WO2009090818A1

WO2009090818A1 - Pants type disposable diaper and method of manufacturing the same

Info

Publication number: WO2009090818A1
Application number: PCT/JP2008/072818
Authority: WO
Inventors: Toshifumi Otsubo
Original assignee: Uni-Charm Corporation
Priority date: 2008-01-16
Filing date: 2008-12-16
Publication date: 2009-07-23
Also published as: EA201070847A1; ZA201005815B; BRPI0819968A2; JP5405810B2; MA32085B1; EA018662B1; JP2009201979A; MX2010007819A; CO6290618A2

Abstract

A pants type disposable diaper having less gathers on the innermost side of a crotch region. In the crotch region (6) of the pants type disposable diaper (1), there is provided a bodily-fluid absorptive core material (26) located between a liquid-permeable inner surface-side sheet (23) and a liquid-impermeable outer surface-side sheet (24). On the inner side of the inner surface-side sheet (23) is provided an innermost sheet (21) which prevents contact between the inner surface-side sheet (23) and a wearer's skin. The innermost sheet (21) has opposite ends in the front-rear direction (A), and portions near the opposite ends are joined to at least either the inner surface-side sheet (23) or the outer surface-side sheet (24). Further, the innermost sheet (21) has a tuck (36) located at a portion on the lateral centerline (P) of the diaper (1) and hanging toward the inner surface-side sheet (23).

Description

Pants-type disposable diaper and method for manufacturing the same

The present invention relates to a pant-type disposable diaper and a method for manufacturing the same, and more particularly to the diaper suitable for preventing contact between the inner surface side sheet covering the liquid-absorbent core and the skin and the method for manufacturing the diaper.

Conventionally, the disposable diaper which provided the sheet piece which can be separated from the inner surface side sheet in the thickness direction of the bodily fluid absorption part inside the liquid permeable inner surface side sheet which forms the body fluid absorption part of the disposable diaper is publicly known. . The sheet piece may be formed with an opening through which feces and urine can pass toward the body fluid absorbing portion, and the space between the inner surface side sheet and the sheet piece is used as a pocket for storing stool or the like. Sometimes. The sheet piece acts to prevent the inner surface side sheet soiled with feces or the like from touching the diaper wearer's skin.

For example, an open-type disposable diaper disclosed in Japanese Patent Laid-Open No. 5-305109 (Patent Document 1) is a liquid-resistant second upper surface located on the upper surface of a liquid-permeable first upper surface sheet covering a liquid-absorbent core. A long opening in the front-rear direction of the diaper is formed in the sheet. Elastic members are attached to both side edges of the opening in an extended state. When the elastic member contracts, the second upper surface sheet is separated from the first upper surface sheet, and the excrement of the diaper wearer enters between the two sheets through the opening.

The open type diaper disclosed in Japanese Patent Publication No. 9-510385 (Patent Document 2) is a liquid-permeable material in which flaps attached to the inner surfaces of both sides are joined at the crotch portion to cover the absorbent body. A space capable of accommodating feces is formed between the seat and these flaps. The stool that passes between the flaps on both sides becomes difficult to come into contact with the skin of the diaper wearer by entering the space. An elastic member is attached to the edge of the flap in an extended state.

The pants-type diaper disclosed in Japanese Patent Laid-Open No. 2002-11044 (Patent Document 3) has a skin contact sheet on a liquid-permeable top sheet covering the absorber. The skin contact sheet has an opening at a portion formed to be separable from the top sheet, and an elastic member is attached to the skin contact sheet in an elongated state so as to surround the opening. Since the diaper wearer's stool enters between the skin contact sheet and the top sheet through the opening, it does not come into contact with the diaper wearer's skin. Further, due to the presence of the skin contact sheet, the wet top sheet does not come into contact with the skin.
JP-A-5-305109 Japanese National Patent Publication No. 9-510385 JP 2002-11044 A

In any of the conventional diapers, the sheet piece such as the second upper surface sheet provided further inside the liquid-permeable inner surface side sheet covering the body fluid-absorbing core material is an elastic member when the diaper is worn. Shrinks and the dimension in the front-rear direction is apparently reduced. As a result, the sheet piece is separated from the inner surface side sheet, and a space capable of receiving feces is formed between the sheet piece and the inner surface side sheet. However, in the sheet piece, a large number of deep gathers may be generated due to the contraction of the elastic member, and the inside of such a gathered diaper is complicated and may take time when trying to pass a leg through the diaper. . Moreover, when such gathers occur in a narrow crotch region and the crotch region is bulky, it may be difficult to obtain a good fit when wearing a diaper.

Therefore, an object of the present invention is to provide an improved pants-type disposable diaper that can solve such problems in the prior art and a method for manufacturing the same.

This invention for solving the above-mentioned problems is composed of a first invention related to a pants-type disposable diaper and a second invention related to a manufacturing method thereof.
The first invention is directed to a crotch region, a front waist region located in front of the crotch region, and a rear portion of the crotch region, having a front-rear direction, a lateral direction, and a vertical direction orthogonal to each other. A pant shape having a waist opening and a pair of leg openings is formed by a rear waist area, and the crotch area is formed between a liquid-permeable inner side sheet and a liquid-impervious outer side sheet. A body fluid absorbing portion having a body fluid absorbing core material interposed between the inner surface side sheet and a skin portion located further inside than the inner surface side sheet and spaced apart from the inner surface side sheet in the thickness direction of the core material. A pants-type disposable diaper having an innermost sheet that acts as a separator that prevents direct contact with the diaper.

In such a diaper, the features of the first invention are as follows. In the innermost sheet, the portions near the both ends in the front-rear direction of the part on the front-rear direction center line extending in the front-rear direction by dividing the lateral dimension of the diaper into two equal parts are the inner surface side sheet and the outer surface side sheet. It is joined to at least one of them. The innermost sheet is also formed such that a portion between the portions in the vicinity of the both ends is separable from the inner surface side sheet in the thickness direction of the core member and acts as the separator. Further, the innermost sheet is further divided into the front and rear direction dimensions of the diaper and is formed so as to be separated from the inner surface side sheet on the lateral center line extending in the lateral direction from the inner surface side to the inner surface side. A tack that hangs down toward the sheet is formed.

In one preferred embodiment of the first invention, the innermost sheet is capable of directing urine excreted by a wearer of the diaper directly to the body fluid absorbing portion without going through the innermost sheet. It is possible to direct the front opening formed forward of the lateral center line and the feces excreted by the wearer directly to the body fluid absorbing portion without going through the innermost sheet, It has at least one of the rear openings formed behind the horizontal center line.

In another one of the preferred embodiments of the first invention, the tack is formed by joining the portions where the innermost sheets overlap each other when the diaper is folded along the lateral center line. Is formed.

In another preferred embodiment of the first invention, the innermost sheet is a state in which the hourglass-shaped sheet piece is folded on the lateral center line, and the sheet piece is the front and rear. In the part located in the waist area, it is formed to be elastically stretchable / shrinkable in the lateral direction, and in the part located in the crotch area, at least a portion along the lateral center line is elastically inelastic in the lateral direction. Therefore, it is formed so as not to expand or contract.

In still another one of the preferred embodiments of the first invention, the body fluid absorbing portion is in a panel shape, and any one of the inner surface side sheet and the outer surface side sheet extending from a peripheral portion of the core member. Are joined to the outer surface of the innermost sheet.

Of the present invention, the second invention is directed to a method for manufacturing a diaper according to the first invention having at least a rear opening of the front opening and the rear opening in the first invention. is there.

This second invention is characterized in that the manufacturing method of the diaper includes the following steps.
(1) A step of continuously supplying a sheet continuous body having a predetermined width for obtaining the innermost sheet in the machine direction;
(2) The rear openings are arranged at regular intervals in the machine direction at positions spaced apart in the cross direction from a center line that bisects the width located in the cross direction perpendicular to the machine direction of the sheet continuum. The step of forming sequentially,
(3) The body fluid absorbing portion is joined to one surface of both surfaces of the sheet continuum in such a manner that the core material covers the rear opening and extends in the intersecting direction across the center line. Process,
(4) Any one of the surface opposite to the one surface of the sheet continuum, the portion between the center line and the rear opening, and the portion that is symmetrical with respect to the center line. Applying a hot melt adhesive;
(5) Sequentially extending the sheet continuum along the portions that are joined to the sheet continuum and extend in the intersecting direction between the adjacent body fluid absorbing portions and are arranged at regular intervals in the machine direction A step of cutting, and (6) a step of joining the sheet continuums folded in half along the portion before the step of cutting the sheet continuums.

In one preferred embodiment of the second invention, the front openings are sequentially formed at the predetermined intervals in the machine direction with respect to the center of the sheet continuum at positions opposite to the rear openings with respect to the center line. The process of carrying out is included.

In another preferred embodiment of the second invention, the step of applying an adhesive for joining the one surface and the body fluid absorbing portion on the center line of the one surface of the sheet continuum. included.

In the pant-type disposable diaper according to the present invention, the innermost sheet is provided further inside the liquid-permeable inner surface side sheet covering the body fluid-absorbing core material. In the innermost sheet, a portion that extends in the front-rear direction on the center line in the front-rear direction and that can be separated from the inner sheet acts as a separator that prevents contact between the inner sheet and the skin. The part that acts as the separator is formed with a tack that hangs down from the innermost sheet toward the inner sheet, and the dimension in the front-rear direction is shortened by the dimension of the tuck that hangs down, so that gathers and sagging are less likely to occur. .

Other effects obtained by the preferred embodiment of the present invention will be described in detail below.

The partial fracture perspective view of a pants-type disposable diaper. II-II sectional view taken on the line of FIG. The partially broken top view of the disassembled diaper. The figure similar to FIG. 3 which shows an example of embodiment. The disassembled perspective view of the underpants type disposable diaper which shows an example of embodiment. FIG. 6 is a cross-sectional view taken along the line VI-VI of the diaper of FIG. The top view of the diaper of FIG. 5 which decomposed | disassembled. FIG. 6 is a view taken along line VIII-VIII in FIG. 5. The partial view of the diaper manufacturing process which is an example of embodiment. The figure similar to FIG. 9 which is another example of embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pants-type disposable diaper 6 Inseam area 7 Front waist area 8 Rear waist area 11 waist opening 12 Leg opening 21 Innermost sheet 23 Inner surface side sheet 24 Outer surface side sheet 26 Core material 31 Front opening part 32 Rear opening part 36 Tack A Front-rear direction B Horizontal direction C Vertical direction P Front-rear center line Q Horizontal center line R Vertical center line

Referring to the attached drawings, the details of the pants-type disposable diaper and the manufacturing method thereof according to the present invention will be described as follows.

FIG. 1 is a partially broken perspective view of a pants-type disposable diaper 1 in a worn state, indicated by double-headed arrows A, B, and C in which the front-rear direction, the horizontal direction, and the vertical direction of the diaper 1 are orthogonal to each other. Yes. The diaper 1 has a crotch region 6, a front waistline region 7 located in front of the crotch region 6, and a back waistline region 8 located behind the crotch region 6. The eight

side edge portions

7a and 8a overlap each other in the form of a palm, and are welded to each other at a joint portion 9 formed intermittently in the longitudinal direction C. The diaper 1 also has a waist opening 11 and a pair of leg openings 12, and is attached to an innermost sheet 21 facing the skin of a wearer (not shown) and an outer surface 21b of the innermost sheet 21. And the body fluid absorption part 22. The innermost sheet 21 is formed such that the portions forming the front and

rear waist regions

7 and 8 are elastically stretchable / shrinkable in the lateral direction B, and most of the portions forming the crotch region 6 are formed. It is formed so that it does not stretch in the lateral direction B both elastically and inelastically. The innermost sheet 21 is preferably liquid-impervious as a whole, and more preferably the whole is air-permeable and liquid-impervious, but the portions forming the front and

rear waist areas

7 and 8 are liquid-impervious. It can also be made so that the part which forms the crotch region 6 is liquid-permeable. The body fluid absorbing portion 22 includes a core material composed of a liquid permeable inner surface side sheet 23, a liquid impermeable outer surface side sheet 24, and a body fluid absorbing material between these

sheets

23 and 24 and a tissue paper covering the body fluid absorbing material. 26, the two

sheets

23 and 24 extending from the periphery of the core material 26 are overlapped and joined to each other, and at least one of the both

sheets

23 and 24 is joined to the innermost sheet 21. . At both side edge portions 27 of the crotch region 6, the innermost sheet 21, the inner surface side sheet 23, and the outer surface side sheet 24 are overlapped and joined. Further, a leg elastic member 28 extending between the inner side sheet 23 and the outer sheet 24 at the side edge 27 and extending along the side edge 27 is extended to at least one of the

sheets

23 and 24. It is joined. Between the side edge portions 27, the innermost sheet 21 and the inner surface side sheet 23 are separated in the thickness direction of the core member 26. Further, the innermost sheet 21 is formed with a front opening 31 in front of a lateral center line Q extending in the lateral direction B by dividing the dimension of the diaper 1 in the front-rear direction A, and the lateral center line A rear opening 32 is formed behind Q. The front opening 31 is in a position where the external genitalia of the diaper wearer can be looked over, and the rear opening 32 is in a position where the anus of the wearer of the diaper can be looked over there. A person's urine and feces can go directly to the body fluid absorption part 23 without going through the innermost sheet 21. Moreover, the urine that has passed through the front opening 31 and the stool that has passed through the rear opening 32 enter the skin of the diaper wearer by entering between the innermost sheet 21 and the inner surface sheet 23 that are separated from each other. There is no contact.

FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, and this line II-II coincides with the front-rear direction center line P extending in the front-rear direction A by dividing the dimension of the diaper 1 in the lateral direction B ing. The innermost sheets 21 in the front and

rear waist regions

7 and 8 are joined to each other in parallel with a longitudinal center line R extending in the longitudinal direction C by equally dividing the dimension of the diaper 1 in the longitudinal direction A. An upper edge portion 34 of the opening 12 is formed. In the crotch region 6, a tack 36 is formed on the innermost sheet 21. The tack 36 is formed by adhering or welding the innermost sheets 21 to each other in a joining region 37 located on the longitudinal center line R. The innermost sheet 21 has a front opening 31 and a rear opening. 32, the innermost sheet 21 is folded so as to be along the longitudinal center line R. In other words, the tack 36 hangs down from the innermost sheet 21 in a state of being separated from the inner surface side sheet 23 toward the inner surface side sheet 23 and is on the lateral center line Q (see FIG. 1). . The joint region 37 of the tack 36 is formed at least at the top 38 of the tack 36 in the longitudinal direction C, but can be expanded by an appropriate dimension toward the bottom 39 of the tack 36. Although the dimension of the joining area | region 37 in the horizontal direction B is smaller than the dimension of the width | variety of the crotch area 6, it can enlarge so that the joining area | region 37 does not prevent easy wearing of the diaper 1. FIG. For example, when the diaper 1 is for infants, the size is preferably 5 to 30 mm. The tack 36 can also join the outer surface of the bottom portion 39 to the inner surface side sheet 23 by a joining means 41 such as an adhesive. The innermost sheet 21 is not limited to the part forming the bottom part 39 of the tack 36, but the whole part located on both sides of the bottom part 39 on the lateral center line Q is joined to the inner surface side sheet 23. (See FIG. 4).

Between the innermost sheet 21 and the inner surface side sheet 23, a front space 42 positioned in front of the lateral direction center line Q and a rear space 43 positioned in the rear direction of the lateral direction center line Q are formed. A tack 36 is formed between the two

spaces

42 and 43. The front opening 31 in the innermost sheet 21 communicates with the inside and outside of the front space 42 and allows urine to enter the front space 42. The rear opening 32 communicates with the rear space 43 and allows the stool to enter the rear space 43.

3, in the diaper 1 of FIGS. 1 and 2, the joints in the parts 9 of the front and

rear waist regions

7 and 8 are removed, and the joints of the innermost sheets 21 in the joint region 37 of the tack 36 are removed. It is a partial fracture top view of decomposition | disassembly diaper 1a obtained by extending the front-back trunk periphery area |

regions

7 and 8 to the front-back direction A and the horizontal direction B. FIG. However, the same referential mark as the diaper 1 is used for the site | part which is common in the site | part of the diaper 1 among the site | parts of the decomposition | disassembly diaper 1a.

The innermost sheet 21 in the disassembled diaper 1 a is formed by a composite sheet including a first sheet 51, a second sheet 52, and a third sheet 53. The first sheet 51 is formed in an almost hourglass shape, has a crotch region 6 and front and

rear waist regions

7, 8, and does not expand or contract elastically or inelastically. It is used so as to face the inner surface side sheet 23. The second sheet 52 elastically expands and contracts in the lateral direction B, and is in an extended state via a hot melt adhesive 56 on the inner surface of the first sheet 51 in a part of the crotch region 6 and the front waistline region 7. It is attached with. The third sheet 53 elastically expands and contracts in the lateral direction B, and extends through the hot melt adhesive 56 on the inner surface of the first sheet 51 in a part of the crotch region 6 and the rear waistline region 8. It is attached in a state. A pair of portions 57 indicated by a plurality of dots on the inner surface of the first sheet 51 is a portion corresponding to the joining region 37 in FIG.

In the body fluid absorbing portion 22, the inner surface side sheet 23 and the outer surface side sheet 24 sandwiching the core material 26 overlap each other at the portion extending from the peripheral edge of the core material 26 and are bonded to each other via the hot melt adhesive 58. . Moreover, in the leg periphery side edge part 27 in the decomposition | disassembly diaper 1a, the leg periphery elastic member 28 exists between the inner surface side sheet | seat 23 and the outer surface side sheet | seat 24, and is extended in the front-back direction A in the expansion | extension state. The inner surface side sheet 23 is bonded to the outer surface of the innermost sheet 21 through a hot melt adhesive 59 at the peripheral edge portion. The preferable outer surface side sheet 24 has the same shape and the same size as the inner surface side sheet 23 or is slightly larger than the inner surface side sheet 23. The outer surface side sheet 24 that is larger than the inner surface side sheet 23 preferably has a portion extending from the inner surface side sheet 23 joined to the outer surface of the innermost sheet 21.

Thus, in the illustrated innermost sheet 21, the portions in the vicinity of both ends on the extension of the crotch region 6 in the front-rear direction A are joined to the body fluid absorbing part 22 via the hot melt adhesive 59, and in the crotch region 6. A part located between these two parts is joined to the body fluid absorbing part 22 via the hot melt adhesive 41.

In order to obtain the diaper 1 from the disassembled diaper 1a, the disassembled diaper 1a is folded along the lateral center line Q so that the innermost sheet 21 is inside, the parts 57 in the first sheet 51 are joined together, The side edge 7a of the waist area 7 and the side edge 8a of the rear waist area 8 are joined at a portion 9 (see FIG. 1).

When the diaper 1 thus formed is in a worn state as shown in FIG. 1, the innermost sheet 21 in the crotch region 6 is separated from the inner surface side sheet 23 of the bodily fluid absorption part 22, thereby urine and feces. It functions as a separator that prevents contact between the dirty inner side sheet 23 and the skin. The innermost sheet 21 also has a portion forming the tack 36 and a portion extending from the tack 36 to both sides in the lateral direction B to form a partition wall for the front space 42 and the rear space 43 between urine and feces. Mixing can be prevented. Therefore, in the diaper 1, the trouble that the stool is mixed with urine to increase the fluidity and the skin is soiled with the stool over a wide area is solved. Further, in the innermost sheet 21, the length in the front-rear direction A extending along the front-rear direction center line P in FIG. 3 is shortened by the dimension forming the tack 36 in the diaper 1 of FIGS. Since the elastic member is not contracted and shortened by using the elastic member as in the prior art, the innermost portion of the diaper 1 when the diaper 1 is worn is in the crotch region 6. There is no occurrence of many wrinkles on the inner sheet 21. When such a diaper 1 is worn, when the inside of the diaper 1 is viewed, the leg opening 12 is not hidden by the innermost sheet 21, and the leg can be easily passed through the leg opening 12. . Moreover, since the diaper 1 after wearing does not say that the crotch region 6 is bulky due to the presence of wrinkles, it fits well to the wearer's body.

In the illustrated diaper 1, the front and

rear waist regions

7 and 8 are formed by attaching the elastic second sheet 52 and the third sheet 53 to the inner surface of the inelastic first sheet 51 in a stretched state. When the

third sheets

52 and 53 contract, a large amount of gathering occurs in the first sheet 51 outside the front and

rear waist areas

7 and 8 of the diaper 1 of FIGS. The second and

third sheets

52 and 53 forming the are in a smooth state. Therefore, in this diaper 1, skin is not stimulated by the gathers generated on the inner surface of the front and rear waist area. However, in the diaper 1 that does not require such an effect by the second and

third sheets

52 and 53, the second and

third sheets

52 and 53 can be attached to the outer surface of the first sheet 51 in an extended state. .

In the diaper 1, the innermost sheet 21 is preferably liquid-impermeable and more preferably impermeable to aeration liquid. However, by forming a composite sheet combining sheets having different properties, the inseam region 6 Can be made so as to be liquid-permeable and liquid-impermeable in the front and

rear waist regions

7, 8. For example, the first sheet 51 in the innermost sheet 21 can be a non-woven fabric formed of thermoplastic synthetic fibers or a film formed of thermoplastic synthetic resin. Moreover, the sheet | seat which laminated | stacked these nonwoven fabrics, the sheet | seat which laminated | stacked the nonwoven fabric and the film, etc. can be used. The second and

third sheets

52 and 53 are elastically stretchable / shrinkable nonwoven fabrics including elastic yarns such as urethane yarns, and elastically stretchable / shrinkable films formed of natural rubber or synthetic rubber. Can be used. A liquid-permeable nonwoven fabric, a thermoplastic synthetic resin film, a composite sheet obtained by laminating a nonwoven fabric and a film, or the like can be used for the inner surface side sheet 23. As the outer sheet 24, a liquid-impervious nonwoven fabric, a thermoplastic synthetic resin film, a composite sheet obtained by laminating a nonwoven fabric and a film, or the like can be used.

FIG. 4 is a view similar to FIG. 3 showing an example of the embodiment of the present invention. In the disassembled diaper 1a of FIG. 4, the innermost sheet 21 is formed substantially on the hourglass side and does not extend elastically or inelastically, and the crotch region 6 of the first sheet 51 A second sheet 52 attached to an inner surface or an outer surface of a part and the front waistline region 7 via a hot melt adhesive 56 and not elastically or inelastically extending; The third sheet 53 is attached to the inner or outer surface of a part of the crotch region 6 and the rear waistline region 8 via a hot melt adhesive 56. For either the first sheet 51 or the second sheet 52, a plurality of first elastic members 61 extending in the lateral direction B in the vicinity of the waist opening 11 and in the lateral direction B in the vicinity of the crotch region 6. Each of the extending second elastic members 62 is attached in an extended state. For either the first sheet 51 or the third sheet 53, a plurality of third elastic members 63 extending in the lateral direction B in the vicinity of the waist opening 11, and in the lateral direction B in the vicinity of the crotch region 6. Each of the plurality of extending fourth elastic members 64 is attached in an extended state. On the outer surface of the first sheet 51 in the crotch region 6, crotch region

elastic members

66 and 67 extending in the lateral direction B between the part 57 and the front opening 31 and between the part 57 and the rear opening 32. Is attached in an extended state. The outer surface of the first sheet 51 is joined to the inner surface side sheet 23 via the hot melt adhesive 41 over the entire width of the crotch region 6 at the portion along the lateral center line Q.

In the diaper 1 obtained from the disassembled diaper 1a of FIG. 4, the first to fourth elastic members 61 to 64 can elastically fit the front and

rear waist regions

7, 8 of the diaper 1 around the waist of the diaper wearer. . The crotch region

elastic members

66 and 67 are not indispensable in the diaper 1. However, when the crotch region

elastic members

66 and 67 are present, the innermost sheet 21 in the vicinity of the tack 36 is fitted to the skin of the diaper wearer's leg and other parts. Becomes easier.

The diaper 1 according to the present invention preferably has the front opening 31 and the rear opening 32 formed in the innermost sheet 21, but the present invention is carried out in a state where any opening is not formed. It is also possible.

5, 6, and 7 are views similar to FIGS. 1, 2, and 3 showing an example of the embodiment of the present invention, but in FIG. 5, the innermost sheet 21 and the body fluid absorbing portion 22 in the diaper 1 are vertically arranged. It is shown in a separated state in direction C. The innermost sheet 21 in the diaper 1 is interposed between the front waistline region 7 that contacts the abdomen side of the wearer, the rear waistline region 8 that contacts the back side, and the front and

back waistline regions

7 and 8. And a crotch region 6 that contacts the crotch portion. The body fluid absorbing portion 22 extends from the front waistline region 7 to the back waistline region 8 of the diaper 1 and is joined to the outer surface that is the surface opposite to the surface that contacts the wearer's skin of the innermost sheet 21. The

In the disassembled diaper 1a shown in FIG. 7, the outer peripheral edge portion of the innermost sheet 21 includes a front edge portion 74 and a rear edge portion 75 extending in the lateral direction B, and a pair of side edge portions 76 extending in the vertical direction. ing. Of the side edges 76, the side edges 27 located in the crotch region 6 are curved so as to be convex toward the center line P of the innermost sheet 21. The disassembled diaper 1a becomes a diaper 1 in a pants shape by joining the side edge 7a located in the front waistline region 7 and the side edge 8a located in the back waistline region 8 among the side edges 76, A waist opening 11 and a pair of leg openings 12 are formed. The

edges

74 and 75 of the waist opening 11 and the edge 27 of the leg opening 12 are each attached to the waist elastic member 82 and the leg elastic member 28 under extension, or the innermost sheet 21 is elastic. By having, it exhibits stretchability.

The body fluid absorbing portion 22 is obtained by interposing a core material 26 between the inner surface side sheet 23 and the outer surface side sheet 24. As the core material 26, a known material such as fluff pulp wrapped in tissue paper can be used. The inner surface side sheet 23 and the outer surface side sheet 24 have an area of a size extending in four directions of the core material 26. The core material 26 has an area and shape (for example, a rectangle, a dumbbell shape, etc.) which can cover a wearer's crotch part. A liquid permeable sheet is used for the inner surface side sheet 23 in the body fluid absorbing portion 22, and a liquid impermeable sheet is used for the outer surface side sheet 24.
In FIG. 7, the body fluid absorbing portion 22 is smaller in the vertical and lateral dimensions than the innermost sheet 21. In the diaper 1 having such a body fluid absorbing portion 22, the innermost sheet 21 is the skin contact sheet. Function as.

In the crotch region 6 of the innermost sheet 21, a stool is provided at a position spaced from the lateral center line Q that bisects the front-rear direction A dimension of the disassembled diaper 1a in FIG. A rear opening 32 is formed for passage therethrough. Further, a front opening 31 for allowing urine to pass therethrough is formed at a position away from the lateral center line Q toward the front waistline region 7. However, the present invention can be implemented without providing the front opening 31.

When the body fluid absorbing portion 22 is joined to the outer surface of the innermost sheet 21, the body fluid absorbing portion 22 is disposed so that the core member 26 covers the front opening 31 and the rear opening 32 of the innermost sheet 21. Further, the peripheral edge portion 86 in the body fluid absorbing portion 22 is joined to the innermost sheet 21 by a known joining means such as a hot melt adhesive 59 or heat fusion. Even when the front opening 31 is not provided in the innermost sheet 21, the core member 26 extends from the rear opening 32 across the lateral center line Q of the innermost sheet 21 to the urethral opening of the wearer. The body fluid absorbing portion 22 is attached to the innermost sheet 21 so as to face each other.

In the diaper 1, as shown in the sectional view of FIG. 6, a front space 42 and a rear space 43 are formed in the crotch region 6 of the diaper 1 between the body fluid absorbing portion 22 and the innermost sheet 21. When the diaper 1 is worn, excrement that has passed through the front opening 31 and the rear opening 32 enters these

spaces

42 and 43 and is isolated from the wearer's skin.

Further, the innermost sheet 21 is bent along the lateral center line Q in FIG. 7, the innermost sheets 21 are faced to each other, and the

portions

57 and 57 are bonded to each other with the hot melt adhesive HM. It is formed. The tack 36 is located between the front space 42 and the rear space 43 and extends in the lateral direction B of the diaper 1 (see FIG. 5) and hangs down toward the body fluid absorption part 22. By this tack 36, mixing of stool and urine can be prevented. That is, the innermost sheet 21, which is a sheet that prevents the wearer's skin from being soiled with excrement, also has a function of preventing mixing of urine and feces.

FIG. 8 is a view taken along line VIII-VIII in FIG. When the inside of the diaper 1 is viewed from above the waist opening 11, the body fluid absorption part 22 can be seen below the front opening 31 and the rear opening 32 of the innermost sheet 21 with the front space 42 and the rear space 43 therebetween. . When the diaper 1 is worn, the innermost sheet 21 widely contacts the wearer's skin and prevents the skin from being contaminated with excrement.

Next, an example of the manufacturing process of the diaper 1 illustrated in FIGS. 5 to 8 will be described with reference to FIG. In FIG. 9, a continuous body 121 of sheets having a predetermined width W for obtaining the innermost sheet 21 is continuously supplied in the machine direction indicated by the arrow MD. Both

edges

174 and 175 of the continuum 121 are parallel to the machine direction MD and become the front edge 74 and the rear edge 75 in FIG. A virtual center line M that bisects the width W of the continuum 121 in the cross direction CD orthogonal to the machine direction MD coincides with the lateral center line Q of the diaper 1. Further, the crotch region 6 of the diaper 1 is formed along the virtual center line M, and the front and

rear waist regions

7 and 8 are respectively formed on both sides of the cross direction CD so as to sandwich the crotch region 6.

In FIG. 9, the continuous body 121 is formed with through-holes 112, which are openings 12 around the legs of the diaper 1, at regular intervals in the machine direction MD. Also, a plurality of waistline elastic members 182 are joined under extension along both

edge portions

174 and 175 of the continuous body 121. In addition, the fixed space | interval here means the dimension same as a cutting | disconnection space | interval when cut | disconnecting the continuous body 121 and making it the innermost sheet | seat 21 of the separate diaper 1, and the dimension of the trunk periphery opening 11 of the diaper 1 In other words, it is determined in consideration of the waist size of the diaper 1.

First, the continuum 121 has a front opening 31 through which urine passes and a rear opening 32 through which stool passes at a position spaced apart from the virtual center line M in the cross direction CD, and a center interval D in the machine direction MD. The continuum 121 is sequentially formed in a constant manner. The front opening 31 and the rear opening 32 are formed in a substantially symmetrical shape with respect to a virtual perpendicular F perpendicular to the virtual center line M. Each of the front opening 31 and the rear opening 32 is not particularly limited in shape as long as it can pass urine and feces, but for example, the front opening 31 and the rear opening 32. Can be circular or elliptical and can be formed symmetrically with respect to the virtual center line M. In this way, if the rear opening 32 and the front opening 31 are formed symmetrically with respect to the virtual center line M, the tension applied to the running continuum 121 is substantially the same on both sides of the virtual center line M in the cross direction CD. It is preferable because the shape of the continuous body 121 is stable. However, in the process of FIG. 9, it is also possible to use a continuous body 121 without the front opening 31.

The body fluid absorbing part 22 manufactured in a flow different from the flow of the continuous body 121 is joined to the continuous body 121 so that the center distance D in the machine direction MD is constant. As the body fluid absorbing portion 22, the one illustrated in FIG. 5 is used by extending in the machine direction MD and the cross direction CD. Leg elastic members 28 are joined to both side edges 27 of the body fluid absorbing portion 22 under extension. The bodily fluid absorption part 22 is disposed between two adjacent through holes 112.

When joining the body fluid absorbing part 22 to the continuum 121, the core member 26 is arranged so as to straddle the virtual center line M of the continuum 121 and to be symmetrical with respect to the virtual perpendicular V so as to cover the front opening 31 and the rear opening 32. It joins in the peripheral part 86 of the bodily fluid absorption part 22. FIG. A hot melt adhesive 59 is applied to the peripheral edge 86 in advance. In addition to the peripheral edge portion 86, the body fluid absorbing portion 22 is allowed to join a part of the region where the core material 26 exists to the continuous body 121.
When joining the peripheral edge 86 to the continuous body 121, it is preferable to join the entire surface of the peripheral edge 86 to the continuous body 121.

Next, the hot melt adhesive HM is formed so as to be substantially symmetrical with respect to the virtual perpendicular V between the virtual center line M and the rear opening 32 on the surface opposite to the surface where the body fluid absorbing portion 22 is joined to the continuum 121. Apply.

Further, it is preferable that the hot melt adhesive HM is applied in a range that does not reach the

edges

31 a and 32 a of the front opening 31 and the rear opening 32. When the hot melt adhesive HM is applied in this manner, it is possible to avoid the portion of the continuum 121 that is relatively hardened by the hot melt adhesive HM from stimulating the skin of the wearer.

The application range of the hot melt adhesive HM in the continuum 121 when the front opening 31 is not provided is such that the distance from the virtual center line M is the minimum between the edge 32a of the rear opening 32 and the virtual center line M. A range smaller than the distance is preferable. The hot melt adhesive HM may be applied between the virtual center line M and the edge 32a of the rear opening 32, or may be applied to the opposite side of the rear opening 32 with respect to the virtual center line M. Good.

Next, the continuous body 121 is folded in two along the virtual center line M with the surface of the continuous body 121 coated with the hot melt adhesive HM inside, and the continuous bodies 121 are bonded to each other. As a result, the tack 36 shown in FIG. 6 is formed by the portion where the hot melt adhesive HM is applied. The application pattern of the hot-melt adhesive HM is a dot-like or spiral-like pattern used in the manufacture of ordinary diapers, and has a solid-coated surface so that the rigidity of the tack 36 is higher than the rigidity of other parts of the continuum 121. You can also

After the step of bonding the continuums 121 with the hot melt adhesive HM, the continuum 121 is in the center of the body fluid absorbing part 22 and the body fluid absorbing part 22 adjacent to each other in the machine direction MD and extends in the cross direction CD. In the machine direction MD, cutting is performed at the scheduled cutting sites F arranged at a constant center interval D. When cutting, the part which should become the side edge 7a of the front waist area 7 of the diaper 1 and the part which should become the side edge 8a of the back waist area 8 are joined in advance, whereby the pants-shaped diaper 1 is Obtainable. The part which should be joined beforehand may overlap with the cutting scheduled part F.

In FIG. 9, the case where the through holes 112 are formed in advance in the continuous body 121 has been described. However, the through holes 112 may be formed in the continuous body 121 after the step of joining the body fluid absorbing portion 22 to the continuous body 121. it can.

FIG. 10 is a view similar to FIG. 9 showing another example of the manufacturing process of the diaper 1. The process of FIG. 10 differs from the process of FIG. 9 in that the hot melt adhesive 41 is placed on the virtual center line M of the surface facing the body fluid absorbing portion 22 in the continuum 121, that is, the surface that is the outer surface of the innermost sheet 21 in the diaper 1. It has been applied. When the body fluid absorbing portion 22 is overlapped and joined to the outer surface of the continuous body 121 in the same manner as in the process of FIG. 9, the continuous body 121 is also joined to the body fluid absorbing portion 22 by the hot melt adhesive 41. In the diaper 1 obtained by such a process as shown in FIG. 10, the bottom 39 (see FIG. 6) of the tack 36 is joined to the inner surface side sheet 23 via the hot melt adhesive 41 so as to have the same mode as FIG. Become.

9 and 10, a liquid-impermeable sheet, more preferably a gas-permeable liquid-impermeable sheet, can be used for the continuum 121, but it is liquid-permeable in the crotch region 6 of the diaper 1. In the front and

rear waist regions

7 and 8, a composite sheet in which sheets having different properties are combined so as to be liquid-impermeable can also be used. Moreover, the nonwoven fabric which has elasticity is used for the site | parts where elasticity is requested | required like the trunk periphery opening 11 and the leg periphery opening 12 of a diaper 1, and the nonwoven fabric which does not show elasticity is used for the other part. In addition, a plurality of sheets having different stretchability can be combined and used as the continuous body 121 and the inner and

outer surface sheets

23 and 24.

Claims

A waistline opening having a front-rear direction, a lateral direction, and a longitudinal direction orthogonal to each other, and a crotch region, a front waistline region located in front of the crotch region, and a rear waistline region located behind the crotch region, A pants shape having a pair of leg openings is formed, and a body fluid-absorbing core material is interposed between the liquid-permeable inner surface side sheet and the liquid-impermeable outer surface side sheet in the crotch region. The body fluid absorbing portion and a portion that is further inside than the inner surface side sheet and is separated from the inner surface side sheet in the thickness direction of the core material acts as a separator that prevents direct contact between the inner surface side sheet and the skin. A pants-type disposable diaper having an innermost sheet to perform,
In the innermost sheet, both end portions in the front-rear direction of a part on the front-rear direction center line extending in the front-rear direction by dividing the lateral dimension of the diaper into two equal parts are the inner surface side sheet and the outer surface side sheet. The innermost sheet is also formed so that a portion between the two end portions can be separated from the inner surface side sheet in the thickness direction of the core member, and acts as the separator. ,
Further, the innermost sheet is further divided into the front and rear direction dimensions of the diaper and is formed so as to be separated from the inner surface side sheet on the lateral center line extending in the lateral direction from the inner surface side to the inner surface side. The said diaper characterized by the tack | tuck drooping toward a sheet | seat being formed.
The innermost sheet is capable of directing urine excreted by the wearer of the diaper directly to the body fluid absorbing portion without going through the innermost sheet, and is formed in front of the lateral center line. The front opening and the stool excreted by the wearer can be directed directly to the body fluid absorption part without going through the innermost sheet, and are formed behind the lateral center line. The diaper according to claim 1, wherein the diaper has at least one of the rear openings.
The diaper according to claim 1 or 2, wherein the tack is formed by partially joining portions where the innermost sheets overlap when the diaper is folded along the lateral center line.
The innermost sheet is a state in which an hourglass-shaped sheet piece having a planar shape is folded on the transverse center line, and the sheet piece is elastic in the lateral direction at a portion located in the front and rear waist area. In the portion located in the crotch region, at least a portion along the horizontal center line is formed so as not to expand or contract in the lateral direction, either elastically or inelastically. The diaper according to any one of claims 1 to 3.
The body fluid absorbing portion is a panel-shaped member, and any one of the inner surface side sheet and the outer surface side sheet extending from a peripheral portion of the core member is joined to the outer surface of the innermost sheet. The diaper according to any one of 4 to 4.
The manufacturing method of the said diaper characterized by the following process being included in the manufacturing process of the diaper which has at least the said back opening part of the said front opening part and the said back opening part at least:
(1) A step of continuously supplying a sheet continuous body having a predetermined width for obtaining the innermost sheet in the machine direction;
(2) The rear openings are arranged at regular intervals in the machine direction at positions spaced apart in the cross direction from a center line that bisects the width located in the cross direction perpendicular to the machine direction of the sheet continuum. The step of forming sequentially,
(3) The body fluid absorbing portion is joined to one surface of both surfaces of the sheet continuum in such a manner that the core material covers the rear opening and extends in the intersecting direction across the center line. Process,
(4) Any one of the surface opposite to the one surface of the sheet continuum, the portion between the center line and the rear opening, and the portion that is symmetrical with respect to the center line. Applying a hot melt adhesive;
(5) Sequentially extending the sheet continuum along the portions that are joined to the sheet continuum and extend in the intersecting direction between the adjacent body fluid absorbing portions and are arranged at regular intervals in the machine direction A step of cutting, and (6) a step of joining the sheet continuums folded in half along the portion before the step of cutting the sheet continuums.
The manufacturing method according to claim 6, further comprising the step of sequentially forming the front openings at the predetermined interval in the machine direction at a portion opposite to the rear openings with respect to the center line with respect to the sheet continuum. .
The manufacturing method according to claim 6 or 7, further comprising a step of applying an adhesive for joining the one surface and the body fluid absorbing portion onto the center line of the one surface in the sheet continuous body.