CN112243369A - Absorbent article - Google Patents

Abstract

Provided is an absorbent article having better air permeability than conventional ones. The absorbent article includes a1 st contraction part which includes a1 st expansion member provided in a1 st region close to a trunk opening end edge forming a trunk opening through which a trunk portion of a wearer can be inserted out of a front trunk region and a rear trunk region and extending in a trunk direction, and contracts the trunk opening in the trunk direction, wherein a plurality of 1 st expansion members are arranged at a constant interval in the 1 st contraction part, and the interval between the 1 st expansion members is 6.5mm or more and 20mm or less.

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article.

Background

Absorbent articles such as disposable diapers, urine pads, and sanitary napkins include an absorbent body that absorbs excretory fluids such as urine and body fluids. As such an Absorbent, for example, pulp, Super Absorbent Polymer (SAP), or the like is used.

Further, when the absorbent article is worn, moisture generated from urine, body fluid, or the like absorbed in the absorbent body tends to accumulate in the internal space of the absorbent article (the space formed between the skin of the wearer and the skin contact surface of the absorbent article), and this moisture is not preferable because it causes skin problems such as skin inflammation and causes discomfort such as moist heat and stickiness.

In order to discharge moisture accumulated in the internal space of the absorbent article to the outside when the absorbent article is worn, various proposals have been made to improve the air permeability of the absorbent article (for example, see patent document 1). For example, a disposable diaper is known in which an outer sheet and an inner sheet are contracted in the circumferential direction of a waist by elastic members to form gathers at the waist circumference (japanese patent No. ウエスト - り) and moisture is discharged to the outside from gaps between the gathers and the skin of a wearer.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 5761179

Disclosure of Invention

Problems to be solved by the invention

As described above, various proposals have been made to improve the air permeability of absorbent articles, but it is actually desired to provide absorbent articles having higher air permeability. Accordingly, an object of the present invention is to provide an absorbent article having better air permeability than the conventional ones.

Means for solving the problems

In order to solve the above problems, an absorbent article of the present invention is an absorbent article in which a front torso region covering the abdomen of a wearer, a rear torso region covering the back of the wearer, and a crotch region located between the front torso region and the rear torso region and in which an absorber is disposed are continuously provided, and includes a1 st contraction part, the 1 st contracting portion includes a1 st contracting member provided in a1 st region of the front and rear trunk regions, the 1 st region being close to a trunk opening end edge forming a trunk opening through which a trunk of a wearer can be inserted, and extending in a trunk-surrounding direction, and contracts the trunk opening in the trunk-surrounding direction, the 1 st contracting portion is provided with a plurality of 1 st telescopic members at a constant interval, and the interval between the 1 st telescopic members is 6.5mm to 20 mm.

Here, the interval between the 1 st telescopic members may be 6.5mm to 13 mm.

Further, the 1 st constriction may be formed so as to extend from the open end edge of the trunk in a longitudinal direction connecting the front and rear main bodies to each other in a range of 26mm to 31 mm.

In addition, the 1 st constricted part may have a laminated structure in which at least 3 layers of sheet members are laminated.

Further, the medical treatment apparatus may further include a2 nd contraction portion which includes a2 nd expansion member provided in a2 nd region adjacent to the 1 st region on the crotch region side out of the front and rear large regions and extending in the trunk direction, and which contracts the trunk opening in the trunk direction, wherein a plurality of the 2 nd expansion members are arranged in the 2 nd contraction portion, and an interval between the 2 nd expansion members may be set to a size smaller than an interval between the 1 st expansion members.

ADVANTAGEOUS EFFECTS OF INVENTION

In the absorbent article, good air permeability can be obtained as compared with the conventional ones.

Drawings

Fig. 1 is a perspective view of an underpants type disposable diaper according to embodiment 1.

Fig. 2 is an exploded perspective view of the diaper of embodiment 1.

Fig. 3 is a view schematically showing a state where the diaper of embodiment 1 is unfolded.

Fig. 4 is a diagram illustrating an arrangement of air-passage forming sheets in the diaper of embodiment 1.

Fig. 5 is a view schematically showing a state where the diaper of the comparative example is unfolded.

Fig. 6 is a view illustrating the interval between the 1 st linear rubbers and the gathers formed in the 1 st contracted portion of the diaper of the comparative example.

Fig. 7A is a view illustrating a fold in the 1 st contracted portion of the waist gather according to embodiment 1.

Fig. 7B is a view illustrating the pleats in the 1 st contracted portion of the waist gather of the comparative example.

Fig. 8 is a diagram illustrating a wind speed measurement position in the air permeability quantitative test.

Fig. 9 is a diagram showing a fog penetration tester used in the fog penetration test.

Fig. 10A is an enlarged photograph of the pleats forming the waist gather of the example.

Fig. 10B is an enlarged photograph of the pleats forming the waist gather of the comparative example.

Fig. 11 is a view schematically showing a state where the diaper of embodiment 2 is unfolded.

Fig. 12 is a view schematically showing a state where the diaper of embodiment 3 is unfolded.

Fig. 13 is a perspective view of a pants-type disposable diaper according to embodiment 4.

Fig. 14 is an exploded perspective view of the diaper of embodiment 4.

Fig. 15 is a view schematically showing a state where the diaper of embodiment 4 is unfolded.

Fig. 16 is a diagram illustrating an arrangement of air-passage forming sheets in the diaper of embodiment 4.

Fig. 17 is a view showing a part of a joint portion joining the air passage-forming sheet.

Fig. 18 is a graph showing the magnitude of the contraction force in each contraction portion.

FIG. 19 is a view illustrating the pleats formed in the 2 nd contraction part of the waist gather and the 3 rd contraction part of the abdomen gather (Japanese: タミーギャザー).

Fig. 20 is a view schematically showing a state where the diaper of the modified example is unfolded.

Fig. 21 is a view illustrating the pleats formed in the 1 st and 2 nd constrictions of the waist gather and the 3 rd constriction of the abdomen gather.

Fig. 22 is a view showing the ventilation holes formed at the opening end edges of the trunk opening when the waist gather is contracted.

Detailed Description

Hereinafter, embodiments of the present invention will be described. The embodiments described below are examples of the embodiments of the present invention, and the technical scope of the present invention is not limited to the embodiments described below.

< embodiment 1>

Fig. 1 is a perspective view of a pants-type disposable diaper (hereinafter, simply referred to as "diaper") 1 according to embodiment 1. Fig. 2 is an exploded perspective view of the diaper 1 of the embodiment. Fig. 3 is a view schematically showing a state where the diaper 1 of embodiment 1 is unfolded. Fig. 3(a) schematically shows the internal configuration in the case where the diaper 1 when developed is viewed from the left side. Fig. 3 (B) schematically shows the planar configuration of the diaper 1 when unfolded.

The term "direction" used in the present specification means a direction that coincides with the front, back, left, and right of a wearer in a state where the diaper 1 is worn on the wearer. For example, the term "left-right direction" in the present specification means a direction that coincides with the left and right of a wearer in a state where the diaper 1 is worn on the wearer.

In the present specification, the "front bodice area" of the diaper 1 means a portion that covers the abdomen (front of the body) of the wearer when the diaper 1 is worn on the wearer. The "crotch region" of the diaper 1 means a portion that covers the crotch of the wearer when the diaper 1 is worn on the wearer. The "back bodice area" of the diaper 1 means a portion that covers the back (rear body) of a wearer when the diaper 1 is worn on the wearer. In the present specification, the "longitudinal direction" means a direction connecting the front and rear bodices of the diaper 1. That is, the longitudinal direction of the diaper 1 coincides with the direction in which the front, crotch, and rear bodices are continuously provided. The "width direction" means a direction orthogonal to the longitudinal direction of the diaper 1.

In the present embodiment, as an example of an absorbent article, a pants-type disposable diaper having a tubular structure with an opening into which the abdominal circumference of a wearer enters and a pair of left and right openings through which the left and right lower limbs of the wearer are inserted is exemplified, but the "absorbent article" in the present specification is not limited to a pants-type disposable diaper. The "absorbent article" includes various forms of absorbent articles such as a belt-type disposable diaper having a tubular structure formed by attaching a belt fixed to the vicinity of one end of a sheet-like member covering the crotch (private part) of a wearer from the front torso region to the rear torso region to the vicinity of the other end of the sheet-like member, and capable of wrapping the abdominal circumference and the crotch.

As shown in fig. 1 to 3, the diaper 1 has a crotch region 1B covering the crotch (pudendum) of a wearer in a worn state, a front torso region 1F covering the abdomen of the wearer, and a rear torso region 1R covering the back of the wearer. The crotch region 1B is located between the front and back body regions 1F and 1R and is provided continuously with the front and back body regions 1F and 1R, and the crotch region 1B is provided with an absorbent portion main body 15 (absorbent body 8) that absorbs and retains liquid.

The diaper 1 in the present embodiment is a pants-type disposable diaper, and is configured in a state shown in fig. 1 by joining the left side edge of the front torso region 1F and the left side edge of the rear torso region 1R to each other and joining the right side edge of the front torso region 1F and the right side edge of the rear torso region 1R to each other. As shown in fig. 1, a trunk opening (waist opening) 2T is formed by the upper end edge of the front torso region 1F and the upper end edge of the rear torso region 1R. In the diaper 1, a left lower limb opening 2L is formed in the left side portion of the crotch region 1B where the above-described joining is not performed, and a right lower limb opening 2R is formed in the right side portion of the crotch region 1B. The left lower limb opening 2L and the right lower limb opening 2R are openings for inserting the legs of the wearer when the diaper 1 is worn.

When the diaper 1 is worn such that the left lower limb of the wearer is inserted through the left lower limb opening 2L, the right lower limb of the wearer is inserted through the right lower limb opening 2R, and the torso of the wearer enters (passes through) the torso opening 2T, the diaper is fixed to the body of the wearer in a state where "the front torso region 1F contacts the abdomen of the wearer, the rear torso region 1R contacts the back side of the wearer, the crotch region 1B contacts the crotch portion (japanese: thigh portion) of the wearer, and the left lower limb opening 2L and the right lower limb opening 2R surround the thighs of the wearer". By fixing the diaper 1 to the body of the wearer in this manner, standing walking can be achieved in a state where the diaper 1 is worn.

In the diaper 1, the absorbent body 8 capable of absorbing and retaining liquid is disposed mainly around the crotch region 1B. In addition, in order to suppress formation of a gap which becomes an outflow path of liquid between diaper 1 and the skin of the wearer, diaper 1 is provided with three-dimensional gather G1L, three-dimensional gather G1R, and waist gather G2 at left lower limb opening 2L, right lower limb opening 2R, and trunk opening 2T, respectively. The three-dimensional gathers G1L, G1R and the waist gather G2 are configured to be in close contact with the skin of the wearer by the elastic force of the string-like rubber, and thereby the excretory fluid discharged from the wearer can be absorbed in the absorbent part main body 15 (absorber 8) without leaking from the diaper 1.

As shown in fig. 2 and 3, the diaper 1 includes cover sheets 4F and 4R forming an outer surface in a state of being worn on a wearer, and a pad cover sheet 6. The cover sheet 4F is a sheet member that mainly forms the outer surface of the front bodice area 1F of the diaper 1. The cushion cover sheet 6 is a sheet member mainly used for forming the outer surface of the crotch region 1B of the diaper 1. The cover sheet 4R is a sheet member for forming the outer surface of the back torso region 1R of the diaper 1.

The cover sheets 4F and 4R and the gasket sheet 6 are provided, for example, for reinforcement of the outer surface of the diaper 1 and improvement of the hand. The cover sheets 4F and 4R and the gasket sheet 6 may be formed of, for example, a nonwoven fabric made of a liquid-impermeable thermoplastic resin in order to suppress leakage of excrement. Examples of the liquid-impermeable thermoplastic resin include Polyethylene (PE), polypropylene (PP), and the like. In addition, many fine pores of about 0.1 to several μm may be formed in the liquid-impermeable sheet so as to exhibit liquid impermeability and moisture permeability.

The diaper 1 further includes an inner cover sheet 5F laminated on the skin-facing surface side of the cover sheet 4F and an inner cover sheet 5R laminated on the skin-facing surface side of the cover sheet 4R. In the present specification, the "skin-facing surface" means a surface that faces the skin of the wearer when the diaper 1 is worn by the wearer. As will be described in detail later, the inner cover sheet 5F is a sheet member that is bonded to the cover sheet 4F with a linear rubber as a linear stretchable member sandwiched between the sheet member and the cover sheet 4F. The inner cover piece 5F is a piece member having a shape and a size corresponding to the cover piece 4F except for a folded portion 4F5 and a lumbar region RW1 in the outer cover portion 4F10, which will be described later. The inner cover sheet 5R is a sheet member that is bonded to the cover sheet 4F with a linear rubber as a linear stretchable member sandwiched between the sheet member and the cover sheet 4R. The inner cover piece 5R is a sheet member having a shape and a size corresponding to the cover piece 4R except for a folded portion 4R5 and a lumbar region 1 RW1 in the outer cover portion 4R10, which will be described later.

The diaper 1 of the present embodiment includes an absorbent portion main body 15. The absorbent part main body 15 is held in a state of being laid between the front torso region 1F and the rear torso region 1R, is arranged in the crotch of the wearer when the diaper 1 is worn, and absorbs and holds liquid such as urine excreted by the wearer. As shown in fig. 2 and 3, the absorbent part main body 15 includes a cushion sheet 6, a back sheet 7, an absorbent body 8, a center sheet 9, side sheets 10L, 10R, and the like, and is integrally formed therewith.

The back sheet 7, the absorbent body 8, and the center sheet 9 are laminated in this order on the skin-facing surface of the mask sheet 6. The cushion sheet 6 is a sheet member having a rectangular plane having a length in the longitudinal direction from the front torso to the back torso of the wearer through the crotch, and a predetermined lateral width in the width direction perpendicular to the longitudinal direction. The back sheet 7, the absorbent body 8, and the center sheet 9 are sheet members each having a rectangular plane in the same manner as the pad cover sheet 6, and are stacked in this order with respect to the pad cover sheet 6, in the order of the back sheet 7, the absorbent body 8, and the center sheet 9, with the longitudinal direction thereof coinciding with the longitudinal direction of the pad cover sheet 6.

The absorbent body 8 is a member for absorbing liquid such as urine and holding the absorbed liquid. The absorber 8 is disposed between the liquid-impermeable back sheet 7 and the liquid-permeable center sheet 9. The absorbent body 8 may have a structure in which a particulate absorbent resin such as a hydrophilic super absorbent polymer having a crosslinked structure capable of absorbing and retaining water is retained in gaps between short fibers of cellulose-based fibers such as pulp fibers, rayon fibers, and cotton fibers, and short fibers obtained by hydrophilization treatment of synthetic fibers such as polyethylene, polypropylene, and polyethylene terephthalate. Thus, when the absorbent body 8 absorbs the liquid excreted from the wearer, the absorbent resin held in the gaps in the short fibers swells and the liquid can be held in the short fibers. The absorbent body 8 may have a single-layer structure composed of 1 sheet of mat, or may have a laminated structure in which a plurality of sheets of mats are stacked. The absorbent body 8 can have an appropriate shape according to the purpose. Examples of the shape of the absorbent body 8 include a rectangular shape, an hourglass shape in which the vicinity of the central portion is narrowed, and other various shapes.

The center sheet 9 is a sheet member for making direct contact with the skin of the wearer's crotch and transmitting liquid such as urine to the absorbent body 8, and is stacked so as to cover the water absorption surface of the absorbent body 8. The center sheet 9 in the present embodiment is formed of a liquid-permeable material having high flexibility. Examples of the liquid-permeable material forming the center sheet 9 include woven cloth, nonwoven cloth, and porous film. The center sheet 9 may have hydrophilicity.

The back sheet 7 is a sheet member for suppressing leakage of the liquid that has passed through the center sheet 9 and absorbed in the absorbent body 8 to the outside of the diaper 1. Thus, the back sheet 7 is formed of a liquid-impermeable material. As the liquid-impermeable material forming the back sheet 7, a liquid-impermeable film made of polyethylene resin or the like can be exemplified. In addition, the back sheet 7 may be formed of a microporous polyethylene film formed with many fine pores in order to secure breathability.

The gasket sheet 6 is a member for reinforcing the back sheet 7 and making the skin feel good, and is attached to the back sheet 7. Examples of the material for forming the gasket sheet 6 include woven fabric and nonwoven fabric. The mat cover sheet 6 may be a nonwoven fabric or wet nonwoven fabric made of a thermoplastic resin such as polyethylene, polypropylene, or polyester.

The side sheets 10L and 10R in the absorbent portion main body 15 are elongated belt-like members for forming the above-described three-dimensional gathers G1L and G1R. The side sheets 10L and 10R extend along the long side portion of the center sheet 9. Linear rubbers 10L1, 10R1 are bonded to the side sheets 10L, 10R along the longitudinal direction. When the diaper 1 shown in fig. 1 is configured by joining the left edge 4F7 of the cover sheet 4F forming the left edge of the front bodice region 1F and the left edge 4R7 of the cover sheet 4R forming the left edge of the rear bodice region 1R to each other and joining the right edge 4F8 of the cover sheet 4F forming the right edge of the front bodice region 1F and the right edge 4R8 of the cover sheet 4R forming the right edge of the rear bodice region 1R to each other, the side sheets 10L, 10R are pulled in the longitudinal direction by the contractive force of the linear rubbers 10L1, 10R1, and as a result, rise from the center sheet 9 along the fold lines 10L2, 10R 2.

Thus, three-dimensional gathers G1L, G1R are formed that prevent liquid from flowing out of left lower limb opening 2L and right lower limb opening 2R. The method of joining the side edges of the cover sheets 4F and 4R to each other is not particularly limited, but examples thereof include heat sealing, high-frequency sealing, and ultrasonic sealing. Further, the absorbent portion main body 15 extends from the front torso region 1F to the rear torso region 1R.

Next, the detailed structure of the diaper 1 will be described. As shown in fig. 3, the cover sheet 4F is folded inward at the top end side with a fold line 4F6 as a boundary to form a fold 4F 5. Hereinafter, the portion of the cover piece 4F other than the folded portion 4F5 is referred to as an outer cover portion 4F 10. The outer covering portion 4F10 of the cover piece 4F forms the outer surface of the diaper 1. The fold line 4F6 of the cover sheet 4F forms a trunk opening end edge 4F9 of the trunk opening 2T in the assembled state of the diaper 1.

The 1 st linear rubber 4F1 in an extended state is disposed between the folded portion 4F5 of the cover piece 4F and the outer cover portion 4F 10. The tip end side of the folded portion 4F5 of the cover sheet 4F is bonded so as to overlap one end of the absorbent body 8 in a state where the inner cover sheet 5F, the pad cover sheet 6, the back sheet 7, and one end of the absorbent body 8 in the longitudinal direction are sandwiched between the layers of the outer cover portion 4F 10. In the present specification, the manner in which one member and another member are overlapped is not limited to the manner in which the members are overlapped in a state of being in full-face contact with each other, and is a concept including a manner in which a part of one member and the other member are entirely overlapped, a manner in which a part of one member and another member are overlapped with each other, or the like.

As shown in fig. 3, the 2 nd linear rubber 4F2, the 3 rd linear rubber 4F3, and the 4 th linear rubber 4F4 are disposed in this order between the outer covering portion 4F10 of the cover piece 4F and the inner covering piece 5F from the side of the fold line 4F6, and bonded in a state of being sandwiched between the outer covering portion 4F10 and the inner covering piece 5F. As shown in fig. 3, the 1 st to4 th linear rubbers 4F1 to 4F4 in the cover sheet 4F are arranged in parallel with each other and extend in the width direction (trunk direction) of the cover sheet 4F.

On the other hand, the cover sheet 4R is also folded inward at the top end side with the fold line 4R6 as a boundary to form a fold portion 4R 5. Hereinafter, the portion of the cover piece 4R other than the folded portion 4R5 is referred to as an outer cover portion 4R 10. The outer covering portion 4R10 of the cover piece 4R forms the outer surface of the diaper 1. The fold line 4R6 of the cover sheet 4R forms a trunk opening end edge 4R9 of the trunk opening 2T in the assembled state of the diaper 1. The 1 st linear rubber 4R1 in an extended state is disposed between the folded portion 4R5 of the cover piece 4R and the outer cover portion 4R 10. The cover sheet 4R is bonded so that the tip end side of the folded-over portion 4R5 is sandwiched between the inner cover sheet 5R, the pad cover sheet 6, the back sheet 7, and the other end side of the absorbent body 8 in the longitudinal direction and the outer cover portion 4R10, and is overlapped with the other end side of the absorbent body 8.

As shown in fig. 3, the 2 nd linear rubber 4R2, the 3 rd linear rubber 4F3, and the 4 th linear rubber 4R4 are arranged in this order from the side of the folding line 4R6 between the outer covering portion 4R10 of the cover piece 4R and the inner cover piece 5R, and bonded in a state sandwiched by the outer covering portion 4R10 and the inner cover piece 5R. As shown in fig. 3, the 1 st to4 th linear rubbers 4R1 to4 th linear rubbers 4R4 in the cover piece 4R are arranged in parallel and extend in the width direction (trunk direction) of the cover piece 4R.

Hereinafter, the region of the cover sheets 4F and 4R of the diaper 1 where the 1 st linear rubbers 4F1 and 4R1 and the 2 nd linear rubbers 4F2 and 4R2 are disposed is referred to as a "waist region RW". The waist region RW of the diaper 1 is a region located in the vicinity of the trunk opening end edges 4F9, 4R9 forming the trunk opening 2T and forming the waist gather G2. In the waist region RW, the region where the 1 st linear rubbers 4F1 and 4R1 are disposed is referred to as "waist 1 st region RW 1" (1 st region), and the region where the 2 nd linear rubbers 4F2 and 4R2 are disposed is referred to as "waist 2 nd region RW 2" (2 nd region).

In addition, in the cover sheets 4F and 4R of the diaper 1, the region where the 3 rd linear rubbers 4F3 and 4R3 and the 4 th linear rubbers 4F4 and 4R4 are arranged is referred to as "abdominal region (japanese: region of タミー) RT". The abdominal region RT is a region located below the lumbar region RW. The region in which the 3 rd linear rubbers 4F3 and 4R3 are disposed in the abdomen region RT is referred to as "abdomen 1 region RT 1", and the region in which the 4 th linear rubbers 4F4 and 4R4 are disposed is referred to as "abdomen 2 region RT 2".

Here, the 1 st linear rubbers 4F1 and 4R1 in the waist 1 st region RW1 are applied with an adhesive in an extended state, for example, during assembly of the diaper 1, and then sandwiched between the outer covering portions 4F10 and 4R10 and the folded-over portions 4F5 and 4R5, thereby adhering the layers therebetween. Similarly, the 2 nd linear rubbers 4F2 and 4R2 in the waist region RW2 and the 3 rd linear rubbers 4F3 and 4R3 and the 4 th linear rubbers 4F4 and 4R4 in the abdomen region RT are applied with an adhesive in an extended state, for example, during the assembly of the diaper 1, and then sandwiched between the outer covering portions 4F10 and 4R10 of the covering sheets 4F and 4R and the inner covering sheets 5F and 5R to be bonded between the layers thereof.

Here, when the 1 st linear rubbers 4F1, 4R1 of the waist portion 1 region RW1 sandwiched and bonded in an extended state between the outer covering portions 4F10, 4R10 of the cover pieces 4F, 4R and the inner covering pieces 5F, 5R contract, the portions corresponding to the waist portion 1 region RW1 in the outer covering portions 4F10, 4R10 and the folded-over portions 4F5, 4R5 follow this contraction, and the 1 st contracted portion S1 that contracts the waist portion 1 region RW1 in the trunk direction is formed.

In the lumbar region 2 RW2, when the 2 nd linear rubbers 4F2 and 4R2 sandwiched and bonded in an extended state between the outer cover portions 4F10 and 4R10 and the inner cover pieces 5F and 5R contract, the portions of the outer cover portions 4F10 and 4R10 and the inner cover pieces 5F and 5R corresponding to the lumbar region 2 RW2 are continuously flexed in a pleated state following the contraction, thereby forming the 2 nd contracted portion S2 which contracts the lumbar region 2 RW2 in the trunk direction.

In the present embodiment, the waist gather G2 is formed mainly by the 1 st contracted portion S1 formed in the waist 1 st region RW1 and the 2 nd contracted portion S2 formed in the waist 2 nd region RW 2. The waist gather G2 improves the fit of the diaper 1 around the waist of the wearer by the contractive force of the 1 st linear rubber 4F1, 4R1 and the 2 nd linear rubber 4F2, 4R 2. In the 1 st constricted portion S1 of the waist gather G2, 3 pieces of the 1 st linear rubbers 4F1, 4R1 are arranged in parallel with each other at a constant interval a 1. In the 2 nd constricted portion S2 of the waist gather G2, a plurality of 2 nd linear rubbers 4F2 and 4R2 are provided in parallel with each other at a constant interval a 2. In the present embodiment, the distance a1 between the 1 st linear rubbers 4F1 and 4R1 in the 1 st contracted part S1 is set to be larger than the distance a2 between the 2 nd linear rubbers 4F2 and 4R2 in the 2 nd contracted part S2, and thus the 1 st contracted part S1 has a moisture discharge function of discharging moisture in the inner space of the diaper 1 to the outside and a function of easily expanding the trunk opening 2T. On the other hand, the 2 nd contraction part S2 of the waist gather G2 has a position holding function (slip suppressing function) of suppressing slipping off when the diaper 1 is worn by increasing the contraction force in the trunk direction as compared with the 1 st contraction part S1. The interval between the linear rubbers as referred to herein means a dimension in which the adjacent linear rubbers are separated from each other in the longitudinal direction of the diaper (direction connecting the front and rear bodice regions).

In the present embodiment, the 1 st linear rubbers 4F1 and 4R1 of the waist portion 1-st region RW1 and the 2 nd linear rubbers 4F2 and 4R2 of the waist portion 2-st region RW2 extend over the entire width of the cover sheets 4F and 4R. Thus, after completion of the diaper 1, the 1 st linear rubbers 4F1, 4R1 and the 2 nd linear rubbers 4F2, 4R2 form a substantially annular stretchable member that is looped along the trunk opening 2T. In other words, after completion of the diaper 1, the waist gather G2 (the 1 st contracted part S1, the 2 nd contracted part S2) is formed over the entire circumference in the trunk direction.

In the abdomen 1 region RT1 as well, when the 3 rd linear rubbers 4F3 and 4R3 sandwiched and bonded in an extended state between the layers of the outer covering portions 4F10 and 4R10 of the covering pieces 4F and 4R and the inner covering pieces 5F and 5R contract, the portions of the outer covering portions 4F10 and 4R10 of the covering pieces 4F and 4R and the inner covering pieces 5F and 5R corresponding to the abdomen 1 region RT1 follow the contraction of the 3 rd contracted portion S3 causing the abdomen 1 region RT1 to contract in the trunk direction. The 3 rd contracted portion S3 is a region that fits around the height of the waist bone of the wearer when the diaper 1 is worn. In the present embodiment, it is preferable to avoid an excessive pressing feeling to the wearer by making the contraction force (hereinafter, also referred to as "spreading strength") of the 3 rd contracted part S3 smaller than the 2 nd contracted part S2 that performs the position holding function (slip-off suppressing function).

In the abdomen area 2 RT2, when the 4 th linear rubbers 4F4 and 4R4 sandwiched and bonded in an extended state between the layers of the outer covering portions 4F10 and 4R10 and the inner covering pieces 5F and 5R of the covering pieces 4F and 4R contract, the outer covering portions 4F10 and 4R10 of the covering pieces 4F and 4R and the portions of the inner covering pieces 5F and 5R corresponding to the abdomen area 2 RT2 are continuously flexed in a pleated state following the contraction of the 4 th contracted portion S4 that contracts the abdomen area 2 RT2 in the trunk direction. In the present embodiment, the abdomen gather G3 is formed mainly by the 3 rd contracted portion S3 formed in the abdomen 1 st region RT1 and the 4 th contracted portion S4 formed in the abdomen 2 nd region RT 2. The abdomen gather G3 improves the fit of the diaper 1 around, for example, the lower abdomen of the wearer (japanese: lower abdomen setback り) by the contractile force of the 3 rd linear rubbers 4F3 and 4R3 and the 4 th linear rubbers 4F4 and 4R 4.

In the present embodiment, the linear rubbers 4F1, 4R1, 4F2, 4R2, 4F3, 4R3, 4F4, and 4R4 are provided to extend in the width direction (the trunk direction) of the cover pieces 4F and 4R so as to form the 1 st to4 th constrictions S1 and S4, but the linear rubbers are not limited thereto, and other materials and forms may be used as long as they are linear expansion members. In the present specification, "linear" means a form elongated and extending in a specific direction, and is a concept including a strip-like or rectangular shape. Examples of the material of the linear rubber include natural rubber and synthetic rubber, but are not limited to a specific material.

Next, the air- passage forming sheets 11F and 11R of the diaper 1 will be described. As shown in fig. 2 and 3, the diaper 1 includes air-permeable path-forming sheets 11F and 11R laminated and arranged on the skin of the flap portions 4F5 and 4R5 and the pad cover sheet 6 so as to straddle the longitudinal end regions of the flap portions 4F5 and 4R5 of the cover sheets 4F and 4R and the pad cover sheet 6 and the center sheet 9 of the absorbent portion main body 15. The air- passage forming sheets 11F and 11R form skin contact surfaces in the waist gather G2 of the diaper 1. The "skin contact surface" means a surface that is directly contacted with the skin of the wearer when the diaper 1 is worn, that is, the innermost surface of the diaper 1.

Fig. 4 is a diagram illustrating an installation manner of the air- passage forming sheets 11F and 11R of the diaper 1 according to the embodiment. Fig. 4(a) is a view showing a state where the 1 st contracted portion S1 of the waist gather G2 is viewed from the side of the inner space of the diaper 1. Fig. 4 (B) is a view schematically showing the internal structure of the 1 st contracted portion S1 of the waist gather G2 when viewed from the side of the diaper 1. Fig. 4 (C) is a view showing the state of looking at the 1 st contracted portion S1 of the waist gather G2 from above the diaper 1 (i.e., in the viewing direction of a of (B)). For convenience, fig. 4(a) and (C) show the state of the 1 st contracted portion S1 before contraction in the waist gather G2. Fig. 4(D) is a view showing a state where the 1 st contracted portion S1 of the contracted waist gather G2 is viewed from above.

The air-passage-forming sheets 11F and 11R are stacked so as to cover at least a part of the folded portions 4F5 and 4R5 forming the skin-facing surface of the 1 st contracted portion S1 of the waist 1-st region RW1, and are joined to the longitudinal end regions and the folded portions 4F5 and 4R5 of the cover sheet 6 via joining portions denoted by reference numeral S. In the present embodiment, the joint S is formed by joining the folded portions 4F5 and 4R5 of the cover sheets 4F and 4R made of thermoplastic resin and the air- passage forming sheets 11F and 11R of the mat cover sheet 6, which are superposed on each other, by ultrasonic welding. As shown in fig. 4 a, a plurality of the joints S are intermittently arranged from the trunk opening end edges 4F9, 4R9 of the cover sheets 4F, 4R along the longitudinal direction orthogonal to the direction around the trunk (width direction), thereby forming linear joints SL extending in the longitudinal direction of the diaper 1. In other words, the 1 linear joint SL is an aggregate of a plurality of joints S intermittently arranged along the longitudinal direction of the diaper 1. Here, "intermittently" arranged means a non-continuous or intermittent arrangement.

As shown in fig. 4 a, a plurality of linear joint portions SL are intermittently arranged in the 1 st contracted portion S1 of the waist gather G2 along the direction (width direction) of the cover sheets 4F, 4R around the trunk. In the example shown in fig. 4(a), the linear bonding portions SL are arranged in parallel with each other, and the intervals between the linear bonding portions SL are set to alternate in size. That is, the linear joints SL are intermittently arranged in a state where two lines formed by 1 set of the linear joints SL are arranged at equal intervals around the trunk direction (width direction). In fig. 3(a), the range of the linear joint portion SL extending in the longitudinal direction of the diaper 1 is shown by hatching. As shown, the linear joint SL extends across the waist 1 st region RW1 forming the 1 st contracted portion S1 and the waist 2 nd region RW2 forming the 2 nd contracted portion S2.

The ultrasonic bonding of the air-passage-forming sheets 11F, 11R to the folded portions 4F5, 4R5 and the like is performed in a state where the 1 st linear rubbers 4F1, 4R1 and the 2 nd linear rubbers 4F2, 4R2 of the waist gather G2 are in an extended state. After the air passage forming sheets 11F and 11R are joined to the folded portions 4F5, 4R5, etc., the stretched state of the 1 st linear rubbers 4F1 and 4R1 and the 2 nd linear rubbers 4F2 and 4R2 sandwiched and fixed between the sheet layers is released. As a result, the waist gather G2 contracts, and the interval between the linear joint portions SL in the air-passage-forming sheets 11F and 11R narrows. Thus, the non-joined region 110 between the linear joint portions SL in the air passage forming sheets 11F and 11R is deformed into a wavy shape by bending.

As a result, the folded portions 4F5 and 4R5 of the cover sheets 4F and 4R and the non-joined regions 110 of the air-passage-forming sheets 11F and 11R are separated from each other, and thereby the 1 st air-passage 111 surrounded by the folded portions 4F5 and 4R5 and the non-joined regions 110 of the air-passage-forming sheets 11F and 11R is formed as shown in fig. 4 (D). Further, the 2 nd air passage 112 can be formed on the skin contact surface 11a side of the air passage forming sheets 11F, 11R. The reference symbol SS shown by a two-dot chain line in fig. 4(D) represents a virtual line of the skin surface that comes into contact with the air passage forming sheets 11F, 11R when the diaper 1 is worn by the wearer. The 2 nd air passage 112 is formed as a gap formed between the skin contact surface 11a of the air passage forming sheets 11F, 11R and the skin of the wearer when the wearer wears the diaper 1. Moisture in the internal space of the diaper 1 can be discharged to the outside through the 1 st air permeation passage 111 and the 2 nd air permeation passage 112 formed in the waist gather G2. The 1 st air permeation path 111 is an air permeation path through which moisture permeating the air permeation path formation sheets 11F and 11R from the inner space of the diaper 1 passes. On the other hand, the 2 nd air-permeable passage 112 is an air-permeable path that directly communicates the internal space and the external space of the diaper 1, and can discharge moisture in the diaper 1 more smoothly.

As shown in fig. 4(D), after contraction of the waist gather G2, the relatively large 1 st fold 41 and the relatively small 2 nd fold 42 forming the 1 st contracted portion S1 are alternately formed. In addition, the air passage-forming sheets 11F, 11R, which are flexed into a wave shape, are also alternately formed with relatively large 1 st pleats 113 and relatively small 2 nd pleats 114. This is because the intervals between the linear bonding portions SL are set to alternate in size. That is, the large 1 st pleats 41, 113 are formed by the pair of linear joint portions SL having wide intervals, and the small 2 nd pleats 42, 114 are formed by the pair of linear joint portions SL having narrow intervals.

Here, the 1 st fold 113 of the air passage-forming sheets 11F, 11R that are flexed into a wave shape functions to secure the large 1 st air permeation passage 111 in cooperation with the 1 st fold 41 forming the 1 st constricted portion S1. On the other hand, the 2 nd pleats 114 of the air passage forming sheets 11F, 11R function to form the 1 st air permeable passage 111 in cooperation with the 2 nd pleats 42 forming the 1 st constricted parts S1 and to ensure an air permeable cross section of the 2 nd air permeable passage 112 by appropriately separating the 1 st pleats 113 adjacent in the trunk direction (width direction) from each other. In the present embodiment, by providing the grooved structure formed by the air passage forming sheets 11F and 11R that are deformed into a wave shape following the contraction of the 1 st contraction portion S1 on the skin contact surface side of the waist gather G2, moisture in the diaper 1 can be effectively discharged to the outside through the 1 st air passage 111 and the 2 nd air passage 112. In the present embodiment, since the linear joints SL are formed as an aggregate of a plurality of joints S intermittently arranged along the longitudinal direction of the diaper 1, the 1 st air-permeable paths 111 adjacent to each other communicate with each other through the gaps between the joints S. Therefore, the air permeability between the adjacent 1 st air permeation paths 111 can be improved, and the wearer can be less likely to be locally affected by moist heat.

The air- passage forming sheets 11F and 11R in the present embodiment are provided with a large number of fine air-permeable holes 11F1 and 11R1 for air permeation. Here, the air-permeable hole means an opening portion that communicates a space on one surface side of the sheet with a space on the other surface side, and the shape thereof is not particularly limited. Thus, the openings having a shape such as a circle, an ellipse, or a polygon (triangle, quadrangle, etc.) can be applied as the ventilation holes 11F1 and 11R 1. The formation of the permeable holes 11F1 and 11R1 in the air-passage-forming sheets 11F and 11R does not mean that the air-passage-forming sheets 11F and 11R are made of a material having no air permeability, and the air-passage-forming sheets 11F and 11R may be made of a material having air permeability or a material having no air permeability. The air-permeable path-forming sheets 11F and 11R are preferably air-permeable and liquid-permeable materials, but may be non-air-permeable materials, for example. The size and number of the vent holes 11F1 and 11R1 are not particularly limited, but for example, the opening area is 0.5 to 10mm²Preferably, about 5 to 200 holes are formed.

As described above, in the diaper 1 of the present embodiment, in order to make the 1 st contraction part S1 located on the trunk opening part 2T side in the waist gather G2 perform the moisture discharging function and make the 2 nd contraction part S2 perform the position holding function (slip suppressing function) of the diaper 1, the arrangement form of the 1 st linear rubbers 4F1, 4R1 (1 st stretching member) disposed in the 1 st contraction part S1 and the arrangement form of the 2 nd linear rubbers 4F2, 4R2 (2 nd stretching member) disposed in the 2 nd contraction part S2 are different. That is, by setting the interval a1 between the 1 st linear rubbers 4F1 and 4R1 in the 1 st constricted part S1 to be larger than the interval a2 between the 2 nd linear rubbers 4F2 and 4R2 in the 2 nd constricted part S2, the moisture exhausting function of the 1 st constricted part S1 and the slip suppressing function of the 2 nd constricted part S2 are both satisfied.

As a result of intensive studies, the inventors of the present invention found that "by arranging the 1 st linear rubbers 4F1 and 4R1 forming the 1 st contracted portion S1 at a constant interval from each other and setting the interval a1 to 6.5mm or more and 20mm or less, the air permeability and ease of putting on and off of the waist gather G2 in the diaper 1 can be improved as compared with the conventional one", and particularly, the finding that "the interval a1 is more preferably set to 6.5mm or more and 13mm or less" from the viewpoint of improving the air permeability and ease of putting on and off of the waist gather G2 "is obtained. Hereinafter, the operation and effect of the diaper 1 of embodiment 1 will be described by comparing the diaper 1 of embodiment 1 with the diaper 101 of comparative example.

Fig. 5 is a view schematically showing a state where the diaper 101 of the comparative example is developed. Fig. 5(a) schematically shows the internal configuration in the case where the diaper 101 is developed as viewed from the left side. Fig. 5 (B) schematically shows a planar configuration of the diaper 101 when unfolded. The diaper 101 of the comparative example is similar to the diaper 1 of embodiment 1 shown in fig. 3 and the like, except that the number and the interval of the 1 st linear rubbers 4F1 and 4R1 are different. Thus, in the diaper 101 shown in fig. 5, the same components as those of the diaper 1 are denoted by the same reference numerals as those of the diaper 1, and detailed description thereof will be omitted.

As shown in fig. 5, in the diaper 101 of the comparative example, the 1 st linear rubbers 4F1, 4R1 are provided so as to extend in the left-right direction along the trunk opening end edges 4F9, 4R9 of the cover sheets 4F, 4R, respectively. The 1 st linear rubbers 4F1 and 4R1 of the diaper 101 of the comparative example were arranged in parallel at a constant interval B1. Here, the interval B1 between the 1 st linear rubbers 4F1 and 4R1 in the diaper 101 of the comparative example is set to be smaller than the interval a1 between the 1 st linear rubbers 4F1 and 4R1 in the diaper 1 of embodiment 1. For example, the interval B1 between the 1 st linear rubbers 4F1 and 4R1 of the diaper 101 of the comparative example is set to 5 mm.

Next, fig. 6 is a diagram illustrating the interval B1 between the 1 st linear rubbers 4F1 and 4R1 and the gathers formed in the 1 st contracted portion S1 of the diaper 101 of the comparative example. Fig. 6(a) to (D) correspond to fig. 4(a) to (D), respectively. Fig. 6(a) is a view showing a state in which the diaper 101 of the comparative example is viewed from the inner space side of the diaper 101 with the waist gather G2 (the 1 st contracted portion S1) in the waist 1 st region RW 1. Fig. 6 (B) is a view schematically showing the internal structure of the waist gather G2 (the 1 st contracted portion S1) in the waist 1 st region RW1 when viewed from the side of the diaper 101. Fig. 6 (C) is a view showing a state where the waist 1 st region RW1 is viewed from above the diaper 101. For convenience, fig. 6(a) and (C) show the state before contraction of the waist gather G2 (the 1 st contracted portion S1) in the waist 1 st region RW 1. Fig. 6(D) is a view showing the diaper 101 in a state where the waist gather G2 (the 1 st contracted portion S1) is contracted as viewed from above.

As shown in fig. 4(D) and 6(D), the size of the 1 st and 2 nd gathers 41 and 42 formed by the contraction of the 1 st contracted portion S1 of the waist gather G2 by the contraction force of the 1 st linear rubbers 4F1 and 4R1 is larger in the diaper 1 of embodiment 1 than in the diaper 101 of comparative example. The reason for this is as follows.

Fig. 7A is a view explaining the pleats in the 1 st contracted portion S1 of the waist gather G2 in embodiment 1. Fig. 7A (a) is a view schematically showing a state where the pleats in the 1 st constricted part S1 of embodiment 1 are viewed from the front. Fig. 7A (B) is a diagram schematically showing a state where the pleats in the 1 st constricted part S1 of embodiment 1 are viewed from the side. Fig. 7B is a diagram illustrating the pleats in the 1 st contracted portion S1 of the waist gather G2 of the comparative example. Fig. 7B (a) is a schematic view showing a state where the folds in the 1 st constricted part S1 of the comparative example are viewed from the front. Fig. 7B (B) is a diagram schematically showing a state where the folds in the 1 st constricted part S1 of the comparative example are viewed from the side.

Here, since the 1 st linear rubbers 4F1 and 4R1 provided in the 1 st constricted portion S1 are bonded to the outer covering cover portions 4F10 and 4R10 and the folded-over portions 4F5 and 4R5 of the cover sheets 4F and 4R, the 1 st fold 41 and the 2 nd fold 42 of the cover sheets 4F and 4R and the 1 st fold 113 and the 2 nd fold 114 of the airway forming sheets 11F and 11R formed between the 1 st linear rubbers 4F1 and 4R1 are more restrained by the 1 st linear rubbers 4F1 and 4R1 as the distance from the 1 st linear rubbers 4F1 and 4R1 is shorter. In contrast, the interval a1 between the 1 st linear rubbers 4F1, 4R1 of the diaper 1 of embodiment 1 is wider than the interval B1 between the 1 st linear rubbers 4F1, 4R1 of the diaper 101 of comparative example. Therefore, the 1 st and 2 nd gathers 41 and 42 of the cover sheets 4F and 4R and the 1 st and 2 nd gathers 113 and 114 of the air- passage forming sheets 11F and 11R of the diaper 1 according to embodiment 1 are less likely to receive the binding force of the 1 st linear rubbers 4F1 and 4R1 as a whole than the diaper 101 according to the comparative example. As a result, the diaper 1 according to embodiment 1 can enlarge the 1 st and 2 nd gathers 41 and 42 of the cover sheets 4F and 4R and the 1 st and 2 nd gathers 113 and 114 of the air passage-forming sheets 11F and 11R, as compared with the diaper 101 of comparative example.

As described above, according to the diaper 1 of the present embodiment, the sizes of the 1 st and 2 nd gathers 41 and 42 formed in the 1 st contracted portion S1 of the waist gather G2 can be increased as compared with the diaper 101 of the comparative example, and therefore the air permeable area of the 1 st air permeable passage 111 can be made larger. Further, according to the diaper 1 of the present embodiment, the size of the 1 st fold 113 and the 2 nd fold 114 formed in the air-passage-forming sheets 11F and 11R can be increased as compared with the diaper 101 of the comparative example. This can further increase the air-permeable areas of the 1 st air-permeable passage 111 and the 2 nd air-permeable passage 112. As described above, according to the diaper 1 of the embodiment, the moisture in the diaper 1 can be discharged more smoothly.

Further, in the diaper 1 of the present embodiment, when the wearer sits down from standing, the diaper 1 is compressed from the outside, and when the wearer walks, the diaper 1 is deformed by the movement of the legs, so that moisture in the diaper 1 can be discharged to the external space through the 1 st air permeation passage 111 and the 2 nd air permeation passage 112, and the internal space of the diaper 1 can be brought into a comfortable environment. As described above, the pump effect of promoting the discharge of moisture from the inside of the diaper due to the compression deformation of the diaper 1 is combined with the arrangement mode of the 1 st linear rubbers 4F1 and 4R1 in the 1 st contracted portion S1 which contributes to the enlargement of the 1 st and 2 nd gathers 41 and 42 of the cover sheets 4F and 4R, the 1 st and 2 nd gathers 113 and 114 of the air-passage-forming sheets 11F and 11R, compared with the comparative example, and thus the synergistic effect of being able to further significantly improve the air permeability of the waist gather G2 can be obtained.

In the diaper 1 of the present embodiment, the extension length of the 1 st contracted portion S1 forming the waist gather G2 from the trunk opening 2T in the longitudinal direction connecting the front torso region 1F and the rear torso region 1R is set to be 26mm to 31 mm. Thus, there are the following advantages: when the trunk opening 2T is widened, the vicinity of the 2 nd joint of the finger is hooked on the trunk opening end edges 4F9 and 4R9, and therefore, the trunk opening 2T is easily widened when the wearer wears the diaper 1 or takes off the diaper in reverse. More specifically, when the finger tip side portion of the finger is positioned at the trunk opening end edges 4F9 and 4R9 with respect to the 1 st joint when the trunk opening 2T is expanded, the finger tip is easily unintentionally separated from the trunk opening end edges 4F9 and 4R9 during the process of expanding the trunk opening 2T. On the other hand, when the part on the base side of the finger deeper than the 2 nd joint is located at the trunk opening end edges 4F9 and 4R9 when the trunk opening 2T is expanded, the 2 nd contraction part S2 located below the 1 st contraction part S1 is expanded, and it is likely to be difficult to efficiently expand the trunk opening 2T. On the other hand, the extension length of the 1 st contracted portion S1 in the longitudinal direction of the diaper is set to be 26mm or more and 31mm or less, whereby the ease of putting on and taking off the diaper 1 can be improved. In addition, the following advantages also exist: when the diaper 1 is expanded, the tips of the fingers do not sink into the air-passage-forming sheets 11F and 11R forming the skin-contacting surface of the waist gather G2 of the diaper 1, and breakage of the air-passage-forming sheets 11F and 11R can be suppressed.

In the diaper 1 of the present embodiment, the 1 st contracted portion S1 has a laminated structure in which at least 3 layers of sheet members are laminated. Thus, even when the fingers of the handler enter between the 1 st linear rubbers 4F1, 4R1 disposed in the 1 st contracted portion S1 when the diaper 1 is put on by the baby (wearer), the cover sheets 4F, 4R forming the 1 st contracted portion S1 can be prevented from being broken.

In the diaper 1 of the present embodiment, the interval a2 between the 2 nd linear rubbers 4F2 and 4R2 in the 2 nd contracted part S2 forming the waist gather G2 is set to be smaller than the interval a1 between the 1 st linear rubbers 4F1 and 4R1 in the 1 st contracted part S1, so that the 2 nd contracted part S2 can be made to appropriately exhibit the slip-off suppressing function of suppressing the slip-off of the diaper 1. That is, the entire waist gather G2 can exhibit a moisture discharge function of discharging moisture in the inner space of the diaper 1 to the outside and also appropriately suppress slipping-off of the diaper 1.

In the diaper 1 of the present embodiment, the width dimension of the 2 nd contracted portion S2 extending in the diaper longitudinal direction (direction orthogonal to the direction around the trunk) is preferably 10mm or more. By setting the extension width of the 2 nd contracted portion S2 as described above, it is easy to suppress the 2 nd contracted portion S2 from sinking into the skin of the wearer when the handler puts the diaper 1 on the wearer. In the diaper 1 of the present embodiment, the extension width of the 2 nd contracted portion S2 in the diaper longitudinal direction is preferably 26mm or less. By this, there are the following advantages: when the diaper 1 is worn, the wearer is less likely to have an excessively oppressive feeling because the wearer's navel is less likely to be covered with the waist gather G2.

< test results >

Next, a diaper corresponding to an example of the diaper 1 of the above embodiment and a diaper corresponding to the diaper 101 of the above comparative example were prepared, and a quantitative air permeability test, a fog permeability test, a spreading strength test, and the like were performed on each diaper. Hereinafter, a diaper corresponding to an example of the diaper 1 of the embodiment is referred to as "example", and a diaper corresponding to the diaper 101 of the comparative example is referred to as "comparative example".

[ gas permeability quantitative test ]

First, the air permeability quantitative tests for examples and comparative examples will be described. Fig. 8 is a diagram illustrating a wind speed measurement position in the air permeability quantitative test. As test conditions, the diaper to be tested was worn on the dummy, and the velocity (wind velocity) of air discharged from the inside to the outside of the diaper when 20L/min of air was ejected from the crotch of the dummy was measured by a wind velocity measuring instrument. For the measurement of the wind speed, a commercially available hot-wire anemometer (manufactured by Kyowa Kagaku K.K. (Japanese: Paisho テストー) was used, and the product number was testo425, and the wind speed resolution was 0.01 m/s.

Table 1 shows various specifications of examples and comparative examples. The number of samples used in the test was 3 for each of 3 types of Big size, L size, and M size in examples 1 to 3 and comparative examples 1 to 3. In addition, the kind, number and interval of the 1 st linear rubbers 4F1 and 4R1 forming the 1 st constricted portion S1 in the waist gather G2 are shown in the table of the draft ratio (Japanese: ドラフト ratio) in each size of examples and comparative examples. As shown in table 1, examples 1 to 3 and comparative examples 1 and 2 were each provided with a breathable path-forming sheet in order to provide the waist gather G2. On the other hand, comparative example 3 was designed to have no air-permeable path-forming sheet in the waist gather G2.

[ Table 1]

In the air permeability quantitative test, as shown in fig. 8, the wind speed was measured at 5 points a to E, which are different in the vertical direction separation distance from the edge of the open end of the trunk, at the widthwise center of the rear large portion of the diaper. The vertical direction herein means a direction perpendicular to the width direction along the outer cover surface of the diaper. The measurement position A was set to a position 1cm above the end edge of the trunk opening. As shown in fig. 8, the measurement positions B to E are located below the trunk opening edge and the distances from the trunk opening edge are set to 0.5cm, 1.5cm, 2.5cm, and 3.5cm, respectively.

In the measurement positions B to E, the probe of the wind speed measuring instrument was held in a vertical posture with respect to the outer surface (cover sheet surface) of the diaper, and wind speed measurement was performed in a state in which the tip of the probe was opposed to the outer surface of the diaper. On the other hand, in the measurement position a, the probe of the wind speed measuring instrument was held in a posture along the back of the dummy, and wind speed measurement was performed in a state where the tip of the probe was opposed to the gap between the back surface of the dummy and the waist gather of the diaper.

The results of the permeability quantification test are shown in table 2.

[ Table 2]

In the measurement position a, it is considered that the flow of air leaking to the outside from the gap between the waist gather G2 and the dummy skin is dominant. Then, in each of examples and comparative examples, when the measurement results of the wind speed at the measurement position a were examined, as shown in table 2, the results of the wind speeds significantly increased in each of example 1 (linear rubber interval 6.5mm), example 2 (linear rubber interval 13mm), and example 3 (linear rubber interval 20mm) as compared with comparative example 1 (linear rubber interval 5mm) and comparative example 3 (linear rubber interval 5mm, no air-path formation piece). Therefore, it can be said that the air permeability of the waist gather G2 is greatly improved in examples 1 to 3 as compared with comparative examples 1 and 3. In addition, it can be evaluated as: by ensuring that the interval between the 1 st linear rubbers 4F1 and 4R1 forming the 1 st constricted portion S1 in the waist gather G2 is 6.5mm or more, the air permeability of the waist gather G2 can be improved. In addition, no significant difference was observed between each example and each comparative example with respect to the measurement positions B to E.

Table 2 also shows the sensory evaluation results regarding the ease of putting on and taking off (ease of putting on and taking off) of the examples and comparative examples. Sensory evaluation was evaluated by 5 evaluators. Among 5 evaluators, the case where 4 or more answers were good was evaluated as "o", the case where 3 answers were good was evaluated as "Δ", and the case where 2 or less answers were good was evaluated as "x". In comparative example 1 and comparative example 3 in which the gap between the linear rubbers in the waist gather G2 was set to 5mm, the linear rubbers in the waist gather G2 had high contractility, and a large force was required to stretch the linear rubbers in the waist gather G2 when the diaper was worn. On the other hand, the results of "examples 1 to 3 in which the interval between the linear rubbers in the waist gather G2 was set to be in the range of 6.5mm to 20 mm" were obtained in which a large force was not required and the diaper was easily pulled up when the linear rubber in the waist gather G2 was stretched in wearing the diaper, as compared with comparative examples 1 and 3 ".

In contrast, in comparative example 2 in which the interval between the linear rubbers in the waist gather G2 was set to 25mm, the interval between the linear rubbers was too wide, and therefore, the fingers were not caught and the gather was not easily pulled up. From the viewpoint of ease of putting on and taking off the diaper, it can be said that the interval between the linear rubbers in the waist gather G2 is preferably 20mm or less. In addition, it is known that: in comparative example 2, the air permeability of the waist gather G2 was approximately the same as in examples 1 to 3, but the diaper was inferior to that in comparative example 2 in terms of the ease of putting on and taking off the diaper, compared with examples 1 to 3. From the above, it can be evaluated that: when comprehensively judged from the viewpoint of breathability of the waist gather G2 and the viewpoint of ease of wearing of the diaper, the interval between the 1 st linear rubber 4F1 and 4R1 forming the 1 st constricted portion S1 in the waist gather G2 is preferably set to 6.5mm to 20 mm.

Further, when comparing the examples, the result was obtained that "the air permeability of the waist gather G2 was approximately the same, but the diaper was more excellent in the ease of putting on and taking off than example 3 (the linear rubber interval was 20mm) in example 1 (the linear rubber interval was 6.5mm) and example 2 (the linear rubber interval was 13 mm)". From this viewpoint, it can be said that, in particular, from the viewpoint of improving the air permeability and ease of wearing of the waist gather G2, it is preferable to set the interval between the 1 st linear rubbers 4F1 and 4R1 forming the 1 st constricted portion S1 in the waist gather G2 to be 6.5mm to 13 mm.

[ fog penetration test ]

Next, the test conditions and results of the mist permeability test for examples and comparative examples will be described. In the fog penetration test, the diaper of the test object (example 1, comparative example 1) was worn on the diaper wearing section 202 having the fog ejection port 201 using the fog penetration test machine 200 shown in fig. 9, and the state of fog penetrating from the waist gather of the diaper to the outside was visually observed when air containing a certain amount of fog was continuously sent out from the fog ejection port 201 (flow rate 5 m/min) within 15 seconds. The mist ejection port 201 was rectangular in shape having a longitudinal dimension of 25mm and a transverse dimension of 25mm, and the diaper to be tested was worn on the diaper wearing section 202 so that the waist gather G2 was positioned on the front surface of the mist ejection port 201, and the mist permeability test was performed. Fig. 9 shows a state where the mist is ejected from the mist ejection port 201 in a state where the diaper is not worn on the diaper wearing section 202.

Here, 3 samples for the mist permeability test were prepared for each of the dimensions (Big dimension, L dimension, and M dimension) of example 1 and comparative example 1. The results of the mist permeability test for the L size and Big size are shown in table 3. In addition, the results of the mist permeability test for the M size are shown in table 4. As is clear from the results of the fog-through-air test for example 1 and comparative example 1, more fog leaked in the longitudinal direction from the waist gather in example 1 than comparative example 1. Here, in example 1, the interval between the 1 st linear rubbers 4F1 and 4R1 forming the 1 st contracted portion S1 in the waist gather G2 is wider than that in comparative example 1, and therefore, larger gathers can be formed in the 1 st contracted portion S1. As a result, it is considered that: by the synergistic effect with the waist gather configuration including the air-permeable path forming sheet, the amount of mist discharged from the air-permeable path formed between the waist gather G2 and the diaper wearing portion 202 is increased in example 1 as compared with comparative example 1, and the air permeability of the waist gather G2 is improved.

[ Table 3]

[ Table 4]

[ enlarged photograph of waist gather ]

Fig. 10A is an enlarged photograph of the pleats forming the waist gather of the example. Fig. 10B is an enlarged photograph of the pleats forming the waist gather of the comparative example. Comparing the examples and comparative examples, it can be seen that: the size of the pleats forming the waist gather is larger in the examples compared to the comparative examples. That is, it can be said that the air permeability of the waist gather in the examples is more excellent than that in the comparative examples.

Next, the diaper of the present embodiment will be further described. In the diaper 1 of the present embodiment, the 1 st contraction part S1 includes the 1 st linear rubbers 4F1, 4R1 provided along the 1 st region RW1 near the trunk opening end edges 4F9, 4R9 and extending in the trunk direction, and contracts the trunk opening part in the trunk direction. The 2 nd contraction part S2 includes the 2 nd linear rubber 4F2, 4F2 provided in the waist 2 nd region RW2 adjacent on the crotch region 1B side with respect to the 1 st contraction part S1 and extending in the torso direction, and contracts the torso opening part in the torso direction. In the diaper 1 of the present embodiment, the extension length of the 1 st contracted portion S1 forming the waist gather G2 from the trunk opening 2T in the longitudinal direction connecting the front torso region 1F and the rear torso region 1R is set to be 26mm to 31 mm. Thus, there are the following advantages: when the trunk opening 2T is widened, the vicinity of the 2 nd joint of the finger is hooked on the trunk opening end edges 4F9 and 4R9, and therefore, the trunk opening 2T is easily widened when the wearer wears the diaper 1 or takes off the diaper in reverse. More specifically, when the finger tip side portion of the finger is positioned at the trunk opening end edges 4F9 and 4R9 with respect to the 1 st joint when the trunk opening 2T is expanded, the finger tip is easily unintentionally separated from the trunk opening end edges 4F9 and 4R9 during the process of expanding the trunk opening 2T. On the other hand, when the part on the base side of the finger deeper than the 2 nd joint is located at the trunk opening end edges 4F9 and 4R9 when the trunk opening 2T is expanded, the 2 nd contraction part S2 located below the 1 st contraction part S1 is expanded, and it is likely to be difficult to efficiently expand the trunk opening 2T. On the other hand, the extension length of the 1 st contracted portion S1 along the longitudinal direction of the diaper 1 is set to be 26mm or more and 31mm or less, whereby the ease of putting on and taking off the diaper 1 can be improved. In addition, the force (widening strength) required for the 1 st constricted part S1 to expand in the lateral direction is smaller than that of the 2 nd constricted part S2. This can further improve the ease of putting on and taking off the diaper 1. In addition, there are also the following advantages: when the diaper 1 is expanded, the tips of the fingers do not sink into the air-passage-forming sheets 11F and 11R forming the skin-contacting surface of the waist gather G2 of the diaper 1, and breakage of the air-passage-forming sheets 11F and 11R can be suppressed.

In the diaper 1 of the present embodiment, the 1 st contracted portion S1 has a laminated structure in which at least 3 layers of sheet members are laminated. Thus, even when the fingers of the handler enter between the linear rubbers 4F2 and 4R2 disposed in the 1 st contracted portion S1 when the diaper 1 is put on by the baby (wearer), the cover pieces 4F and 4R forming the 1 st contracted portion S1 can be prevented from being broken.

In the diaper 1 of the present embodiment, 4 linear rubbers 4F3 and 4R3 in the 2 nd contracted portion S2 forming the waist gather 3R are provided in parallel at predetermined intervals (hereinafter, referred to as "interval a 2"). Since the interval a2 is set to be smaller than the interval a1 of the linear rubbers 4F2 and 4R2 in the 1 st contracted part S1, the 2 nd contracted part S2 can be made to suitably exhibit a slip-off suppressing function of suppressing slip-off of the diaper 1. That is, the waist gather 3R as a whole can exhibit a moisture discharge function of discharging moisture in the inner space of the diaper 1 to the outside and also can suitably suppress slipping-off of the diaper 1.

In the diaper 1 of the present embodiment, the width dimension of the 2 nd contracted portion S2 extending in the diaper longitudinal direction (direction orthogonal to the direction around the trunk) is preferably 20mm or more. By setting the extension width of the 2 nd contracted portion S2 as described above, when the wearer wears the diaper 1, the 2 nd contracted portion S2 is easily suppressed from sinking into the skin of the wearer. In the diaper 1 of the present embodiment, the extended width of the 2 nd contracted portion S2 in the diaper longitudinal direction is preferably 40mm or less. For example, when the range from the trunk opening end edges 4F9 and 4R9 in which the 1 st pars contractilis S1 extends in the longitudinal direction is 31mm, the range from the trunk opening end edges 4F9 and 4R9 in which the 2 nd pars contractilis S2 extends in the longitudinal direction is 31mm or more and 71mm or less. When the range from the trunk opening end edges 4F9 and 4R9 of the 1 st contracted portion S1 extending in the longitudinal direction is 26mm, the range from the trunk opening end edges 4F9 and 4R9 of the 2 nd contracted portion S2 extending in the longitudinal direction is 26mm or more and 66mm or less. That is, the width dimension of the 2 nd contraction part S2 extending in the diaper longitudinal direction is 20mm or more and 40mm or less, and the range of the 2 nd contraction part S2 extending in the longitudinal direction from the trunk opening end edges 4F9 and 4R9 is 26mm or more and 71mm or less. In this case, the 1 st and 2 nd constrictions S1 and S2 may be adjacent. Thus, the diaper 1 can position the linear rubber 4F3 in the vicinity of the portions where the left and right ends of the pelvis of the wearer are located, and hold the 2 nd contraction part S2 at the waist of the wearer, with the 2 nd contraction part S2 corresponding to the pelvis contact position where the pelvis of the wearer (for example, an infant) is in contact with.

< experiment >

Next, a diaper corresponding to an example of the diaper 1 of the present embodiment and a diaper corresponding to the diaper 101 of the comparative example as described above were prepared, and the slip-off suppressing function of the diapers was evaluated. Hereinafter, a diaper corresponding to a sample of the diaper 1 of embodiment 2 will be referred to as "example". Hereinafter, a comparative diaper corresponding to the diaper 101 of the comparative example will be referred to as "comparative example".

In this experiment, "ROICA (Japanese: ロイカ) HS 470 dtex" was used as the linear rubbers corresponding to the linear rubbers 4F2, 4R2 and "ROICA CR 470 dtex" was used as the linear rubbers corresponding to the linear rubbers 4F3, 4R3, 4F4, 4R4 in both the examples and comparative examples. In the examples, the draft ratios of the linear rubbers corresponding to the linear rubbers 4F2 and 4R2 were 345%, the draft ratios of the linear rubbers corresponding to the linear rubbers 4F3 and 4R3 were 315%, and the draft ratios of the linear rubbers corresponding to the linear rubbers 4F4 and 4R4 were 330%. In the comparative example, the draft ratio of the linear rubber corresponding to the linear rubbers 4F2 and 4R2 was 345%, the draft ratio of the linear rubber corresponding to the linear rubbers 4F3 and 4R3 was 285%, and the draft ratio of the linear rubber corresponding to the linear rubbers 4F4 and 4R4 was 285%.

< experiment 1>

In experiment 1, 5 infants and children were allowed to wear the diapers of examples and comparative examples and freely play for 2 hours, and the slipping-off of the diapers was confirmed. Table 5 shown below shows the results of experiment 1. In table 5, the column "abdominal circumference (cm)" shows the abdominal circumference of each subject.

[ Table 5]

	Abdominal circumference (cm)	Examples	Comparative example
				Subject A	48	○	△
Subject B	46	○	△
				Subject C	44	△	△
Subject D	43	△	×
				Subject E	42	△	×

In table 5, the symbol "o" described in the column of "example" indicates no slipping. The symbol "Δ" in the columns of "examples" and "comparative examples" indicates that there was almost no slippage. The symbol "x" in the column of "comparative example" indicates the result of slipping. As shown in table 5, the diapers of the examples had higher slip suppressing function than the diapers of the comparative examples.

< experiment 2>

In experiment 2, the slip-off suppressing function of the infant when crawling (Japanese: ずりばい) was evaluated. Specifically, a dummy in a sitting posture wearing a diaper was placed on a pad made of EVA (ethylene-vinyl acetate copolymer), and the diaper was allowed to absorb and hold 150cc of artificial urine. The dummy weighs 4kg and is a size corresponding to the L size of the infant. Artificial urine was prepared by dissolving 20g of urea, 8g of sodium chloride, 0.8g of magnesium sulfate 7 hydrate, and 0.3g of calcium chloride 2 hydrate in 1000mL of distilled water.

The upper ends of the belly and the side belly of the abdominal circumference (お belly \12426) of the dummy were marked with symbols, and the slip of the diaper on the belly and the side belly was confirmed by performing 60 times of reciprocating motion of sliding the dummy on the EVA pad in the front-rear direction by 5cm within 1 minute.

In the diaper of the example, the slip width at the belly was 5cm, and the slip width at the flank was 0 cm. On the other hand, in the diaper of the comparative example, the slip width at the belly was 20cm, and the slip width at the side belly was 10 cm. Thus, the diaper of the example had a higher slip suppressing function than the diaper of the comparative example. This can prevent the diaper 1 from slipping off even when the baby of the wearer climbs. As described above, the diaper 1 of the present embodiment can be easily put on and taken off and can be prevented from slipping down. Therefore, the diaper 1 of the present embodiment is suitable for infants before walking with both feet.

< embodiment 2>

Next, the diaper of embodiment 2 will be explained. The diaper 1 of the present embodiment has the same components as those of the diaper of embodiment 1 described above. In the present embodiment, the same components as those in embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

Fig. 11 is a view schematically showing a state where the diaper 1 of embodiment 2 is unfolded and stretched. Fig. 11 (a) schematically shows the internal structure of the diaper 1 in an unfolded and extended state as viewed from the left side. Fig. 11 (B) schematically shows a plan view of the diaper 1 in an unfolded and stretched state.

In the diaper 1 of the present embodiment, the longitudinal end of the absorbent body 8 is in contact with the 1 st contracted portion S1. In other words, the longitudinal end of the absorbent body 8 extends to the end of the 1 st contracted portion S1. Accordingly, the moisture from the liquid-absorbed absorbent body 8 can be effectively discharged to the outside through the 1 st air-permeable passage 111 and the 2 nd air-permeable passage 112 formed by the contraction of the 1 st contraction portion S1.

In the diaper 1 of the present embodiment, the 1 st contraction part S1 includes the 1 st linear rubber 4F1, 4R1 provided in the waist 1 st region RW1 near the trunk opening end edges 4F9, 4R9 and extending in the trunk direction, and contracts the trunk opening part in the trunk direction. The 2 nd contraction part S2 includes the 2 nd linear rubber 4F2, 4R2 provided in the waist 2 nd region RW2 adjacent on the crotch region 1B side with respect to the 1 st contraction part S1 and extending in the torso direction, and contracts the torso opening part in the torso direction. When the diaper 1 of the present embodiment is viewed in plan, the longitudinal end of the absorbent body 8 overlaps the 2 nd contracted portion S2. The 2 nd contracted portion S2 extends in the longitudinal direction of the diaper 1 over a range of 15mm, and the interval A2 between the 2 nd linear rubbers 4F2 and 4R2 is 5mm to 7 mm. In the 2 nd constricted part S2, the absorber 8 and the 2 nd linear rubbers 4F2 and 4R2 may be disposed with a sheet member (for example, the back sheet 7) in between or may be in contact with each other.

[ Experimental example ]

In this embodiment, the same experiment as the air permeability quantitative experiment in embodiment 1 was also performed.

The results of the permeability quantification test are shown in table 3. In table 3, the column of "measurement positions" shows the same measurement positions a to E (see fig. 8) as in embodiment 1, and the rows of the measurement positions a to E show the wind speeds (m/s) at the respective measurement positions. In the present experimental example, diapers of 3 sizes, i.e., M size, L size, and Big size, were produced in comparative example 1 and example 4.

[ Table 6]

As shown in Table 6, at the measurement site A, a result was obtained in which the wind speed was significantly increased in example 4(0.24m/s) as compared with comparative example 1(0.02 m/s). On the other hand, no significant difference was observed between example 4 and comparative example 1 with respect to the measurement positions B to E. In the measurement position a, it is considered that the flow of air leaking to the outside from the gap between the waist gather G2 and the dummy skin is dominant. Therefore, it can be said that example 4, in which the wind speed at the measurement position a is significantly increased as compared with comparative example 1, has significantly improved air permeability of the waist gather G2 as compared with comparative example.

In addition, the sheet members forming the 2 nd constricted part S2 were made more numerous than the sheet members forming the 1 st constricted part S1. The 1 st constriction S1 is formed by a total of 3 sheet members of the cover sheets 4F, 4R, the folded-over portions 4F5, 4R5, and the air passage forming sheets 11F, 11R. The 2 nd constricted part S2 is formed by 7 sheet members in total of the cover sheets 4F, 4R, inner cover sheets 5F, 5R, cushion cover sheet 6, back sheet 7, center sheet 9, folded-over parts 4F5, 4R5, and air- passage forming sheets 11F, 11R. The 2 nd contracted portion S2 includes the absorbent body 8. Thus, the stiffness of the 2 nd constricting portion S2 is greater than that of the 1 st constricting portion S1.

The 1 st contraction part S1 has a moisture discharge function of discharging moisture in the inner space of the diaper 1 to the outside and a function of easily expanding the trunk opening 2T. On the other hand, the 2 nd contraction part S2 of the waist gather G2 has a position holding function (slip suppressing function) of suppressing slipping off when the diaper 1 is worn by increasing the contraction force in the trunk direction as compared with the 1 st contraction part S1. Further, by making the rigidity of the 2 nd constricted portion S2 greater than that of the 1 st constricted portion S1, the 1 st and 2 nd pleats 41, 42 of the cover sheets 4F, 4R and the 1 st and 2 nd pleats 113, 114 of the air passage forming sheets 11F, 11R shown in fig. 4 can be increased, and the 1 st and 2 nd air passages 111, 112 can be increased.

< experiment >

Next, a diaper corresponding to an example of the diaper 1 of embodiment 2 and a diaper corresponding to the diaper 101 of the comparative example of embodiment 1 were prepared, and the slip-off suppressing function of the diapers was evaluated. Hereinafter, a diaper corresponding to a sample of the diaper 1 of embodiment 2 will be referred to as "embodiment 4". Hereinafter, a comparative diaper corresponding to the diaper 101 of the comparative example will be referred to as "comparative example 1". In example 4 and comparative example 1, diapers for infants were also produced.

In this experiment, "ROICA HS 470 dtex" was used as the linear rubbers corresponding to the 1 st linear rubbers 4F1, 4R1 and "ROICA CR 470 dtex" was used as the linear rubbers corresponding to the 2 nd linear rubbers 4F2, 4R2, 3 rd linear rubbers 4F3, 4R3 in both example 4 and comparative example 1. In example 4, the draft of the linear rubbers corresponding to the 1 st linear rubbers 4F1 and 4R1 was 330% in the M dimension and 345% in the L dimension. On the other hand, in comparative example 1, the draft ratio of the linear rubber corresponding to the 1 st linear rubber 4F1, 4R1 was 315% regardless of the size. In both example 4 and comparative example 1, the draft ratios of the linear rubbers corresponding to the 2 nd linear rubbers 4F2 and 4R2 were 315% regardless of the size. In both example 4 and comparative example 1, the draft ratio of the linear rubber corresponding to the 3 rd linear rubbers 4F3 and 4R3 was 330% regardless of the size.

Table 7 shows a summary of the linear rubber in the 1 st constricted part and the distance between the absorber 8 and the 1 st constricted part in the 2 nd constricted part in comparative example 1 and example 4.

[ Table 7]

In example 4 and comparative example 1, the rigidity of the portions corresponding to the 1 st constricted portion S1 and the 2 nd constricted portion S2 was measured. This measurement is performed by a stiffness measurement based on a cantilever according to JISL 1069. In example 4, the stiffness of the portion corresponding to the 1 st constricted portion S1 was 61mmN, the stiffness of the portion corresponding to the 2 nd constricted portion S2 was 112 mmN. The smaller the numerical value of stiffness, the more easily bendable, and the more hardly bendable the 2 nd constricted portion of example 4 than the 1 st constricted portion, the larger the pleat. Regarding the number of gathers, the 2 nd linear rubbers 4F2 and 4R2 were cut at a width of 5cm with the vicinity of the center thereof in an extended state, and the number of gathers and the average gather height were measured in a contracted state. While 9 pieces (average pleat height 1.3mm) were used in comparative example 1, the number of pieces was 6 pieces (average pleat height 2mm) in example 4. When the cross-sectional area of the pleats, which is an index of air permeability, is compared, it is 16.25mm in comparative example 1²On the other hand, in example 4, the thickness was 25mm²In example 4, the sectional area was increased by about 1.5 times as compared with comparative example 1.

In example 4 and comparative example 1, the spreading strength of the portions corresponding to the 1 st constricted portion S1 and the 2 nd constricted portion S2 was measured.

[ broadening Strength test ]

The test of the spreading strength for example 4 and comparative example 1 will be described. Here, in each of example 4 and comparative example 1, the widening strength in the range in which the 1 st contraction part and the 2 nd contraction part in the waist gather are combined at the time of the trunk opening widening deformation was measured. Further, the spreading strength test was performed on 3 types of Big size, L size, and M size in example 4 and comparative example 1. In both of example 4 and comparative example 1, the interval between the M-size 2 nd constricted parts S2 was set to 7mm and 5, and the interval between the L-size and Big-size 2 nd linear rubbers was set to 5mm and 4.

The ring-shaped test piece prepared as described above was attached by hooking it to a jig fixed to the upper and lower grip portions of a STROGRAPH (japanese: ストログラフ) tensile testing machine (product No. YG1E, manufactured by toyoyo seiki) and the reaction force at the time of test piece expansion deformation by gradually increasing the separation distance between the upper and lower grip portions was measured by a load cell, and the expansion strength (contraction force in the direction around the trunk) of the 2 nd contraction portion in example 4 and comparative example 1 was obtained. Here, the speed at which the distance between the upper and lower chuck sections is increased is set to 200 mm/min. The spreading strength of the test piece of the M size was calculated as an average value of measurement results measured when the distance between the upper and lower chuck portions was 30cm, 44cm, and 58 cm. The spreading strength of the test piece in the L-size and Big-size was calculated as an average value of measurement results measured when the distance between the upper and lower chuck portions was 38cm, 48cm, and 62 cm.

Table 8 shows the results of the spreading strength test for example 4 and comparative example 1.

[ Table 8]

As shown in table 8, the average value of the spreading strength at 44cm of the spread width of each test piece produced in comparative example 1 was 2.6N in the M dimension and the Big dimension and 2.8N in the L dimension, whereas the average value of the spreading strength at 44cm of the spread width of each test piece produced in example 4 was 2.4N in the M dimension and the Big dimension and 2.5N in the L dimension. From the viewpoint of causing the 2 nd contraction portion in the waist gather to exert the slip suppression function of suppressing the slip of the diaper from the wearer, the widening strength of the 2 nd contraction portion is preferably 1.4N or more and 3.4N or less in the M dimension and the Big dimension, and 1.5N or more and 3.5N or less in the L dimension, and the widening strength of example 4 is included in the above-described adaptability range, and it was confirmed that the example can sufficiently exert the slip suppression function of the diaper.

< embodiment 3>

Next, the diaper of embodiment 3 will be explained. The diaper 1 of the present embodiment has the same components as those of the diaper of embodiment 1 described above. In the present embodiment, the same components as those in embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

The diaper 1 of the present embodiment is characterized in that "when worn, a space is formed between the center sheet 9 (an example of a" skin side sheet member ") and the skin of the wearer in the region overlapping the vicinity of the longitudinal end of the absorbent body 8. The center sheet 9 is a sheet member laminated on the absorbent body 8 to form a skin-facing surface.

Next, a configuration example of the space will be described with reference to fig. 12. Fig. 12 is a view schematically showing a state where the diaper 1 of embodiment 3 is unfolded and extended. Fig. 12 (a) schematically shows the internal structure of the diaper 1 in an unfolded and extended state as viewed from the left side. Fig. 12 (B) schematically shows a plan view of the diaper 1 in an unfolded and extended state.

The diaper 1 of the present embodiment is formed with fold lines 50F, 50R which are convex toward the end portions in the longitudinal direction in the region overlapping the vicinity of the end portions in the absorbent body 8 in a plan view. The folding lines 50F and 50R may be formed in the absorbent body 8 or in the center sheet 9. The bending lines 50F and 50R may be compressed grooves formed in the absorbent body 8 or the center sheet 9. In addition, the bending lines 50F and 50R may be formed by forming the central sheet 9 by 2 sheet members and embossing (3D embossing) the central sheet at the bonding portions of the 2 sheet members.

The diaper 1 can form a space between the center sheet 9 and the skin of the wearer so that the longitudinal end portions of the absorber 8 are bent by the bending lines 50F and 50R when worn. The diaper 1 can make the moisture from the absorbent body 8 absorbing the liquid flow into the 1 st air-permeable path 111 and the 2 nd air-permeable path 112 through the space, and effectively discharge the moisture to the outside. Thus, the diaper 1 of the present embodiment has good air permeability.

In the diaper 1, the above-mentioned space may be formed by bonding a string-shaped rubber in an extended state to the longitudinal end of the absorber 8.

< embodiment 4>

Next, the diaper of embodiment 4 will be explained.

When the absorbent article is worn, moisture generated from urine, body fluid, or the like absorbed in the absorbent body tends to accumulate in the internal space of the absorbent article (the space formed between the skin of the wearer and the skin contact surface of the absorbent article), and this moisture is not preferable because it causes skin problems such as skin rash, and causes an unpleasant feeling such as hot flashes and stickiness.

In order to discharge moisture accumulated in the internal space of the absorbent article to the outside when the absorbent article is worn, various proposals have been made to improve the air permeability of the absorbent article (for example, see japanese patent No. 5573806). For example, a disposable diaper is known in which an outer sheet and an inner sheet are contracted in the circumferential direction of a waist by elastic members to form gathers in the waist and moisture is discharged to the outside from gaps between the gathers and the skin of a wearer.

As described above, various proposals have been made to improve the air permeability of absorbent articles, but it is actually desired to provide absorbent articles having higher air permeability. Accordingly, one object of the present embodiment is to provide an absorbent article having better air permeability than the conventional ones.

In order to solve the above problem, an absorbent article according to the present embodiment is an absorbent article in which a front torso region covering an abdomen of a wearer, a rear torso region covering a back of the wearer, and a crotch region located between the front torso region and the rear torso region and in which an absorber is disposed are continuously provided, and includes: a trunk opening lower contraction portion that includes a plurality of stretchable members that are provided so as to extend in a trunk direction at least from a portion corresponding to a lumbar bone of a wearer at a trunk opening portion through which a trunk portion of the wearer can be inserted in the front and rear trunk regions, and that contracts the trunk opening portion in the trunk direction; and a trunk opening upper contraction part which includes a plurality of expansion members extending in the trunk direction between an opening end edge of the trunk opening and the trunk opening lower contraction part and contracts the trunk opening in the trunk direction, wherein the interval between the plurality of expansion members of the trunk opening lower contraction part is larger than the interval between the plurality of expansion members of the trunk opening upper contraction part.

The distance between the plurality of stretchable members provided in the lower contraction portion of the trunk opening may be 6.5mm to 12 mm.

The trunk opening lower contraction portion may be provided in a region including a distance of 20mm to 40mm from the opening end edge.

The ventilation path forming sheet may be joined to the skin-facing surface by a plurality of joining portions provided intermittently around the trunk in such a manner as to cover the skin-facing surface of the trunk opening upper contraction portion and the trunk opening lower contraction portion, and the non-joining region between the joining portions may be bent or deformed into a wave shape by contraction of the trunk opening upper contraction portion and the trunk opening lower contraction portion, thereby forming the ventilation path.

The trunk opening portion may be contracted in the trunk direction, and the open end edge side contracted portion may further include a plurality of stretchable members extending in the trunk direction along the opening end edge between the opening end edge and the trunk opening portion upper contracted portion, and the plurality of stretchable members included in the open end edge side contracted portion may be spaced apart from each other by a larger distance than the plurality of stretchable members included in the trunk opening portion upper contracted portion.

Further, the present invention may be configured to include a cover piece that encloses a stretchable member provided in the upper contraction part of the trunk opening in a portion forming the trunk opening, the cover piece being folded back at a portion at an end edge of the opening, and the fold at the folded-back portion having a continuous vent hole penetrating the cover piece.

With the absorbent article of the present embodiment, better air permeability can be obtained than in the conventional article.

Embodiment 4 of the present invention will be explained below. The embodiments described below are examples of the embodiments of the present invention, and the technical scope of the present invention is not limited to the embodiments described below.

Fig. 13 is a perspective view of a pants-type disposable diaper (hereinafter, simply referred to as "diaper") 1 according to embodiment 4. Fig. 14 is an exploded perspective view of the diaper 1 of embodiment 4. Fig. 15 is a view schematically showing a state where the diaper 1 of the embodiment is unfolded. Fig. 15(a) schematically shows the internal configuration in the case where the diaper 1 when developed is viewed from the left side. Fig. 15 (B) schematically shows the planar configuration of the diaper 1 when unfolded.

The term "direction" used in the present specification means a direction that coincides with the front, back, left, and right of a wearer in a state where the diaper 1 is worn on the wearer. For example, the term "left-right direction" in the present specification means a direction that coincides with the left and right of a wearer in a state where the diaper 1 is worn on the wearer.

In the present specification, the "front bodice area" of the diaper 1 means a portion that covers the abdomen (front of the body) of the wearer when the diaper 1 is worn on the wearer. The "crotch region" of the diaper 1 means a portion that covers the crotch of the wearer when the diaper 1 is worn on the wearer. The "back bodice area" of the diaper 1 means a portion that covers the back (body rear) of the wearer when the diaper 1 is worn by the wearer. In the present specification, the "longitudinal direction" means a direction connecting the front and rear bodices of the diaper 1. That is, the longitudinal direction of the diaper 1 coincides with the direction in which the front, crotch, and rear bodices are continuously provided. The "width direction" means a direction orthogonal to the longitudinal direction of the diaper 1.

In the present embodiment, as an example of an absorbent article, a pants-type disposable diaper having a tubular structure with an opening into which the abdominal circumference of a wearer enters and a pair of left and right openings through which the left and right lower limbs of the wearer are inserted is exemplified, but the "absorbent article" in the present specification is not limited to a pants-type disposable diaper. The "absorbent article" includes various forms of absorbent articles such as a belt-type disposable diaper having a tubular structure formed by attaching a belt fixed to the vicinity of one end of a sheet-like member covering the crotch (private part) of a wearer from the front torso region to the rear torso region to the vicinity of the other end of the sheet-like member, and capable of wrapping the abdominal circumference and the crotch.

As shown in fig. 13 to 15, the diaper 1 has a crotch region 1B covering the crotch (pudendum) of a wearer in a worn state, a front torso region 1F covering the abdomen of the wearer, and a rear torso region 1R covering the back of the wearer. The crotch region 1B is located between the front and back body regions 1F and 1R and is provided continuously with the front and back body regions 1F and 1R, and the crotch region 1B is provided with an absorbent portion main body 15 (absorbent body 8) that absorbs and retains liquid.

Since the diaper 1 in the present embodiment is a pants-type disposable diaper, the state shown in fig. 13 is formed by joining the left side edge of the front torso region 1F and the left side edge of the rear torso region 1R to each other and joining the right side edge of the front torso region 1F and the right side edge of the rear torso region 1R to each other. As shown in fig. 13, a trunk opening (waist opening) 2T is formed by the upper end edge of the front torso region 1F and the upper end edge of the rear torso region 1R. In the diaper 1, a left lower limb opening 2L is formed in the left side portion of the crotch region 1B where the above-described joining is not performed, and a right lower limb opening 2R is formed in the right side portion of the crotch region 1B. The left lower limb opening 2L and the right lower limb opening 2R are openings for inserting the legs of the wearer when the diaper 1 is worn.

When the diaper 1 is worn such that the left lower limb of the wearer is inserted through the left lower limb opening 2L, the right lower limb of the wearer is inserted through the right lower limb opening 2R, and the torso of the wearer enters (passes through) the torso opening 2T, the diaper is fixed to the body of the wearer in a state where the front torso region 1F contacts the abdomen of the wearer, the rear torso region 1R contacts the back side of the wearer, the crotch region 1B contacts the crotch of the wearer, and the left lower limb opening 2L and the right lower limb opening 2R surround the thighs of the wearer. By fixing the diaper 1 to the body of the wearer in this manner, standing walking can be achieved in a state where the diaper 1 is worn.

In the diaper 1, the absorbent body 8 capable of absorbing and retaining liquid is disposed mainly around the crotch region 1B. In addition, in order to suppress formation of a gap which becomes an outflow path of liquid between diaper 1 and the skin of the wearer, diaper 1 is provided with three-dimensional gather G1L, three-dimensional gather G1R, and waist gather G2 at left lower limb opening 2L, right lower limb opening 2R, and trunk opening 2T, respectively. The three-dimensional gathers G1L, G1R and the waist gather G2 are configured to be in close contact with the skin of the wearer by the elastic force of the string-like rubber, and thereby the excretory fluid discharged from the wearer can be absorbed in the absorbent part main body 15 (absorber 8) without leaking from the diaper 1.

As shown in fig. 14 and 15, the diaper 1 includes cover sheets 4F and 4R and a pad cover sheet 6, which form an outer surface when the diaper is worn on a wearer. The cover sheet 4F is a sheet member that mainly forms the outer surface of the front bodice area 1F of the diaper 1. The cushion cover sheet 6 is a sheet member mainly used for forming the outer surface of the crotch region 1B of the diaper 1. The cover sheet 4R is a sheet member for forming the outer surface of the back torso region 1R of the diaper 1.

The cover sheets 4F and 4R and the gasket sheet 6 are provided, for example, for reinforcement of the outer surface of the diaper 1 and improvement of the hand. The cover sheets 4F and 4R and the gasket sheet 6 may be formed of, for example, a nonwoven fabric made of a liquid-impermeable thermoplastic resin in order to suppress leakage of excrement. Examples of the liquid-impermeable thermoplastic resin include Polyethylene (PE), polypropylene (PP), and the like. In addition, many fine pores of about 0.1 to several μm may be formed in the liquid-impermeable sheet so as to exhibit liquid impermeability and moisture permeability.

The diaper 1 further includes an inner cover sheet 5F laminated on the skin-facing surface side of the cover sheet 4F and an inner cover sheet 5R laminated on the skin-facing surface side of the cover sheet 4R. In the present specification, the "skin-facing surface" means a surface that faces the skin of the wearer when the diaper 1 is worn by the wearer. As will be described in detail later, the inner cover sheet 5F is a sheet member that is bonded to the cover sheet 4F with a linear rubber as a linear stretchable member sandwiched between the sheet member and the cover sheet 4F. The inner cover piece 5F is a piece member having a shape and a size corresponding to the cover piece 4F except for a folded portion 4F5 and a lumbar region RW1 in the outer cover portion 4F10, which will be described later. The inner cover sheet 5R is a sheet member that is bonded to the cover sheet 4F with a linear rubber as a linear stretchable member sandwiched between the sheet member and the cover sheet 4R. The inner cover piece 5R is a sheet member having a shape and a size corresponding to the cover piece 4R except for a folded portion 4R5 and a lumbar region 1 RW1 in the outer cover portion 4R10, which will be described later.

The diaper 1 of the present embodiment includes an absorbent portion main body 15. The absorbent part main body 15 is held in a state of being laid between the front torso region 1F and the rear torso region 1R, is arranged in the crotch of the wearer when the diaper 1 is worn, and absorbs and holds liquid such as urine excreted by the wearer. As shown in fig. 14 and 15, the absorbent part main body 15 includes a cushion sheet 6, a back sheet 7, an absorbent body 8, a center sheet 9, side sheets 10L, 10R, and the like, and is integrally formed therewith.

The back sheet 7, the absorbent body 8, and the center sheet 9 are laminated in this order on the skin-facing surface of the mask sheet 6. The cushion sheet 6 is a sheet member having a rectangular plane having a length in the longitudinal direction from the front torso to the back torso of the wearer through the crotch, and a predetermined lateral width in the width direction perpendicular to the longitudinal direction. The back sheet 7, the absorbent body 8, and the center sheet 9 are sheet members each having a rectangular plane in the same manner as the pad cover sheet 6, and are stacked in this order with respect to the pad cover sheet 6, in the order of the back sheet 7, the absorbent body 8, and the center sheet 9, with the longitudinal direction thereof coinciding with the longitudinal direction of the pad cover sheet 6.

The absorbent body 8 is a member for absorbing liquid such as urine and holding the absorbed liquid. The absorber 8 is disposed between the liquid-impermeable back sheet 7 and the liquid-permeable center sheet 9. The absorbent body 8 may have a structure in which a particulate absorbent resin such as a hydrophilic super absorbent polymer having a crosslinked structure capable of absorbing and retaining water is retained in gaps between short fibers of cellulose-based fibers such as pulp fibers, rayon fibers, and cotton fibers, and short fibers obtained by hydrophilization treatment of synthetic fibers such as polyethylene, polypropylene, and polyethylene terephthalate. Thus, when the absorbent body 8 absorbs the liquid excreted from the wearer, the absorbent resin held in the gaps in the short fibers swells and the liquid can be held in the short fibers. The absorbent body 8 may have a single-layer structure composed of 1 sheet of mat, or may have a laminated structure in which a plurality of sheets of mats are stacked. The absorbent body 8 can have an appropriate shape according to the purpose. Examples of the shape of the absorbent body 8 include a rectangular shape, an hourglass shape in which the vicinity of the central portion is narrowed, and other various shapes.

The center sheet 9 is a sheet member that is in direct contact with the skin of the wearer's crotch and is used to transmit liquid such as urine to the absorbent body 8, and is stacked so as to cover the water absorption surface of the absorbent body 8. The center sheet 9 in the present embodiment is formed of a liquid-permeable material having high flexibility. Examples of the liquid-permeable material forming the center sheet 9 include woven cloth, nonwoven cloth, and porous film. The center sheet 9 may have hydrophilicity.

The back sheet 7 is a sheet member for suppressing leakage of the liquid that has passed through the center sheet 9 and absorbed in the absorbent body 8 to the outside of the diaper 1. Thus, the back sheet 7 is formed of a liquid-impermeable material. As the liquid-impermeable material forming the back sheet 7, a liquid-impermeable film made of polyethylene resin or the like can be exemplified. In addition, the back sheet 7 may be formed of a microporous polyethylene film formed with many fine pores in order to secure breathability.

The gasket sheet 6 is a member for reinforcing the back sheet 7 and making the skin feel good, and is attached to the back sheet 7. Examples of the material for forming the gasket sheet 6 include woven fabric and nonwoven fabric. The mat cover sheet 6 may be a nonwoven fabric or wet nonwoven fabric made of a thermoplastic resin such as polyethylene, polypropylene, or polyester.

The side sheets 10L and 10R in the absorbent portion main body 15 are elongated belt-like members for forming the above-described three-dimensional gathers G1L and G1R. The side sheets 10L and 10R extend along the long side portion of the center sheet 9. Linear rubbers 10L1, 10R1 are bonded to the side sheets 10L, 10R along the longitudinal direction. When the diaper 1 shown in fig. 13 is configured by joining the left edge 4F7 of the cover sheet 4F forming the left edge of the front bodice region 1F and the left edge 4R7 of the cover sheet 4R forming the left edge of the rear bodice region 1R to each other and joining the right edge 4F8 of the cover sheet 4F forming the right edge of the front bodice region 1F and the right edge 4R8 of the cover sheet 4R forming the right edge of the rear bodice region 1R to each other, the side sheets 10L, 10R are pulled in the longitudinal direction by the contractive force of the linear rubbers 10L1, 10R1, and as a result, rise from the center sheet 9 along the fold lines 10L2, 10R 2.

Thus, three-dimensional gathers G1L, G1R are formed that prevent liquid from flowing out of left lower limb opening 2L and right lower limb opening 2R. The method of joining the side edges of the cover sheets 4F and 4R to each other is not particularly limited, but examples thereof include heat sealing, high-frequency sealing, and ultrasonic sealing. Further, the absorbent portion main body 15 extends from the front torso region 1F to the rear torso region 1R.

Next, the detailed structure of the diaper 1 will be described. As shown in fig. 15, the cover sheet 4F is folded inward at the top end side with a fold line 4F6 as a boundary to form a fold 4F 5. Hereinafter, the portion of the cover piece 4F other than the folded portion 4F5 is referred to as an outer cover portion 4F 10. The outer covering portion 4F10 of the cover piece 4F forms the outer surface of the diaper 1. The fold line 4F6 of the cover sheet 4F forms a trunk opening end edge 4F9 of the trunk opening 2T in the assembled state of the diaper 1.

The 1 st linear rubber 4F1 in an extended state is disposed between the folded portion 4F5 of the cover piece 4F and the outer cover portion 4F 10. The tip end side of the folded portion 4F5 of the cover sheet 4F is bonded so as to overlap one end of the absorbent body 8 in a state where the inner cover sheet 5F, the pad cover sheet 6, the back sheet 7, and one end of the absorbent body 8 in the longitudinal direction are sandwiched between the layers of the outer cover portion 4F 10. In the present specification, the manner in which one member and another member are overlapped is not limited to the manner in which the members are overlapped in a state of being in full-face contact with each other, and is a concept including a manner in which a part of one member and the other member are entirely overlapped, a manner in which a part of one member and another member are overlapped with each other, or the like.

As shown in fig. 15, the 2 nd linear rubber 4F2, the 3 rd linear rubber 4F3, and the 4 th linear rubber 4F4 are disposed in this order between the outer covering portion 4F10 of the cover piece 4F and the inner covering piece 5F from the side of the fold line 4F6, and bonded in a state of being sandwiched between the outer covering portion 4F10 and the inner covering piece 5F. As shown in fig. 15, the 1 st to4 th linear rubbers 4F1 to 4F4 in the cover sheet 4F are arranged in parallel with each other and extend in the width direction (trunk direction) of the cover sheet 4F.

On the other hand, the cover sheet 4R is also folded inward at the top end side with the fold line 4R6 as a boundary to form a fold portion 4R 5. Hereinafter, the portion of the cover piece 4R other than the folded portion 4R5 is referred to as an outer cover portion 4R 10. The outer covering portion 4R10 of the cover piece 4R forms the outer surface of the diaper 1. The fold line 4R6 of the cover sheet 4R forms a trunk opening end edge 4R9 of the trunk opening 2T in the assembled state of the diaper 1. The 1 st linear rubber 4R1 in an extended state is disposed between the folded portion 4R5 of the cover piece 4R and the outer cover portion 4R 10. The cover sheet 4R is bonded so that the tip end side of the folded-over portion 4R5 is sandwiched between the inner cover sheet 5R, the pad cover sheet 6, the back sheet 7, and the other end side of the absorbent body 8 in the longitudinal direction and the outer cover portion 4R10, and is overlapped with the other end side of the absorbent body 8.

As shown in fig. 15, the 2 nd linear rubber 4R2, the 3 rd linear rubber 4F3, and the 4 th linear rubber 4R4 are arranged in this order from the side of the folding line 4R6 between the outer covering portion 4R10 of the cover piece 4R and the inner cover piece 5R, and bonded in a state sandwiched by the outer covering portion 4R10 and the inner cover piece 5R. As shown in fig. 15, the 1 st to4 th linear rubbers 4R1 to4 th linear rubbers 4R4 in the cover piece 4R are arranged in parallel and extend in the width direction (trunk direction) of the cover piece 4R.

Hereinafter, the region of the cover sheets 4F and 4R of the diaper 1 where the 1 st linear rubbers 4F1 and 4R1 and the 2 nd linear rubbers 4F2 and 4R2 are disposed is referred to as a "waist region RW". The waist region RW of the diaper 1 is a region located in the vicinity of the trunk opening end edges 4F9, 4R9 forming the trunk opening 2T and forming the waist gather G2. In the waist region RW, the region where the 1 st linear rubbers 4F1 and 4R1 are disposed is referred to as "waist 1 st region RW 1" (1 st region), and the region where the 2 nd linear rubbers 4F2 and 4R2 are disposed is referred to as "waist 2 nd region RW 2" (2 nd region).

In the cover sheets 4F and 4R of the diaper 1, the region in which the 3 rd linear rubbers 4F3 and 4R3 and the 4 th linear rubbers 4F4 and 4R4 are disposed is referred to as "abdominal region RT". The abdominal region RT is a region located below the lumbar region RW. The region in which the 3 rd linear rubbers 4F3 and 4R3 are disposed in the abdomen region RT is referred to as "abdomen 1 region RT 1", and the region in which the 4 th linear rubbers 4F4 and 4R4 are disposed is referred to as "abdomen 2 region RT 2".

Here, the 1 st linear rubbers 4F1 and 4R1 in the waist 1 st region RW1 are applied with an adhesive in an extended state, for example, during assembly of the diaper 1, and then sandwiched between the outer covering portions 4F10 and 4R10 and the folded-over portions 4F5 and 4R5, thereby adhering the layers therebetween. Similarly, the 2 nd linear rubbers 4F2 and 4R2 in the waist region RW2 and the 3 rd linear rubbers 4F3 and 4R3 and the 4 th linear rubbers 4F4 and 4R4 in the abdomen region RT are applied with an adhesive in an extended state, for example, during the assembly of the diaper 1, and then sandwiched between the outer covering portions 4F10 and 4R10 of the covering sheets 4F and 4R and the inner covering sheets 5F and 5R to be bonded between the layers thereof.

Here, when the 1 st linear rubbers 4F1, 4R1 of the waist portion 1 region RW1 sandwiched and bonded in an extended state between the outer covering portions 4F10, 4R10 of the cover pieces 4F, 4R and the inner covering pieces 5F, 5R contract, the portions corresponding to the waist portion 1 region RW1 in the outer covering portions 4F10, 4R10 and the folded-over portions 4F5, 4R5 follow this contraction, and the 1 st contracted portion S1 that contracts the waist portion 1 region RW1 in the trunk direction is formed.

In the lumbar region RW2 as well, when the 2 nd linear rubbers 4F2 and 4R2 sandwiched and bonded in an extended state between the outer cover portions 4F10 and 4R10 and the inner cover pieces 5F and 5R contract, the portions of the outer cover portions 4F10 and 4R10 and the inner cover pieces 5F and 5R corresponding to the lumbar region RW2 are continuously flexed in a pleated state following the contraction, and the 2 nd contracted portion S2 (an example of the "upper torso opening contracted portion" in the present application) that contracts the lumbar region RW2 in the trunk direction is formed.

In the present embodiment, the waist gather G2 is formed mainly by the 1 st contracted portion S1 formed in the waist 1 st region RW1 and the 2 nd contracted portion S2 formed in the waist 2 nd region RW 2. The waist gather G2 improves the fit of the diaper 1 around the waist of the wearer by the contractive force of the 1 st linear rubber 4F1, 4R1 and the 2 nd linear rubber 4F2, 4R 2. In the 1 st constricted portion S1 of the waist gather G2, a plurality of 1 st linear rubbers 4F1 and 4R1 are arranged in parallel with each other at a constant interval a 1. In the 2 nd constricted portion S2 of the waist gather G2, a plurality of 2 nd linear rubbers 4F2 and 4R2 are provided in parallel with each other at a constant interval a 2. The interval between the linear rubbers as referred to herein means a dimension in which the adjacent linear rubbers are separated from each other in the longitudinal direction of the diaper (direction connecting the large body region and the rear large body region).

In the present embodiment, the 1 st linear rubbers 4F1 and 4R1 of the waist portion 1-st region RW1 and the 2 nd linear rubbers 4F2 and 4R2 of the waist portion 2-st region RW2 extend over the entire width of the cover sheets 4F and 4R. Thus, after completion of the diaper 1, the 1 st linear rubbers 4F1, 4R1 and the 2 nd linear rubbers 4F2, 4R2 form a substantially annular stretchable member that is looped along the trunk opening 2T. In other words, after completion of the diaper 1, the waist gather G2 (the 1 st contracted part S1, the 2 nd contracted part S2) is formed over the entire circumference in the trunk direction.

In the abdomen-1 region RT1, when the 3 rd linear rubbers 4F3 and 4R3 sandwiched and bonded in an extended state between the outer covering portions 4F10 and 4R10 of the covering pieces 4F and 4R and the inner covering pieces 5F and 5R contract, the outer covering portions 4F10 and 4R10 of the covering pieces 4F and 4R and the portions of the inner covering pieces 5F and 5R corresponding to the abdomen-1 region RT1 continuously flex in a pleated state following the contraction of the 3 rd contracted portion S3 (an example of the "trunk opening lower contracted portion" in the present application) that contracts the abdomen-1 region RT1 in the trunk direction is formed. The 3 rd contracted portion S3 is a region that fits around the height of the waist bone of the wearer when the diaper 1 is worn, and is provided in a region that includes a distance of 20mm or more and 40mm or less from the opening edge of the trunk opening 2T.

In the abdomen area 2 RT2, when the 4 th linear rubbers 4F4 and 4R4 sandwiched and bonded in an extended state between the layers of the outer covering portions 4F10 and 4R10 and the inner covering pieces 5F and 5R of the covering pieces 4F and 4R contract, the outer covering portions 4F10 and 4R10 of the covering pieces 4F and 4R and the portions of the inner covering pieces 5F and 5R corresponding to the abdomen area 2 RT2 are continuously flexed in a pleated state following the contraction of the 4 th contracted portion S4 that contracts the abdomen area 2 RT2 in the trunk direction. In the present embodiment, the abdomen gather G3 is formed mainly by the 3 rd contracted portion S3 formed in the abdomen 1 st region RT1 and the 4 th contracted portion S4 formed in the abdomen 2 nd region RT 2. The abdomen gather G3 improves the fit of the diaper 1 around, for example, the lower abdomen of the wearer by the contractile force of the 3 rd linear rubbers 4F3 and 4R3 and the 4 th linear rubbers 4F4 and 4R 4.

The 3 rd linear rubbers 4F3 and 4R3 disposed in the 3 rd contracted portion S3 of the abdomen gather G3 are provided in parallel with each other at a constant interval A3. The 4 th linear rubbers 4F4 and 4R4 disposed in the 4 th contracted portion S4 of the abdomen gather G3 are also provided in parallel with each other at a constant interval a 4. In the present embodiment, the interval A3 between the 3 rd linear rubbers 4F3 and 4R3 in the 3 rd contracted part S3 of the abdomen gather G3 is set to be larger than the interval a2 between the 2 nd linear rubbers 4F2 and 4R2 in the 2 nd contracted part S2 of the waist gather G2, so that when the trunk opening 2T is widened and the diaper 1 is worn, the 3 rd contracted part S3 of the abdomen gather G3, which is a part in contact with the lumbar bones of the wearer, is easily widened relative to the 2 nd contracted part S2 of the waist gather G2.

In the present embodiment, the linear rubbers 4F1, 4R1, 4F2, 4R2, 4F3, 4R3, 4F4, and 4R4 are provided to extend in the width direction (the trunk direction) of the cover pieces 4F and 4R so as to form the 1 st to4 th constrictions S1 and S4, but the linear rubbers are not limited thereto, and other materials and forms may be used as long as they are linear expansion members. In the present specification, "linear" means a form elongated and extending in a specific direction, and is a concept including a strip-like or rectangular shape. Examples of the material of the linear rubber include natural rubber and synthetic rubber, but are not limited to a specific material.

Next, the air- passage forming sheets 11F and 11R of the diaper 1 will be described. As shown in fig. 14 and 15, the diaper 1 includes air passage forming sheets 11F and 11R which are arranged in a manner to overlap the fold-over portions 4F5 and 4R5 in the cover sheets 4F and 4R and the longitudinal end regions of the pad cover sheet 6, the center sheet 9, and the like in the absorbent portion main body 15 at the fold-over portions 4F5 and 4R 5. The air-permeable path-forming sheets 11F and 11R form skin-contacting surfaces of the waist gather G2 and the abdomen gather G3 of the diaper 1. The "skin contact surface" means a surface that is directly contacted with the skin of the wearer when the diaper 1 is worn, that is, the innermost surface of the diaper 1.

Fig. 16 is a diagram illustrating an installation manner of the air- passage forming sheets 11F and 11R of the diaper 1 according to the embodiment. Fig. 16(a) is a view showing a state where the 1 st contracted portion S1 of the waist gather G2 is viewed from the side of the inner space of the diaper 1. Fig. 16 (B) is a view schematically showing the internal structure of the 1 st contracted portion S1 of the waist gather G2 when viewed from the side of the diaper 1. Fig. 16 (C) is a view of the 1 st contracted portion S1 of the waist gather G2 looking at the top of the diaper 1 (i.e., in the viewing direction of a of (B)). For convenience, fig. 16(a) and (C) show the state of the 1 st contracted portion S1 before contraction in the waist gather G2. Fig. 16(D) is a view showing a state where the 1 st contracted portion S1 of the contracted waist gather G2 is viewed from above.

The air passage forming sheets 11F and 11R are disposed at least at the portions corresponding to the 1 st constricted portion S1, the 2 nd constricted portion S2, and the 3 rd constricted portion S3, and are joined to the lengthwise end regions and the folded-over portions 4F5 and 4R5 of the cushion cover sheet 6 via joining portions denoted by reference numeral S. Fig. 17 is a view showing the portions of the joining portions S joining the air-passage-forming sheets 11F, 11R. In the present embodiment, the joint S is formed by joining the folded portions 4F5 and 4R5 of the cover sheets 4F and 4R made of thermoplastic resin and the air- passage forming sheets 11F and 11R of the mat cover sheet 6, which are superposed on each other, by ultrasonic welding. As shown in fig. 16 a and 17, a plurality of seams S are intermittently arranged from the trunk opening end edges 4F9, 4R9 of the cover sheets 4F, 4R along the longitudinal direction orthogonal to the direction around the trunk (width direction), thereby forming linear seams SL extending in the longitudinal direction of the diaper 1. In other words, the 1 linear joint SL is an aggregate of a plurality of joints S intermittently arranged along the longitudinal direction of the diaper 1. Here, "intermittently" arranged means a non-continuous or intermittent arrangement.

As shown in fig. 16 a, a plurality of linear joints SL are intermittently arranged in the 1 st contracted portion S1 of the waist gather G2 along the direction (width direction) of the cover sheets 4F, 4R around the trunk. In the example shown in fig. 16(a), the linear bonding portions SL are arranged in parallel with each other, and the intervals between the linear bonding portions SL are set to alternate in size. That is, the linear joints SL are intermittently arranged in a state where two lines formed by 1 set of the linear joints SL are arranged at equal intervals around the trunk direction (width direction). In fig. 15(a), the range of the linear joint portion SL extending in the longitudinal direction of the diaper 1 is shown by hatching. As shown, the linear joint SL extends across the waist 1 st region RW1 forming the 1 st contracted portion S1 and the waist 2 nd region RW2 forming the 2 nd contracted portion S2.

The ultrasonic bonding of the air-permeable path-forming sheets 11F and 11R in the 1 st and 2 nd contracted portions S1 and S2 of the waist gather G2 and the 3 rd contracted portion S3 of the abdomen gather G3 is performed in a state where the 1 st and 2 nd linear rubbers 4F1 and 4R1 and 4F2 and 4R2 of the waist gather G2 and the 3 rd and 4 th linear rubbers 4F3 and 4R3 and 4F4 and 4R4 of the abdomen gather G3 are in an extended state. After the joining of the air-permeable path-forming sheets 11F and 11R in the 1 st and 2 nd contracted portions S1 and S2 of the waist gather G2 and the 3 rd and 3 rd contracted portions S3 of the abdomen gather G3 is completed, the stretched state of the 1 st, 2 nd, 4R, 4F1 and 4R1, 2 nd, 4F2 and 4R2, 3 rd, 4F3 and 4R3, and 4 th, 4F4 and 4R4 sandwiched and fixed between the sheets is released. As a result, the waist gather G2 and the abdomen gather G3 contract, and the interval between the linear joint portions SL in the air-permeable path-forming sheets 11F and 11R becomes narrow. Thus, the non-joined region 110 between the linear joint portions SL in the air passage forming sheets 11F and 11R is deformed into a wavy shape by bending.

As a result, the non-joined regions 110 located between the linear joint portions SL are separated, and the 1 st air-permeable passage 111 surrounded by the folded portions 4F5, 4R5, etc. and the non-joined regions 110 of the air-passage-forming sheets 11F, 11R is formed as shown in fig. 16 (D). Further, the 2 nd air passage 112 is formed on the skin contact surface 11a side of the air passage formation sheets 11F, 11R. The two-dot chain line indicated by reference numeral SS in fig. 16(D) shows the skin surface in contact with the air passage forming sheets 11F, 11R when the diaper 1 is worn by the wearer as a virtual line. The 2 nd air passage 112 is formed as a gap formed between the skin contact surface 11a of the air passage forming sheets 11F, 11R and the skin of the wearer when the wearer wears the diaper 1. Moisture in the internal space of the diaper 1 can be discharged to the outside through the 1 st and 2 nd air permeation passages 111, 112 formed in the 1 st and 2 nd contracted portions S1, S2 of the waist gather G2 and the 3 rd and 3 rd contracted portions S3 of the abdomen gather G3. The 1 st air permeation path 111 is an air permeation path through which moisture permeating the air permeation path formation sheets 11F and 11R from the inner space of the diaper 1 passes. On the other hand, the 2 nd air-permeable passage 112 is an air-permeable path that directly communicates the internal space and the external space of the diaper 1, and can discharge moisture in the diaper 1 more smoothly.

As shown in fig. 16(D), after contraction of the waist gather G2 and the abdomen gather G3, the relatively large 1 st fold 41 and the relatively small 2 nd fold 42 forming the 1 st contracted portion S1 are alternately formed. In addition, the air passage-forming sheets 11F, 11R, which are flexed into a wave shape, are also alternately formed with relatively large 1 st pleats 113 and relatively small 2 nd pleats 114. This is because the intervals between the linear bonding portions SL are set to alternate in size. That is, the large 1 st pleats 41, 113 are formed by the pair of linear joint portions SL having wide intervals, and the small 2 nd pleats 42, 114 are formed by the pair of linear joint portions SL having narrow intervals.

Here, the 1 st fold 113 of the air passage-forming sheets 11F, 11R that are flexed into a wave shape functions to secure the large 1 st air permeation passage 111 in cooperation with the 1 st fold 41 forming the 1 st constricted portion S1. On the other hand, the 2 nd pleats 114 of the air passage forming sheets 11F, 11R function to form the 1 st air permeable passage 111 in cooperation with the 2 nd pleats 42 forming the 1 st constricted parts S1 and to ensure an air permeable cross section of the 2 nd air permeable passage 112 by appropriately separating the 1 st pleats 113 adjacent in the trunk direction (width direction) from each other. In the present embodiment, by providing the grooved structure formed by the air- passage forming sheets 11F and 11R that are deformed into a wave shape following the contraction of the waist gather G2 and the abdomen gather G3 on the skin contact surface side of the 1 st and 2 nd contracted portions S1 and S2 of the waist gather G2 and the 3 rd and contracted portions S3 of the abdomen gather G3, moisture in the diaper 1 can be effectively discharged to the outside through the 1 st and 2 nd air- permeable paths 111 and 112. In the present embodiment, since the linear joints SL are formed as an aggregate of a plurality of joints S intermittently arranged along the longitudinal direction of the diaper 1, the 1 st air-permeable paths 111 adjacent to each other communicate with each other through the gaps between the joints S. Therefore, the air permeability between the adjacent 1 st air permeation paths 111 can be improved, and the wearer can be less likely to be locally affected by moist heat.

The air-passage-forming sheets 11F and 11R in the present embodiment are provided with a large number of fine air-permeable sheetsThe air vents 11F1 and 11R 1. Here, the air-permeable hole means an opening portion that communicates a space on one surface side and a space on the other surface side of the sheet, and the shape thereof is not particularly limited. Thus, the openings having a shape such as a circle, an ellipse, or a polygon (triangle, quadrangle, etc.) can be applied as the ventilation holes 11F1 and 11R 1. The formation of the permeable holes 11F1 and 11R1 in the air-passage-forming sheets 11F and 11R does not mean that the air-passage-forming sheets 11F and 11R are made of a material having no air permeability, and the air-passage-forming sheets 11F and 11R may be made of a material having air permeability or a material having no air permeability. The air-permeable path-forming sheets 11F and 11R are preferably air-permeable and liquid-permeable materials, but may be non-air-permeable materials, for example. The size and number of the vent holes 11F1 and 11R1 are not particularly limited, but for example, the opening area is 0.5 to 10mm²Preferably, about 5 to 200 holes are formed.

Further, the present inventors have made intensive studies and as a result have found that: by making the interval A3 between the 3 rd linear rubbers 4F3 and 4R3 forming the 3 rd contracted part S3 larger than the interval a2 between the 2 nd linear rubbers 4F2 and 4R2 forming the 2 nd contracted part S2, the pump effect accompanying the deformation due to the expansion and contraction of the 1 st air permeation passage 111 and the 2 nd air permeation passage 112 in the 3 rd contracted part S3 which guides the 3 rd contracted part S3 to the lumbar bones of the wearer and expands and contracts in accordance with the movement of the wearer promotes the discharge of moisture from the inside of the diaper 1 so that the diaper 1 is in an appropriate worn state. In particular, the following insights were obtained: by setting the interval A3 to 6.5mm or more and 12mm or less, the degree of restraint of the air passage forming pieces 11F and 11R by the 3 rd linear rubbers 4F3 and 4R3 is reduced as compared with the case where the interval A3 is set to a narrower interval than that, and the pump effect in the 3 rd constricted portion S3 is increased as the 1 st air passage 111 and the 2 nd air passage 112 become larger due to the reduction in the degree of restraint.

Fig. 18 is a graph showing the magnitude of the contraction force in each contraction portion. The hollow arrows shown in fig. 18 indicate the magnitude of the contraction force. In the diaper 1 of the present embodiment, the interval A3 between the 3 rd linear rubbers 4F3 and 4R3 forming the 3 rd contracted part S3 is larger than the interval a2 between the 2 nd linear rubbers 4F2 and 4R2 forming the 2 nd contracted part S2. Thus, in the diaper 1 of the present embodiment, as shown in fig. 18, the contraction force of the 3 rd contraction part S3 is weaker than the contraction force of the 1 st contraction part S1 and the 2 nd contraction part S2. The 3 rd contracted portion S3 is designed to abut against the waistline of the wearer when the diaper 1 is worn in an appropriate position, and as shown in fig. 18, the waistline is the portion having the largest width at the waist of the wearer (japanese: hou り). The 3 rd constricted part S3 is provided in a region that includes a distance of 20mm to 40mm from the opening edge of the trunk opening 2T so as to coincide with a distance from the 1 st joint and the 2 nd joint of the index finger of a typical adult to the tip end, that is, in a range of 20mm to 40 mm. Therefore, in the diaper 1 of the present embodiment in which the contraction force of the 3 rd contraction part S3 is weaker than the contraction forces of the 1 st contraction part S1 and the 2 nd contraction part S2, when the trunk opening 2T is spread by the hand when worn by the wearer, the 3 rd contraction part S3 is most spread, and therefore, the following state is achieved: the 2 nd joint of the index finger of the person who performs the wearing work is hooked near the opening end edge of the trunk opening 2T, the 1 st constriction S1 and the 2 nd constriction S2 are located between the 1 st joint and the 2 nd joint of the index finger, and the tip of the index finger is hooked on the 3 rd constriction S3 which is more easily expanded than the 1 st constriction S1 and the 2 nd constriction S2. Then, the wearer wears the 3 rd contracted portion S3 so that the lumbar rib having the largest lateral width at the waist of the wearer is naturally accommodated therein. As a result, the 3 rd contracted portion S3 is designed so that the diaper 1 in contact with the lumbar bone of the wearer is worn at an appropriate position toward the wearer.

Fig. 19 is a view illustrating the pleats formed in the 2 nd contraction part S2 of the waist gather G2 and the 3 rd contraction part S3 of the abdomen gather G3. In the pleats formed between the linear rubbers, the closer the distance from the linear rubber, the higher the degree of restriction by the linear rubber. Thus, the 1 st pleats 113 and the 2 nd pleats 114 of the air passage forming sheets 11F and 11R formed between the 3 rd linear rubbers 4F3 and 4R3 are not restrained from being restrained by the 1 st pleats 113 and the 2 nd pleats 114 of the air passage forming sheets 11F and 11R formed between the 2 nd linear rubbers 4F2 and 4R2 arranged in parallel at the interval a2 narrower than the interval A3 between the 3 rd linear rubbers 4F3 and 4R 3. Thus, the pleats of the 3 rd contracted portion S3 formed in the abdomen gather G3 are larger than the pleats of the 2 nd contracted portion S2 formed in the waist gather G2. Therefore, according to the diaper 1 of the present embodiment, the 1 st air-permeable passage 111 and the 2 nd air-permeable passage 112 formed by the 1 st fold 113 and the 2 nd fold 114 in the portion of the abdomen gather G3 are larger in size than the other portions. Further, since the abdomen gather G3 is a portion which expands and contracts by the action of the wearer, the 1 st air passage 111 and the 2 nd air passage 112 formed in the portion of the abdomen gather G3 expand and contract in conjunction with the action of the wearer to function as a pump, and thereby more smoothly discharge moisture in the diaper 1. Further, since the waist bone portion of the wearer is a portion having the largest width at the waistline of the wearer and is also a portion to which an external pressure is applied by being easily contacted by an object around the wearer, a pump effect in which the 1 st air permeation path 111 and the 2 nd air permeation path 112 are expanded and contracted by the external pressure can be expected in the abdomen gather G3 corresponding to the waist bone portion. This makes it possible to provide a more comfortable environment for the internal space of the diaper 1.

In addition, according to the diaper 1 of the present embodiment, since the pleats formed in the portion of the abdomen gather G3 are larger than the pleats formed in the 2 nd contracted portion S2 of the waist gather G2, the pleats in the portion of the abdomen gather G3 are more conspicuous than the other pleats, and the wearer can naturally be made aware of bringing the abdomen gather G3 into contact with the waistline having the largest lateral width at the waistline of the wearer. Further, since the pleats of the portion formed in the abdomen gather G3 are larger than the pleats of the 2 nd contraction part S2 formed in the waist gather G2, the portion of the abdomen gather G3 is easily expanded when the trunk opening portion 2T is expanded. Therefore, when the diaper 1 is worn, the diaper 1 is easily and naturally aligned so that the portion of the abdomen gather G3, which is relatively easily spread, comes into contact with the lumbar bones.

The diaper 1 of the above embodiment may be modified as follows, for example. Fig. 20 is a view schematically showing a state where the diaper 1 of the modified example is unfolded. In the present modification, the interval a1 between the 1 st linear rubbers 4F1 and 4R1 in the 1 st contracted part S1 is set to be larger than the interval a2 between the 2 nd linear rubbers 4F2 and 4R2 in the 2 nd contracted part S2, and thus the 1 st contracted part S1 has a moisture discharge function of discharging moisture in the inner space of the diaper 1 to the outside and a function of easily expanding the trunk opening 2T. On the other hand, the 2 nd contraction part S2 of the waist gather G2 has a position holding function (slip suppressing function) of suppressing slipping-off when the diaper 1 is worn by increasing the contraction force in the trunk direction as compared with the 1 st contraction part S1.

Fig. 21 is a view illustrating the gathers of the 1 st and 2 nd contractive portions S1 and S2 formed in the waist gather G2 and the 3 rd contractive portion S3 formed in the abdomen gather G3. As described above, in the pleats formed between the linear rubbers, the closer the distance from the linear rubber, the higher the degree of restriction by the linear rubber. Thus, the 1 st pleats 113 and the 2 nd pleats 114 of the air passage forming sheets 11F and 11R formed between the 1 st linear rubbers 4F1 and 4R1 are not restrained from being restrained by the 1 st pleats 113 and the 2 nd pleats 114 of the air passage forming sheets 11F and 11R formed between the 2 nd linear rubbers 4F2 and 4R2 arranged in parallel at the interval a2 narrower than the interval a1 between the 1 st linear rubbers 4F1 and 4R 1. Thus, the pleats of the 1 st contracted portion S1 formed in the waist gather G2 are larger than the pleats of the 2 nd contracted portion S2 formed in the waist gather G2. Therefore, according to the diaper 1 of the present modification, the 1 st and 2 nd air- permeable paths 111 and 112 formed of the 1 st and 2 nd pleats 113 and 114 in the 1 st contracted portion S1 of the waist gather G2 are larger in size than the 2 nd contracted portion S2. Further, since the waist gather G2 is a portion which expands and contracts by the action of the wearer, the pump function is exerted in each of the 1 st air passage 111 and the 2 nd air passage 112 at 2, which is the 1 st contracted portion S1 portion and the abdomen gather G3 portion of the waist gather G2, and the moisture in the diaper 1 is more smoothly discharged (double pump function). This makes it possible to provide a more comfortable environment for the internal space of the diaper 1.

The diaper 1 may be formed with ventilation holes formed by thin slits cut in a straight line in a broken line shape in parallel with the fold lines 4F6 and 4R6 of the cover sheets 4F and 4R. In this case, the dotted ventilation holes formed in the folding lines 4F6 and 4R6 are preferably sized so as not to allow the fingers of the wearer to enter. For example, if the ventilation holes are formed by slits having a length of 5mm or less, fingers of a typical infant do not enter the ventilation holes. The fold lines 4F6 and 4R6 preferably have a predetermined distance between slits forming the dotted ventilation holes so that the cover sheets 4F and 4R do not come apart at the fold lines 4F6 and 4R6 in the normal use state of the diaper 1. Although it is also contemplated to constitute a maskThe material of 4F or 4R has a strength of 8 to 50g/m in weight in square meter (Japanese: basis weight) so long as it does not impair stretchability and wearing feeling required for the waist²The distance between the slits of the left and right pieces is preferably 2mm or more.

Fig. 22 is a view showing the ventilation holes formed at the opening end edges of the trunk opening 2T when the waist gather G2 is contracted. In fig. 22, a part of the cover sheet 4F is shown, but the same is true for the cover sheet 4R. In the diaper 1 of the present modification, the fold lines 4F6, 4R6 of the cover sheets 4F, 4R are the ventilation holes in the shape of broken lines formed by the thin slits cut linearly, and therefore, when the waist gather 3R is contracted by the contraction force of the linear rubbers 4F1, 4F2, the thin slits forming the fold lines 4F6, 4R6 are expanded, and the ventilation holes 4F6K in the portions other than the joint 4F6T between the slits are expanded. Thus, in the diaper 1 of the present modification, not only the air-permeable paths (spaces shown by halftone in fig. 22) formed between the air-permeable path-forming sheets 11F and 11R and the cover sheets 4F and 4R, but also the air-permeable paths (spaces shown by hatching in fig. 22) formed in the cover sheets 4F and 4R by folding the cover sheets 4F and 4R around the folding lines 4F6 and 4R6 are formed. Thus, the diaper 1 of the present embodiment has higher air permeability in the waist gather 3R than a diaper having no vent holes 4F6K formed in the portions of the fold lines 4F6 and 4R 6. In particular, when the diaper is combined with the mode having the double pump function shown as the above modified example (i.e., the mode in which the pump function is exerted at 2 of the 1 st contracted portion S1 and the abdomen gather G3 of the waist gather G2, respectively), the ventilation through the ventilation holes 4F6K is also added, and the moisture in the diaper 1 can be discharged more smoothly. This makes it possible to provide a more comfortable environment for the internal space of the diaper 1.

Further, although the air passage forming sheets 11F and 11R are provided in the diaper 1 of the above embodiment, the air passage forming sheets 11F and 11R may be omitted. If the air passage forming sheets 11F and 11R are omitted, the 1 st air passage 111 and the 2 nd air passage 112 disappear, but the degree of restraint of the 3 rd linear rubbers 4F3 and 4R3 is maintained to be low, so that the state in which the size of the pleats formed in the 3 rd constricted portion S3 is larger than the surrounding area is maintained, and the pump effect of the 3 rd constricted portion S3 can be maintained as in the above-described embodiment.

Description of the reference numerals

1. diaper

1B · crotch region

1F. anterior greater region

1R · posterior greater region

2 T.torso opening

G2. waist gather

4F, 4R cover sheet

4F1, 4R 1. 1 st linear rubber

4F2, 4R 2. 2 nd linear rubber

4F3, 4R 3. rd Linear rubber

4F4, 4R 4. 4 th linear rubber

11F, 11R. air-permeable path forming sheet

S.junction

S1. No. 1 constriction

S2. No. 2 constriction

S3. No. 3 constriction

S4. No. 4 contraction part

Claims (28)

1. An absorbent article in which a front torso region covering the abdomen of a wearer, a rear torso region covering the back of the wearer, and a crotch region located between the front torso region and the rear torso region and in which an absorber is disposed are continuously provided,

a1 st contraction part which is provided in the front and rear main body regions, includes a1 st expansion member provided in a1 st region close to a trunk opening end edge forming a trunk opening through which a trunk of a wearer can be inserted, and extends in a trunk direction, and contracts the trunk opening in the trunk direction,

the 1 st contracting portion is provided with a plurality of 1 st telescopic members at a constant interval, and the interval between the 1 st telescopic members is 6.5mm to 20 mm.

2. The absorbent article as set forth in claim 1,

the interval between the 1 st telescopic members is more than 6.5mm and less than 13 mm.

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

the 1 st constriction extends in a longitudinal direction connecting the front and rear main bodies in a range of 26mm to 31mm from the open end edge of the trunk.

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

the 1 st constriction has a laminated structure in which at least 3 layers of sheet members are laminated.

5. The absorbent article according to any one of claims 1 to4,

a2 nd contraction part which is provided in the 2 nd region adjacent to the 1 st region in the crotch region side out of the front and rear bodices and which includes a2 nd expansion member extending in a trunk-surrounding direction and contracts the trunk opening part in the trunk-surrounding direction,

a plurality of the 2 nd telescopic members are disposed in the 2 nd contracting portion, and the interval between the 2 nd telescopic members is set to a size smaller than the interval between the 1 st telescopic members.

6. An absorbent article in which a front torso region covering an abdomen of a wearer, a rear torso region covering a back of the wearer, and a crotch region located between the front torso region and the rear torso region and in which an absorber is disposed are continuously provided, the absorbent article comprising:

a1 st contracting portion that includes a1 st stretchable member that is provided in a1 st region of the front and rear trunk regions, the 1 st region being close to a trunk opening end edge forming a trunk opening through which a trunk of a wearer can be inserted, and that extends in a trunk-surrounding direction, and that contracts the trunk opening portion in the trunk-surrounding direction; and

an air passage forming sheet which is disposed in a layered manner so as to cover at least a part of the skin-facing surface of the 1 st constricted part,

the air passage forming sheet is joined to the skin-facing surface of the 1 st contraction portion by a plurality of joining portions intermittently provided around the trunk, and by contraction of the 1 st contraction portion, non-joined regions between the joining portions are bent and deformed into a wave shape to form air passage,

the 1 st contracting portion is provided with a plurality of 1 st telescopic members at a constant interval, and the interval between the 1 st telescopic members is 6.5mm to 20 mm.

7. The absorbent article as set forth in claim 6,

the interval between the 1 st telescopic members is more than 6.5mm and less than 13 mm.

8. The absorbent article according to claim 6 or 7,

the 1 st constriction extends in a longitudinal direction connecting the front and rear main bodies in a range of 26mm to 31mm from the open end edge of the trunk.

9. The absorbent article according to any one of claims 6 to 8,

the 1 st constriction has a laminated structure in which at least 3 layers of sheet members are laminated.

10. The absorbent article according to any one of claims 6 to 9,

a2 nd contraction part which is provided in the 2 nd region adjacent to the 1 st region in the crotch region side out of the front and rear bodices and which includes a2 nd expansion member extending in a trunk-surrounding direction and contracts the trunk opening part in the trunk-surrounding direction,

a plurality of the 2 nd telescopic members are disposed in the 2 nd contracting portion, and the interval between the 2 nd telescopic members is set to a size smaller than the interval between the 1 st telescopic members.

11. An absorbent article in which a front torso region covering an abdomen of a wearer, a rear torso region covering a back of the wearer, and a crotch region located between the front torso region and the rear torso region and in which an absorber is disposed are continuously provided, the absorbent article comprising:

a1 st contracting portion that includes a1 st stretchable member that is provided in a1 st region of the front and rear trunk regions, the 1 st region being close to a trunk opening end edge forming a trunk opening through which a trunk of a wearer can be inserted, and that extends in a trunk-surrounding direction, and that contracts the trunk opening portion in the trunk-surrounding direction; and

a2 nd contraction part including a2 nd expansion member provided in a2 nd region adjacent to the 1 st region on the crotch region side out of the front and rear bodices and extending in a trunk direction, and contracting the trunk opening part in the trunk direction,

the 1 st telescoping member is bonded to the sheet member forming the 1 st constriction,

a plurality of the 1 st extensible members are arranged at a constant interval in the 1 st contracting portion, and the interval between the 1 st extensible members is 6.5mm to 20mm,

the 1 st constriction part extends from the open end edge of the trunk in a longitudinal direction connecting the front and rear bodices in a range of 26mm to 31mm,

a plurality of the 2 nd telescopic members are arranged in the 2 nd contraction part, and the interval between the 2 nd telescopic members is set to be smaller than the interval between the 1 st telescopic members,

the longitudinal end of the absorbent body is in contact with the 1 st contracted portion.

12. The absorbent article as set forth in claim 11,

the stiffness of the 2 nd constriction is greater than the stiffness of the 1 st constriction.

13. An absorbent article in which a front torso region covering an abdomen of a wearer, a rear torso region covering a back of the wearer, and a crotch region located between the front torso region and the rear torso region and in which an absorber is disposed are continuously provided, the absorbent article comprising:

a1 st contracting portion that includes a1 st stretchable member that is provided in a1 st region of the front and rear trunk regions, the 1 st region being close to a trunk opening end edge forming a trunk opening through which a trunk of a wearer can be inserted, and that extends in a trunk-surrounding direction, and that contracts the trunk opening portion in the trunk-surrounding direction;

a2 nd contraction unit that includes a2 nd expansion member that is provided in a2 nd region adjacent to the 1 st region on the crotch region side out of the front and rear bodices and that is provided so as to extend in a trunk direction, and that contracts the trunk opening in the trunk direction; and

a skin-side sheet member laminated on the absorbent body to form a skin-facing surface,

the 1 st telescoping member is bonded to the sheet member forming the 1 st constriction,

a plurality of the 1 st extensible members are arranged at a constant interval in the 1 st contracting portion, and the interval between the 1 st extensible members is 6.5mm to 20mm,

the 1 st constriction part extends from the open end edge of the trunk in a longitudinal direction connecting the front and rear bodices in a range of 26mm to 31mm,

a plurality of the 2 nd telescopic members are arranged in the 2 nd contraction part, and the interval between the 2 nd telescopic members is set to be smaller than the interval between the 1 st telescopic members,

when worn, a space is formed between the skin side sheet member and the skin of the wearer in a region overlapping the vicinity of the longitudinal end of the absorbent body.

14. The absorbent article as set forth in claim 13,

a bending line which is convex toward the longitudinal end in a region overlapping the vicinity of the longitudinal end of the absorbent body in a plan view is formed in the absorbent body.

15. The absorbent article as set forth in claim 13,

a fold line which is convex toward the longitudinal end in the vicinity of the longitudinal end of the absorbent body in a plan view is formed in the skin side sheet member.

16. The absorbent article according to any one of claims 11 to 15,

the interval between the 1 st telescopic members is more than 6.5mm and less than 13 mm.

17. The absorbent article according to any one of claims 11 to 16,

the 1 st constriction has a laminated structure in which at least 3 layers of sheet members are laminated.

18. An absorbent article in which a front torso region covering an abdomen of a wearer, a rear torso region covering a back of the wearer, and a crotch region located between the front torso region and the rear torso region and in which an absorber is disposed are continuously provided, the absorbent article comprising:

a1 st contracting portion that includes a1 st stretchable member that is provided in a1 st region of the front and rear trunk regions, the 1 st region being close to a trunk opening end edge forming a trunk opening through which a trunk of a wearer can be inserted, and that extends in a trunk-surrounding direction, and that contracts the trunk opening portion in the trunk-surrounding direction;

an air passage forming sheet laminated and arranged on a sheet member forming the 1 st constricted part so as to cover at least a part of the skin-facing surface of the 1 st constricted part; and

a2 nd contraction part including a2 nd expansion member provided in a2 nd region adjacent to the 1 st region on the crotch region side out of the front and rear bodices and extending in a trunk direction, and contracting the trunk opening part in the trunk direction,

the 1 st telescoping member is bonded to the sheet member,

the air passage forming sheet is joined to the skin-facing surface of the 1 st contraction portion by a plurality of joining portions intermittently provided around the trunk, and by contraction of the 1 st contraction portion, non-joined regions between the joining portions are bent and deformed into a wave shape to form air passage,

a plurality of the 1 st extensible members are arranged at a constant interval in the 1 st contracting portion, and the interval between the 1 st extensible members is 6.5mm to 20mm,

the 1 st constriction part extends from the open end edge of the trunk in a longitudinal direction connecting the front and rear bodices in a range of 26mm to 31mm,

a plurality of the 2 nd telescopic members are arranged in the 2 nd contraction part, and the interval between the 2 nd telescopic members is set to be smaller than the interval between the 1 st telescopic members,

the range of the 2 nd contraction part extending in the longitudinal direction from the open end edge of the trunk is 31mm to 71mm,

the 1 st constriction has a lower widening strength than the 2 nd constriction.

19. The absorbent article as set forth in claim 18,

the 2 nd contraction portion corresponds to a pelvis abutment position that abuts against a pelvis of the wearer.

20. The absorbent article according to claim 18 or 19,

the interval between the 1 st telescopic members is more than 6.5mm and less than 13 mm.

21. The absorbent article according to any one of claims 18 to 20,

the interval between the 2 nd telescopic members is set to be smaller than the interval between the 1 st telescopic members.

22. The absorbent article according to any one of claims 18 to 21,

the 1 st constriction has a laminated structure in which at least 3 layers of sheet members are laminated.

23. An absorbent article in which a front torso region covering an abdomen of a wearer, a rear torso region covering a back of the wearer, and a crotch region located between the front torso region and the rear torso region and in which an absorber is disposed are continuously provided, the absorbent article comprising:

a trunk opening lower contraction portion that includes a plurality of stretchable members that are provided so as to extend in a trunk direction from at least a portion corresponding to a lumbar bone of a wearer at a trunk opening portion through which a trunk portion of the wearer can be inserted in the front and rear bodices, and that contracts the trunk opening portion in the trunk direction; and

a trunk opening upper contraction part including a plurality of stretchable members extending in a trunk direction between an opening end edge of the trunk opening and the trunk opening lower contraction part, and contracting the trunk opening in the trunk direction,

the distance between the plurality of stretchable members provided in the lower torso-opening contractible portion is larger than the distance between the plurality of stretchable members provided in the upper torso-opening contractible portion.

24. The absorbent article as set forth in claim 23,

the distance between the plurality of telescopic members provided in the lower contraction part of the trunk opening is 6.5mm to 12 mm.

25. The absorbent article of claim 23 or 24,

the trunk opening lower contraction portion is provided in a region including a distance of 20mm to 40mm from the opening end edge.

26. The absorbent article according to any one of claims 23 to 25,

further comprises an air passage forming sheet which is stacked and arranged to cover the skin-facing surface of the upper contraction part of the trunk opening and the lower contraction part of the trunk opening,

the air passage forming sheet is joined to the skin-facing surface by a plurality of joining portions intermittently provided around the trunk, and non-joining regions between the joining portions are bent and deformed into a wave shape by contraction of the trunk opening upper contraction portion and the trunk opening lower contraction portion, thereby forming air passages.

27. The absorbent article according to any one of claims 23 to 26,

and an opening end edge side contracting portion which includes a plurality of stretchable members extending in the trunk direction along the opening end edge between the opening end edge and the trunk opening upper contracting portion and contracts the trunk opening in the trunk direction,

the distance between the plurality of stretchable members provided in the opening end edge side contracted portion is larger than the distance between the plurality of stretchable members provided in the trunk opening side contracted portion.

28. The absorbent article according to any one of claims 23 to 27,

comprises a cover sheet for enclosing the telescopic member of the upper contraction part of the trunk opening in the part forming the trunk opening,

the cover sheet is folded at the end edge of the opening part, and the folding line of the folded part is provided with continuous air holes penetrating through the cover sheet.

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