CN109982676B

CN109982676B - Disposable diaper having a disposable diaper

Info

Publication number: CN109982676B
Application number: CN201680090984.4A
Authority: CN
Inventors: 一万田俊明; 植田章之
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2016-12-12
Filing date: 2016-12-12
Publication date: 2021-06-22
Anticipated expiration: 2036-12-12
Also published as: WO2018109812A1; TWI763752B; TW201828907A; JPWO2018109812A1; RU2716892C1; CN109982676A; JP6847126B2

Abstract

In a disposable diaper of the present invention, a side sheet (3) is bonded to an outer composite sheet (22) and a skin side sheet (20) disposed on the inner surface side of the side sheet (3) via a bonding adhesive layer. The connecting adhesive layer (62) bonds the side sheet (3) and the outer composite sheet (22) at a position outside the inner edge (3c) of the side sheet (3) in the width direction of the disposable diaper, and bonds the outer composite sheet (22) and the topsheet (21) at a position inside the inner edge (3c) of the side sheet (3). The outer layer adhesive layer (61) has a discontinuous section (7) where no adhesive is disposed at a position overlapping the inner edge (3c) of the side sheet (3) in the thickness direction (Z) of the disposable diaper.

Description

Disposable diaper having a disposable diaper

Technical Field

The present invention relates to a disposable diaper.

Background

Conventionally, there is known an open-type disposable diaper in which a portion of an absorbent main body including an absorbent body, which is disposed on the back side of a wearer when worn, is attached to an extensible side sheet that is extensible in the width direction of the absorbent main body. In such a disposable diaper, since the fastening tape or the like provided at the front end portion of the side sheet is pulled to wear the diaper, in terms of the strength of the joint portion between the side sheet and the absorbent main body, it has been proposed to study the structure of the joint portion.

For example, the present applicant has previously proposed a disposable diaper in which a side sheet has 2 sheets and an elastic member fixed between the 2 sheets, a hook and loop fastener is provided at a distal end portion, the outer layer composite sheet has a leakproof sheet and an outer layer nonwoven fabric bonded to an outer surface side of the leakproof sheet via an outer layer adhesive layer, the side sheet has a main body side adhesive layer for fixing an absorbent main body side end portion of the elastic member or a vicinity thereof, and a distal end side adhesive layer for fixing a distal end side end portion of the side sheet of the elastic member or a vicinity thereof, the absorbent main body side end portion of the side sheet is reinforced with a reinforcing adhesive layer superposed on or continuous with the main body side adhesive layer, the reinforced end portion is bonded to the outer layer composite sheet with a connecting adhesive layer, and the main body side adhesive layer is formed at a position outside the outer layer adhesive layer with a gap therebetween in a diaper width direction, the main body side adhesive layer, the reinforcing adhesive layer, the connecting adhesive layer, and the outer layer adhesive layer are provided so as not to form a gap in the diaper width direction (patent document 1). Such a disposable diaper can suppress a decrease in softness or the like and improve the joining strength between the side sheet and the absorbent main body.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2013-46751

Disclosure of Invention

The present invention provides a disposable diaper, comprising: an absorbent body including an absorbent body and an outer composite sheet disposed on an outer surface side of the absorbent body; and side panels installed at one or both side portions of the absorbent main body. The side sheet is provided with 2 sheets and an elastic component fixed between the 2 sheets, and the front end part of the side sheet is provided with a fastening tape. The outer layer composite sheet has a liquid-impermeable or liquid-impermeable barrier sheet and an outer layer nonwoven fabric bonded to the outer surface side of the barrier sheet via an outer layer adhesive layer. The side sheet is bonded to the outer composite sheet and a skin side sheet disposed on the inner surface side of the side sheet via a bonding adhesive layer. The adhesive layer for connection is configured to join the side sheet to the outer composite sheet at a position closer to the outside than the inner edge of the side sheet in the width direction of the disposable diaper, and join the outer composite sheet to the skin side sheet at a position closer to the inside than the inner edge of the side sheet. The disposable diaper has a discontinuous portion where no adhesive is disposed at a position where the outer layer adhesive layer overlaps the inner edge of the side sheet in the thickness direction of the disposable diaper.

Drawings

Fig. 1 is a plan view showing a developed and extended state of a disposable diaper according to an embodiment of the present invention.

Fig. 2 is a perspective view showing a wearing state of the disposable diaper shown in fig. 1.

Fig. 3 is an enlarged plan view showing a side sheet of the disposable diaper shown in fig. 1 and its vicinity.

Fig. 4 is a sectional view IV-IV of fig. 3.

Fig. 5 is an enlarged cross-sectional view showing a joining method of the respective components in the vicinity of the inner edge of the side sheet shown in fig. 4.

Detailed Description

In the diaper described in patent document 1, when the fastening tape or the like provided at the front end portion of the side sheet is stretched and the diaper is worn, the occurrence of cracks or breakage at the joining portion between the side sheet and the absorbent main body or in the vicinity thereof can be suppressed.

The present invention addresses the problem of providing a disposable diaper that can solve the disadvantages of the prior art.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in fig. 1, a disposable diaper 1 (hereinafter, also referred to as a diaper 1) of the present invention includes: an absorbent body 2 including an absorbent body 23 and an outer composite sheet 22 disposed on the outer surface side of the absorbent body 23; and

side sheets

3, 3 attached to both side portions of the absorbent main body 2.

As shown in fig. 1, the absorbent main body 2 has a vertically long shape in an unfolded and extended state, and includes: a ventral portion A which is positioned on the ventral side of the wearer when worn; a back side portion B located on the back side of the wearer; and a crotch portion C located at the crotch portion. As shown in fig. 1, the absorbent main body 2 has a rectangular shape in a state of being spread in a planar shape. The

side sheets

3, 3 are attached to both side portions of the absorbent main body 2 in the back portion B so as to protrude outward from both side edge portions of the absorbent main body 2.

Here, the unfolded and stretched state of the diaper 1 refers to a state in which the elastic members of the respective portions are stretched to expand the diaper 1 in the unfolded state to a designed size (the same size as that in the case of planar expansion in a state in which the influence of the elastic members is completely eliminated).

The longitudinal direction of the disposable diaper 1 is the Y direction in the figure, and is the same direction as the longitudinal direction of the absorbent main body. The width direction of the disposable diaper 1 is the X direction in the figure, and is the same direction as the width direction of the absorbent main body 2. In the following description, the longitudinal direction of the diaper 1 or the direction corresponding to the diaper longitudinal direction of the components of the diaper 1 will be simply referred to as the Y direction, and the width direction of the diaper 1 or the direction corresponding to the diaper width direction of the components of the diaper 1 will be simply referred to as the X direction. The inner surface of the component of the diaper 1 or the diaper 1 is a surface facing the skin of the wearer when worn, and the outer surface of the component of the diaper 1 or the diaper 1 is a surface facing the opposite side of the skin of the wearer when worn. Further, the inside of the diaper 1 or the constituent member of the diaper 1 is the absorbent main body side in the width direction of the diaper 1, and the outside of the diaper 1 or the constituent member of the diaper 1 is the fastening tape 4 side in the width direction of the diaper 1.

As shown in fig. 1 and 4, the absorbent main body 2 includes a liquid-permeable topsheet 21, an outer composite sheet 22, and a liquid-retentive absorbent member 23 interposed between the

sheets

21, 22. The outer layer composite sheet 22 has a liquid-impermeable or liquid-impermeable (including water repellency) barrier sheet 22a, and an outer layer nonwoven fabric 22b bonded to the outer surface side (Q side in fig. 4) of the barrier sheet 22a via an outer layer adhesive layer 61. The outer layer nonwoven fabric 22b has the same shape in plan view as the absorbent main body 2, and as shown in fig. 4, the leakproof sheet 22a has the same shape in plan view as the outer layer nonwoven fabric 22b except that the width in the X direction is slightly smaller. The outer layer nonwoven fabric 22b provides a good skin feel on the outer surface of the diaper.

As shown in fig. 1, the absorbent main body 2 is provided with three-dimensional

barrier forming sheets

24, 24 on both sides in the longitudinal direction thereof. As shown in fig. 4, the three-dimensional containment sheet 24 is fixed to the topsheet 21, the outer composite sheet 22 extending from the side edge of the topsheet, and the sheet 31 constituting the side sheet 3, via

adhesive layers

62, 66 to 68, on both sides in the longitudinal direction of the absorbent main body 2. The

adhesive layers

62, 66, 67 are formed over substantially the entire length of the absorbent main body 2, but the adhesive layers 68 are provided on the front side portion a and the back side portion B, but not on the crotch portion C.

Each of the three-dimensional-enclosure forming sheets 24 has an elastic member 25 for forming a three-dimensional enclosure along an end edge on the inner side in the width direction (X direction) of the absorbent main body 2 in the vicinity of the end edge, and when worn, a portion of the crotch portion C having a predetermined width from the end edge is separated from the topsheet 21 by a contraction force of the elastic member 25 to form a three-dimensional enclosure. As shown in fig. 1, leg gather forming elastic members 26 are disposed in leg hole portions disposed on both longitudinal side portions of the absorbent main body 2.

In the present embodiment, 1 sheet is used as the sheet 24 for forming the three-dimensional barrier without folding. Instead of this structure, a structure in which 1 sheet is folded into a 2-layer structure and the 2 layers are bonded to each other by a heat-bonding portion arranged in a scattered manner to form 1 sheet may be used. In addition, 1 sheet may be used in a 2-layer structure only in the portion to which the elastic member 25 is fixed.

For example, heat sealing, ultrasonic sealing, high-frequency sealing, or a combination of 2 or more of these can be used for heat sealing for joining the layers of the 2-layer structure portion. Further, the bonding can be performed by an adhesive disposed in a scattered manner.

The seal pattern is preferably a dot pattern in which heat-fused portions are formed in a scattered manner, but is not limited to this, and may be a linear pattern or a lattice pattern in which 1 or more linear heat-fused portions are formed in the longitudinal direction of the diaper 1, for example. In addition, more than 2 sealing patterns can be used simultaneously.

The leg cuff forming sheet 24 in the diaper 1 forms the inner surface of both side portions of the absorbent main body 2. The three-dimensional containment flaps 24 are joined to both side portions of the topsheet 21 disposed on the inner surface side of the absorbent body 23.

The front sheet 21 and a pair of three-dimensional containment flaps 24 arranged on the inner surface side in a state in which a part of the front sheet 21 overlaps both side portions in the Y direction form a skin side sheet 20 facing the skin of the wearer when the diaper 1 is worn. The skin side sheet 20 in the diaper 1 includes a topsheet 21 and a leg hole forming sheet 24 connected to both sides thereof. The skin side sheet 20 may be disposed on the inner surface side of the side sheet 3 at least in a portion overlapping the side sheet 3. The skin side sheet may have a structure including only the front sheet.

The "inner surface side of the sheet" is the P side in fig. 4 (the surface side of the side sheet facing the skin of the wearer), and the "outer surface side of the sheet" is the Q side in fig. 4 (the surface side of the side sheet facing the opposite side of the skin of the wearer).

As shown in fig. 1, the diaper 1 is formed symmetrically with respect to a longitudinal center line CL that divides the absorbent main body 2 into equal parts in the width direction (X direction) 2. Therefore, the configurations of the side sheets 3 and the manner of joining them to the absorbent main body 2 and the fastening tape 4 will be described mainly by taking the left side sheet of fig. 1 as an example, and the right side sheet is similar except for the bilateral symmetry.

As shown in fig. 3, the side sheet 3 in the diaper 1 is rectangular in a state of being spread out in a planar shape. As shown in fig. 4, the side sheet 3 further includes: 2

sheets

31, 32 made of nonwoven fabric; and a plurality of elastic members 33 fixed between the 2

sheets

31, 32 in a state of being stretched in the diaper width direction (X direction). A fastening tape 4 for fixing the side sheet 3 to another portion is provided at the front end portion 3a of the side sheet 3. As shown in fig. 4, the fastening tape 4 is joined to the sheet 32 on the outer surface side of the side sheet 3 via an adhesive layer 65.

As shown in fig. 3, the elastic members 33 are arranged along the width direction (X direction) of the diaper 1. The plurality of elastic members 33 in each side sheet 3 are disposed at substantially equal intervals in the longitudinal direction (Y direction) of the diaper.

As shown in fig. 4, the side sheet 3 of the diaper 1 is formed by bonding 2

sheets

31 and 32 constituting the side sheet 3 to each other via

adhesive layers

35, 36, and 37. These

adhesive layers

35, 36, and 37 are formed to extend in the diaper longitudinal direction (Y direction). In these

adhesive layers

35, 36, and 37, the plurality of elastic members 33 are fixed in an extended state between the 2

sheets

31 and 32 via the adhesive constituting each adhesive layer, and the 2

sheets

31 and 32 are directly bonded to each other via the adhesive constituting each adhesive layer at a portion where the elastic members 33 are not arranged.

The adhesive layer 35 is provided on the absorbent body 2 side in the extending direction of the side sheet 3, and fixes the end portions of the elastic members 33 on the absorbent body 2 side or the vicinity thereof. The adhesive layer 36 is provided on the side of the front end portion 3a in the extending direction of the side sheet 3, and fixes the end portion of each elastic member 33 on the side of the front end portion 3a of the side sheet 3 or its vicinity. As shown in fig. 3, a plurality of adhesive layers 37 are provided in the intermediate region 30 which is a region between the adhesive layer 35 and the adhesive layer 36 in the extending direction of the side sheet 3. The adhesive layer 37 has a smaller width than either of the

adhesive layers

35 and 36, and is intermittently formed in a plurality of the intermediate regions 30, but may be continuously formed in the width direction (X direction) of the diaper. The adhesive layer 37 may be formed continuously with either or both of the

adhesive layers

35 and 36. In the diaper 1 of the present embodiment, the extending direction of the side sheet 3 coincides with the diaper width direction.

As shown in fig. 3, each of the

adhesive layers

35, 36, 37 intersects with a plurality of (more preferably 3 or more) elastic members 33 extending in the X direction and extends in the diaper longitudinal direction (Y direction). These

adhesive layers

35, 36, 37 preferably extend in the diaper longitudinal direction (Y direction) so as to intersect all the elastic members 33 extending in the X direction, and more preferably are provided over the entire length between the upper and

lower edges

3u, 3d of the side sheet 3.

As shown in fig. 4, the sheet 32 located on the outer surface side (Q side in fig. 4) of the 2

sheets

31 and 32 constituting the side sheet 3 is folded back toward the inner surface side (Q side in fig. 4) of the sheet 32 at both

end portions

3a and 3b of the side sheet 3, and the folded-back portions are joined to the inner surface of the sheet 32 via reinforcing

adhesive layers

63 and 64, respectively, in the side sheet 3.

On the other hand, of the 2

sheets

31 and 32 constituting the side sheet 3, the sheet 31 located on the inner surface side (P side in fig. 4) of the side sheet 3 is not folded back either toward the outer surface side or toward the inner surface side of the sheet 31.

In this manner, the 2

sheets

31 and 32 constituting the side sheet 3 may be folded back to the outer surface side (Q side in fig. 4) or the inner surface side (P side in fig. 4) of the

sheets

31 and 32, or may not be folded back to the outer surface side or the inner surface side of the

sheets

31 and 32.

As shown in fig. 4, in the side sheet 3 of the present embodiment, reinforcing

adhesive layers

63 and 64 are formed at both ends 3a and 3b in the width direction of the sheet 32 on the outer surface side, respectively. As shown in fig. 4, the reinforcing

adhesive layers

63 and 64 formed at the both

end portions

3a and 3b in the width direction of the 2

pieces

31 and 32 constituting the side sheet 3 may be formed at portions folded back toward the inner surface side of the piece 32 located on the outer surface side (Q side in fig. 4) of the side sheet 3, or may be formed at portions folded back toward the outer surface side of the piece 32 located on the outer surface side (Q side in fig. 4) of the side sheet 3. In either case, the bonding strength of the side sheet 3 is improved by forming the reinforcing adhesive layer. As shown in fig. 4, the reinforcing

adhesive layers

63 and 64 may be connected to the

adhesive layers

35 and 36 that join the 2

sheets

31 and 32, respectively, or may not be connected to them.

In addition, each of the 2

sheets

31 and 32 constituting the side sheet 3 may not have a folded portion at both

end portions

3a and 3b in the width direction.

The side sheet 3 is joined to the outer composite sheet 22 and the skin side sheet 20 disposed on the inner surface side of the side sheet 3 via a joining adhesive layer 62. The connecting adhesive layer 62 bonds the side sheet 3 and the outer composite sheet 22 to each other at a position outside the inner edge 3c of the side sheet 3 in the X direction, and bonds the outer composite sheet 22 and the skin side sheet 20 to each other at a position inside the inner edge 3c of the side sheet 3. More specifically, as shown in fig. 5, the joining adhesive layer 62 is disposed outside and inside the inner edge 3c of the side sheet 3, and the inner end 3b of the side sheet 3 and the leakproof sheet 22a are joined to each other on the outside, and the leakproof sheet 22a and the three-dimensional enclosure forming sheet 24 or the front sheet 21 are joined to each other on the inside.

In the present embodiment, as shown in fig. 4, the adhesive layer 62 for connection is spaced apart from the adhesive layer 66 that bonds the inner surface side sheet 31 of the side sheet 3 and the sheet 24 for three-dimensional containment formation, but may be continuous with the adhesive layer 66. As shown in fig. 4, the joining adhesive layer 62 is spaced apart from the adhesive layer 67 that joins the top sheet 21 and the space-surrounding formation sheet 24, but may be joined to the adhesive layer 67.

As shown in fig. 5, the outer layer adhesive layer 61 bonds the leakproof sheet 22a constituting the outer layer composite sheet 22 and the outer layer nonwoven fabric 22b, and further has a discontinuous portion 7 where no adhesive is disposed at a position overlapping with the inner edge 3c of the side sheet 3 in the thickness direction Z of the diaper 1.

In the intermittent portions 7, the leakproof sheet 22a is not joined to the outer layer nonwoven fabric 22b, and thus the leakproof sheet 22a is easily stretched in the width direction (X direction). Thus, when the side sheet 3 is stretched outward and the diaper 1 is worn, the leakage-preventing sheet 22a is prevented from being locally concentrated in deformation, and the leakage-preventing sheet 22a is less likely to be torn in the width direction.

On the other hand, if the outer surface of the leakproof sheet 22a is continuously bonded to the outer layer nonwoven fabric 22b via the outer layer adhesive layer 61 in the width direction and the inner surface of the leakproof sheet 22a is continuously bonded to the side sheet 3 and the topsheet 21 via the connecting adhesive layer 62 in the width direction, the leakproof sheet 22a is hard to stretch in both the inside and the outside in the width direction (X direction). Therefore, when the side sheet 3 is stretched outward, the leakproof sheet 22a is tensioned outward via the joining adhesive layer 62, and the deformation is locally concentrated near the inner edge 3c of the side sheet 3. Thus, the leakproof sheet 22a may be torn at a portion overlapping with the inner edge 3c in the thickness direction Z of the diaper.

The intermittent portions 7 are disposed at positions overlapping the inner edges 3c of the side sheets 3 in the thickness direction Z. The position overlapping the inner edge 3c is indicated by an inner edge line 3cL (see fig. 5).

From the viewpoint of further suppressing the leakage-preventing sheet 22a from being cracked in the width direction, the length W1 (see fig. 5) of the intermittent portion 7 in the width direction (X direction) is preferably 1mm or more, more preferably 1.5mm or more, and further preferably 5mm or less, more preferably 3mm or less, preferably 1mm or more and 5mm or less, and more preferably 1.5mm or more and 3mm or less.

When the intermittent portion 7 is divided into the inboard portion 7a and the outboard portion 7b at the inner edge line 3cL of the side sheet 3, the length W1a (see fig. 5) of the inboard portion 7a in the width direction (X direction) is preferably 0.5mm or more, more preferably 1mm or more, and is preferably 5mm or less, more preferably 3mm or less, preferably 0.5mm or more and 5mm or less, and more preferably 1mm or more and 3mm or less. Further, the length W1b (see fig. 5) of the outer portion 7b in the width direction (X direction) is preferably 0.5mm or more, more preferably 1mm or more, and is preferably 5mm or less, more preferably 3mm or less, preferably 0.5mm or more and 5mm or less, more preferably 1mm or more and 3mm or less.

In the present description, the dimensions and the like of the respective portions such as the intermittent portions 7 are measured in a state where the elastic member such as the elastic member 33 is stretched to expand the side sheet or the diaper to a design dimension (the same as the dimensions in the case of planar expansion with the influence of the elastic member completely excluded).

As shown in fig. 5, the outer layer adhesive layer 61 has stripe coated portions 70 in which portions 71 in which an adhesive is disposed are intermittently disposed in the width direction (X direction) in a region R overlapping the vicinity of the inner edge 3c of the side sheet 3 in the thickness direction Z of the diaper 1. Between the portions 71 where the adhesive is disposed, portions 72 where no adhesive is disposed are disposed, and one of the portions 72 constitutes the discontinuous portion 7. With this configuration, when the side sheet 3 is stretched outward in the width direction, the strain on the leakproof sheet 22a can be further suppressed from being locally concentrated in the region near the inner edge 3 c. In this manner, the outer layer adhesive layer 61 preferably has stripe-coated portions 70 in a region R overlapping the inner edge 3c of the side sheet 3 and the vicinity thereof in the thickness direction Z of the diaper 1. In the stripe coating portion 70, one of the portions 72, which are located between the portions 71 where the adhesive is disposed and where the adhesive is not disposed, preferably constitutes the discontinuous portion 7. The stripe coating portion 70 may include 2 or more portions 72 including the discontinuous portions 7 where no adhesive is disposed.

The stripe coating portion 70 may be disposed in the region R of the outer layer adhesive layer 61 overlapping the inner edge 3c of the side sheet 3 and the vicinity thereof in the thickness direction Z, or may be disposed over the entire width direction of the outer layer adhesive layer 61. The region R overlapping the inner edge 3c of the side sheet 3 and the vicinity thereof is a region within 10mm from both sides of the inner edge 3c in the width direction (X direction).

From the viewpoint of more reliably exhibiting the above-described effect, the length W2 (see fig. 5) of the portion 71 in which the adhesive is arranged in the width direction (X direction) is preferably 0.5mm or more, more preferably 1mm or more, and further preferably 3mm or less, more preferably 2mm or less, preferably 0.5mm or more and 3mm or less, and more preferably 1mm or more and 2mm or less.

The length W2 (see fig. 5) of the portion 71 in which the adhesive is disposed in the width direction (X direction) is preferably 20% or more, more preferably 30% or more, and further preferably 100% or less, more preferably 80% or less, preferably 20% or more and 100% or less, more preferably 30% or more and 80% or less, with respect to the length W3 (see fig. 5) of the portion 72 in which the adhesive is not disposed.

The length W3 (see fig. 5) of the portion 72 in the width direction (X direction) where no adhesive is disposed is preferably 1mm or more, more preferably 1.5mm or more, and is preferably 5mm or less, more preferably 3mm or less, preferably 1mm or more and 5mm or less, more preferably 1.5mm or more and 3mm or less.

The outer composite sheet 22 preferably has a shear strength in the width direction between the leakproof sheet 22a and the outer nonwoven fabric 22b larger than the tensile strength of the leakproof sheet 22a in the width direction at a position outside the inner edge 3c of the side sheet 3. According to this structure, the bonding strength between the side sheet 3 and the absorbent main body 2 can be more reliably ensured against a load in the shearing direction applied to the outer layer adhesive layer 61 when the side sheet 3 is stretched outward in the width direction. Whether the shear strength of the outer composite sheet 22 is greater than the tensile strength of the barrier sheet 22a can be determined by tearing the barrier sheet 22a in the width direction (X direction) when the side sheet 3 is stretched, compared to the peeling of the barrier sheet 22a and the outer nonwoven fabric 22 b. A method of confirming the magnitude relationship between the shear strength of the outer composite sheet 22 and the tensile strength of the leakproof sheet 22a in more detail is as follows. The portion including the portion near the inner edge 3c of the side sheet 3 shown in fig. 5 is cut out from the diaper 1 as a rectangular sample sheet having a long side in the width direction (X direction) and a short side in the longitudinal direction (Y direction). The leakproof sheet 22a and the outer nonwoven fabric 22b of the sample sheet are cut in the longitudinal direction (Y direction) at a position corresponding to the inner edge line 3 cL. Thereafter, the side sheet 3 of the sample piece and the absorbent main body 2 are sandwiched at a position closer to the longitudinal center line cL than the inner edge line 3cL, and are stretched in the width direction (X direction) until the sample piece is broken. At this time, if the leakproof sheet 22a is split in the width direction (X direction) before the leakproof sheet 22a and the outer layer nonwoven fabric 22b are peeled off, it can be determined that the shear strength of the outer layer composite sheet 22 is greater than the tensile strength of the leakproof sheet 22 a.

The shear strength of the outer composite sheet 22 can be improved by: when the leakproof sheet 22a is bonded to the outer layer nonwoven fabric 22b via the adhesive 61, the nonwoven fabric is firmly pressed or pressed while being heated.

The tensile strength of the leakproof sheet 22a in the width direction (X direction) is preferably 100cN/25mm or more, more preferably 150cN/25mm or more, and further preferably 400cN/25mm or less, more preferably 300cN/25mm or less, preferably 100cN/25mm or more and 400cN/25mm or less, and more preferably 150cN/25mm or more and 300cN/25mm or less. The tensile strength was measured as described below. First, the outer layer nonwoven fabric 22b and the leakproof sheet 22a are separated from the diaper 1 by using a solvent for dissolving an adhesive or cold spray. The separated leakproof sheet 22a was cut into a sample sheet in the form of a short strip having a width of 25mm in the longitudinal direction (Y direction) and a width of about 100mm in the width direction (X direction). The maximum point load when the sample sheet is stretched in the direction corresponding to the diaper width direction (X direction) was measured using a tensile tester ("Tensilon" RTC-1150A from Orientec corporation), and the measured maximum point load was set as the tensile strength of the leakproof sheet 22 a. At this time, the interval between the clamps was set to 50mm, and the drawing speed was set to 300 mm/min.

The outer layer nonwoven fabric 22b preferably has a tensile strength in the width direction (X direction) greater than that of the leakproof sheet 22 a. According to this structure, even if a load is applied to the outer layer nonwoven fabric 22b in the width direction by stretching the side sheet 3 outward in the width direction, the outer layer nonwoven fabric 22b can be further inhibited from being cracked in the width direction.

From the viewpoint of more reliably exhibiting the above-described effects, the tensile strength of the outer layer nonwoven fabric 22b in the width direction (X direction) is preferably 300cN/25mm or more, more preferably 400cN/25mm or more, and further preferably 1000cN/25mm or less, more preferably 800cN/25mm or less, preferably 300cN/25mm or more and 1000cN/25mm or less, and more preferably 400cN/25mm or more and 800cN/25mm or less. The tensile strength of the outer layer nonwoven fabric 22b can be measured in the same manner as the tensile strength of the leakproof sheet 22 a.

As shown in fig. 5, the outer edge 22a1 of the leakage preventive sheet 22a is located outside the inner edge 3c of the side sheet 3 and inside the outer edge 22b1 of the outer layer nonwoven fabric 22b in the width direction (X direction) of the leakage preventive sheet 22 a. In other words, the outer edge 22a1 of the leakproof sheet 22a is positioned between the outer edge 22b1 of the outer layer nonwoven fabric 22b and the inner edge 3c of the side sheet 3 in the width direction (X direction). The portion of the outer nonwoven fabric 22b extending from the outer edge 22a1 of the leakproof sheet 22a is also referred to as an extending portion 22b 2. In the side sheet 3, the inner end 3b of the side sheet 3 is joined to the extending portion 22b2 of the outer layer nonwoven fabric 22b via the joining adhesive layer 62 in the width direction (X direction). In this manner, in the joining adhesive layer 62, a portion joining the inner end 3b of the side sheet 3 and the extension portion 22b2 of the outer layer nonwoven fabric 22b is also referred to as an extension adhesive portion 62 a. According to this configuration, since the portion where the side sheet 3 and the outer layer nonwoven fabric 22b are directly joined is provided, when the side sheet 3 is stretched outward in the width direction, the load in the shearing direction applied to the joined portion of the leakproof sheet 22a and the outer layer nonwoven fabric 22b can be further reduced. In this manner, it is preferable that the outer edge 22a1 of the leakproof sheet 22a is positioned further outward than the inner edge 3c of the side sheet 3 and further inward than the outer edge 22b1 of the outer layer nonwoven fabric 22b in the width direction, and the inner end 3b of the side sheet 3 is joined to the extended portion 22b2 of the outer layer nonwoven fabric 22b extending from the outer edge of the leakproof sheet 22a via the joining adhesive layer 62 in the width direction in the side sheet 3.

From the viewpoint of more reliably exhibiting the above-described effects, the length W5 (see fig. 5) of the extended portion 22b2 of the outer layer nonwoven fabric 22b in the width direction (X direction) is preferably 5mm or more, more preferably 10mm or more, and further preferably 30mm or less, more preferably 20mm or less, preferably 5mm or more and 30mm or less, and more preferably 10mm or more and 20mm or less.

The length W6 (see fig. 5) of the extension adhesive part 62a in the adhesive layer 62 for connection is preferably 30% or more, more preferably 60% or more, and preferably 100% or less, more preferably 90% or less, preferably 30% or more and 100% or less, more preferably 60% or more and 90% or less, with respect to the length W5 of the extension part 22b2 of the outer layer nonwoven fabric 22 b.

The length W6 (see fig. 5) of the extended adhesive portion 62a in the adhesive layer 62 for connection is preferably 3mm or more, more preferably 5mm or more, and is preferably 20mm or less, more preferably 10mm or less, preferably 3mm or more and 20mm or less, more preferably 5mm or more and 10mm or less.

As shown in fig. 5, the connecting adhesive layer 62 has a discontinuous portion 75 where no adhesive is disposed in the vicinity of the inner edge 3c of the side sheet 3. With this configuration, local concentration of strain on the leak-proof sheet 22a can be further suppressed. As described above, the adhesive layer 62 for connection preferably has a discontinuous portion 75 where no adhesive is disposed at a position overlapping the inner edge 3c of the side sheet 3 in the thickness direction Z of the diaper 1, as shown in fig. 5.

From the viewpoint of more reliably exhibiting the above-described effects, the length W4 (see fig. 5) of the discontinuous portion 75 of the bonding adhesive layer 62 in the width direction (X direction) is preferably 1mm or more, more preferably 1.5mm or more, and is preferably 5mm or less, more preferably 3mm or less, preferably 1mm or more and 5mm or less, and more preferably 1.5mm or more and 3mm or less.

When the intermittent part 75 of the joining adhesive layer 62 is divided into the inner part 75a and the outer part 75b with the inner edge 3c of the side sheet 3 as a boundary, the length W4a (see fig. 5) of the inner part 75a in the width direction (X direction) is preferably 0.5mm or more, more preferably 1mm or more, and further preferably 5mm or less, more preferably 3mm or less, preferably 0.5mm or more and 5mm or less, and more preferably 1mm or more and 3mm or less. Further, the length W4b (see fig. 5) of the outer portion 75b in the width direction (X direction) is preferably 0.5mm or more, more preferably 1mm or more, and is preferably 5mm or less, more preferably 3mm or less, preferably 0.5mm or more and 5mm or less, more preferably 1mm or more and 3mm or less.

In the present embodiment, the length W4 in the width direction (X direction) of the intermittent portions 75 of the coupling adhesive layer 62 is the same as the length W1 in the width direction (X direction) of the intermittent portions 7 of the outer layer adhesive layer 61, but the lengths W1 and W4 in the width direction of the

intermittent portions

7 and 75 may be different from each other.

When the diaper 1 is worn by a wearer, the fastening portion 41 of the fastening tape 4 is pressed against the fastening region 5 and fixed in a state where the fastening tape 4 is stretched by hand to extend the side sheet 3.

The bonding adhesive layer 62, the outer adhesive layer 61, and the

adhesive layers

35, 36, 37, 63, 64, and 65 can be formed by the following method: after applying an adhesive to either or both of the 2 sheets sandwiching each adhesive layer by various known methods, the 2 sheets are superposed and pressed.

Further, the coating pattern of the adhesive forming each adhesive layer is preferably so-called full coating using a spray gun, a coating gun, or the like as an adhesive coating machine, but pattern coating such as linear, spiral, Ω -shaped, dot-shaped, or the like can also be performed using a bead gun, a spiral spray gun, an Ω -shaped spray gun, a transfer roller, or the like as an adhesive coating machine.

As the

sheets

31 and 32 constituting the side sheet 3, the side sheet 3 can be used, without particular limitation, various sheets conventionally used in absorbent articles such as disposable diapers and sanitary napkins. From the viewpoint of preventing the occurrence of strain in the vicinity of the inner edge 3c of the side sheet 3 when the side sheet 3 is stretched outward in the width direction, the side sheet 3 is preferably a stretchable side sheet having 2 non-stretchable sheets and an elastic member 33 disposed between the 2 non-stretchable sheets in a stretched state. Here, the non-stretchable sheet means a sheet having an elongation recovery (%) of 20% or less as measured by the "method for measuring elongation recovery", or a sheet which is broken before 100% elongation.

The elongation recovery of the non-stretchable sheet was measured by the following measurement method.

[ method of measuring elongation recovery ]

A sample piece of a piece having a length of 50mm and a width of 25mm was prepared, and the sample piece was fixed at a jig interval K0 using a tensile tester ("Tensilon" RTC-1150A of Orientec corporation), and elongated at a speed of 300mm/min to a length K2(K2 is K0 × 2) at which the sample piece was elongated by 100%, and then recovery was started at the same speed as the tensile speed, and the length of the sample piece at which the stress became 0 was set to a length K1 after the elongation recovery. The elongation recovery at 100% elongation was calculated from the following equation.

Elongation recovery (%) at 100% ((K2-K1)/(K2-K0)). times.100

The non-stretchable sheet may or may not have extensibility, but the maximum elongation is preferably 90% or less. The extensibility referred to herein may be any of the following: the case where the constituent fibers themselves are elongated; and a case where the structural fibers themselves are not elongated, but the entire fiber layer is elongated because two fibers thermally welded at the intersection points of the fibers are separated from each other, or because a three-dimensional structure formed by a plurality of fibers is changed in structure by thermal welding of the fibers or the like, or the structural fibers are broken.

The non-stretchable sheet is preferably a nonwoven fabric, a laminate of a nonwoven fabric and a resin film, a porous film, or the like. The non-stretchable sheet is preferably formed of a nonwoven fabric containing thermoplastic fibers from the viewpoint of satisfactory air permeability and texture, and is preferably formed of a nonwoven fabric having water repellency from the viewpoint of prevention of leakage of excrement.

The linear elastic member 33 disposed in the stretchable side sheet 3 preferably has a width (dimension in the Y direction) or diameter of 0.1mm to 2mm, more preferably 0.1mm to 1mm, from the viewpoint of enhancing flexibility or ensuring stretchability of the stretchable side sheet 3. The number of the linear elastic members 33 disposed in the stretchable side sheet 3 is preferably about 1 to 25, more preferably about 3 to 20. The elongation can be appropriately selected from the elongation known in the art, and the linear 1 elastic members 33 having a stress of 0.1N or more and 1N or less when elongated to 100% elongation are preferably arranged and fixed in an elongated state in a range of 50% or more and 300% or less elongation, and more preferably arranged and fixed in an elongated state in a range of 100% or more and 250% or less elongation. The elongation is a ratio of a length increased by elongation to a natural length, and for example, when an elastic member having a length of 10cm is elongated to 20cm, the elongation is 100%.

The plurality of elastic members 33 in the stretched state are fixed between the inner surface side sheet 31 and the outer surface side sheet 32 via a plurality of adhesives (not shown) that intersect the respective elastic members 33 and extend in the Y direction, and at a portion where the elastic members 33 are not provided, the inner surface side sheet 31 and the outer surface side sheet 32 are directly joined to each other via the respective adhesives (not shown). The plurality of adhesives (not shown) preferably extend in the Y direction so as to intersect all of the linear elastic members 33 extending in the X direction, and more preferably extend over the entire length of the stretchable side sheet 3 in the Y direction. A plurality of adhesives (not shown) are disposed at substantially equal intervals in the X direction. The stretchable side sheet 3 is formed by applying a plurality of adhesives (not shown) to either or both of the inner surface side sheet 31 and the outer surface side sheet 32 by various known methods, and after the application, the

sheets

31 and 32 are superposed and pressed to fix a plurality of elastic members 33 in an extended state. As shown in fig. 3, the elastic member 33 in the stretchable side sheet 3 formed in this manner has an inner (in the absorbent main body 2) fixed end 33I and an outer fixed end 33O in the X direction, and the inner fixed end 33I and the outer fixed end 33O have no contractive force and are in a non-stretchable state. The length of the outer fixed end portion 33O in the X direction is preferably in a range of 10% to 40%, more preferably 15% to 35%, of the total length of the linear elastic member 33 in the X direction in the natural state of the stretchable side sheet 3 shown in fig. 3. The length of the inner fixed end 33I in the X direction is also the same as the length of the outer fixed end 33O in the X direction. The stretchable side sheet 3 may be fixed by an adhesive (not shown) or may be fixed by fusion by heat sealing or the like.

The constituent members of the diaper 1 will be described as constituent materials.

As the tape base 42 of the fastening tape 4, various sheets conventionally used in absorbent articles such as disposable diapers and sanitary napkins can be used without particular limitation.

For example, as the

sheets

31 and 32 and the tape base material 42, a nonwoven fabric, a woven fabric, a film, a laminated sheet thereof, or the like can be used.

As the topsheet 21, the outer composite sheet 22, and the absorbent body 23 constituting the absorbent main body 2, materials conventionally used in absorbent articles such as disposable diapers and sanitary napkins can be used without particular limitation. For example, a hydrophilic liquid-permeable nonwoven fabric, a three-dimensional apertured film, or the like can be used as the topsheet 21. As the outer composite sheet 22, a configuration may be used in which the leakproof sheet 22a is made of a resin film having liquid impermeability or liquid impermeability (including water repellency), and the outer nonwoven fabric 22b is made of a nonwoven fabric (for example, a hot air nonwoven fabric, a spun-bonded nonwoven fabric, a spunlace nonwoven fabric, a needle-punched nonwoven fabric, or the like) produced by various production methods. The outer layer nonwoven fabric 22b may have a multilayer structure. As the absorbent body 23, a structure in which an aggregate of fibers such as pulp fibers (which may be a nonwoven fabric) or an absorbent core in which particles of a water-absorbent polymer are held is covered with a core sheet including a water-permeable thin paper or a nonwoven fabric, or the like, can be used. As the sheet 24 for forming the three-dimensional enclosure, a film, a nonwoven fabric, a woven fabric, a laminate sheet thereof, or the like can be used.

As the elastic member 33, the elastic member 25 constituting the three-dimensional enclosure, and the leg elastic member 26, a linear or string-like elastic member including natural rubber, polyurethane, a polystyrene-polyisoprene copolymer, a polystyrene-polybutadiene copolymer, a polyethylene- α -olefin copolymer such as ethyl acrylate-ethylene, or the like can be used. In view of manufacturing cost and simplification of manufacturing steps, it is preferable to dispose the elastic members 33 of the same type at the same elongation rate in the plurality of elastic members 33 disposed in the 1-piece side sheet.

Preferable materials of the adhesive for joining the members, which is represented by the adhesive 35 for fixing the elastic member 33, include: thermoplastic polymers such as amorphous polyolefin, ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic ester copolymer (EEA), styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), styrene-ethylene/butylene-styrene block copolymer (SEBS), styrene-ethylene/propylene-styrene block copolymer (SEPS), and mixtures thereof. The adhesive is preferably of the hot melt type.

The scope of the present invention is not limited by this embodiment. The present invention further discloses the following disposable diaper.

＜1＞

A disposable diaper, comprising: an absorbent main body having an absorbent body and an outer composite sheet disposed on the outer surface side of the absorbent body; and side sheets attached to one or both side portions of the absorbent main body, in the disposable diaper,

the side piece is provided with 2 pieces and an elastic component fixed between the 2 pieces, the front end part is provided with a magic tape,

the outer composite sheet has a liquid-impermeable or liquid-impermeable barrier sheet and an outer nonwoven fabric bonded to the outer surface of the barrier sheet via an outer adhesive layer,

the side sheet is bonded to the outer composite sheet and the skin side sheet on the inner surface side of the side sheet via a bonding adhesive layer,

the connecting adhesive layer bonds the side sheet and the outer composite sheet at a position outside an inner edge of the side sheet and bonds the outer composite sheet and the skin side sheet at a position inside the inner edge of the side sheet in a width direction of the disposable diaper,

the outer layer adhesive layer has a discontinuous portion where no adhesive is disposed at a position overlapping the inner edge of the side sheet in the thickness direction of the disposable diaper.

＜2＞

The disposable diaper according to < 1 >, wherein the length W1 of the intermittent part in the width direction is 1mm or more, preferably 1.5mm or more, and 5mm or less, preferably 3mm or less.

＜3＞

The disposable diaper according to < 1 > or < 2 >, wherein when the intermittent portion is divided into an inner portion and an outer portion with an inner edge line of the side sheet as a boundary, a length W1a of the inner portion in the width direction is 0.5mm or more, preferably 1mm or more, and 5mm or less, preferably 3mm or less.

＜4＞

The disposable diaper according to any one of the items < 1 > to < 3 >, wherein when the intermittent portion is divided into an inner portion and an outer portion with an inner edge line of the side sheet as a boundary, a length W1b of the outer portion in the width direction is 0.5mm or more, preferably 1mm or more, and 5mm or less, preferably 3mm or less.

＜5＞

The disposable diaper according to any one of claims < 1 > to < 4 >, wherein the outer layer adhesive layer has a stripe coating portion in a region overlapping with the inner edge of the side sheet and the vicinity thereof in the thickness direction, the stripe coating portion repeatedly disposes a portion where an adhesive is disposed and a portion where no adhesive is disposed in the width direction, and one of the portions where no adhesive is disposed between the portions where an adhesive is disposed constitutes the intermittent portion.

＜6＞

The disposable diaper according to any one of the items < 1 > to < 5 >, wherein a length W2 of the portion in the width direction where the adhesive is disposed is 0.5mm or more, preferably 1mm or more, and 3mm or less, preferably 2mm or less.

＜7＞

The disposable diaper according to any one of the items < 1 > to < 6 >, wherein a length W2 of the portion where the adhesive is disposed in the width direction is 20% or more, preferably 30% or more, and 100% or less, preferably 80% or less, with respect to a length W3 of the portion where the adhesive is not disposed.

＜8＞

The disposable diaper according to any one of the items < 1 > to < 7 >, wherein a length W3 of the portion in the width direction where no adhesive is disposed is 1mm or more, preferably 1.5mm or more, and 5mm or less, preferably 3mm or less.

＜9＞

The disposable diaper according to any one of claims < 1 > to < 8 >, wherein a shear strength in the width direction between the leakproof sheet and the outer layer nonwoven fabric in the outer layer composite sheet is greater than a tensile strength of the leakproof sheet in the width direction at a position outside an inner edge of the side sheet.

＜10＞

The disposable diaper according to any one of the items < 1 > to < 9 >, wherein the outer layer nonwoven fabric has a tensile strength in the width direction larger than that of the leakproof sheet.

＜11＞

The disposable diaper according to any one of the items < 1 > to < 10 >, wherein the barrier sheet has a tensile strength in the width direction of 100cN/25mm or more, preferably 150cN/25mm or more, and further 400cN/25mm or less, preferably 300cN/25mm or less.

＜12＞

The disposable diaper according to any one of the items < 1 > to < 11 >, wherein the tensile strength of the outer layer nonwoven fabric in the width direction is 300cN/25mm or more, preferably 400cN/25mm or more, and 1000cN/25mm or less, preferably 800cN/25mm or less.

＜13＞

The disposable diaper according to any one of the items < 1 > to < 12 >, wherein an outer edge of the leakproof sheet is positioned further to the outside than an inner edge of the side sheet and further to the inside than an outer edge of the outer layer nonwoven fabric in the width direction,

in the side sheet, an inner end portion of the side sheet is joined to an extension portion of the outer layer nonwoven fabric extending from an outer edge of the leakproof sheet via the joining adhesive layer in the width direction.

＜14＞

The disposable diaper according to < 13 >, wherein the length W5 of the extension of the outer layer nonwoven fabric in the width direction is 5mm or more, preferably 10mm or more, and 30mm or less, preferably 20mm or less.

＜15＞

The disposable diaper according to < 13 > or < 14 >, wherein the joining adhesive layer has an extension adhesive part for joining the inner end part of the side sheet and the extension part of the outer layer nonwoven fabric,

the length W6 of the stretch-bond part in the adhesive layer for connection is 30% or more, preferably 60% or more, and 100% or less, preferably 90% or less, with respect to the length W5 of the stretch part of the outer layer nonwoven fabric.

＜16＞

The disposable diaper according to any one of claims < 13 > to < 15 >, wherein the joining adhesive layer has an extension adhesive part for joining the inner end part of the side sheet and the extension part of the outer layer nonwoven fabric,

the length W6 of the extended adhesive portion in the adhesive layer for connection is 3mm or more, preferably 5mm or more, and 20mm or less, preferably 10mm or less.

＜17＞

The disposable diaper according to any one of the above-mentioned items < 1 > to < 5 >, wherein the adhesive layer for connection has a discontinuous portion where no adhesive is disposed at a position overlapping with the inner edge of the side sheet in the thickness direction.

＜18＞

The disposable diaper according to < 17 >, wherein a length W4 of the discontinuous portion of the adhesive layer for fastening in the width direction is 1mm or more, preferably 1.5mm or more, and 5mm or less, preferably 3mm or less.

＜19＞

The disposable diaper according to any one of claims < 17 > and < 18 >, wherein when the intermittent portion of the joining adhesive layer is divided into an inner portion and an outer portion with the inner edge of the side sheet as a boundary, the length W4a of the inner portion in the width direction is 0.5mm or more, preferably 1mm or more, and 5mm or less, preferably 3mm or less.

＜20＞

The disposable diaper according to any one of the items < 17 > to < 19 >, wherein when the intermittent portion of the joining adhesive layer is divided into an inner portion and an outer portion with the inner edge of the side sheet as a boundary, the length W4b of the outer portion is 0.5mm or more, preferably 1mm or more, and 5mm or less, preferably 3mm or less.

＜21＞

The disposable diaper according to any one of claims < 17 > to < 20 >, wherein a length W4 in the width direction of the intermittent portion of the adhesive layer for attachment is the same as a length W1 in the width direction of the intermittent portion of the outer layer adhesive layer.

＜22＞

The disposable diaper according to any one of the items < 1 > to < 21 >, wherein the side sheet is a stretchable side sheet having 2 non-stretchable sheets and the elastic member disposed between the 2 non-stretchable sheets in a stretched state.

＜23＞

The disposable diaper according to any of said < 1 > to < 22 >, wherein,

the elastic member disposed on the side sheet is linear,

the width or diameter of the linear elastic member is 0.1mm to 2mm, preferably 0.1mm to 1 mm.

＜24＞

The disposable diaper according to any of said < 1 > to < 23 >, wherein,

the elastic member disposed on the side sheet is linear,

the number of the linear elastic members disposed in the side sheet is about 1 to 25, preferably about 3 to 20.

＜25＞

The disposable diaper according to any one of the above-mentioned items < 1 > to < 24 >, wherein the elastic member disposed on the side sheet is disposed along a width direction of the disposable diaper.

＜26＞

The disposable diaper according to any of said < 1 > to < 25 >, wherein,

a plurality of the elastic members are disposed on the side sheet,

the elastic members in the side sheet are arranged at substantially equal intervals in the longitudinal direction of the disposable diaper.

＜27＞

The disposable diaper according to any one of the above-mentioned items < 1 > to < 26 >, wherein the side sheet is joined to the 2 sheets constituting the side sheet via a plurality of adhesive layers,

the plurality of adhesive layers are each formed to extend in the longitudinal direction of the disposable diaper.

＜28＞

The disposable diaper according to item < 27 > above, wherein,

the plurality of adhesive layers are fixed in an extended state between the 2 sheets via the adhesive constituting each adhesive layer, and the 2 sheets are directly bonded to each other via the adhesive constituting each adhesive layer at a portion where the elastic member is not provided.

＜29＞

The disposable diaper according to < 27 > or < 28 > wherein,

the adhesive layers include: a chassis-side adhesive layer provided on the absorbent chassis side in the direction in which the side sheet extends; a front end side adhesive layer provided on the front end side in the extending direction of the side sheet; and an intermediate adhesive layer provided in a plurality of intermediate regions, which are regions between the main body side adhesive layer and the distal end side adhesive layer in the extending direction of the side sheet,

the intermediate adhesive layer has a width smaller than that of either the main body side adhesive layer or the distal end side adhesive layer, and a plurality of intermediate adhesive layers are formed at intervals in the intermediate region.

＜30＞

The disposable diaper according to any one of the items < 1 > to < 29 >, wherein a reinforcing adhesive layer is formed on each of the two end portions in the width direction of the sheet located on the outer surface side of the side sheet out of the 2 sheets constituting the side sheet.

＜31＞

The disposable diaper according to any one of the items < 1 > to < 30 >, wherein a sheet located on an inner surface side of the side sheet among the 2 sheets constituting the side sheet is not folded back either toward an outer surface side or toward an inner surface side of the sheet located on the inner surface side.

＜32＞

The disposable diaper according to any one of the items < 1 > to < 30 >, wherein, of the 2 sheets constituting the side sheet, the sheet positioned on the outer surface side of the side sheet is folded back at both end portions of the side sheet toward the inner surface side of the sheet positioned on the outer surface side, and the folded-back portions are joined to the inner surfaces of the sheets via reinforcing adhesive layers, respectively.

＜33＞

The disposable diaper according to any one of the items < 30 > to < 32 >, wherein the reinforcing adhesive layers formed at both ends in the width direction of the 2 sheets constituting the side sheet are formed at portions of the sheet located on the outer surface side of the side sheet which are folded back toward the inner surface side.

＜34＞

The disposable diaper according to any one of the items < 30 > to < 33 >, wherein the reinforcing adhesive layer is connected to each of the adhesive layers that join the 2 sheets constituting the side sheet.

＜35＞

The disposable diaper according to any one of the above-mentioned items < 1 > to < 34 >, wherein the skin side sheet has: a dough sheet; and a pair of three-dimensional enclosure forming sheets arranged on the inner surface side in a state where a part of the sheets is overlapped with both side portions in the longitudinal direction of the front sheet,

the connecting adhesive layers are disposed outside and inside the inner edge of the side sheet, and the inner end of the side sheet and the leakproof sheet are joined to each other on the outside and the leakproof sheet and the sheet for forming a three-dimensional enclosure or the topsheet are joined to each other on the inside.

The expression "joining the leakage-preventing sheet to the three-dimensional-enclosure-forming sheet or the front sheet" includes a case where the leakage-preventing sheet and the three-dimensional-enclosure-forming sheet and a case where the leakage-preventing sheet and the front sheet are joined to each other, and also includes a case where the leakage-preventing sheet and the three-dimensional-enclosure-forming sheet and the leakage-preventing sheet and the front sheet are joined to each other.

＜36＞

The disposable diaper according to < 35 > wherein the adhesive layer for joining is spaced apart from the adhesive layer that joins the sheet located on the inner surface side of the side sheet and the sheet for forming the leg cuffs, out of the 2 sheets constituting the side sheet.

[ Industrial Applicability ]

According to the present invention, it is possible to provide a disposable diaper in which the outer composite sheet disposed on the outer surface side of the absorbent main body is less likely to be cracked or broken when the diaper is worn by stretching the fastening tape or the like provided at the front end portion of the side sheet.

Claims

1. A disposable diaper, comprising: an absorbent main body having an absorbent body and an outer composite sheet disposed on the outer surface side of the absorbent body; and side sheets attached to one or both side portions of the absorbent main body, the disposable diaper being characterized in that:

2. The disposable diaper of claim 1, wherein:

the length of the discontinuous portion in the width direction is 1mm or more and 5mm or less.

3. A disposable diaper according to claim 1 or 2, characterized in that:

when the intermittent portion is divided into an inner portion and an outer portion with an inner edge line of the side sheet as a boundary, the length of the inner portion in the width direction is 0.5mm to 5 mm.

4. A disposable diaper according to claim 1 or 2, characterized in that:

when the intermittent portion is divided into an inner portion and an outer portion with an inner edge line of the side sheet as a boundary, the length of the outer portion in the width direction is 0.5mm to 5 mm.

5. A disposable diaper according to claim 1 or 2, characterized in that:

the outer layer adhesive layer has a stripe coating portion in a region overlapping with the inner edge of the side sheet and the vicinity thereof in the thickness direction, the stripe coating portion repeatedly arranging a portion where an adhesive is arranged and a portion where no adhesive is arranged in the width direction, and one of the portions where no adhesive is arranged between the portions where an adhesive is arranged constitutes the intermittent portion.

6. The disposable diaper of claim 5, wherein:

the length of the portion in the width direction where the adhesive is disposed is 0.5mm to 3 mm.

7. The disposable diaper of claim 5, wherein:

the length of the portion in the width direction where the adhesive is disposed is 20% to 100% of the length of the portion where the adhesive is not disposed.

8. The disposable diaper of claim 5, wherein:

the length of the portion in the width direction where no adhesive is disposed is 1mm to 5 mm.

9. A disposable diaper according to claim 1 or 2, characterized in that:

in the outer composite sheet, the shear strength in the width direction between the leakproof sheet and the outer non-woven fabric is greater than the tensile strength in the width direction of the leakproof sheet at a position closer to the outer side than the inner edge of the side sheet.

10. A disposable diaper according to claim 1 or 2, characterized in that:

the outer layer nonwoven fabric has a tensile strength in the width direction greater than that of the leakproof sheet.

11. A disposable diaper according to claim 1 or 2, characterized in that:

the tensile strength of the leakproof sheet in the width direction is more than 100cN/25mm and less than 400cN/25 mm.

12. A disposable diaper according to claim 1 or 2, characterized in that:

the outer layer nonwoven fabric has a tensile strength of 300cN/25mm or more and 1000cN/25mm or less in the width direction.

13. A disposable diaper according to claim 1 or 2, characterized in that:

an outer edge of the leakproof sheet is positioned at a position which is more outside than an inner edge of the side sheet and is positioned more inside than an outer edge of the outer layer non-woven fabric in the width direction,

14. The disposable diaper of claim 13, wherein:

the length of the extension of the outer layer nonwoven fabric in the width direction is 5mm or more and 30mm or less.

15. The disposable diaper of claim 13, wherein:

the connecting adhesive layer has an extension adhesive part for joining the inner end part of the side sheet and the extension part of the outer layer nonwoven fabric,

the length of the extended adhesive portion in the adhesive layer for connection is 30% to 100% of the length of the extended portion of the outer layer nonwoven fabric.

16. The disposable diaper of claim 13, wherein:

the length of the extended adhesive portion in the adhesive layer for connection is 3mm to 20 mm.

17. A disposable diaper according to claim 1 or 2, characterized in that:

the connecting adhesive layer has a discontinuous portion where no adhesive is disposed at a position overlapping the inner edge of the side sheet in the thickness direction.

18. The disposable diaper of claim 17, wherein:

the length of the discontinuous portion of the adhesive layer for connection in the width direction is 1mm or more and 5mm or less.

19. The disposable diaper of claim 17, wherein:

when the intermittent portion of the joining adhesive layer is divided into an inner portion and an outer portion with the inner edge of the side sheet as a boundary, the length of the inner portion in the width direction is 0.5mm to 5 mm.

20. The disposable diaper of claim 17, wherein:

when the intermittent portion of the joining adhesive layer is divided into an inner portion and an outer portion with the inner edge of the side sheet as a boundary, the length of the outer portion in the width direction is 0.5mm to 5 mm.

21. The disposable diaper of claim 17, wherein:

the length of the discontinuous portion of the adhesive layer for connection in the width direction is the same as the length of the discontinuous portion of the outer layer adhesive layer in the width direction.

22. A disposable diaper according to claim 1 or 2, characterized in that:

the side sheet is a stretchable side sheet having 2 non-stretchable sheets and the elastic member disposed between the 2 non-stretchable sheets in a stretched state.

23. A disposable diaper according to claim 1 or 2, characterized in that:

the elastic member disposed on the side sheet is linear,

the width or diameter of the linear elastic member is 0.1mm to 2 mm.

24. A disposable diaper according to claim 1 or 2, characterized in that:

the elastic member disposed on the side sheet is linear,

the number of the linear elastic members disposed on the side sheet is 1 to 25.

25. A disposable diaper according to claim 1 or 2, characterized in that:

the elastic member disposed on the side sheet is disposed along the width direction of the disposable diaper.

26. A disposable diaper according to claim 1 or 2, characterized in that:

a plurality of the elastic members are disposed on the side sheet,

27. A disposable diaper according to claim 1 or 2, characterized in that:

the 2 sheets constituting the side sheet are bonded to each other via a plurality of adhesive layers,

the adhesive layers are each formed to extend in the longitudinal direction of the disposable diaper.

28. The disposable diaper of claim 27 wherein:

in the plurality of adhesive layers, the plurality of elastic members are fixed in an extended state between the 2 sheets via an adhesive constituting each of the plurality of adhesive layers, and the 2 sheets are directly bonded to each other via the adhesive constituting each of the plurality of adhesive layers at a portion where the elastic members are not provided.

29. The disposable diaper of claim 27 wherein:

30. A disposable diaper according to claim 1 or 2, characterized in that:

reinforcing adhesive layers are formed on both ends in the width direction of a sheet located on the outer surface side of the side sheet out of the 2 sheets constituting the side sheet.

31. A disposable diaper according to claim 1 or 2, characterized in that:

of the 2 pieces constituting the side sheet, the piece located on the inner surface side of the side sheet is not folded back either to the outer surface side or to the inner surface side of the piece located on the inner surface side.

32. The disposable diaper of claim 30 wherein:

of the 2 pieces constituting the side sheet, the piece positioned on the outer surface side of the side sheet is folded back at both end portions of the side sheet toward the inner surface side of the piece positioned on the outer surface side, and the folded-back portions are bonded to the inner surfaces of the pieces via reinforcing adhesive layers, respectively.

33. The disposable diaper of claim 30 wherein:

the reinforcing adhesive layers formed at both ends in the width direction of the 2 pieces constituting the side sheet are formed at portions of the outer surface side of the side sheet which are folded back toward the inner surface side.

34. The disposable diaper of claim 30 wherein:

the reinforcing adhesive layer is connected to the adhesive layer that bonds the 2 sheets constituting the side sheet.

35. A disposable diaper according to claim 1 or 2, characterized in that:

the skin side sheet has: a dough sheet; and a pair of three-dimensional enclosure forming sheets arranged on the inner surface side in a state where a part of the sheets is overlapped with both side portions in the longitudinal direction of the front sheet,

36. The disposable diaper of claim 35 wherein:

the adhesive layer for connection is spaced apart from an adhesive layer that bonds a sheet located on the inner surface side of the side sheet and a sheet for forming a three-dimensional enclosure, among the 2 sheets constituting the side sheet.