheet 22 can be reduced, and the cost can be reduced.

Further, as described above, the second sheet 22 of the present embodiment is not arranged up to the upper end 20en of the abdominal-side band member 20, but the upper end 22en of the second sheet 22 may be positioned above the uppermost elastic member 23a of the plurality of elastic members 23. The presence of the second sheet 22 up to the upper end 20en in the abdominal-side belt member 20 provided with the folded-back portion 21f enhances the strength of the upper end portion of the abdominal-side belt member 22, so that the diaper 1 is less likely to be damaged when the diaper 1 is lifted up.

Fig. 4 is a schematic enlarged view of the back-side strap member 30 side in fig. 3. As shown in fig. 4, in the back-side band member 30, when the uppermost elastic member of the plurality of elastic members 33 is defined as a first elastic member 33a and the elastic member positioned below the first elastic member 33a is defined as a second elastic member 33b, a distance L1 from the upper end 30en of the back-side band member 30 to the first elastic member 33a is longer than a distance L2 from the lower end of the first elastic member 33a to the upper end of the second elastic member 33b (L1> L2). In the case where the distance L1 is shorter than the distance L2, the upper end is easily affected by the left-right direction contraction of the first and second

elastic members

33a and 33b, and there is a risk that the upper end 30en is excessively contracted. By setting the distance L1 to be longer than the distance L2, the upper end is less likely to be affected by the contraction of the first and second

elastic members

33a and 33 b. This makes it easier to neatly form the upper end 30en of the back-side band member 30 having no folded-back portion.

In the second embodiment, the first embodiment is described as follows

Fig. 5 is a schematic perspective view of a pull-up type disposable diaper 1 according to a second embodiment, and fig. 6 is a schematic sectional view taken along line B-B in fig. 5.

In the second embodiment, as shown in fig. 5, an opening 40 is provided in a part of the waistline portion 2. Mainly in this respect, the second embodiment is different from the first embodiment, and the other configurations are substantially the same. Therefore, the differences will be mainly described below, the same configurations as those of the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

In the second embodiment, as shown in fig. 5 and 6, the abdominal-side band member 20 (one band member) has a plurality of through-holes 40, and the through-holes 40 are provided such that the through-holes 40 penetrate the non-skin-side portion 21e of the first sheet 21 and the second sheet 22. The entire region of the folded portion 21f of the first sheet 21 is a through-hole absent region where the plurality of through holes 40 (openings 40) are absent. In addition, the folded-back portions 21f overlap the plurality of through holes 40 when viewed in the front-rear direction. In addition, in a region where the plurality of through holes 40 are present in the abdominal-side band member 20, a plurality of elastic members 23 that expand and contract in the left-right direction are arranged side by side in the up-down direction and are joined between the first sheet 21 and the second sheet 22 by an adhesive (not shown). The elastic member 23 is disposed at a position not overlapping the through-hole 40. As described above, the folded-back portion 21f prevents the adhesive for joining the elastic member 23 from oozing out from the through hole 40 toward the skin side while enhancing the air permeability of the abdominal-side band member 20 by providing the through hole 40. This makes it possible to reduce the wearer's discomfort caused by the bleeding of the adhesive while enhancing the breathability of the diaper 1.

Further, as shown in fig. 6, the absorbent main body 10 also has an overlapping region 10a where the absorbent main body 10 overlaps with at least a part of the plurality of through holes 40 when viewed in the front-rear direction (thickness direction). The skin side 21fh of the folded-back portion 21f of the first sheet 21 is joined to the non-skin side 10ah of the overlapping region 10a by the adhesive 50. The folded-back portion 21f is interposed between the through-hole 40 and the absorbent main body 10 in the front-rear direction (thickness direction) as described above, which can prevent the adhesive 50 from oozing out from the skin side to the non-skin side through the through-hole 40 when joining the absorbent main body 10 and the abdominal-side belt member 20 having the folded-back portion 21 f. This can reduce discomfort to the wearer due to adhesive bleed out.

< method for producing diaper 1 according to first embodiment >

Fig. 7 is a schematic diagram showing a manufacturing flow of the pull-up type disposable diaper 1 according to the first embodiment. The manufacturing process shown in fig. 7 mainly includes: a bonding step S201 of bonding the continuous sheets together, an application step S202 of applying an adhesive, a folding-back step S203 of folding back the continuous sheets, a forming step S204 of forming the belt-shaped continuous sheets on the ventral and back sides, and a joining step S205 of joining the absorbent main body 10. In a step further downstream of the joining step S205, portions corresponding to the

respective end portions

20e and 30e of the waistline portion 2 in the left-right direction are joined, and are cut into product units of the diapers 1 in the conveyance direction and subjected to other processes, forming the diapers 1 in a product state.

In the following description, the conveyance direction in which the non-skin side continuous sheet 21a and the skin side continuous sheet 22a are conveyed is also referred to as "MD direction", and the direction intersecting the MD direction is referred to as "CD direction". The MD direction corresponds to the left-right direction of the diaper 1 in the product state (fig. 1). In this example, the CD direction is in the horizontal direction. In addition, the CD direction is parallel to the width direction of the non-skin side continuous sheet 21a and the skin side continuous sheet 22 a. It should be noted that the following three directions are mutually orthogonal: the thickness direction of the non-skin side continuous sheet 21a and the skin side continuous sheet 22a (the direction penetrating the paper surface in fig. 7); an MD direction as a conveyance direction; and the CD direction as the width direction.

First, in the application step S201 of applying the continuous sheet, the material of the diaper 1 is conveyed by an appropriate conveying mechanism along a predetermined conveying direction (MD direction) at a predetermined conveying speed, and each material is arranged at a predetermined position. "materials of the diaper 1" means the non-skin side continuous sheet 21a, the skin side continuous sheet 22a, and the elastic members 23 'and 33'. The non-skin-side continuous sheet 21a is composed of a plurality of non-skin-side sheets (corresponding to the first sheet 21 and the third sheet 31 described above) of the abdominal-side belt member 20 and the back-side belt member 30, which are continuously connected in the left-right direction (conveying direction). The skin-side continuous sheet 22a is constituted by a plurality of skin-side sheets (corresponding to the above-described second sheet 22 and fourth sheet 32) of the abdominal-side belt member 20 and the back-side belt member 20, which are continuously connected in the left-right direction (conveying direction). The elastic member 23'(33') is constituted by a plurality of elastic members 23(33) continuously connected in the left-right direction. Note that the length of the skin-side continuous sheet 22a in the CD direction is shorter than the length of the non-skin-side continuous sheet 21a in the CD direction. As shown in fig. 7, the plurality of elastic members 23 'and 33' are conveyed in a state elongated in the conveying direction, and are placed to predetermined positions from above in the thickness direction of the non-skin side continuous sheet 21 a. The skin-side continuous sheet 22a is arranged from above the elastic members 23 'and 33'. An adhesive such as a hot melt adhesive is applied to the elastic members 23 'and 33', and the non-skin side continuous sheet 21a, the elastic members 23 'and 33', and the skin side continuous sheet 22a are adhered to each other.

In addition, in the bonding step S201, the following adjustment step (S201') is provided: the positions of the non-skin side continuous sheet 21a and the skin side continuous sheet 22a in the CD direction are adjusted in such a manner that one end 21an of the non-skin side continuous sheet 21a in the CD direction is aligned with one end 22an of the skin side continuous sheet 22a in the CD direction. In this step, only on one end side in the CD direction (the side close to one end 21an of the non-skin side continuous sheet 21a and one end 22an of the skin side continuous sheet 22 a), a sensor (not shown) that detects the positions of the one end 21an and the one end 22an is provided. Thereby, the positions of the one ends 21an and 22an are detected, and the arrangement positions are adjusted so as to align the positions in the CD direction of the one end sides of the non-skin side continuous sheet 21a and the skin side continuous sheet 22 a. The one end 21an and the one end 22an are portions to be upper ends of either the abdominal-side belt member or the back-side belt member forming the waist portion 2 of the diaper 1 in a product state. According to the adjusting step S201', the ends to be the upper ends are aligned, thereby securing the beauty of the upper ends.

In addition, in the attaching step S201, regardless of whether the above-described step S201' of adjusting the CD direction position of the one end side is provided, there is a risk of slight deviation in the arrangement between the

continuous sheets

21a and 22 a. In contrast, the non-skin side continuous sheet 21a and the skin side continuous sheet 22a are arranged as follows. That is, with respect to the one end 21an and the other end 21as in the CD direction of the non-skin side continuous sheet 21a and the one end 22an and the other end 22as in the CD direction of the skin side continuous sheet 22a, the non-skin side continuous sheet 21a and the skin side continuous sheet 22a are arranged and attached to each other in such a manner that the distance between the one end 21an and the one end 22an (in the example of the present manufacturing method, since the one end 21an and the one end 22an are aligned, the distance is substantially zero) is shorter than the distance between the other end 21as and the other end 22as (S1 in fig. 7).

The non-skin side continuous sheet 21a and the skin side continuous sheet 22a after the attachment are further conveyed in the conveying direction, and then, in the adhesive application step S202, the adhesive 45 is applied to a predetermined position of the skin side surface (upper side surface in the thickness direction) of the skin side continuous sheet 22 a.

In the next folding-back step S203, in a state where the one end 21an in the CD direction of the non-skin side continuous sheet 21a is not folded back, the other end 21as in the CD direction of the non-skin side continuous sheet 21a is folded back toward the side of the skin side surface (i.e., the side to be the skin side of the diaper 1 in the product state) so as to overlap with the area where the adhesive 45 is applied. Note that, in the belt-shaped folded portion 21fa which is continuous in the conveying direction and is to be the folded portion 21f of the first sheet 21 described above, the elastic member 23' is not arranged at the time of the attaching step S201. Since the elastic member 23' is not present in the belt-shaped turn-back portion 21fa, the belt-shaped turn-back portion 21fa turns back toward the skin-side continuous sheet 22a without shrinking. Therefore, preventing the contraction of the end portion formed by the fold-back makes it possible to maintain the beauty.

Next, in the forming step S204 of forming the belly-side and back-side belt-like continuous sheets, the non-skin-side continuous sheet 21a and the skin-side continuous sheet 22a are cut together at the central portions in the CD direction of the non-skin-side continuous sheet 21a and the skin-side continuous sheet 22 a. Therefore, one end side in the CD direction is the back-side belt-like continuous sheet 30a, the other end side in the CD direction is the front-side belt-like continuous sheet 20a, and the front-side belt-like continuous sheet 20a and the back-side belt-like continuous sheet 30a are conveyed in the conveying direction in a state where the front-side belt-like continuous sheet 20a and the back-side belt-like continuous sheet 30a are arranged at predetermined intervals in the CD direction, respectively.

Next, in the joining step S205 of joining the absorbent main body 10, the front upper end portion 10ea of the absorbent main body 10 and the abdomen-side belt-like continuous sheet 20a are joined by an adhesive (the adhesive 50 in fig. 6), and likewise, the back upper end portion 10eb of the absorbent main body 10 and the back-side belt-like continuous sheet 30a are joined by an adhesive. In addition, in the joining step S205, the absorbent main body 10 is joined so as to partially cover the cut-side end 20ah of the abdomen-side belt-like continuous sheet 20a and the cut-side end 30ah of the back-side belt-like continuous sheet 30 a. By joining the absorbent main body 10 with the abdomen-side belt-like continuous sheet 20a (back-side belt-like continuous sheet 30a) in this way, the cut-side ends 20ah and 30ah constitute the lower end (part of the leg opening portion) of the waist portion 2, so that the sheets of the abdomen-side belt member 20 and the back-side belt member 30 (the first sheet 21 and the second sheet 22 and the third sheet 31 and the fourth sheet 32) are less likely to shift at the lower end. Therefore, the leg opening LH can be provided with a good appearance. Further, after the above cutting, a step of changing the direction in such a manner that the cut-side ends 20ah and 30ah are positioned to the upper end of the waistline portion 2, and the like are not provided, so that the cost of the manufacturing step can be reduced.

According to the manufacturing method having steps S201 to S205, the diaper 1 capable of achieving both the beauty of the waistline opening BH and the cost reduction can be manufactured.

< method for producing diaper 1 according to second embodiment >

Fig. 8 is a schematic cross-sectional view illustrating steps S210 and S211 of the pull-up type disposable diaper 1 according to the second embodiment. Fig. 9 is a schematic diagram showing a manufacturing flow of the diaper 1 according to the second embodiment. Steps S202 to S205 of the second embodiment are substantially the same as steps S202 to S205 of the first embodiment. In order to form the through-hole 40 (opening 40) in the second embodiment, a step of forming an opening (S210 or S211) is added in the bonding step S201. Further, the arrangement and conveying method of the non-skin side continuous sheet 21a and the skin side continuous sheet 22a in the above-described step are different.

As shown in fig. 8, in the fitting step S201 in the method of manufacturing the diaper 1 according to the second embodiment, an upstream roller 51, an intermediate roller 52, a downstream roller 53, and a pair of conveying rollers 54 are provided.

A plurality of pins 55 for forming the through holes 40 are provided on the outer peripheral surface of the intermediate roller 52. A plurality of recesses 56 for receiving the plurality of pins 55, respectively, are provided on the outer peripheral surfaces of the upstream roller 51 and the downstream roller 53. The plurality of pins 55 may be heated pins 55 or unheated pins 55.

First, the non-skin-side continuous sheet 21a is conveyed by the rotation of the upstream roller 51 in a state of being wound around the upstream roller 51. When the non-skin side continuous sheet 21a approaches the intermediate roller 52, the plurality of pins 55 of the intermediate roller 52 are inserted into the non-skin side continuous sheet 21a and penetrate the non-skin side continuous sheet 21 a. Then, a plurality of non-skin side apertures 40 are formed in the non-skin side continuous sheet 21a (S210). After that, the non-skin-side continuous sheet 21a is transferred from the upstream roller 51 to the intermediate roller 52, and is conveyed by the rotation of the intermediate roller 52 in a state where the pin 55 penetrates the sheet.

On the other hand, the skin-side continuous sheet 22a is conveyed by the rotation of the downstream roller 53 in a state of being wound around the downstream roller 53. In addition, the elongated continuous elastic members 23 'and 33' coated with the adhesive are fed toward a position where the intermediate roller 52 and the downstream roller 53 approach each other. It should be noted that the elastic members 23 'and 33' are passed between the pins 55.

At a position where the intermediate roller 52 and the downstream roller 53 approach each other, the elastic members 23 'and 33' are inserted between the skin-side continuous sheet 22a and the non-skin-side continuous sheet 21a while the continuous sheets are sandwiched between the outer peripheral surface (the surface other than the pins 55) of the intermediate roller 52 and the outer peripheral surface (the surface other than the recesses 56) of the downstream roller 53. Thus, the skin-side continuous sheet 22a and the non-skin-side continuous sheet 21a are joined by the adhesive applied to the elastic members 23 'and 33'.

At the same time, the plurality of pins 55 in the state of penetrating the non-skin side continuous sheet 21a are inserted toward the skin side continuous sheet 22a and penetrate the skin side continuous sheet 22 a. Therefore, a plurality of skin-side holes 40 (through-holes 40) are formed in the skin-side continuous sheet 22 a.

Thereafter, the rotation of the intermediate roller 52 pulls out the pin 55 from the skin-side continuous sheet 22a toward the non-skin-side continuous sheet 21 a. Thus, the non-skin side continuous sheet 21a and the skin side continuous sheet 22a having the through holes 40 (the open holes 40) are formed. The non-skin-side continuous sheet 21a and the skin-side continuous sheet 22a are conveyed to the downstream step S202 by the pair of conveying rollers 54.

According to the steps S210 and S211 of forming the open hole, the through-hole 40 can be simultaneously formed at the attaching step S201 of attaching the non-skin side continuous sheet 21a and the skin side continuous sheet 22a, so that the cost of the manufacturing step can be reduced.

In addition, as shown in fig. 9, in the step S202 of applying an adhesive in the method of manufacturing the diaper 1 of the second embodiment, the adhesive 45 is applied to the area on the skin-side surface (upper surface in the thickness direction) of the skin-side continuous sheet 22a where the skin-side hole 40 does not exist. In the folding back step S203, the other end 21as of the non-skin side continuous sheet 21a is folded back such that the non-skin side continuous sheet 21a overlaps the area where the adhesive 45 is applied and such that the non-skin side continuous sheet 21a covers the skin side aperture 40 from the skin side (from above in the thickness direction). Since the non-skin-side continuous sheet 21a is folded back so as to overlap the adhesive 45, the adhesive 45 is prevented from oozing out toward the skin side (from the open hole 40 toward the belt-shaped folded-back portion 21 fa). Since the bleeding of the adhesive 45 is unlikely to occur, the diaper 1 capable of reducing the wearer's uncomfortable feeling due to the bleeding can be manufactured.

In other embodiments, the invention is not limited to the specific embodiments described

Although the above embodiments of the present invention have been described, the above embodiments are intended to facilitate understanding of the present invention and are not intended to limit the explanation of the present invention. Further, the present invention may be modified or improved without departing from the spirit thereof, and in addition, it goes without saying that equivalents thereof are also included in the present invention.

In the second embodiment, the through-hole 40 is provided so as to penetrate the non-skin side portion 21e of the first sheet 21 and the second sheet 22. However, a plurality of apertures 40 may be provided in the first and

third sheets

21, 31 disposed on the non-skin side and/or the second and

fourth sheets

22, 32 disposed on the skin side. The presence of the plurality of openings 40 enhances breathability. In the case where such open pores 40 are provided on the skin side, moisture such as sweat or the like is easily transferred to the non-skin side. On the other hand, in the case where such open pores are provided on the non-skin side, evaporation of moisture such as sweat or the like is easily promoted.

In the second embodiment described above, the shape of the opening 40 is circular. However, the shape is not limited to the circular shape shown in the drawings, but may be an oval shape or various other shapes.

List of reference numerals

1: diaper (absorbent article), 2: waist portion, 10: an absorbent main body having a plurality of absorbent layers,

10 a: overlap region, 10 ah: non-skin side, 10 ea: the upper end part of the front side is provided with a groove,

10 eb: rear upper end, 11: absorber, 20: the abdominal-side band member is provided with a plurality of belt-shaped members,

20 a: ventral belt-like continuous sheet, 20 ah: terminal, 20 e: the end part of the connecting rod is provided with a connecting rod,

20 en: upper end, 21: first sheet, 21 a: the non-skin side continuous sheet of material,

21 an: one end, 21 as: the other end, 21 e: non-skin side portion, 21 f: the turn-back portion is formed by a folded-back portion,

21 fa: band-shaped folded portion, 21 fh: skin side, 22: a second sheet of material comprising a second layer of material,

22 a: skin-side continuous sheet, 22 an: one end, 22 as: the other end, 22 en: the upper end of the upper cover is provided with a cover,

23: elastic member, 23': elastic member, 23 a: elastic member, 23 n: an elastic member is provided on the outer surface of the body,

24: another sheet, 30: back-side strap member, 30 a: a back-side belt-like continuous sheet,

30 ah: end, 30 e: end, 30 en: the upper end of the upper cover is provided with a cover,

31: third sheet, 31 en: the position of the upper end of the bracket,

32: fourth sheet, 32 en: the position of the upper end of the bracket,

33: elastic member, 33': elastic member, 33 a: an elastic member (first elastic member),

33 b: elastic member (second elastic member), 33 n: an elastic member is provided on the outer surface of the body,

40: open hole (through hole, non-skin side open hole, skin side open hole), 45: adhesive, 50: adhesive agent

51: upstream-side roller, 52: intermediate roller, 53: downstream-side roller, 54: a conveying roller for conveying the conveying roller,

55: pin, 56: the concave part is provided with a concave part,

BH: waist opening, C10: a central position (predetermined position),

l1: distance, L2: distance, LH: leg opening, S1: distance between two adjacent plates

Claims

1. An absorbent article having a vertical direction, a horizontal direction and a front-back direction intersecting with each other,

the absorbent article includes:

an absorbent main body that absorbs liquid;

a ventral belt member which is provided extending in the left-right direction and joined to a front upper end portion of the absorbent main body; and

a back-side belt member provided extending in the left-right direction and joined to a rear-side upper end portion of the absorbent main body,

one of the abdominal and dorsal strap members has a first sheet and a second sheet,

the other of the ventral-side strap member and the dorsal-side strap member has a third sheet and a fourth sheet,

the first sheet, the second sheet, the third sheet, and the fourth sheet are joined at both ends in the left-right direction of the abdominal-side band member and both ends in the left-right direction of the back-side band member,

in an extended state in which the abdominal-side band member and the back-side band member are extended,

the first sheet has a non-skin side portion and a reentrant portion,

the non-skin side portion is disposed on a non-skin side with respect to the second sheet,

the fold-back portion folds back toward the skin side at an upper end of the one belt member,

the third sheet is disposed on the non-skin side with respect to the fourth sheet,

the third sheet is not folded back.

2. The absorbent article according to claim 1,

an upper end position of the third sheet is offset from an upper end position of the fourth sheet in the up-down direction.

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

the one tape member further has another sheet disposed to overlap the folded-back portion from the skin side.

4. The absorbent article according to any one of claims 1 to 3,

the average basis weight of the first sheet is equal to or greater than the average basis weight of the second sheet, and

the average basis weight of the third sheet is equal to or greater than the average basis weight of the fourth sheet.

5. The absorbent article according to any one of claims 1 to 4,

the first and third sheets are provided with a plurality of apertures and/or the second and fourth sheets are provided with a plurality of apertures.

6. The absorbent article according to any one of claims 1 to 5,

the one band member has a plurality of through-holes,

the plurality of through-holes are provided so as to penetrate the non-skin side portion of the first sheet and the second sheet,

the folded-back portion is a through-hole absent region where the plurality of through-holes are absent,

the folded-back portions overlap with the plurality of through holes when viewed in the front-rear direction, and

a plurality of elastic members arranged in parallel in the vertical direction and joined between the first sheet and the second sheet by an adhesive,

the plurality of elastic members each extend and contract in the left-right direction.

7. The absorbent article according to claim 6,

the absorbent main body has an overlapping area,

the overlapping region is a region where the absorbent main body overlaps with at least a part of the plurality of through-holes when viewed in the front-rear direction, and

a portion of a skin side of the reentrant portion is joined to a non-skin side of the overlap region by an adhesive.

8. The absorbent article according to any one of claims 1 to 7,

a plurality of elastic members arranged in parallel in the vertical direction and bonded between the first sheet and the second sheet with an adhesive,

the plurality of elastic members each extend and contract in the left-right direction,

a plurality of elastic members arranged in parallel in the vertical direction and joined between the third sheet and the fourth sheet with an adhesive,

the plurality of elastic members each extend and contract in the left-right direction, and

in each of the ventral strap member and the dorsal strap member,

the average basis weight of the adhesive applied to the lowermost elastic member is greater than the average basis weight of the adhesive applied to the uppermost elastic member.

9. The absorbent article of claim 8,

in the one band member,

an upper end of the second sheet is positioned below an uppermost elastic member of the plurality of elastic members.

10. The absorbent article of claim 8,

in the one band member,

an upper end of the second sheet is positioned above an uppermost elastic member of the plurality of elastic members.

11. The absorbent article of claim 8,

in the case of the other of the belt members,

when an uppermost elastic member of the plurality of elastic members is defined as a first elastic member, and

when an elastic member positioned under the first elastic member is defined as a second elastic member,

a distance from an upper end of the other strap member to the first elastic member is longer than a distance from a lower end of the first elastic member to an upper end of the second elastic member.

12. A method for manufacturing an absorbent article having a plurality of absorbent layers,

the absorbent article has a vertical direction, a horizontal direction and a front-back direction which are mutually crossed,

the absorbent article includes an absorbent main body, a ventral belt member and a dorsal belt member,

the absorbent body absorbs liquid;

the abdominal-side belt member is provided extending in the left-right direction and joined to a front-side upper end portion of the absorbent main body;

the back-side belt member is provided as a separate member from the abdomen-side belt member so as to extend in the left-right direction, and is joined to a rear-side upper end portion of the absorbent main body,

the method comprises the following steps:

a bonding step of bonding the non-skin-side continuous sheet and the skin-side continuous sheet,

the non-skin side continuous sheet is continuous in the conveying direction,

the non-skin side continuous sheet is to be a non-skin side sheet of the abdominal-side belt member and the back-side belt member,

the skin-side continuous sheet is continuous in the conveying direction,

the skin-side continuous sheet is to be a skin-side sheet of the abdominal-side belt member and the back-side belt member,

the length of the skin-side continuous sheet in the CD direction is shorter than the length of the non-skin-side continuous sheet in the CD direction,

the CD direction is a direction intersecting the transport direction,

the attaching step is performed such that,

the distance in the CD direction between one end of the non-skin-side continuous sheet and one end of the skin-side continuous sheet is shorter than that of the skin-side continuous sheet

A CD direction distance between the other end of the non-skin side continuous sheet and the other end of the skin side continuous sheet;

a folding back step of folding back the other end in the CD direction of the non-skin-side continuous sheet toward a side that becomes the skin side of the absorbent article,

performing the folding back step without folding back one end of the non-skin side continuous sheet in the CD direction;

a forming step of forming a belly-side belt-like continuous sheet and a back-side belt-like continuous sheet,

performing the forming step by cutting the non-skin side continuous sheet and the skin side continuous sheet bonded together at a CD-direction central portion of the non-skin side continuous sheet and the skin side continuous sheet; and

a bonding step of bonding the first and second substrates,

joining the front upper end portion of the absorbent main body and the ventral belt-like continuous sheet, and

joining the back-side upper end portion of the absorbent main body and the back-side belt-like continuous sheet.

13. The method of manufacturing an absorbent article according to claim 12,

the method further includes an adjusting step of adjusting a CD-direction position of either one of the non-skin side continuous sheet and the skin side continuous sheet,

the adjusting step is performed in such a manner that one end in the CD direction of the non-skin side continuous sheet is aligned with one end in the CD direction of the skin side continuous sheet.

14. The method of manufacturing an absorbent article according to claim 12 or 13,

in the step of the joining, it is preferable that,

the absorbent main body is joined so as to partially cover the ends of the ventral-side belt-like continuous sheet and the dorsal-side belt-like continuous sheet on the side that has been cut.

15. The method of manufacturing an absorbent article according to any one of claims 12 to 14,

the attaching step includes:

a forming step of forming a non-skin-side hole in the non-skin-side continuous sheet by penetrating a pin through the non-skin-side continuous sheet, and

a forming step of forming a skin-side hole in the skin-side continuous sheet by penetrating the pin through the skin-side continuous sheet in a state where the pin penetrates the non-skin-side continuous sheet, and

in the step of turning back,

the other end of the non-skin-side continuous sheet is folded back so that the non-skin-side continuous sheet covers the skin-side aperture from the skin side.

16. The method of manufacturing an absorbent article according to claim 15,

the method further comprises a coating step prior to the folding back step,

the coating step is a step of coating an adhesive in an area on the skin-side surface of the skin-side continuous sheet where the skin-side aperture is absent, and

in the step of turning back,

folding back the other end of the non-skin side continuous sheet so that the non-skin side continuous sheet overlaps with the area where the adhesive is applied.