JP2012213574A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper which can be formed easily and in which the stomach side and buttock side thereof have excellent fitting properties.SOLUTION: The trunks-type disposable diaper 1 includes: an outer cover sheet 2, an absorption body 3, and a liquid impermeable leakage prevention sheet 4 provided between the outer cover sheet 2 and the absorption body 3, and includes a waist opening 8 and a pair of leg-surrounding openings 9. The disposable diaper 1 is characterized in that the rear crotch region has a pleat 7 which is formed either by forming a protrusion section protruding to the clothing side and affixing the side edges of the protrusion section to the outer cover sheet 2, the protrusion section being formed by folding a part of the outer cover sheet 2 in such a manner that the skin surface-side portions of the part of the same face each other, or by forming a protrusion section protruding to the skin surface side and affixing the side edges of the protrusion section to the outer cover sheet 2, the protrusion section being formed by folding a part of the outer cover sheet 2 in such a manner that the clothing-side portions of the part of the same face each other.

Description

  The present invention relates to a disposable diaper. In particular, the present invention relates to a disposable diaper having a fold or gear extension region formed in the rear crotch region, which can be easily formed and has excellent fit on the stomach side and the buttock side.

A trunk-shaped disposable diaper is known as a disposable diaper.
For example, Patent Document 1 includes a back sheet, an absorber, and a top sheet, and is formed by folding the center portion in the longitudinal direction of the back sheet in a folded manner on the top sheet side along the width direction. A folded portion, a joined portion in which the longitudinal side ends of the backsheet are joined together, a waist opening formed at both longitudinal ends of the backsheet and positioned around the waist of the human body when worn, and the folded There is disclosed an absorbent article characterized by comprising two leg-hole openings that are formed around the above-described absorbent body and positioned around the legs of a human body when worn. As is apparent from FIG. 2 and the like, the absorbent article shown in Patent Document 1 has a symmetric shape between the shape of the front body and the shape of the back body.

  Further, in Patent Document 2, both sides of the front body and both sides of the back body of a pant body composed of a top sheet, a back sheet, and a water-absorbent core are bonded to each other so In the integrated pants-type paper diaper, which is formed with an opening and leg holes on the left and right sides of the lower part, obliquely toward each side edge from a location that is appropriately away from the longitudinal center line of the front body There is disclosed a disposable paper diaper characterized in that it is provided with a slit for forming a leg hole provided on the disposable diaper.

JP 2005-110990 Japanese Patent Laid-Open No. 3-176052

However, although the shape of the front body and the shape of the back body of the absorbent article described in Patent Document 1 are symmetrical, generally, humans have a larger buttocks side than the stomach side, Problems such as the outer sheet sticking to the buttock, the outer sheet biting into the center of the buttock, and the space for storing excrement are lost. On the other hand, if an absorbent article is formed large according to the buttocks side, a large surplus part will arise on the stomach side. Moreover, in the disposable diaper described in Patent Document 2, since the slit for forming the leg hole is formed in the front body, the appearance of the rear part of the leg hole part where the front and rear waist gathers are shifted at the time of wearing. Problems such as formation of a surplus part to be deteriorated occur.
Therefore, an object of this invention is to provide the disposable diaper which can be formed easily and is excellent in the fit property of the stomach side and the buttocks side.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors include an exterior sheet, an absorbent body, and a liquid-impermeable leak-proof sheet between the exterior sheet and the absorbent body. A trunks-shaped disposable diaper having a waistline opening and a pair of leghole openings, wherein the front body of the disposable diaper has a front waistline region including an elastic member and a front crotch region, and the disposable diaper The back body has a rear waistline region including an elastic member and a rear inseam region, and the waistline opening is formed by joining a side edge of the front waistline region and a side edge of the rear waistline region. And the pair of leg hole openings are formed by joining the side edge of the front crotch region and the side edge of the rear crotch region, and the rear crotch region is formed of the exterior sheet. Part of the skin face side of each other The protrusions projecting toward the clothing side are formed by folding them together, and the side edges of the protrusions are fixed to the exterior sheet, or a part of the exterior sheet faces the clothing side facing each other. A disposable diaper having a pleat formed by forming a protruding portion protruding to the skin surface side by being folded onto the skin and fixing a side edge of the protruding portion to the exterior sheet Thus, the inventors have found that the above-described problems can be solved, and have completed the present invention.

Specifically, the present invention relates to the following aspects.
[Aspect 1]
A trunks-shaped disposable diaper including an exterior sheet, an absorbent body, and a liquid-impervious leak-proof sheet between the exterior sheet and the absorbent body, and having one waistline opening and a pair of leg-hole openings Because
The front body of the disposable diaper has a front waistline region including an elastic member and a front crotch region, and the back body of the disposable diaper has a rear waistline region including a resilient member and a back crotch region. The side waist of the front waistline and the side edge of the rear waistline are joined to form the waistline opening, and the side edge of the front waistline and the side edge of the rear waistline are The pair of leg openings are formed by joining,
The rear crotch region forms a protruding portion protruding toward the clothing side by folding a part of the exterior sheet so that the skin side faces each other, and the side edge of the protruding portion is Fixing to the exterior sheet or folding a part of the exterior sheet so that the clothing side faces each other, thereby forming a projecting portion protruding to the skin surface side, and the side edge of the projecting portion Formed by fixing to the exterior sheet, having pleats,
The said disposable diaper characterized by the above-mentioned.

[Aspect 2]
The protruding portion that protrudes toward the clothing side is fixed to the exterior sheet such that the tip thereof faces the leg opening portion side, or the protruding portion that protrudes toward the skin surface side The disposable diaper according to aspect 1, which is fixed to the exterior sheet so as to face the waistline opening side.
[Aspect 3]
The aspect 1 or the side edge of the said protrusion part is being fixed to the junction part formed by joining the side edge of the said front crotch region, and the side edge of a rear crotch region of the said exterior sheet | seat The disposable diaper according to 2.

[Aspect 4]
The absorbent body is in contact with the pleats and a lower region located below the pleats when worn, with the liquid-impermeable leak-proof sheet interposed therebetween, among the exterior sheets of the back body. However, in the outer sheet of the back body, the absorber is located above the pleats when worn, with the liquid-impermeable leak-proof sheet sandwiched therebetween or liquid-impermeable. The disposable diaper according to any one of aspects 1 to 3, wherein the leak-proof sheet is not in contact without being sandwiched therebetween.

[Aspect 5]
In the outer sheet of the back body, the absorbent body includes the pleats, a lower region located below the pleats when worn, and an upper region located above the pleats when worn. The absorbent body is in contact with the liquid impervious sheet, or the liquid impervious leak preventer sheet is interposed between the absorbent body and the liquid impervious leak preventer sheet. The disposable diaper according to any one of aspects 1 to 3, which is not fixed to the upper region.
[Aspect 6]
The disposable diaper according to any one of aspects 1 to 3, wherein a length of the diaper in the longitudinal direction of the disposable diaper is 5 to 40 mm.

[Aspect 7]
A trunks-shaped disposable diaper including an exterior sheet, an absorbent body, and a liquid-impervious leak-proof sheet between the exterior sheet and the absorbent body, and having one waistline opening and a pair of leg-hole openings Because
The front body of the disposable diaper has a front waistline region including an elastic member and a front crotch region, and the back body of the disposable diaper has a rear waistline region including a resilient member and a back crotch region. The side waist of the front waistline and the side edge of the rear waistline are joined to form the waistline opening, and the side edge of the front waistline and the side edge of the rear waistline are The pair of leg openings are formed by joining,
In the rear crotch region, a pair of gear rolls are formed by passing at least the exterior sheet through a gap between the gear rolls that rotate while meshing a plurality of teeth arranged on the outer peripheral surfaces of the gear rolls. A gear extension region is formed,
The said disposable diaper characterized by the above-mentioned.

[Aspect 8]
The outer stretch sheet and the liquid-impervious leak-proof sheet are provided in a gap between the gear extension region, which is a pair of gear rolls and rotates while meshing a plurality of teeth arranged on the outer peripheral surfaces of the gear rolls. The disposable diaper of aspect 7 formed by letting pass.
[Aspect 9]
The disposable diaper according to aspect 7 or 8, wherein the gear extending region is formed by extending the exterior sheet in at least the width direction of the disposable diaper.

[Aspect 10]
The disposable diaper according to any one of aspects 7 to 9, wherein the gear stretching region is formed by stretching the exterior sheet at least in the longitudinal direction when the disposable diaper is deployed.
[Aspect 11]
The disposable diaper according to any one of aspects 7 to 10, wherein the absorber is not fixed to the exterior sheet in the gear extension region.

[Aspect 12]
The disposable diaper according to any one of aspects 1 to 11, wherein an area of the rear body of the exterior sheet is 10 to 30% larger than an area of the front body of the exterior sheet.

  The disposable diaper of the present invention can be easily formed and has excellent fit on the stomach side and the buttock side.

FIG. 1 is a perspective view of one embodiment of the disposable diaper of the present invention. FIG. 2 is a development view of the disposable diaper 1 shown in FIG. 1. FIG. 3 is a view showing the XX cross section and the YY cross section of the disposable diaper 1 shown in FIG. 2. FIG. 4 is a cross-sectional view showing another embodiment of the disposable diaper of the present invention. FIG. 5 is a cross-sectional view showing another embodiment of the disposable diaper of the present invention. FIG. 6 is a development view showing another embodiment of the disposable diaper of the present invention. FIG. 7 is a view showing a YY cross section of the disposable diaper 1 shown in FIG. 6. FIG. 8 is a diagram showing an example of an exterior sheet used in the present invention. FIG. 9 is a diagram showing an example of an exterior sheet used in the present invention. FIG. 10 is an exploded view of an embodiment in which the disposable diaper of the present invention has a gear extension region. 11 is a diagram showing a YY cross section of FIG. 12 is a diagram showing a ZZ cross section of FIG. 10. FIG. 13 is a schematic diagram for explaining gear stretching. FIG. 14 is a schematic diagram for explaining gear stretching. FIG. 15 is a schematic diagram for explaining gear stretching. FIG. 16 is a development view showing another embodiment of the present invention. FIG. 17 is a view showing a YY cross section of the disposable diaper 1 shown in FIG. 16. FIG. 18 is a development view of another embodiment of the disposable diaper of the present invention. FIG. 19 is a development view of another embodiment of the disposable diaper of the present invention.

Hereinafter, the disposable diaper of the present invention will be described in detail.
FIG. 1 is a perspective view of one embodiment of the disposable diaper of the present invention. A disposable diaper 1 shown in FIG. 1 includes an exterior sheet 2, an absorber 3, and a liquid-impervious leak-proof sheet 4, and includes one waistline opening 8 and a pair of leg-hole openings 9. It has a trunk shape.

  In general, a trunk-shaped disposable diaper is designed such that a leg opening is in close contact with a user's leg, for example, a thigh, and does not leak urine or the like. Accordingly, an expansion / contraction member is generally disposed in the leg opening, but the expansion / contraction member is omitted in the specification and the accompanying drawings in order to simplify the description. In addition, the leg opening may be designed so as not to leak urine or the like by forming the leg opening slightly tightly from the extensible member, but it is omitted in the present specification and the accompanying drawings as well. ing.

FIG. 2 is a development view of the disposable diaper 1 shown in FIG. 1. Drawing 2 is a figure which looked at disposable diaper 1 from the skin side.
In this specification, “skin side” means a side that touches the user's skin, and “clothing side” means a side that touches clothing.

  In the disposable diaper 1 shown in FIG. 2, the front body F has a front waistline region FW including a plurality of elastic members 6F and a front crotch region FC, and the back body R includes a plurality of elastic members 6R. The rear waistline region RW and the rear crotch region RC are included, and the side edge of the front waistline region FW and the side edge of the rear waistline region RW are joined at the joint portion J, whereby the waistline opening 8 Then, the side edge of the front crotch region FC and the side edge of the rear crotch region RC are joined at the joint J, whereby a pair of leg opening 9 is formed.

In the disposable diaper 1 shown in FIG. 2, the rear crotch region RC folds a part of the exterior sheet 2 so that the skin surface side 10 faces each other, thereby protruding to the clothing side 11 ( More specifically, the side edges of the front crotch region FC of the exterior sheet 2 are formed by fixing the side edges of the protrusions to the exterior sheet 2. A pleat 7 having a three-layer structure is formed by fixing to a joint portion J formed by joining the side edges of the crotch region RC.
In the disposable diaper 1 shown in FIG. 2, the protruding portion (not shown) is not fixed to the exterior sheet 2 except for the joint portion J.

  In FIG. 2, the liquid-impermeable leak-proof sheet 4 is described as being slightly larger than the absorber 3 and partially overlapping with the pleats 7. However, in the disposable diaper of the present invention, the liquid-impermeable sheet If the leakproof sheet is arranged so as to cover the area where the absorber exists between the absorbent body and the exterior sheet, the size is not particularly limited, and the liquid-impervious leakproof sheet is Further, it may be arranged on the entire surface of the exterior sheet. In the case where the pleat functions as an excrement receiving portion described later, it is preferable that a liquid-impermeable leak-proof sheet is disposed over the entire pleat in order to prevent the excrement from leaking. Also in other embodiment of this invention, arrangement | positioning of a liquid-impermeable leak-proof sheet has the same tendency.

  FIG. 3 is a view showing the XX cross section and the YY cross section of the disposable diaper 1 shown in FIG. 2. 3A shows an XX cross section, and FIG. 3B shows a YY cross section. In FIG. 3A, the protruding portion 5 is formed by folding a part of the exterior sheet 2 so that the skin surface side 10 faces each other, and the inside of the protruding portion 5 is bonded to the side edge. While being fixed by the part 12 '', the side edge of the protruding part 5 is further fixed to the joint J of the exterior sheet 2 by the adhesive part 12 '. In FIG. 3A, the ridge 7 is formed by further fixing the protrusion 5 to the exterior sheet 2 so that the tip 5 ′ of the protrusion faces the leg opening 9 side. . In FIG. 3A, the absorbent body 3 is also fixed to the exterior sheet 2 by the adhesive portion 12.

  In the present specification, a pleat means a region where the exterior sheet has at least a three-layer structure and at least two layers are fixed at the side edge of the exterior sheet. In the case of FIG. 3 (A), in the pleat 7, the three-layer exterior sheet 2 is fixed by the adhesive portions 12 ′ and 12 ″. be able to. The pleats may be formed from an exterior sheet and a liquid-impervious leak-proof sheet. If the sheet has at least a three-layer structure, the liquid-impervious leak-proof sheet is used. Even those sandwiched between them are called folds.

  In the disposable diaper of the present invention, the width at which the inside is fixed at the side edge of the protruding portion, and the width at which the side edge of the protruding portion is fixed to the joint portion of the exterior sheet is about 5 to about 15 mm and usually about 10 mm. If the width is narrow, the fixing may be insufficient. If the width is large, the fixing force increases, but the fit on the heel side may decrease. Also in the following embodiments, the width has the same tendency.

  In FIG. 3 (B), since the inside of the projecting portion 5 is not fixed and the projecting portion 5 is not fixed to the exterior sheet 2, the pleat 7 spreads according to the shape of the user's buttocks. Can do. Therefore, the disposable diaper as shown in FIG. 3 is excellent in the fit on the buttock side. Further, in the disposable diaper shown in FIG. 3, as shown in FIG. 3 (B), since the tip 5 ′ of the protruding portion faces the leg opening 9 side, the pleats 7 are stool, urine, etc. Since it functions as the excretion receiving part 13 which hold | maintains this excrement temporarily and then transfers to the absorber 3, the leakage of excrement can be decreased.

In FIG. 3, the elastic members 6 </ b> F and 6 </ b> R are described as being embedded in the exterior sheet 2 in order to simplify the description, but as an example, the exterior is composed of two layers of nonwoven fabric. An example in which the elastic members 6F and 6R are fixed between the sheets by an adhesive or the like can be given.
Further, in FIG. 3B, the liquid-impermeable leak-proof sheet 4 is fixed to the exterior sheet 2 by an adhesive portion, but the adhesive portion is omitted for the sake of simplicity of explanation.
Further, in FIG. 3B, the absorbent body 3 is fixed to the exterior sheet 2 via the liquid-impervious leak-proof sheet 4, but in this specification, the absorbent body is liquid-impermeable. The fact that the absorbent body is fixed to the exterior sheet via the leak-proof sheet is sometimes simply referred to as the absorber being fixed to the exterior sheet.

  In the present specification, the “circumference region” means two regions at the end in the longitudinal direction when the disposable diaper is divided into four equal parts in the longitudinal direction when the disposable diaper of the present invention is developed. Specifically, the region of the longitudinal end portion on the front body side is the front waistline region, and the region of the longitudinal end portion on the back body side is the back waistline region. An elastic member for fitting a disposable diaper to a user's torso usually exists in the waist area.

Further, in the present specification, “inseam area” means two regions at the center in the longitudinal direction when the disposable diaper is divided into four equal parts in the longitudinal direction in a state where the disposable diaper of the present invention is developed. Specifically, the center region on the front body side is the front crotch region, and the middle new region on the back body side is the rear crotch region.
In consideration of the fact that the disposable diaper of the present invention has a pleat or a gear extension region, it is preferable to measure the four equal parts at the side edge in the longitudinal direction of the disposable diaper.

In the present specification, unless otherwise specified, the “longitudinal direction” means the longitudinal direction when the disposable diaper of the present invention is deployed, that is, the direction that becomes the front-rear direction of the user when worn, and the “width direction” means Unless otherwise specified, it means the width direction of the disposable diaper of the present invention, that is, the direction that is the left-right direction of the user when worn.
Furthermore, in the present invention, the “side edge” means the edge in the width direction of the disposable diaper, for example, the side edge of the exterior sheet means the side edge in the width direction of the exterior sheet, and the side edge of the pleat is It means the side edge of the pleat in the width direction.

  In the disposable diaper 1 shown in FIG. 1, a part of the exterior sheet 2 is folded so that the skin surface side 10 faces each other, thereby forming the protruding part 5 protruding to the clothing side 11 and the protruding part. 5 is further fixed to the exterior sheet 2 so that the tip 5 ′ of the protruding portion faces the leg opening 9 side. In the disposable diaper of the present invention, the protruding portion The direction of is not particularly limited, and in another embodiment of the present invention, the protrusion may be formed as a pleat by fixing it to the exterior sheet so that the tip thereof faces the waistline opening side.

Moreover, the said protruding part may be formed so that it may protrude to the skin surface side.
FIG. 4 is a cross-sectional view showing another embodiment of the disposable diaper of the present invention. 4A is a cross-sectional view corresponding to the XX cross section of FIG. 2, and FIG. 4B is a cross-sectional view corresponding to the YY cross section of FIG. In the disposable diaper 1 shown in FIG. 4, a part of the outer sheet 2 is folded so that the clothing side 11 faces each other, thereby forming a protruding part 5 protruding to the skin surface side 10. The pleats 7 are formed by fixing the side edges of 5 to the exterior sheet 2. In the disposable diaper 1 shown in FIG. 4, the protruding portion 5 protruding to the skin side 10 is fixed to the exterior sheet 2 so that the tip 5 ′ of the protruding portion faces the waistline opening (not shown). Has been. Except for the above, the disposable diaper 1 shown in FIG. 4 is the same as the disposable diaper 1 shown in FIG. 3.

  In FIG. 4 (B), since the inside of the projecting portion 5 is not fixed and the projecting portion 5 is not fixed to the exterior sheet 2, the pleat 7 spreads according to the shape of the user's buttocks. Can do. Therefore, the disposable diaper as shown in FIG. 4 is excellent in the fit on the buttock side. In the embodiment shown in FIG. 4, as shown in FIG. 4B, the second tip 5 ″ of the projecting portion faces the leg opening 9 side. Since it functions as the excretion receiving unit 13 that temporarily retains excrement such as stool and urine and then transfers it to the absorber, leakage of excrement can be reduced.

As described above, in the embodiment shown in FIG. 3 and the embodiment shown in FIG. 4, the procedure for forming the pleats is different. However, both of the manufactured disposable diapers have leg portions on the clothing side. Since it has the same shape in the point which faces the rotation opening part, and has the same effect | action, the outstanding fitting property by the side of a buttock, and an excretion receiving part, both can be equated.
Further, in another embodiment of the present invention, a ridge that protrudes toward the skin surface side may be pleated by being fixed to the exterior sheet so that the tip thereof faces the leg opening portion side. .

  In the embodiment shown in FIGS. 1 to 4, the inside of the protruding portion, and the protruding portion and the outer sheet have been fixed by the adhesive portion, but in the present invention, the fixing means is not particularly limited, and these are: For example, you may be fixed by the pressing part.

FIG. 5: is sectional drawing which shows another embodiment of the disposable diaper of this invention to which the inside of a protrusion part, and a protrusion part and an outer surface sheet are being fixed by the pressing part. 5A is a cross-sectional view corresponding to the XX cross section of FIG. 2, and FIG. 5B is a cross-sectional view corresponding to the YY cross section of FIG.
In FIG. 5A, a part of the outer sheet 2 is folded twice, a three-layer structure part is formed on a part of the outer sheet 2, and the three-layer structure part is squeezed together so that the pleats 7 are formed. Is formed. In FIG. 5, the code | symbol 14 means a pressing part. FIG. 5B showing a cross section of the central region in the longitudinal direction is the same as FIGS. 3B and 4B.

  The embodiment shown in FIG. 5 has the same shape as the disposable diaper shown in FIGS. 3 and 4 in that the protrusion on the clothing side faces the leg opening, and the same Since it has an effect | action, the outstanding fitting property by the side of a buttock, and an excretion receiving part, these can be equated.

  From the above, after the pleats are formed, the pleats are considered to have a protruding part on the clothing side and a protruding part on the skin side facing the opposite side of the protruding part on the clothing side. There are two types of pleats: one with the protrusion on the clothing side facing the leg opening (the one with the skin surface facing the waist opening) and one on the clothing side. There are two examples: one in which the shape portion faces the waistline opening (the one in which the skin-side protruding portion faces the leghole opening).

  Since FIG. 5 is a further sectional view of the development view of the disposable diaper, it is described that the pleats 7 are formed by squeezing the three-layer structure portion of the exterior sheet together, but the present invention. In the disposable diaper, the four layers obtained by adding the front crotch region of the outer sheet to the three-layer structure portion of the outer sheet are squeezed in a lump, and the side edges of the front crotch region and the rear crotch region A joint formed by joining the side edges can be formed simultaneously.

  In the embodiment shown in FIG. 1 to FIG. 3, the side edge of the protruding portion is fixed to a joint portion formed by joining the side edge of the front crotch region and the side edge of the rear crotch region. However, in the disposable diaper of the present invention, the present invention is not limited to this embodiment, and the present invention is configured such that the side edges of the projecting portion are the side edges of the front crotch region and the rear crotch region as shown in FIG. Also included is an embodiment in which the side edges are fixed in addition to the joints formed by joining.

FIG. 6 is a development view showing another embodiment of the disposable diaper of the present invention.
FIG. 6 is a development view of the disposable diaper 1 and is a view of the disposable diaper 1 as seen from the skin surface side. The disposable diaper 1 shown in FIG. 6 includes an exterior sheet 2, an absorbent body 3, and a liquid-impervious leak-proof sheet 4, and includes one waistline opening 8 and a pair of leg-hole openings 9. It has a trunk shape.

  In the disposable diaper 1 shown in FIG. 6, the front body F has a front waistline region FW including a plurality of elastic members 6F and a front crotch region FC, and the back body R includes a plurality of elastic members 6R. The rear waistline region RW and the rear crotch region RC are included, and the side edge of the front waistline region FW and the side edge of the rear waistline region RW are joined at the joint portion J, whereby the waistline opening 8 Then, the side edge of the front crotch region FC and the side edge of the rear crotch region RC are joined at the joint J, whereby a pair of leg opening 9 is formed.

  In the disposable diaper 1 shown in FIG. 6, in the rear crotch region RC, a part of the exterior sheet 2 is folded so that the skin surface side 10 faces each other, thereby protruding to the clothing side 11 ( A pleat 7 is formed by fixing the side edge of the protruding portion to the side edge of the exterior sheet 2 in the rear crotch region RC by the adhesive portion 12. In addition, in the disposable diaper 1 shown by FIG. 6, the said protruding part (not shown) is not being fixed in parts other than an exterior sheet and its side edge.

  FIG. 7 is a view showing a YY cross section of the disposable diaper 1 shown in FIG. 6. As shown in FIG. 7, in the central region in the longitudinal direction, the inside of the protruding portion 5 is not fixed and the protruding portion 5 is not fixed to the exterior sheet 2. It can spread according to the shape of the buttocks. Therefore, the disposable diaper as shown in FIG. 7 is excellent in the fit on the buttock side. Further, in the disposable diaper 1 shown in FIG. 7, since the tip 5 ′ of the projecting portion faces the leg opening 9 side, the pleat 7 temporarily holds excrement such as feces and urine, Next, since it functions as the excretion receiving part 13 to which it transfers to an absorber, the leakage of excrement can be decreased.

  In an embodiment in which the range of the absorbent body and the range of pleats overlap in the thickness direction of the disposable diaper, as shown in FIG. It is preferable that the sheet is not fixed to two or more non-continuous regions of the exterior sheet both when the leakage sheet is interposed and when the liquid-impermeable leakage-proof sheet is not interposed. This is because if the absorber is fixed to two or more non-continuous regions of the exterior sheet, the spread of folds may be hindered.

In the disposable diaper having pleats of the present invention, the outer sheet has been described as being formed from a single material, but the outer sheet may be formed from a single material, Or you may form from the several raw material.
FIG. 8 is a diagram showing an example of an exterior sheet used in the present invention. FIG. 8 is a view of the exterior sheet 2 as viewed from the skin surface side. The exterior sheet 2 shown in FIG. 8 is further divided into an exterior sheet 2a and a leg periphery sheet 2b. The leg periphery sheet 2b is arranged at the center in the longitudinal direction A so as to surround the pair of leg periphery openings 9. Yes. In FIG. 8, the elastic members 6F and 6R and the pleats 7 are also shown.

  FIG. 9 is a diagram showing an example of an exterior sheet used in the present invention. FIG. 9 is a view of the exterior sheet 2 as seen from the skin side. The exterior sheet 2 shown in FIG. 9 is further divided into an exterior sheet 2a and a leg periphery sheet 2b. The leg periphery sheet 2b is composed of two parts, and each is arranged so as to surround the leg periphery opening 9. Yes. In FIG. 9, the elastic members 6F and 6R and the pleats 7 are also shown.

Here, the range which fixes the absorber in the disposable diaper of this invention to an exterior sheet | seat on both sides of a leak-proof sheet | seat is demonstrated.
FIG. 18 is a development view of an embodiment of the disposable diaper of the present invention. The disposable diaper 1 shown in FIG. 18 is the same as the disposable diaper shown in FIG. 2 except for the absorber 3 and the liquid-impervious leak-proof sheet 4. Further, in the disposable diaper 1 shown in FIG. 18, the protruding portion (not shown) is further fixed to the exterior sheet 2 so that the tip (not shown) of the protruding portion faces the leg opening 9 side. As a result, the pleats 7 are formed.

In the disposable diaper 1 shown in FIG. 18, the absorbent body 3 is a liquid-impermeable preventive in the pleat 7 and the lower region RD located below the pleat 7 when worn on the exterior sheet 2 of the back body R. Although the leaking sheet 4 is sandwiched between the absorbent sheet 3 and the outer sheet 3 of the back body R, the liquid-impermeable leak-proof sheet is disposed in the upper region RU located above the pleats 7 when worn. 4 is not in contact with the liquid-impervious leak-proof sheet 4 in between. In the embodiment as shown in FIG. 18, since the absorbent body is in contact with the pleats, when the absorbent body absorbs the liquid and becomes heavier, the folded pleats 7 are unfolded, and the excreta receiving part. Can function as.
In the disposable diaper as shown in FIG. 18, the absorber may be fixed to the pleats with a liquid-impermeable leak-proof sheet interposed therebetween, or may not be fixed.

  FIG. 19 is a development view of one embodiment of the disposable diaper of the present invention. The disposable diaper 1 shown in FIG. 19 is the same as the disposable diaper shown in FIG. 2 except for the absorber 3 and the liquid-impervious leak-proof sheet 4. Further, in the disposable diaper 1 shown in FIG. 19, the protruding portion (not shown) is further fixed to the exterior sheet 2 so that the tip (not shown) of the protruding portion faces the leg opening 9 side. As a result, the pleats 7 are formed.

In the disposable diaper 1 shown in FIG. 19, the absorbent body 3 has a pleat 7, a lower region RD located below the pleat 7 when worn, and a fold 7 above the pleat 7 when worn. The upper region RU located is in contact with the liquid impervious leakproof sheet 4 sandwiched therebetween, but the absorber 3 sandwiches the liquid impervious leakproof sheet 4 in between or the liquid impervious. The leakproof sheet 4 is not fixed to the upper region RU without interposing it.
If the absorbent body is fixed to the upper region with or without a liquid-impermeable leak-proof sheet, the pleats cannot be developed.
In the disposable diaper as shown in FIG. 19, the absorbent body may be fixed to the pleat with a liquid-impermeable leak-proof sheet interposed therebetween, or may not be fixed.

  In addition to the embodiment shown in FIGS. 18 and 19, as an embodiment of the disposable diaper of the present invention, as shown in FIG. 2, the absorbent body 3 is worn among the exterior sheets 2 of the back body R. Sometimes the lower region (not shown) located below the pleats 7 is in contact with the liquid-impermeable leak-proof sheet 4 sandwiched therebetween, but the absorber 3 is included in the exterior sheet 2 of the back body R. The pleat 7 and the upper region RU located above the pleat 7 when worn are in contact with the liquid-impermeable leak-proof sheet 4 interposed therebetween or without the liquid-impermeable leak-proof sheet 4 interposed therebetween. Embodiments that are not included are also within the scope.

The longitudinal length of the pleats of the disposable diaper is preferably about 5 to about 40 mm, more preferably about 10 to about 35 mm, and even more preferably about 15 to about 30 mm. When the length is less than about 5 mm, the size difference between the wearer's stomach side and the buttocks side may not be supported, and when the length exceeds about 40 mm, the disposable diaper accepts excrement and is heavy. When this happens, the projecting portion may swell greatly, and the appearance may deteriorate, the wearer may feel uncomfortable, or there may be problems such as leakage from the gap between the disposable diaper and the body.
In addition, in this specification, the length of the longitudinal direction of the disposable diaper of the pleat is the length of the longitudinal direction of the disposable diaper of the part by which at least 3 layers of exterior sheets are laminated | stacked shown by L in FIG. means.

  The location of the pleat is not particularly limited as long as it exists in the rear waistline region and reaches both sides of the exterior sheet. Further, a part of the pleat may be present in a waistline opening having an elastic member. However, since the waistline opening functions so as to be in close contact with the user's body by the elastic member, the effect may not be exhibited when the majority of the pleats are present in the waistline opening.

Although the embodiment of the disposable diaper of the present invention having pleats has been described with reference to FIGS. 1 to 7, the disposable diaper of the present invention has an embodiment having a gear extension region in addition to the embodiment of having pleats. including.
FIG. 10 is an exploded view of an embodiment in which the disposable diaper of the present invention has a gear extension region. Drawing 10 is a figure which looked at disposable diaper 1 from the skin side. The disposable diaper 1 shown in FIG. 10 includes an exterior sheet 2, an absorbent body 3, and a liquid-impermeable leak-proof sheet 4, and includes one waistline opening 8 and a pair of leg-hole openings 9. It has a trunk shape.

  In the disposable diaper 1 shown in FIG. 10, the front body F has a front waistline region FW including a plurality of elastic members 6F and a front crotch region FC, and the back body R includes a plurality of elastic members 6R. The rear waistline region RW and the rear crotch region RC are included, and the side edge of the front waistline region FW and the side edge of the rear waistline region RW are joined at the joint portion J, whereby the waistline opening 8 Then, the side edge of the front crotch region FC and the side edge of the rear crotch region RC are joined at the joint J, whereby a pair of leg opening 9 is formed.

  In the disposable diaper 1 shown in FIG. 10, the exterior sheet 2 is a pair of gear rolls in the rear crotch region RC and rotates while meshing a plurality of teeth arranged on the respective outer peripheral surfaces of the gear rolls. A gear extension region 15 formed by passing through a gap between the objects is formed.

11 is a diagram showing a YY cross section of FIG. In FIG. 11, the outer sheet 2 is stretched at the gear stretching region 15 to form a recess 16 that can follow the user's buttocks.
12 is a diagram showing a ZZ cross section of FIG. 10. In FIG. 12, the outer sheet 2 is stretched at the gear stretching region 15 to form a recess 16 that can follow the user's buttocks.

  The said gear extending | stretching area | region can be formed using the following gear extending | stretching apparatuses. In the present specification, stretching the exterior sheet using a gear stretching device may be referred to as “gear stretching”, “gear stretching”, or the like.

  FIG. 13 is a schematic diagram for explaining a gear stretching device for forming a gear stretching region. The gear stretcher 21 shown in FIG. 13 has a pair of gear rolls 22 and 22 '. A plurality of teeth 24 and 24 'are arranged on the outer peripheral surfaces 23 and 23' of the gear rolls 22 and 22 ', respectively. In the gear stretcher 21 shown in FIG. 13, the rotation axes of the gear rolls 22 and 22 'are each perpendicular to the exterior sheet transport direction MD. Further, the plurality of teeth 24 and 24 ′ are disposed on the outer peripheral surfaces 23 and 23 ′ in parallel with the rotation axis.

  In the gear stretcher 21 shown in FIG. 13, when the outer sheet 25 to be gear-stretched is passed through the roll gap between the pair of gear rolls 22 and 22 ′ and the gear rolls 22 and 22 ′ pass, the gear rolls 22 and 22 mesh with each other. The exterior sheet 25 to be gear-stretched is stretched by the principle of three-point bending by using the plurality of teeth 24 and 24 'to form the exterior sheet 26 having a gear stretch region. The exterior sheet 26 having a gear stretch region alternately has a high stretch region and a low stretch region parallel to the orthogonal direction CD, which is a direction perpendicular to the transport direction, in the transport direction MD (not shown).

In the exterior sheet 25 to be gear-stretched, the material is fixed in the region in contact with the tips of the plurality of teeth 24 and 24 ′, so that it is not stretched too much or substantially and a low-stretch region is formed (not shown). ) On the other hand, in the exterior sheet 25 to be gear-stretched, a region not in contact with the tip portions of the plurality of teeth 24 and 24 ′, that is, a region between the tip portion of the teeth 24 and the tip portion of the teeth 24 ′ is greatly stretched. And a highly stretched region is formed (not shown).
As a result, in the gear stretching apparatus as shown in FIG. 13, a gear stretching region mainly stretched in the transport direction MD is formed.

The gear stretching can also be performed using a gear stretching apparatus as shown in FIG.
FIG. 14 is a schematic diagram for explaining gear stretching. The gear stretcher 21 shown in FIG. 14 has a pair of gear rolls 22 and 22 ′. A plurality of teeth 24 and 24 'are arranged on the outer peripheral surfaces 23 and 23' of the gear rolls 22 and 22 ', respectively. Moreover, in the gear extending | stretching apparatus 21 shown by FIG. 14, several teeth 24 and 24 'are each arrange | positioned at the outer peripheral surfaces 23 and 23' perpendicularly to the rotating shaft line of the gear rolls 22 and 22 ', respectively. By arranging the plurality of teeth 24 and 24 ′ perpendicularly to the rotation axis in this way, the outer sheet 26 having the gear stretch region has a high stretch region and a low stretch region parallel to the transport direction MD, respectively, in the orthogonal direction. Alternately on CD (not shown).
As a result, in the gear stretcher as shown in FIG. 14, a gear stretch region that is mainly stretched in the orthogonal direction CD is formed.

  Further, the gear stretching can be performed using a gear stretching device in which a plurality of teeth are arranged on the outer peripheral surface of the gear roll so as to be inclined with respect to the rotation axis of the gear roll as shown in FIG. . FIG. 15 is a schematic diagram for explaining gear stretching. The gear stretching device 21 shown in FIG. 15 has a pair of gear rolls 22 and 22 ′, and a plurality of teeth 24 and 24 ′ are arranged on the outer peripheral surfaces 23 and 23 ′ of the gear rolls 22 and 22 ′, respectively. Yes. Further, in the gear stretcher 21 shown in FIG. 15, the rotation axes of the gear rolls 22 and 22 ′ are each perpendicular to the transport direction MD. Further, the plurality of teeth 24 and 24 ′ are arranged on the outer peripheral surfaces 23 and 23 ′ so as to have a constant angle θ with respect to the rotation axis.

In the gear stretching apparatus as shown in FIG. 15, depending on the angle θ and the gear pitch, one tooth 24 and one tooth 24 ′ are formed on the outer peripheral surfaces 23 and 23 ′ of the gear rolls 22 and 22 ′, respectively. May be arranged.
As a result of using the gear stretching apparatus as shown in FIG. 15, a gear stretched region that is mainly stretched in the direction having a certain angle from the transport direction MD is formed.

In the gear stretching apparatus, the gear pitch is preferably about 1 to about 10 mm, and more preferably about 2 to about 6 mm. If the gear pitch is less than about 1 mm, it is necessary to make the gear blade thin, the exterior sheet may be partially cut, and if the gear pitch exceeds about 10 mm, stretching tends to be insufficient.
The gear pitch means a distance between one tooth and the next tooth represented by reference numeral 27 in FIG.

In the gear stretching apparatus, the gear biting depth is preferably about 0.5 mm or more. If the gear biting depth is less than about 0.5 mm, stretching may be insufficient.
The gear biting depth means a depth of a portion represented by a reference numeral 28 in FIG. 14 where the teeth of the upper gear roll and the teeth of the lower gear roll overlap.

  In the gear stretching region of the exterior sheet, the stretch ratio per gear stretching is preferably about 30 to about 400%, more preferably about 50 to about 300%, and about 100 to 200%. More preferably it is. If the draw ratio is less than about 30%, the exterior sheet may not be sufficiently stretched, and if the stretch ratio exceeds about 400%, the exterior sheet may break.

により算出される値を意味する。 In the present specification, the “stretch ratio” is expressed by the following formula when the gear pitch is P and the gear biting depth is D:

Means the value calculated by.

The gear extension region in which the exterior sheet is mainly extended in the width direction is passed through a gear extension apparatus as shown in FIG. 13 such that the longitudinal direction of the exterior sheet faces the orthogonal direction CD, or in FIG. It can be formed by passing through a gear stretching apparatus as shown in the drawing so that the longitudinal direction of the exterior sheet faces the conveying direction MD and stretching the gear.
Further, the gear extension region in which the exterior sheet is mainly extended in the longitudinal direction is allowed to pass through a gear stretching apparatus as shown in FIG. 13 such that the longitudinal direction of the exterior sheet faces the conveyance direction MD, or FIG. It can be formed by gear stretching by passing it through a gear stretching apparatus as shown in FIG. 14 such that the longitudinal direction of the exterior sheet faces the orthogonal direction CD.
In addition, the said gear extension can also be performed according to the procedure as described in Unexamined-Japanese-Patent No. 2009-228145.

  FIG. 16 is a development view showing another embodiment of the present invention. FIG. 16 is a development view of the disposable diaper 1 and is a view of the disposable diaper 1 as seen from the skin surface side. The disposable diaper 1 shown in FIG. 16 includes an exterior sheet 2, an absorbent body 3, and a liquid-impervious leak-proof sheet 4, and includes one waistline opening 8 and a pair of leg-hole openings 9. It has a trunk shape.

  In the disposable diaper 1 shown in FIG. 16, the front body F has a front waistline region FW including a plurality of elastic members 6F and a front crotch region FC, and the back body R includes a plurality of elastic members 6R. The rear waistline region RW and the rear crotch region RC are included, and the side edge of the front waistline region FW and the side edge of the rear waistline region RW are joined at the joint portion J, whereby the waistline opening 8 Then, the side edge of the front crotch region FC and the side edge of the rear crotch region RC are joined at the joint J, whereby a pair of leg opening 9 is formed.

  In the disposable diaper 1 shown in FIG. 16, in the rear crotch region RC, the exterior sheet 2 is a pair of gear rolls, and rotates while meshing a plurality of teeth arranged on the outer peripheral surfaces of the gear rolls. It includes a gear extension region 15 formed by passing it through a gap in the object. In the disposable diaper shown in FIG. 16, the range of the absorbent body 3 and the range of the gear extension region 15 partially overlap in the thickness direction.

FIG. 17 is a view showing a YY cross section of the disposable diaper 1 shown in FIG. 16.
In an embodiment in which the range of the absorbent body and the range of the gear extension region overlap in the thickness direction of the disposable diaper as shown in FIG. 17, the absorbent body is liquid-free in the range of overlap with the gear extension region. It is preferable that the sheet is not fixed to two or more non-continuous regions of the exterior sheet both when the permeable leakage preventing sheet is interposed and when the liquid impermeable leakage preventing sheet is not interposed. This is because the depression 16 that can be along the user's buttocks may be blocked.

  As long as the gear extension region is arranged in the rear crotch region, the range of the gear extension region may overlap with the range of the absorber, but the range of the gear extension region overlaps with the range of the absorber. In this case, it is preferable to fix the absorbent body to the exterior sheet after gear-stretching the exterior sheet. Although the manufacturing method of the disposable diaper of this invention is mentioned later, when an exterior sheet | seat is gear-stretched with an absorber, it is because problems, such as an exterior sheet | seat not being gear-stretched and the structure of an absorber being destroyed, will arise.

  Moreover, it is preferable that the said gear extending | stretching area | region does not exist in a rear side waist area. This is because the gear extending region is generally formed after the elastic member is disposed on the exterior sheet, and therefore, when the rear waistline region is gear extended, the elastic member is likely to be broken.

  The gear extension region is preferably disposed at a position spaced at least about 30 mm from the side edge of the exterior sheet. When the side edges of the exterior sheet are gear-extended, a position shift occurs when the side edges of the front body and the back body of the disposable diaper are joined. As a result, the shape of the front body and the shape of the back body This is because there is a case where there is no difference between the two.

  In the disposable diaper having the gear extension region of the present invention, the liquid-impermeable leak-proof sheet is arranged between the absorber and the exterior sheet so as to cover the area where the absorber exists, and the size thereof is large. The thickness is not particularly limited, and the liquid-impermeable leak-proof sheet may be disposed on the entire surface of the exterior sheet.

  Moreover, in the disposable diaper which has the gear extending | stretching area | region of this invention, it is preferable that a liquid-impermeable leak-proof sheet exists in a part of gear extending area | region, Preferably all the gear extending | stretching areas. That is, the gear extension region is a pair of gear rolls that rotate while meshing a plurality of teeth arranged on the outer peripheral surfaces of the gear rolls. It is preferable to form by passing. As described above, the gear stretching is a non-uniform stretching that forms a high stretch region and a low stretch region on the sheet. In the high stretch region of the exterior sheet, the thickness is thin and excrement leaks. This is because the leakage of excrement can be prevented by the presence of a liquid-impermeable leak-proof sheet in the highly stretched region.

  In the disposable diaper having the gear extension region of the present invention, the embodiment has been described in which the exterior sheet is formed from a single material, but the exterior sheet may be formed from a single material, Or you may form from the several raw material. Examples in which the exterior sheet is formed of a plurality of materials include those shown in FIGS. 8 and 9.

  As described above, the disposable diaper of the present invention has been described with respect to the embodiment having pleats and the embodiment having a gear extension region. In both embodiments, the area of the back body of the exterior sheet is that of the exterior sheet. It is preferably about 10 to about 30% larger and more preferably about 15 to about 25% larger than the area of the front body. A disposable diaper that can fit both the genital side and the buttocks side of the user is formed by making the area of the back body of the exterior sheet about 10% to about 30% larger than the area of the front body of the exterior sheet. be able to.

The exterior sheet used in the present invention is not particularly limited, and those used as an exterior sheet in this technical field can be employed without particular limitation. For example, a spunbond nonwoven fabric, a point bond nonwoven fabric, Examples thereof include SMS (spunbond / meltblown / spunband) nonwoven fabric, liquid-impervious plastic film, and a sheet laminated with each other. The basis weight of the outer sheet is usually in the range of about 10 to 40 g / m ^2.

  8 and 9, as the reference numeral 2 b, examples of the leg periphery sheet disposed around the leg opening include an extensible sheet, an elastic sheet, and the like. Examples of the extensible sheet include a composite sheet in which a non-extensible nonwoven fabric partially cut or weakened is bonded to a thermoplastic resin film such as a thermoplastic resin film such as polyethylene or polypropylene. . On the other hand, as the stretchable sheet, for example, a nonwoven fabric composed of stretchable fibers formed from a thermoplastic elastomer resin such as urethane or styrene, a non-stretchable nonwoven fabric partially cut or weakened into a nonwoven fabric composed of stretchable fibers A composite sheet or the like bonded together.

As an absorber used for this invention, what consists of an absorption core and a core wrap is mentioned. The absorbent core is not particularly limited, and those used as an absorbent core in the art can be employed without particular limitation. For example, a superabsorbent polymer, pulverized pulp, thermoplastic synthesis Examples thereof include a mixture with fibers (staple fibers). The core wrap is not particularly limited, and any core wrap used in the art can be used without particular limitation. For example, an air-through fiber having a basis weight of about 10 to about 30 g / m ² . Nonwoven fabric, spunbonded nonwoven fabric, SMS nonwoven fabric, tissue and the like can be mentioned. The core wrap may also serve as a surface sheet described later.

The liquid-impervious leak-proof sheet used in the present invention is not particularly limited, and any liquid-impervious leak-proof sheet used in the technical field can be adopted without particular limitation. For example, a plastic film having liquid impermeability, for example, a polyethylene film having a basis weight of about 15 to 25 g / m ² , a liquid-impervious nonwoven fabric, for example, an SMS nonwoven fabric having a basis weight of about 10 to 30 g / m ² And laminates thereof.

The disposable diaper of this invention can further have a surface sheet and a three-dimensional gather. The surface sheet is not particularly limited, and those used as surface sheets in this technical field can be employed without particular limitation. For example, a nonwoven fabric having liquid permeability, such as a basis weight, can be used. Examples include about 15 to about 45 g / m ² of air-through nonwoven fabric, spunbond nonwoven fabric, and SMS nonwoven fabric.
The three-dimensional gathers are not particularly limited, and those used as three-dimensional gathers in this technical field can be employed without any particular restrictions. For example, a known nonwoven fabric having hydrophobicity or liquid impermeability For example, a spunbond nonwoven fabric, a point bond nonwoven fabric, an SMS nonwoven fabric, a liquid impervious plastic film having a basis weight of about 10 to about 40 g / m ² , a laminate thereof, and the like.

The disposable diaper of this invention can be manufactured without a restriction | limiting in particular, combining the method well-known in this technical field, and the above-mentioned description, For example, it can manufacture as follows.
First, a plurality of elastic members are fixed to both sides of the continuous exterior sheet unwound from the roll in the transport direction using an adhesive or the like in parallel with the transport direction. When the disposable diaper of the present invention has a gear stretch region, the above-described gear stretch is performed in a region corresponding to the rear crotch region to form a gear stretch region. Next, the liquid-impermeable leak-proof sheet and the absorbent body are fixed to a predetermined position of the continuous exterior sheet using an adhesive or the like. In addition, when the range of the gear extension region and the range of the absorber do not overlap in the thickness direction, the order of the gear extension, the liquid-impermeable leak-proof sheet and the absorber is attached Can be replaced.

  Next, a hole for a leg opening is formed in a continuous exterior sheet, and when the disposable diaper of the present invention has pleats, a protrusion is provided on the exterior sheet, and the protrusion is provided as necessary. A pleat is formed by fixing to the exterior sheet using an adhesive or the like. Then, the exterior sheet is folded so that both ends in the orthogonal direction of the continuous exterior sheet coincide with each other, and the folded exterior sheet is fixed at a certain interval, for example, compressed, and the exterior sheet is fixed to the fixed part. The disposable diaper of the present invention can be manufactured by separating with.

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2,2a Exterior sheet 2b Leg circumference sheet 3 Absorber 4 Liquid impervious leakproof sheet 5 Protruding part 5 'Protruding part tip 5' Protruding part second tip 6F, 6R Elastic member 7 pleats 8 waistline opening 9 leg opening 10 skin side 11 clothing side 12, 12 ', 12''adhesive part 13 excrement receiving part 14 pressing part 15 gear extension region 16 depression 21 gear extension device 22, 22' Gear roll 23, 23 'Outer peripheral surface 24, 24' Multiple teeth 25 Outer sheet to be gear extended 26 Outer sheet having gear extension region 27 Gear pitch 28 Gear biting depth A Longitudinal direction B Width direction J Joint F Front body FW Front waistline FC Front inseam area R Rear body RW Rear waistline RC Rear inseam area RD Lower area RU Upper area MD Transport direction CD Orthogonal direction

Claims (12)

A trunks-shaped disposable diaper comprising an exterior sheet, an absorbent body, and a liquid-impervious leak-proof sheet between the exterior sheet and the absorbent body, and comprising one waistline opening and a pair of leg-hole openings Because
The front body of the disposable diaper has a front waistline region including an elastic member and a front crotch region, and the back body of the disposable diaper has a rear waistline region including a resilient member and a back crotch region. The side waist of the front waistline and the side edge of the back waistline are joined to form the waistline opening, and the side edge of the front waistline and the side edge of the back waistline The pair of leg openings are formed by being joined,
The rear crotch region forms a protruding portion that protrudes toward the clothing side by folding a part of the exterior sheet so that the skin side faces each other, and the side edge of the protruding portion is Fixing to the exterior sheet or folding a part of the exterior sheet so that the clothing side faces each other to form a projecting portion projecting to the skin surface side, and the side edge of the projecting portion Formed by fixing to the exterior sheet, having pleats,
The disposable diaper characterized by the above-mentioned.   The protruding portion that protrudes toward the clothing side is fixed to the exterior sheet such that the tip thereof faces the leg opening portion side, or the protruding portion that protrudes toward the skin surface side The disposable diaper of Claim 1 currently fixed to the said exterior sheet so that it may face the waistline opening part side.   The side edge of the said protruding part is being fixed to the junction part formed by joining the side edge of the said front crotch area, and the side edge of a rear crotch area of the said exterior sheet. Or the disposable diaper of 2.   The absorbent body is in contact with the pleat and a lower region located below the pleat when worn, with the liquid-impermeable leak-proof sheet interposed therebetween, among the exterior sheets of the back body. However, in the outer sheet of the back body, the absorber is located above the pleats when worn, with the liquid-impermeable leak-proof sheet interposed therebetween or liquid-impermeable. The disposable diaper as described in any one of Claims 1-3 which is not contacting without pinching | interposing a leak-proof sheet | seat between them.   In the outer sheet of the back body, the absorbent body includes the pleats, a lower region located below the pleats when worn, and an upper region located above the pleats when worn. The absorbent body is in contact with the liquid-impervious sheet, or the liquid-impermeable sheet, or the liquid-impermeable sheet. The disposable diaper as described in any one of Claims 1-3 which is not being fixed to the area | region.   The disposable diaper as described in any one of Claims 1-5 whose longitudinal length of the said disposable diaper of the said pleat is 5-40 mm. A trunks-shaped disposable diaper comprising an exterior sheet, an absorbent body, and a liquid-impervious leak-proof sheet between the exterior sheet and the absorbent body, and comprising one waistline opening and a pair of leg-hole openings Because
The front body of the disposable diaper has a front waistline region including an elastic member and a front crotch region, and the back body of the disposable diaper has a rear waistline region including a resilient member and a back crotch region. The side waist of the front waistline and the side edge of the back waistline are joined to form the waistline opening, and the side edge of the front waistline and the side edge of the back waistline The pair of leg openings are formed by being joined,
In the rear crotch region, a pair of gear rolls are formed by passing at least the outer sheet through a gap between a plurality of gear rolls that rotate while meshing with each other. A gear extension region is formed,
The disposable diaper characterized by the above-mentioned.   The outer stretch sheet and the liquid-impervious leak-proof sheet are provided in a gap between the gear extension region, which is a pair of gear rolls and rotates while meshing a plurality of teeth arranged on the outer peripheral surfaces of the gear rolls. The disposable diaper of Claim 7 formed by letting pass.   The disposable diaper according to claim 7 or 8, wherein the gear extension region is formed by extending the exterior sheet in at least a width direction of the disposable diaper.   The disposable diaper according to any one of claims 7 to 9, wherein the gear extension region is formed by extending the exterior sheet at least in a longitudinal direction when the disposable diaper is deployed.   The disposable diaper according to any one of claims 7 to 10, wherein the absorber is not fixed to the exterior sheet in the gear extension region.   The disposable diaper according to any one of claims 1 to 11, wherein an area of a rear body of the exterior sheet is 10 to 30% larger than an area of a front body of the exterior sheet.

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