WO2009119195A1 - Disposable diaper - Google Patents

Abstract

A wearing article in which non-contractible regions on which contracting force of elastic members does not act are formed in front and rear waist belts and in which the elastic members do not protrude from the non-contractible regions and are not caught by the non-contractible regions. Laterally extending waist elastic bodies (18) are mounted in the vertical direction (Y) to front and rear waist belt members (5, 6). The waist elastic bodies (18) form non-contractible regions (35), on which contracting force of the waist elastic bodies does not act, so as not to superpose on those portions of thermally fused sheets (16, 17) on which graphics are formed. The non-contractible regions (35) are formed in the center portions in the lateral direction (X) of the front and rear waist belt members (5, 6) without applying an adhesive agent between inner and outer sheets (12, 13; 14, 15) but by cutting the waist elastic bodies (18) mounted in position in a stretched state. At crotch-side edges (21, 22) of the non-contractible regions (35), the inner and outer sheets (12, 13; 14, 15) are joined to each other by heat sealing to form joined sections (36).

Description

Disposable diapers

The present invention relates to a disposable diaper, and more particularly, to a disposable diaper having suitable fit and good appearance.

Conventionally, as a disposable diaper in which a waist belt is connected with an absorbent main body to form a pull-on pants, for example, Japanese Patent Laid-Open No. 2006-525858 (Patent Document 1) is known. According to Patent Document 1, front and rear waist regions are formed by front and rear waist belts extending in the lateral direction, and the front and rear waist belts are connected by an absorbent main body extending in the vertical direction to form a crotch region. The front and rear waist belts include an inner layer sheet positioned on the inner surface of the body side and an outer layer sheet positioned on the outer surface of the clothing side, and a plurality of elastic members extending in the lateral direction are provided between the inner and outer layer sheets from the upper ends of the front and rear waist belts. It is attached in an extended state over the lower end. Furthermore, a patch on which graphics are printed is provided between the inner and outer layer sheets.

In the diaper as described above, the contraction force of the elastic member is prevented from acting on the portion where the graphic is printed so that the graphic can be seen well. That is, the elastic member is joined between the inner and outer layer sheets by an adhesive, but the adhesive is not applied to the portion where the graphic is printed, and the elastic member is cut in the non-application area of the adhesive. I am going to do that. Therefore, in the non-application area, the contraction force of the elastic member does not act, and it is possible to suppress the graphics from becoming difficult to see due to wrinkles.

Moreover, in order to ensure the fit property to a wearer's body, the disposable diaper which has the multiple waist elastic element extended in the circumference direction of a waist in the front-back waist region is generally known. For example, as shown in FIGS. 14 (a) and 14 (b), Patent Document 2 discloses that a longitudinal waist region, a crotch region, an absorbent chassis 112 disposed on the inner surface of the waist member 111, and a waist opening edge 116 a Disclosed is a disposable diaper 110 having a plurality of waist elastic elements 126 extending in a direction spaced apart by a given dimension and waist elastic elements extending from the side edges of the front and rear waist regions to the side edges of the absorbent chassis 112.
JP 2006-525858 A JP 2002-248127 A

In the front and rear waist belts in Patent Document 1, the elastic member is joined together with the inner and outer layer sheets by an adhesive applied between the inner and outer layer sheets. However, since the adhesive is not applied in the non-joining region, the inner and outer layer sheets are not joined. Since the inner and outer layer sheets are not joined, the inner and outer layer sheets open in the non-joined region, and there is a possibility that the elastic member cut from the opening protrudes or the wearer gets caught between the inner and outer layer sheets.

According to the first aspect of the present invention, there is provided a wearing article that forms a non-shrinkable region where the elastic member does not act on the front and rear waist belts, and the elastic member does not protrude from the non-shrinkable region or get caught in the non-shrinkable region. The task is to do.

In the invention disclosed in Patent Document 2, the waist elastic element 126 does not cross the absorbent chassis 112. Accordingly, the contraction force of the waist elastic element 130 does not directly act on the absorbent core 144 included in the absorbent chassis 112 and the absorbent core 144 does not wrinkle, so that the absorbent performance is not greatly deteriorated.

However, referring to FIG. 14A, when the diaper 110 is worn, the front end flap 162 of the absorbent chassis 112, that is, the portion where the absorbent core 144 does not exist in the absorbent chassis 112 and the body A of the wearer. A space S is formed between them. This is because the absorbent core 144 usually includes fluff pulp or the like for improving its liquid absorbency and diffusibility, has a given thickness compared to the front end flap 162 made of only a sheet member, and has a waist elasticity This is because the portion located between the waist opening edge portion 116 a where the element 126 is disposed and closely contacts the wearer's body A and the absorbent core 144 is separated. In particular, when the absorbent core 144 absorbs a large amount of urine, the thickness of the absorbent core 144 increases and the space S becomes larger.

In such a state, when the wearer bends forward, etc., the wearer's body A pushes the waist opening edge 116a and its vicinity forward, so the front end flap 162 and the waist member in a position facing it. The portion 111 is bent toward the space S, and as shown in FIG. 14 (b), the portion R is displaced between the wearer's body A and the absorbent core 144, resulting in a step R.

Even if the waist elastic element 126 is disposed on the front end flap 162, the absorbent core 144 increases in thickness by absorbing a large amount of urine as described above. The front end portion and the portion of the waist member 111 opposite to the front end portion are shifted upward on the front end flap 162 that is in close contact with the wearer's body A, and the front end flap 162 and the portion of the waist member opposite thereto are shifted to the space S. Like the state, that is, the state shown in FIG.

The step R not only detracted from the appearance of the diaper 110 but also caused urine that could not be absorbed by the absorbent core 144 to accumulate therein, causing excrement to leak to the outside.

Accordingly, in the second invention, during wearing of the diaper, at least a front end flap of the absorbent chassis and a portion of the front waist panel at a position facing the front end flap are displaced between the wearer's body and the absorbent core. Since there is no step in a part of the front waist region, it is an object to provide a disposable diaper that excretes are not leaked to the outside and that is good in appearance.

Furthermore, in the third invention, during wearing of the diaper, there is no step due to the front end flap of the absorbent chassis slipping out of the part of the front waist region or the absorbent core slipping up. It is an object to provide a disposable diaper that has no risk of leakage to the outside and that also looks good.

The present invention includes first to third inventions.
The first invention includes a longitudinal direction and a lateral direction, a body-side inner surface and a clothing-side outer surface, a front waist region, a rear waist region, and a crotch region located between the front and rear waist regions, and the front and rear waists. A waist belt member that defines a region, and a crotch member that defines a portion of the front and rear waist regions and the crotch region, wherein the waist belt member extends in the lateral direction and faces the longitudinal direction A plurality of waist elastic bodies including a side edge and a crotch side edge and extending in the lateral direction and spaced apart in the longitudinal direction are attached to the waist belt member in an extended state, and a part of the waist belt member In connection with improvement of the disposable diaper which forms the non-contraction area | region where the contraction force of the said waist elastic body does not act.

In the diaper according to the first aspect, the non-shrink region is formed along at least one of the waist side edge and the crotch side edge. The waist belt member includes an inner surface sheet that forms a body side inner surface and an outer surface sheet that forms a clothing side outer surface, and the waist side edge and the crotch side edge where the non-shrink region is formed include: A joining portion for joining the inner and outer surface sheets is formed.

The first invention includes the following preferred embodiments in addition to the characteristic configuration.
(1) The waist belt member and the crotch member are formed in an overlapping region.
(2) The waist belt member includes a heat-fusible sheet disposed between the inner and outer surface sheets, and the joining portion is formed by heat-sealing through the heat-fusible sheet.
(3) A graphic is formed on the clothing side of the heat-fusible sheet, and the graphic is visible through the outer sheet in the non-shrinkable region.
(4) A part of the waist elastic body extends along the crotch side edge, the non-shrink region is formed along the crotch side edge, and the waist elastic body is formed in the non-shrink region. Cut at the position where it is located.
(5) The crotch member includes a liquid absorbing structure.

In order to solve the above-mentioned problem, the second invention is directed to the vertical direction and the horizontal direction, the skin contact surface and the non-skin contact surface, the front waist region, the rear waist region, and the front and rear. A crotch region located between the waist regions, a waist opening and a pair of leg openings, an annular elastic waist panel forming the front and rear waist regions, and a front and rear portion of the waist panel, and from the crotch region to the front and rear waists A disposable diaper that extends to a region and includes an absorbent core and an absorbent chassis having front and rear end flaps extending in the longitudinal direction from front and rear end edges of the absorbent core.

The feature of the second invention is that at least the front waist region of the front and rear waist regions has a stretch region extending at least in the lateral direction, and the stretch region is an edge of the waist opening. A first stretchable area extending in the lateral direction in the vicinity of the front end flap of the absorbent chassis from a portion, a second stretchable area extending in the lateral direction adjacent to the first stretchable area, and adjacent to the second stretchable area And a pair of thirds that extend from the side edge of the front waist region to both side portions of the absorbent chassis, and that are spaced apart from each other in the lateral direction on both sides of the non-stretchable region formed at the lateral center of the front waist region. The second stretchable region crosses the front end flap of the absorbent chassis.

The second invention includes the following preferred embodiments in addition to the characteristic configuration.
(1) The extension stress of the second stretch region is equal to or greater than the extension stress of the first stretch region.
(2) The correlation of the elongation stress between the first stretchable region, the second stretchable region, and the third stretchable region is second stretchable region ≧ first stretchable region> third stretchable region.
(3) A plurality of strand-like waist elastic elements extending in the lateral direction are disposed in the first, second, and third stretch regions, and the waist elastic elements that form the first stretch region and the The waist elastic element that forms the second stretchable region is an elastic element having an equivalent expansion ratio.
(4) In the first, second and third stretchable regions, a plurality of strand-like waist elastic elements extending in the lateral direction are arranged, and the waist elastic elements are all made of the same elastic element.

In order to solve the above-mentioned problem, the third invention is directed to the longitudinal direction and the lateral direction, the skin contact surface and the non-skin contact surface, the front waist region, the rear waist region, and the front and rear. A crotch region located between the waist regions, a waist opening and a pair of leg openings, an annular elastic waist panel forming the front and rear waist region, and a front and rear portion of the elastic waist panel, and from the crotch region to the front and rear A disposable diaper including an absorbent panel extending to a waist region and having an absorbent core and an absorbent chassis having front and rear end flaps extending from the front and rear end edges of the absorbent panel in the longitudinal direction.

A feature of the third aspect of the invention is that at least the front waist region of the front and rear waist regions has an elastic region extending at least in the lateral direction, and the elastic region is an edge of the waist opening. A first stretchable region extending in the lateral direction at a front end portion including the front end flap of the absorbent chassis from a portion, adjacent to the first stretchable region, and a front end portion of the absorbent panel from a side edge of the front waist region Adjacent to the second stretchable region and a pair of second stretchable regions extending to both sides of the front waist region and spaced apart from each other in the lateral direction on both sides of the first non-stretchable region formed at the central portion in the lateral direction of the front waist region And a pair of third stretch regions extending from the side edge of the front waist region to both sides of the front end portion of the absorbent panel and facing and spaced apart in the lateral direction on both sides of the first non-stretch region. The first The elasticized zone is across the front end of the absorbent panel is.

The third invention includes the following preferred embodiments in addition to the characteristic configuration.
(1) The extension stress of the second stretch region is equal to or greater than the extension stress of the first stretch region.
(2) The correlation of the elongation stress between the first stretchable region, the second stretchable region, and the third stretchable region is second stretchable region ≧ first stretchable region> third stretchable region.
(3) A plurality of strand-like waist elastic elements extending in the lateral direction are arranged in the first, second and third stretchable regions, and the waist elastic elements all have an equal expansion ratio. Formed from.
(4) A plurality of strand-like waist elastic elements extending in the lateral direction are arranged in the first to third stretchable regions, and the waist elastic elements are all made of the same elastic element.
(5) The stretchable region in the rear waist region is adjacent to the fourth stretchable region and the fourth stretchable region extending in the lateral direction along the edge of the waist opening between both side edges of the rear waist region. The fifth stretchable region extending to the rear edge of the absorbent panel, and on both sides of the second non-stretchable region, which is adjacent to the fifth stretchable region and formed in the lateral center of the rear waist region, It is divided into a pair of sixth stretchable regions that are opposed to each other in the lateral direction and a pair of seventh stretchable regions that are adjacent to the sixth stretchable region and that are opposed to each other in the lateral direction on both sides of the second non-stretchable region. And the extension stress of the sixth extension region is larger than the extension stress of the seventh extension region, and the extension stress of the fourth extension region and the fifth extension region is the extension stress of the sixth extension region. Bigger than.

According to the first invention, the waist belt member includes an inner surface sheet that forms the body side inner surface and an outer surface sheet that forms the clothing side outer surface. A non-shrinkable region where a contraction force of the waist elastic body does not act is formed in a part of the waist belt member, and a joint portion for joining the inner and outer sheet is formed on the waist side edge or the crotch side edge of the non-shrinkable region. As a result, it is possible to prevent the inner and outer sheet from opening in the non-shrinkable region. Since the opening is not formed, the cut waist elastic body can be prevented from jumping out, and further, the wearer or the like can be prevented from being caught.

Since the non-shrinkable region is formed in a region where the waist belt member and the crotch member overlap, it is possible to prevent the contraction force of the waist elastic body from acting on the crotch member. Therefore, wrinkles can be prevented from occurring in the crotch member.

Since the waist belt member includes a heat-fusible sheet between the inner and outer surface sheets, and the joint portion is formed by heat-sealing via the heat-fusible sheet, an adhesive is separately used for forming the joint portion. Etc. need not be used. Therefore, the cost can be reduced, and the joining portion can be easily formed without an adhesive application step.

A graphic is formed on the clothing side of the heat-fusible sheet so that the graphic can be visually recognized through the outer sheet in the non-shrinkable region. Since the graphic is formed in the non-shrinkable region, it is possible to suppress the graphic from being difficult to see due to the formation of the fold.

Since a part of the waist elastic body is attached along the edge of the crotch side, adhesion to the wearer can be improved on the crotch region side, and leakage of body fluids and the like can be suppressed. Since the non-shrink region is formed along the crotch side edge, the contraction force of the waist elastic body does not act between the non-shrink region and the crotch side edge. Therefore, wrinkles are not generated between the waist belt member and the crotch member. Since the waist elastic body is cut at the portion located in the non-shrinkable region, the contraction force of the waist elastic body can be easily prevented from acting. In addition, after attaching the elastic waist, it is cut to prevent contraction force, so even if some elastic waist is attached along the crotch side edge, this crotch side edge The non-shrinkable region can be easily formed along

Since the crotch member includes the liquid absorbing structure, the non-shrinkable region overlaps the liquid absorbing structure, so that no wrinkles are formed in the liquid absorbing structure and suppress leakage of body fluids and the like. Can do.

In the second invention, the waist elastic element extending in the lateral direction of the front end flap of the absorbent chassis is disposed in at least the front waist region of the front and rear waist regions. Can be adhered to. Thereby, since a front end flap does not slip | deviate between a wearer's body and an absorptive core, excrement does not leak, but a disposable diaper which is good also in appearance can be obtained.

In the third invention, since the first stretchable region is transverse to the front end flap of the absorbent chassis and the front end portion of the absorbent panel, the front end flap of the absorbent chassis slips down while the absorbent chassis is worn. Or a step due to the absorbent panel being displaced does not occur, excrement is not leaked to the outside, and an appearance-friendly disposable diaper can be obtained.

The perspective view of the diaper which concerns on 1st invention. The expansion | deployment top view of the diaper of FIG. FIG. 3 is an end view taken along line III-III in FIG. 2. The perspective view of the disposable diaper which concerns on 2nd invention. The partially broken expansion | deployment top view of the diaper of FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG. 5. The figure of the state which removed the absorptive chassis of FIG. The VIII-VIII sectional view taken on the line of the typical FIG. 5 which shows the wearing condition of a disposable diaper. The perspective view of the disposable diaper which concerns on 3rd invention. The expansion | deployment top view of the disposable diaper of FIG. XI-XI sectional view taken on the line of FIG. The figure of the state which removed the absorptive chassis (except an absorptive panel) of FIG. Fig. 11 is a schematic cross-sectional view taken along line XIII-XIII in Fig. 10 showing a wearing state of the disposable diaper. (A) (b) Typical sectional drawing corresponding to Drawing 8 and Drawing 13 showing the wearing state of the conventional disposable diaper.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Diaper 5 Front waist belt member 6 Rear waist belt member 7 Crotch member 12 Inner surface sheet 13 Outer surface sheet 14 Inner surface sheet 15 Outer surface sheet 16 Thermal fusion sheet 17 Thermal fusion sheet 18 Waist elastic body 19 West side edge 20 West side edge Edge 21 Crotch side edge 27 Liquid absorbing structure 35 Non-shrinkable region 36 Joint 210 Disposable diaper 211 Elastic waist panel 212 Absorbent chassis 213 Front waist region 214 Rear waist region 215 Crotch region 219 Side edge 220 of front waist region Rear waist Side edge 223 Waist opening 223a Waist opening edge 224 Leg opening 225 First stretchable area 226 Second stretchable area 227 Third stretchable area 228A Non-stretchable area (first non-stretchable area)
230 first waist elastic element 231 second waist elastic element 232 third waist elastic element 262 front end flap 263 rear end flap 310 disposable diaper 311 elastic waist panel 312 absorbent chassis 313 front waist region 314 rear waist region 315 crotch region 316 waist opening 317 Leg opening 318c Front waist side edge 326 First waist elastic element 327 Second waist elastic element 328 Third waist elastic element 329 Fourth waist elastic element 330 Fifth waist elastic element 331 Sixth waist elastic element 332 Seventh waist Elastic element 333 First stretchable region 334 Second stretchable region 335 Third stretchable region 336 Fourth stretchable region 337 Fifth stretchable region 338 Sixth stretchable region 339 Seventh stretchable region 340A, 340B Non-stretchable region 344 Absorbent core 3 46 Absorbent Panel 346a Absorbent Panel Front Edge 346b Absorbent Panel Rear Edge 346c Absorbent Panel Side Edge 347 Absorbent Panel Front End 348 Absorbent Panel Rear End

An example of the disposable diaper of the first invention will be described.

FIG. 1 shows a state when a so-called pull-on / pants-type diaper is worn, and a part of the diaper is cut away for the sake of explanation. As illustrated, the diaper 1 includes a front waist region 2, a rear waist region 3, and a crotch region 4 positioned between the front and rear waist regions 2 and 3. A direction extending from the front waist region 2 to the rear waist region 3 via the crotch region 4 is defined as a vertical direction Y, and a direction orthogonal to the vertical direction Y is defined as a horizontal direction X.
The front and rear waist regions 2 and 3 are formed by front and rear waist belt members 5 and 6, respectively, and the crotch region 4 is formed by a crotch member 7.

The front and rear waist belt members 5 and 6 include a front side edge portion 8 and a rear side edge portion 9 that face the horizontal direction X and extend in the vertical direction Y. The front and rear side edges 8 and 9 face each other and are joined at a plurality of joints 10 that are intermittently arranged in the longitudinal direction Y, whereby an annular waist opening 11 is formed.
The front waist belt member 5 includes an inner sheet 12 that forms a body-side inner surface, an outer sheet 13 that forms a clothing-side outer surface, and a heat-sealing sheet 16 that is positioned between the inner and outer sheets 12 and 13. The rear waist belt member 6 includes an inner sheet 14 that forms a body-side inner surface, an outer sheet 15 that forms a clothing-side outer surface, and a heat-sealing sheet 17 positioned between the inner and outer sheets 14 and 15. On the clothing side of the heat-sealing sheets 16 and 17, a graphic is formed substantially in the center in the lateral direction X, and this graphic is visible through the outer surface sheets 13 and 15.

A plurality of waist elastic bodies 18 are attached between the heat sealing sheets 16 and 17 and the inner surface sheets 12 and 14. The waist elastic body 18 is spaced apart in the longitudinal direction Y and extends in the lateral direction X and is attached in an extended state. The waist elastic body 18 is attached to at least one of the inner surface sheets 12 and 14 and the heat-sealing sheets 16 and 17 with an adhesive (not shown). It is joined. The front and rear waist belt members 5 and 6 are respectively formed with waist side edges 19 and 20 and crotch side edges 21 and 22 that face the longitudinal direction Y and extend in the lateral direction X, and the waist elastic body 18 has a waist side edge. 19 and 20 to crotch side edges 21 and 22. The waist elastic body 18 located at the upper part of the drawing in the longitudinal direction Y is attached along the waist side edges 19 and 20, and the one located at the lower part of the drawing in the longitudinal direction Y is attached to the crotch side edges 21 and 22. Attached along. That is, the waist elastic body 18 is attached over the crotch side edges 21 and 22 from the waist side edges 19 and 20. However, the waist elastic body 18 is not located in the part which overlaps the graphic of the heat-fusion sheet | seats 16 and 17. FIG.

Between the front and rear waist belt members 5 and 6, a crotch member 7 is formed so as to connect the front and rear waist belt members 5 and 6 in the longitudinal direction Y. That is, the front end edge 7 a of the crotch member 7 is joined to the front waist belt member 5, and the rear end edge 7 b is joined to the rear waist belt member 6. By joining the front and rear waist belt members 5 and 6 and the crotch member 7 in this way, the leg openings 24 are formed by the crotch side edges 21 and 22 of the front and rear waist belt members 5 and 6 and the side edges 23 of the crotch member 7. It is formed.

FIG. 2 is a plan view in which the joint portion 10 of the diaper 1 of FIG. 1 is unbonded so that the contraction force of each elastic body does not act, and a part thereof is broken for explanation. 3 is an end view taken along line III-III in FIG. As illustrated, the outer surface sheet 13 of the front waist belt member 5 is folded back to the wearer side at the waist side edge 19 to form a folded portion 25. The front end edge 7 a of the crotch member 7 is covered by the folded portion 25. Similarly, the outer surface sheet 15 of the rear waist belt member 6 is also folded at the waist side edge 20 to form a folded portion 26, and the folded portion 26 covers the rear end edge 7 b of the crotch member 7.

The crotch member 7 includes a liquid absorption structure 27. The liquid-absorbing structure 27 includes a liquid-absorbent core material 28 composed of a mixture of fluff pulp and superabsorbent polymer particles, a liquid-absorbing diffusion sheet 29 such as tissue paper that wraps the core material 28, and a liquid-absorbing structure. A liquid-permeable body-side liner 30 that further covers the body side of the diffusion sheet 29 and a clothing-side outer 31 that further covers the clothing side of the liquid-absorbing diffusion sheet 29 are included. Further, a leakage preventing sheet 32 made of a moisture-permeable plastic film is disposed between the clothing side of the liquid absorbing diffusion sheet 29 and the clothing side outer 31. The leakage prevention sheet 32 is approximately the same size as or larger than the core material 28, and prevents body fluid absorbed by the core material 28 from leaking. By covering the front and rear end edges 7a and 7b of the crotch member 7 including such a liquid absorbing structure 27 with the folded portions 25 and 26 of the outer surface sheets 14 and 15, the core material 28 is prevented from spilling.
Between the body side liner 30 and the clothing side outer 31, a plurality of leg elastic bodies 33 extending in the longitudinal direction Y are attached in an extended state.

The core material 28 and the liquid-absorbing diffusion sheet 29 that encloses the core material 28 are curved so as to be convex toward the inner side in the lateral direction X at the approximate center in the longitudinal direction Y. By setting it as such a shape, when the diaper 1 is worn, the diaper 1 fits around a wearer's leg. When worn, the body side liner 30 and the clothing side outer 31 extending from both sides of the core member 28 in the lateral direction X rise to the body side to form a wall that prevents leakage. In addition, the wall which prevents a leak can also be formed by forming the leak prevention cuff separately on the body side of the crotch member 7.

In the diaper 1 as described above, as shown in FIG. 1, the waist elastic body 18 is attached to the front and rear waist belt members 5 and 6 in the longitudinal direction Y, and the waist elastic body 18 is heat-sealed. The sheets 16 and 17 are not overlapped with the portion where the graphic is formed. That is, the elastic waist 18 prevents the contraction force from acting on the portion where the graphic is formed. Thus, the non-contraction area | region 35 which does not act the contraction force of the waist elastic body 18 partially is formed.

The non-shrinkable region 35 is not stretched in the non-shrinkable region 35 without applying an adhesive between the inner and outer surface sheets 12, 13 and 14, 15 in the central portion of the front and rear waist belt members 5 and 6 in the lateral direction X. It is formed by cutting the waist elastic body 18 attached in (1). That is, in the inner and outer sheet 12, 13, 14 and 15, the adhesive is applied in the vicinity of the waist side edges 19 and 20 and in the vicinity of the front and rear side edges 8 and 9, and in the vicinity of the crotch side edges 21 and 22. In the central portion in the lateral direction X, no adhesive is applied and a non-shrinkable region 35 is formed.
In such a non-shrink region 35, the inner and outer surface sheets 12, 13 and 14, 15 are not joined, and the crotch side edges 21, 22 are also not joined. Therefore, at the crotch side edges 21 and 22, the inner and outer surface sheets 12, 13 and 14, 15 are joined by heat sealing so that the joined portion 36 is formed.

In the diaper 1 having the non-shrinkable region 35 as described above, since the adhesive is not applied in the non-shrinkable region 35, the rigidity of the non-shrinkable region 35 does not increase and the wearer is flexible. Can be maintained. Moreover, since the contraction force of the waist elastic body 18 does not act on the non-contraction region 35, the generation of wrinkles can be suppressed in this region. Since no wrinkles occur, the graphics will not be difficult to see. Since the liquid absorbing structure 27 is joined to the non-shrinkable region 35 so as to overlap, the contraction force of the waist elastic body 18 does not act on the liquid absorbing structure 27 in the overlapping portion, and the liquid absorbing structure 27 Formation of wrinkles in the structure 27 can be suppressed. Therefore, it is possible to prevent body fluid from leaking due to the wrinkles of the liquid absorbing structure 27.

Since the joint portions 36 are formed at the crotch side edges 21 and 22 of the non-shrinkable region 35, the inner and outer surface sheets 12, 13 and 14, 15 do not open toward the crotch region 4. Therefore, it can prevent that the edge part of the cut | disconnected waist elastic body 18 protrudes from between the inner-outer surface sheet | seats 12,13 and 14,15, and a wearer etc. are caught in these.
In addition, since a part of the waist elastic body 18 is attached along the crotch side edges 21 and 22, particularly when the opening is made, the end of the elastic body 18 tends to protrude, but this is prevented. can do. In addition, by attaching the waist elastic body 18 along the crotch side edges 21 and 22, when forming the non-shrinkable region 35, it is not possible to apply an adhesive to the crotch side edges 21 and 22. The problem that an opening is formed at the crotch side edges 21 and 22 becomes significant. However, even in this case, the opening is not formed by forming the joint portion 36.

By cutting the waist elastic body 18 attached along the crotch side edges 21 and 22 to form the non-shrinkable region 35, generation of wrinkles at the boundary portion with the crotch member 7 can be suppressed. When the crotch member 7 and the front and rear waist belt members 5 and 6 are joined at this boundary portion, it is possible to suppress a reduction in joining strength due to wrinkles. Further, if wrinkles occur at this boundary portion, wrinkles may become more conspicuous by contrast with the crotch member 7, but this can also be prevented.

The reason for attaching the waist elastic body 18 along the crotch side edges 21 and 22 is that the crotch region 4 side end portions of the front and rear waist belt members 5 and 6 can be adhered to the skin of the wearer. To do. Thus, body fluid, such as urine, can be prevented from leaking out of the diaper 1 by bringing it into close contact with the wearer's skin on the crotch region 4 side. Another reason is to increase the strength of the crotch side edges 21 and 22. Although the crotch side edges 21 and 22 are easily subjected to friction due to the wearer's skin and clothes, by attaching the waist elastic body 18, it can be prevented from being broken by friction. The waist elastic body 18 attached along the crotch side edges 21 and 22 is preferably formed at a position within about 15 mm from the crotch side edges 21 and 22 toward the waist side edges 19 and 20.

The non-shrinkable region 35 can be formed simply by cutting the waist elastic body 18 attached in the stretched state, and the formation thereof is easy. Moreover, since it is only necessary to cut in this way, even when the waist elastic body 18 is attached to the crotch side edges 21 and 22, the non-shrinkable region 35 can be easily formed.
Since the heat-sealing sheets 16 and 17 are formed between the inner and outer sheets 12, 13, and 14, 15, the joining portion 36 is easily formed by heat sealing without separately applying an adhesive. be able to. However, it is not limited to heat sealing, but may be joined by sonic sealing, or an adhesive may be applied to bond the inner and outer surface sheets 12, 13 and 14, 15.

A graphic is formed at the center of each of the front and rear waist belt members 5 and 6. Therefore, the graphic can be visually recognized in both the front and rear waist regions 2 and 3. However, the graphic may be formed on only one of them, or the graphic may not be formed. In addition, the non-shrinkable region 35 is also formed on the front and rear waist belt members 5 and 6 in accordance with the formation of the graphic, but it may be formed on only one of them, and is the graphic formed? Regardless of whether or not, the non-shrinkable region 35 can be formed.

The joining portion 36 is desirably formed at a position within about 10 mm from the crotch side edges 21 and 22 toward the waist side edges 19 and 20. By adopting such a positional relationship, the portions where the inner and outer surface sheets 12, 13 and 14, 15 are not joined to each other at the crotch side edges 21, 22 can be reduced.
In addition, the joint portion 36 is formed on the crotch side edges 21 and 22, but when the non-shrink region 35 is formed on the waist side edge edges 19 and 20, the joint portion 36 is also on the waist side edge. It can be formed at the edges 19, 20.
In this embodiment, a pull-on / pants-type diaper is described. However, the present embodiment can be applied to a so-called open-type diaper.

An example of the disposable diaper of the second invention will be described.

FIG. 4 is a perspective view showing a wearing state of the diaper 210. FIG. 5 is a partially broken developed plan view when the diaper 210 is peeled back and forth at the seam portion 222 and extended in the longitudinal direction X and the transverse direction Y, and FIG. 6 is a sectional view taken along line VI-VI in FIG. . FIG. 7 is a partially cutaway view showing a state where the absorbent chassis 212 is removed in FIG.

As shown in FIG. 4, the diaper 210 includes an annular elastic waist panel 211, an absorbent chassis 212 attached to the skin contact surface side of the annular elastic waist panel 211, a front waist region 213, and a rear waist region 214. And a crotch region 215 extending in the longitudinal direction X between the front and rear waist regions 213 and 214.

The elastic waist panel 211 includes a rectangular front waist panel 216 that forms the front waist region 213 and a substantially trapezoidal rear waist panel 217 that forms a part of the rear waist region 214 and the crotch region 215. . Both side edges of the front waist panel 216 and the rear waist panel 217 (both side edges of the front and rear waist regions) 219, 220 are overlapped with each other, and a known joining means such as a seam portion 222 arranged intermittently in the longitudinal direction X, for example, A waist opening 223 and a pair of leg openings 224 are defined by being joined by various heat welding means such as hot embossing and sonic.

As shown in FIGS. 4 and 7, the front and rear waist regions 213 and 214 are adjacent to the first stretchable region 225 extending in the lateral direction Y along the waist opening edge 223 a and the first stretchable region 225, and the absorbent chassis 212. A pair of second stretchable regions 226 that cross the front end of the first and second non-stretchable regions 228A and 228B that are located in the middle of the lateral direction Y of the front and rear waist regions 213 and 214 and that are opposed to each other in the lateral direction Y. The third elastic region 227 is divided into the elastic regions 225, 226, and 227, and the strand-like waist elastic elements 230, 231, and 232 are disposed therein.

Specifically, a plurality of first waist elastic elements 230 extending along the waist opening edge 223a are disposed in the first stretchable region 225, and the absorbent chassis 212 is disposed in the second stretchable region 226. A plurality of second waist elastic elements 231 extending in the lateral direction Y are arranged, and a plurality of second waist elastic elements 231 extending in the lateral direction Y at both side portions 213a, 214a of the front and rear waist regions 213, 214 are arranged in the third stretchable region 227. A three-waist elastic element 232 is arranged. A large number of gathers 233 are formed on the surface of the diaper 210 by contraction of the waist elastic elements 230, 231, 232 (see FIG. 4). Note that at least only the first non-stretchable region 228A of the first and second non-stretchable regions 228A and 228B may be formed. In addition, a pair of fourth stretch regions 234 that are spaced apart in the lateral direction Y are formed on both sides of the second non-stretch region 228B at a portion constituting a part of the crotch region 215 of the rear waist panel 217. In the stretchable region 234, a plurality of fourth waist elastic elements 235 extending in the lateral direction Y are arranged.

As shown in FIGS. 5 and 6, the front and rear waist panels 216 and 217 are formed of an inner layer sheet 240 located on the skin contact surface side and an outer layer sheet 241 located on the non-skin contact surface side. The outer layer sheet 241 has extending portions 243 extending from the front and rear end edges 240a and 240b of the inner layer sheet 240 in the longitudinal direction X. The extending portions 243 include the front waist panel 216 and the rear waist panel 217. After the absorptive chassis 212 is disposed on the inner side of the diaper, the absorbent chassis 212 is folded back to the skin contact surface side of the diaper and joined to both side portions 213a and 214a. Thus, since the extension part 243 of the outer layer sheet 241 covers the front and rear end edges 240a and 240b of the inner layer sheet 240, it is possible to suppress excrement from leaking out from the front and rear end edges 240a and 240b. .

For the inner layer sheet 240 and the outer layer sheet 241, a hydrophobic fiber nonwoven fabric, a moisture permeable plastic film, and a laminate sheet thereof are preferably used.

Waist elastic elements 230, 231, 232, and 235 are interposed between the inner layer sheet 240 and the outer layer sheet 241, and a hot melt adhesive (at least on the inner surface of the inner layer sheet 240 of both sheets 240 and 241). (Not shown) is attached to be stretchable. However, the waist elastic elements 230, 231, 232, and 235 are not disposed between the inner layer sheet 240 and the outer layer sheet 241 in the first and second non-stretchable regions 228A and 228B.

As shown in FIGS. 5 and 6, the absorbent chassis 212 includes a liquid absorbing structure 245. The liquid-absorbing structure 245 includes a liquid-permeable body side liner (top sheet) 246, a liquid-impermeable back sheet 247, an absorbent core 248 having a sufficient capacity for absorbing body fluid, and an absorbent core 248. And an absorbent panel 250 having a liquid diffusive sheet 249 to be wrapped.

The liquid-absorbent structure 245 has a back sheet 247 extending from the front and rear end edges 250a and 250b of the absorbent panel 250 outward in the vertical direction X and a body side liner 246 extending further outward in the vertical direction X than the back sheet 247. An end flap extending in the lateral direction Y formed by being joined via a melt adhesive (not shown), and a body side liner 246 extending outward in the lateral direction Y from a pair of side edges 250c of the absorbent panel 250; A pair of inner side flaps 254 that are formed by joining the back sheet 247 via a hot melt adhesive (not shown) and extend in the longitudinal direction X, and in the longitudinal direction on both sides of the liquid-absorbing structure 245 A pair of barrier leg cuffs 255 extending to X.

The absorbent chassis 212 also includes a first sheet member 258 fixed to the lower surface of the liquid absorbent structure 245 via a hot melt adhesive application region 256, and the liquid absorbent structure 245 of the first sheet member 258. A pair of sleeve-shaped outer side flaps formed by folding portions Y 258 a extending outward in the lateral direction Y of the inner side and folding the portions overlapping each other via a hot melt adhesive 260. 261. Each outer side flap 261 covers the outer edge of each inner side flap 254. Since the outer edge of each inner side flap 254 is covered with each outer side flap 261, the outer edge of each inner side flap 254, which is usually the cutting edge of the sheet, comes into contact with the wearer's skin. Without irritation, it is possible to prevent itching and rash.

In the absorbent chassis 212, since the first sheet member 258 is fixed to the lower surface of the liquid-absorbing structure 245 as described above, the portion extending from the back sheet 247 of the body side liner 246 to the outside in the longitudinal direction X. And front and rear end flaps 262 and 263 made of only the sheet member formed by the front and rear end edges of the first sheet member 258.

A strand-like elastic element 267 extending in the longitudinal direction X so as to be shrinkable is attached to the inside of the sleeve of each outer side flap 261 via a hot melt adhesive (not shown). As a result, when the diaper 210 is worn, the outer side flap 261 is curved inward in the lateral direction Y by the contraction of the elastic element 267 and is elastically pressed against the wearer's thigh. In the present embodiment, there is one elastic element 267, but a plurality of strips may be arranged as necessary.

Each barrier leg cuff 255 is formed of an extended portion 258a of the first sheet member and a second sheet member 264 folded in two, and the overlapping edge portion of the second sheet member 264 is hot. It has a fixing portion 265 fixed to the extending portion 258a via a melt adhesive (not shown), and a sleeve-like free edge portion 266 formed from a bent portion of the second sheet member 264. The free edge portion 266 faces the extending portion 258a of the first sheet member 258 in the unfolded state of the diaper 210, and three elastic elements 268, 269, 270 extending in the longitudinal direction X are hot on the inner surface thereof. It is fixed via a melt adhesive (not shown). When the diaper 210 is worn, the elastic elements 268, 269, and 270 are extended, the free edge 266 is separated from the extending portion 258a of the first sheet member 258, and excrement is exposed from both sides of the absorbent chassis 212 to the outside. It is possible to suppress leakage into the water.

In this embodiment, three elastic elements 268, 269, 270 are mounted in the free edge 266, but each elastic element 268, 269, 270, when the diaper 210 is worn, As long as it has the elongation stress which is spaced apart from the extension part 258a of the 1st sheet member 258 and press-contacts to a wearer's groin part, at least 1 should just be arrange | positioned. Further, instead of these elastic elements 268, 269, 270, a single sheet having a required width capable of elastic contraction can be used for the second sheet member 264.

In the absorbent panel 250, an absorbent core 248 made of a mixture of fluff pulp, super absorbent polymer (SAP), and heat-weldable staple fibers as necessary is coated with a liquid diffusible sheet 249 such as tissue paper. Has been. Thus, since the whole absorptive core 248 is encapsulated with the liquid diffusable sheet 249, it is possible to prevent the shape loss and the SAP drop-off. The absorbent core 248 is compressed to the shape of an hourglass so as to improve shape retention and liquid absorption diffusivity, and has higher rigidity than the sheet member constituting the diaper 210, and is called semi-rigid. Sometimes.

8 is a schematic cross-sectional view taken along the line VIII-VIII of FIG. 5 when the diaper 210 is worn, and FIG. 14 is a schematic cross-sectional view of the conventional disposable diaper 110 corresponding to FIG.

As shown in FIG. 8, a second waist elastic element 231 that crosses the front end flap 262 of the absorbent chassis 212 in the lateral direction Y is disposed in the second stretchable region 226 of the front waist region 213. Thus, since the 2nd waist elastic element 231 has crossed the front end flap 262 of the absorptive chassis 212, it can prevent that a level | step difference arises in a part of front waist panel 216. FIG.

That is, as shown to Fig.14 (a), in the disposable diaper 110 of a prior art, the space S is formed between the front end flap 162 of the absorptive chassis 112, and the wearer's body A. As shown in FIG. This is because the absorbent core 144 usually includes fluff pulp or the like for improving its liquid absorbency and diffusibility, has a given thickness compared to the front end flap 162 made of only a sheet member, and has a waist elasticity This is because the waist opening edge portion 116a and the absorbent core 144 that are in close contact with the wearer's body A are disposed away from the absorbent core 144. In particular, when the absorbent core 144 absorbs a large amount of urine, the thickness of the absorbent core 144 increases and the gap S becomes larger.

In such a state, when the wearer bends forward, the wearer's body A pushes the waist opening edge 116a and the vicinity thereof forward of the wearer, so the front end flap 162 and the elastic waist facing it The part of the member 111 is bent toward the space S, and as shown in FIG. 14B, the front end flap 162 and the part of the elastic waist member 111 opposed thereto are the wearer's body A and the absorbent core 144. And a step R is generated.

Due to the step R, not only the diaper 110 is displaced from the desired position, but also the urine that the absorbent core 144 could not absorb could be accumulated in the step R and leaked to the outside. Is also not preferred.

In particular, as in the present embodiment, when the annular elastic waist panel 211 and the absorbent chassis 212 including the absorbent core 248 are formed separately, the absorbent chassis 212 becomes the elastic waist panel 211. Since it is in a suspended state, the absorbent chassis 212 may move inside the elastic waist panel 211 due to the movement of the wearer, and the absorbent core 248 is directly interposed inside the elastic waist panel 211. Compared to the diaper 210, such a step is likely to occur.

In the present invention, as shown in FIG. 8, the second waist elastic element 231 is disposed so as to cross the front end flap 262 of the absorbent chassis 212, that is, in the second stretchable region 226, so the front end flap 262 is worn. Close to the body A of the wearer, no space S is formed between the front end flap 262 and the wearer's body A, and the second stretchable region 226 is between the absorbent core 248 and the wearer's body A. There is no slipping down.

Moreover, in such an embodiment, when the extension stress of the second stretchable region 226 is smaller than the stretch stress of the first stretchable region 225, when the wearer bends forward, the second stretchable region 226 bends, The second stretchable area 226 and the front end flap 262 may be folded, and a step may be formed in a part of the front waist area 213. Therefore, whether the extension stress of the second stretchable region 226 is equal to that of the first stretchable region 225 so that the adhesion to the wearer's body is not hindered by the influence of the extension of the first stretchable region 225. Or more than that is preferable. On the other hand, the first stretchable region 225 requires a desired stretch stress in order to fix the front and rear waist regions 213 and 214 of the diaper 210 at a required position around the wearer's torso, so that the stretch stress is the third stretchable region. Preferably it is greater than that of 227. Therefore, it is preferable that the correlation between the extension stresses in the stretchable regions 225, 226, and 227 is as follows: second stretchable region 226 ≧ first stretchable region 225> third stretchable region 227.

Specifically, the extension stress at 65% at the maximum extension of the first stretch region 225 is 38 to 42 mN / mm, the extension stress at 65% at the maximum extension of the second stretch region 226 is 42 to 48 mN / mm, It is preferable that the extension stress at 65% of the maximum extension of the three stretchable region 227 is 28 to 32 mN / mm. When the extension stress at 65% at the maximum extension of the second stretchable region 226 is 42 mN / mm or less, the front end flap 262 cannot be brought into close contact with the wearer's body A, and the above effect cannot be exhibited. Because.

In addition, the elongation stress of each stretch region 225, 226, 227 is measured by the following method.

First, the seam portion 222 of the diaper 210 is peeled off so as to be in an unfolded state as shown in FIG. 5, and the waist elastic elements 230, 231, 232 are expanded. The length is the length at maximum extension. Next, the entire front waist panel 216 is cut out from the diaper 210, and the stretchable regions 225, 226, and 227 are cut out from the cut out front waist panel 216 as samples, and the region width of each sample (the dimension in the longitudinal direction Y of the diaper 210). ). When cutting each of the stretchable regions 225, 226, and 227, it is cut at the center in the longitudinal direction X of the region located between the adjacent waist elastic elements 230, 231, and 232. The sample is fixed in a contracted state between chucks of a tensile tester (manufactured by Shimadzu Corporation) (the initial distance between chucks is set to 100 mm and appropriately adjusted according to the sample), and the sample is subjected to a tensile speed of 100 mm / min. The diaper 210 is stretched in the same direction as the lateral direction Y, and the load (mN) at a length of 65% at the maximum extension is measured, and each stretchable region 225 is calculated by the formula of measured value (mN) ÷ region width (mm). , 226, 227 were calculated.

Further, it is preferable that the expansion ratio of the second expansion / contraction region 226 is equal to or higher than the expansion magnification of the first expansion / contraction region 225. When the expansion ratio of the second expansion / contraction area 226 is smaller than the expansion ratio of the first expansion / contraction area 225, when the wearer bends forward and the first expansion / contraction area 225 is further expanded, the expansion is affected. This is because there is a possibility that the second stretchable area 226 is separated from the wearer's body A and a space S is formed.

The first to third waist elastic elements 230, 231, and 232 are made of natural or synthetic rubber, and can be in the form of strands or tapes having rubber elasticity.

Specifically, when the waist elastic elements 230, 231 and 232 are made of strand-like rubber elastic elements, the first and second waist elastic elements 230 and 231 have a cross-sectional area of 550 to 650 dtex and an expansion ratio. As the third waist elastic element 232, those having a cross-sectional area of 450 to 500 dtex and an expansion ratio of 300 to 350% can be used, respectively.

However, as long as each stretchable region 225, 226, 227 has a desired elongation stress, the first waist elastic element 230 and the second waist elastic element 231 are composed of elastic elements having different cross-sectional areas and expansion ratios. Alternatively, the waist elastic elements 230, 231, 232 may all be made of the same member. In the illustrated example, in the front waist region 213, there are four first waist elastic elements 230, five second waist elastic elements 231 and seven third waist elastic elements 232. In accordance with the elongation stress required by 226, 227, the number thereof and the separation distance (pitch) between the waist elastic elements 230, 231, 232 arranged in parallel can be appropriately changed. For example, when the second stretchable region 226 requires a larger extension stress than the first stretchable region 225, when the first and second waist elastic elements 230, 231 are made of the same member, as shown in the figure, Naturally, the pitch between the second waist elastic elements 231 is set smaller than the pitch between the one waist elastic elements 230.

In order to give a desired elongation stress to each of the stretchable regions 225, 226, and 227, instead of disposing each of the waist elastic elements 230, 231, and 232 as in the present embodiment, an elastic stretchable sheet is formed in an annular shape. You may adhere to the inner surface of the elastic waist panel 211, and the sheet | seat member which comprises the cyclic | annular elastic waist panel 211 may have elastic elasticity.

Referring to FIG. 7 again, a fourth stretchable region 234 is formed inside the third stretchable region 227 of the rear waist panel 217. A fourth waist elastic element 235 made of the same elastic element as the third waist elastic element 232 arranged in the third elastic region 227 is arranged in the fourth elastic region 234. As shown in the drawing, the number of the fourth waist elastic elements 235 is smaller than that of the other waist elastic elements 230, 231, and 232, and the extension stress of the fourth stretchable region 234 in the transverse direction Y is in the transverse direction Y. It is set lower than that of the other stretchable areas 225, 226, 227.

Such a fourth stretchable region 234 covers the required range of the wearer's buttocks and can form a soft contact surface along the curved surface of the buttocks.

As the constituent members forming the front and rear waist panels 216 and 217 and the absorbent chassis 212, various materials commonly used in this type of disposable diaper can be used without limitation. In this embodiment, the elastic waist panel 211 is composed only of the front and rear waist panels 216 and 217, but is positioned between the front and rear waist panels 216 and 217 and the front and rear waist panels 216 and 217, and the crotch region 215. The front and rear waist panels 216 and 217 and the crotch member may be formed of a continuous sheet. Furthermore, in addition to the pants-type disposable diaper in which both side edges 219, 220 of the front and rear waist regions are connected in advance, the present invention can also be applied to an open-type disposable diaper in which both side edges 219, 220 of the front and rear waist regions are not connected in advance.

An example of the disposable diaper of the third invention will be described.

FIG. 9 is a perspective view showing a wearing state of the diaper 310. 10 is a developed plan view when the diaper 310 is peeled back and forth at the seam portion 321 and extended in the vertical direction X and the horizontal direction Y, and FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG. 12 is a view showing a state where the absorbent chassis 312 of FIG. 10 is removed (excluding the absorbent panel 346). In FIG. 12, for convenience of explanation, the absorbent panel 346 is indicated by a virtual line.

As shown in FIG. 9, the diaper 310 includes an annular elastic waist panel 311, a chassis 312 attached to the skin contact surface side of the elastic waist panel 311, a front waist region 313, a rear waist region 314, and front and rear waists. It includes a crotch region 315 located between the regions 313 and 314, a waist opening 316 and a pair of leg openings 317. The waist opening 316 is defined by an annular elastic waist panel 311.

As shown in FIGS. 10 and 12, the elastic waist panel 311 includes a front waist panel 318 that forms the front waist region 313, and a rear waist panel 319 that forms part of the rear waist region 314 and the crotch region 315. ing. The front waist panel 318 is defined in a horizontal rectangular shape by an inner edge 318a, an outer edge 318b, and both side edges 318c connecting the inner edge 318a and the outer edge 318b. The outer inner edge 319a, the outer edge 319b, both side edges 319c extending inwardly from the outer edge 319b, and both the inner edges 319d connecting the outer edge 319b and the inner edge 319a are substantially The shape is defined. Both side edges 318c of the front waist panel 318 and both side edges 319c of the rear waist panel are overlapped with each other, and various kinds of known means such as hot embossing and sonic are used in the seam portion 321 arranged intermittently in the vertical direction X. Are joined together by the heat welding means, and a pair of leg openings 317 are defined in cooperation with the elastic waist panel 311 (see FIG. 9).

The front and rear waist panels 318 and 319 are formed of a laminate of an inner layer sheet 322 located on the inner surface and an outer layer sheet 323 located on the outer surface. The outer layer sheet 323 has extending portions 324 extending from the front and rear end edges 322a and 322b of the inner layer sheet 322 in the longitudinal direction X, respectively, and the extending portion 324 is a skin contact of the front and rear waist panels 318 and 319. After the absorbent chassis 312 is disposed on the surface side, the absorbent chassis 312 is folded toward the inside of the diaper 310, and both side portions thereof are fixed to both side portions (both side portions of the front and rear waist panels) 318f and 319f of the front and rear waist region. Thus, since the extending part 324 of the outer layer sheet 323 covers the front and rear end edges 322a and 322b of the inner layer sheet 322, it is possible to prevent the excrement from leaking out from the front and rear end edges 322a and 322b. Can do.

For the inner layer sheet 322 and the outer layer sheet 323, a hydrophobic fiber nonwoven fabric, a moisture permeable plastic film, and a laminate sheet thereof are preferably used.

Further, first to seventh waist elastic elements 326, 327, 328, 329, 330, 331, 332 are interposed between the outer layer sheet 323 and the inner layer sheet 322 of the front and rear waist panels 318, 319, and at least The inner layer sheet 322 is attached to the inner surface. As will be described later, the waist elastic elements 326, 327, 328, 329, 330, 331, and 332 cause the front waist region 313 to include the first to third stretch regions 333, 334, and 335, and the rear waist region 314, Fourth to seventh expansion / contraction areas 336, 337, 338, 339 are formed. A plurality of ridges 325 are formed on the surface of the diaper 310 by contraction of the waist elastic elements 326, 327, 328, 329, 330, 331, and 332 (see FIG. 9).

As shown in FIGS. 10 and 11, the absorbent chassis 312 includes a liquid absorbing structure 341. The liquid-absorbing structure 341 includes a liquid-permeable body side liner (top sheet) 342, a liquid-impermeable back sheet 343, an absorbent core 344 having a sufficient absorption capacity for body fluid, and an absorbent core 344. An absorbent panel 346 having a liquid diffusive sheet 345 to be wrapped.

In the liquid absorbent structure 341, a back sheet 343 extending outward in the vertical direction X from the front and rear end edges 346a and 346b of the absorbent panel 346 and a body side liner 342 extending further outward in the vertical direction X than the back sheet 343 are hot. An end flap extending in the lateral direction Y formed by being joined via a melt adhesive (not shown), and a body side liner 342 extending outward in the lateral direction Y from a pair of side edges 346c of the absorbent panel 346; A pair of inner side flaps 352 formed by joining the back sheet 343 via a hot melt adhesive (not shown) and extending in the longitudinal direction X, and in the longitudinal direction on both sides of the liquid-absorbent structure 341 A pair of barrier leg cuffs 353 extending to X.

The absorbent chassis 312 further includes a first sheet member 358 fixed to the lower surface of the liquid absorbent structure 341 via a hot melt adhesive application region 356, and the liquid absorbent structure of the first sheet member 358. A pair of sleeve-shaped outer sides formed by folding portions 358a extending outward in the lateral direction Y of 341 to the inside and joining the overlapping portions via a hot melt adhesive 360. Includes a flap 361. Each outer side flap 361 covers the outer edge of each inner side flap 352. Since the outer edge of each inner side flap 352 is covered with each outer side flap 361, the outer edge of each inner side flap 352, which is usually the cutting edge of the sheet, comes into contact with the wearer's skin. Without irritation, it is possible to prevent itching and rash.

Since the first sheet member 358 is fixed to the lower surface of the liquid-absorbing structure 341 in this manner, the absorbent chassis 312 has a portion extending from the back sheet 343 of the body side liner 342 to the outside in the longitudinal direction X and the first portion. It has front and rear end flaps 362 and 363 formed by front and rear end edges of one sheet member 358.

A strand-like elastic element 367 extending in the longitudinal direction X so as to be shrinkable is attached to the inside of the sleeve of each outer side flap 361 via a hot melt adhesive (not shown). As a result, when the diaper 310 is worn, the outer side flap 361 is bent inward in the lateral direction Y by the contraction of the elastic element 367 and is elastically pressed against the wearer's thigh. In this embodiment, the number of elastic elements 367 is one, but a plurality of strips may be arranged as necessary.

Each barrier leg cuff 353 is formed of an extended portion 358a of the first sheet member and a second sheet member 364 folded in two, and the overlapping edge portion of the second sheet member 364 is hot. It has a fixing part 365 fixed to the extension part 358a via a melt adhesive (not shown), and a sleeve-like free edge part 366 formed from a bent part of the second sheet member 364. The free edge portion 366 opposes the extended portion 358a of the first sheet member in the unfolded state of the diaper 310, and three elastic elements 368, 369, 370 extending in the longitudinal direction X are hot-melted on the inner surface thereof. It is attached via an adhesive (not shown). When the diaper 310 is worn, the elastic elements 368, 369, and 370 extend, the free edge portion 366 is separated from the extension portion 358a, and the excrement is prevented from leaking out from both sides of the absorbent chassis 312. can do.

In this embodiment, three elastic elements 368, 369, 370 are mounted in the free edge 366, but each elastic element 368, 369, 370 has the free edge 366 when the diaper 310 is worn. As long as it has the extensional stress spaced apart from the extension part 358a of a 1st sheet member and press-contacts to a wearer's groin part, at least 1 should just be arrange | positioned. Further, instead of the elastic elements 368, 369, and 370, a single sheet having a required width that can be elastically contracted can be used for the second sheet member 364.

In the absorbent panel 346, an absorbent core 344 made of a mixture of fluff pulp, super absorbent polymer (SAP), and heat-weldable staple fibers as necessary is coated with a liquid diffusion sheet 345 such as tissue paper. ing. Thus, since the whole absorptive core 344 is encapsulated with the liquid diffusable sheet 345, it is possible to prevent the deformation of the shape and the drop-off of the SAP. The absorbent core 344 is compressed into the shape of an hourglass so as to improve shape retention and liquid absorption diffusivity, and has higher rigidity than the sheet member constituting the diaper 310, and is semi-rigid. Sometimes called.

Referring again to FIGS. 9 and 12, the front waist panel 318 includes a first stretch region 333 extending in the lateral direction Y between the side edges 318c from the outer end edge 318b to the front end 347 of the absorbent panel 346. A pair of second stretchable areas 334 adjacent to the first stretchable area 333 and spaced apart in the lateral direction Y; a pair of third stretchable areas 335 adjacent to the second stretchable area 334 and spaced apart and opposed in the lateral direction Y; The front waist region 313 is located at the center in the lateral direction Y, and is divided into first non-stretchable regions 340A that separate the second stretchable regions 334 and the third stretchable regions 335 from each other.

A plurality of first waist elastic elements 326 extending in the lateral direction Y between both side edges 318c of the front waist panel 318 are disposed in the first stretchable area 333, and the second stretchable area 334 includes a side edge 318c extending from the side edge 318c. The 2nd waist elastic element 327 extended to the side part of the front-end part 347 of the absorptive panel 346 is arrange | positioned, and the 3rd expansion-contraction area 335 is the absorptive panel from the side edge 318c similarly to the 2nd waist elastic element 327. A third waist elastic element 328 extending to the side of the front end 347 of 346 is disposed.

The first non-stretchable region 340A is located in the central portion in the lateral direction Y of the front waist panel 318. When the formation method is described, for example, as a method generally used in this type of disposable diaper, There is a method of cutting back the second and third waist elastic elements 327 and 328. That is, a hot melt adhesive is appropriately applied to the second and third stretchable areas 334 and 335 in a pattern, and is not applied to the first non-stretchable area 340A, and the second and second stretches extending to the respective areas 334, 335, and 340A. The three-waist elastic elements 327 and 328 are supplied under extension and fixed to the adhesive application region, and in this state, the second and third waist elastic elements 327 and 328 located in the first non-stretchable region 340A are cut. Then, these elastic elements 327 and 328 are automatically contracted and returned to the fixed region (cutback). Thereby, the extended second and third waist elastic elements 327 and 328 are substantially absent in the first non-stretchable region 340A. Alternatively, the second and third waist elastic elements 327 and 328 extending in series may be supplied to each of the regions 334, 335, and 340A, and the region located in the first non-stretchable region 340A may be removed. it can.

Furthermore, the first non-stretchable region 340A is formed by fixing the second and third waist elastic elements 327 and 328 in an unstretched state as they are with a hot-melt adhesive and losing or suppressing their contractility. You can also

Therefore, the term “non-stretchable region” as used herein refers to a case where the elastic element is cut or removed and substantially no elastic element is present, and a case where the elastic element is not contractible.

Thus, by forming the first non-stretchable region 340A, it is possible to attach a plastic sheet on which the graphic is printed on the inner surface of the first non-stretchable region 340A to make the graphic visible, Since the contraction force of the elastic element does not directly act on the central portion of the absorbent panel 346, the central portion of the absorbent panel 346 is not deliberately deformed, such as wrinkles, and there is no fear that the absorbent performance of the absorbent core will deteriorate.

As shown in the figure, the first to third waist elastic elements 326, 327, and 328 have the same pitch in the vertical direction X. Further, the extension stress of the second extension region 334 is greater than the extension stress of the third extension region 335 and is equal to or greater than the extension stress of the first extension region 333. The expansion ratio is larger than that of the first expansion / contraction area 333 and is set to be equal to or higher than the expansion ratio of the third expansion / contraction area 335. Therefore, the expression of the correlation between the elongation stresses of the first to third stretch regions 333, 334, and 335 is second stretch region 334 ≧ first stretch region 333> third stretch region 335, and The expression of the correlation between the expansion ratios of the three expansion / contraction areas 333, 334, and 335 is the second expansion / contraction area 334 ≧ the third expansion / contraction area 335> the first expansion / contraction area 333.

More specifically, the extension stress at 65% of the first stretch region 333 at the maximum extension is 38 to 42 mN / mm, the extension stress at 65% of the second stretch region 334 at the maximum extension is 42 to 48 mN / mm, It is preferable that the extension stress at 65% of the maximum extension / contraction region 335 is 28 to 32 mN / mm.

In addition, the elongation stress of each expansion / contraction area | region 333,334,335 is measured with the following method.

First, the seam portion 321 of the diaper 310 is peeled off so as to be in an unfolded state as shown in FIG. 10, and the waist elastic elements 326, 327, and 328 are stretched. The length is the length at maximum extension. Next, the entire front waist panel 318 is cut out from the diaper 310, and the stretchable regions 333, 334, and 335 are cut out from the cut out front waist panel 318 as samples, and the region width of each sample (the dimension in the longitudinal direction Y of the diaper 310). ). When cutting each of the stretchable regions 333, 334, and 335, cutting is performed at the center in the longitudinal direction X of the region located between the adjacent waist elastic elements 326, 327, and 328. The sample is fixed in a contracted state between chucks of a tensile tester (manufactured by Shimadzu Corporation) (the initial distance between chucks is set to 100 mm and appropriately adjusted according to the sample), and the sample is subjected to a tensile speed of 100 mm / min. The diaper 310 is stretched in the same direction as the lateral direction Y, and a load (mN) at a length of 65% at the maximum elongation is measured, and each stretchable region 333 is calculated by the formula of measured value (mN) ÷ region width (mm). , 334, 335 were calculated.

Thus, in order to set the elongation stress and the expansion / contraction magnification of each expansion / contraction region 333, 334, 335, the second waist elastic element 327 has a cross-sectional area larger than that of the third waist elastic element 328, Same as or more than that of the first waist elastic element 326 and having an expansion ratio equivalent to that of the third waist elastic element 328 and larger than that of the first waist elastic element 326 Can be used.

Specifically, as the waist elastic elements 326, 327, and 328, the first waist elastic element 326 has a cross-sectional area of 550 to 650 dtex and an expansion ratio of 2.5 to 3.0 times, respectively. 327 has a cross-sectional area of 550 to 650 dtex and an extension ratio of 3.0 to 3.5 times, and the third waist elastic element 328 has a cross-sectional area of 450 to 500 dtex and an extension ratio of 3.0 to 3.5 times. Shaped elastic elements can be used.

Also, the first to third waist elastic elements 326, 327, and 328 can be configured from the same elastic element, and the number and pitch thereof can be adjusted so as to have a correlation with the elongation stress. For example, when the 1st waist elastic element 326 and the 2nd waist elastic element 327 are comprised from the same elastic element, the pitch of the 2nd waist elastic element 327 is made smaller than the pitch of the 1st waist elastic element 326. Thus, the extension stress of the second extension region 334 can be made larger than the extension stress of the first extension region 333.

As described above, the first stretchable region 333 extends in the lateral direction Y from the front end 347 of the absorbent panel 346, and the second stretchable region 334 that extends on both sides of the front end 347 of the absorbent panel 346 has other stretchable properties. Since it has a larger elongation stress than the areas 333 and 335, the front end portion 347 of the absorbent panel 346 is in close contact with the wearer's body, and does not deviate from a desired position. Further, since the expansion ratio of the second expansion / contraction area 334 is larger than the expansion ratio of the first expansion / contraction area 333, the second expansion / contraction area 334 is not affected by the expansion / contraction of the first expansion / contraction area 333.

On the other hand, in the rear waist panel 319, a fourth stretchable area 336 extending between the side edges 319c along the outer edge 319b, and a fifth stretchable extension adjacent to the fourth stretchable area 336 and extending to the rear edge 346b of the absorbent panel 346. A pair of sixth stretchable areas 338 adjacent to the area 337 and the fifth stretchable area 337 and facing each other in the lateral direction Y, and adjacent to the sixth stretchable area 338, extending to the inner edge 319a and separated in the lateral direction Y And a pair of seventh expansion / contraction regions 339 facing each other. A second non-stretchable region 340B is formed between each sixth stretchable region 338 and each seventh stretchable region 339.

In the fourth and fifth stretch regions 336 and 337, strand-like fourth and fifth waist elastic elements 329 and 330 extending between the side edges 319c in the lateral direction Y are disposed. A sixth waist elastic element 331 extending from the side edge 319c to the side of the front end 347 of the absorbent panel 346 is disposed, and each seventh stretchable region 339 is disposed on the side of the absorbent panel 346 from the side edge 319c. A strand-like seventh waist elastic element 332 extending to the vicinity of the edge 346c is disposed.

The formation method of the second non-stretchable region 340B is the same as that of the first non-stretchable region 340A, and the elastic element is cut or removed so that the elastic element is not substantially present, or the elastic element exhibits contractility. It can be formed by not making it.

In the rear waist panel 319, the extension stress of the sixth extension region 338 is equal to or greater than the extension stress of the fourth extension region 336, and the extension stress of the fourth extension region 336 is the fifth extension region 337. The extension stress of the fifth extension region 337 is set to be greater than the extension stress of the seventh extension region 339. Further, the expansion ratio of the fifth expansion / contraction area 337 and the sixth expansion / contraction area 338 is equal, and the expansion ratio of the expansion / contraction areas 337 and 338 is larger than the expansion ratio of the fourth expansion / contraction area 336, and The expansion ratio is larger than the expansion ratio of the seventh expansion / contraction area 339. Therefore, when the correlation of the extension stress of the fourth to seventh expansion regions 336, 337, 338, 339 is expressed by an equation, the sixth expansion region 338 ≧ the fourth expansion region 336> the fifth expansion region 337> the seventh expansion region. When the correlation of the expansion magnification is expressed by an equation, the fifth expansion region 337 = the sixth expansion region 338> the fourth expansion region 336> the seventh expansion region 339.

Specifically, the extension stress at 65% at the maximum extension of the fourth stretch region 336 is 38 to 42 mN / mm, the extension stress at 65% at the maximum extension of the fifth stretch region 337 is 8 to 20 mN / mm, It is preferable that the elongation stress at 65% of the sixth stretchable region 338 at the maximum extension is 42 to 48 mN / mm, and the stretch stress at 65% of the seventh stretchable region 339 at the maximum extension is 1 to 4 mN / mm.

In addition, the elongation stress of each expansion / contraction area | region 336,337,338,339 can be measured by the method similar to the measuring method in the said 1st thru | or 3 expansion-contraction area | region 333,334,335. However, since the inner edge 319d of the seventh stretchable region 339 extends obliquely inward of the diaper 310, both ends thereof cannot be fixed to the chuck of the tensile tester. Therefore, a portion located between the two seventh waist elastic elements 332 and a portion located between the seventh waist elastic element 332 and the inner edge 319a are cut out from the seventh stretchable region 339 cut out from the product. Each sample was stretched in the same direction as the transverse direction Y of the diaper 310 using a tensile tester, and the stress value at 65% length at the maximum elongation was measured, and the total of those stress values Was defined as the elongation stress of the seventh stretchable region 339.

Thus, in order to set the extension stress and extension magnification of the fourth to seventh stretch regions 336, 337, 338, 339, the respective waist elastic elements 329, 330, 331, 332 are respectively fourth waist elastic elements. 329 has a cross-sectional area of 550 to 650 dtex and an expansion ratio of 2.5 to 3.0 times, and the fifth waist elastic element 330 has a cross-sectional area of 500 to 550 dtex and an expansion ratio of 3.0 to 3.5 times. The 6-waist elastic element 331 has a cross-sectional area of 550 to 650 dtex and an expansion ratio of 3.0 to 3.5 times, and the seventh waist elastic element 332 has a cross-sectional area of 500 to 550 dtex and an expansion ratio of 1.8 to 2. A quadruple strand-like elastic element can be used.

In the present embodiment, as illustrated, the pitch of the sixth waist elastic element 331 is larger than the pitch of the fourth waist elastic element 329, and the pitch of the fifth waist elastic element 330 is the pitch of the sixth waist elastic element 331. The pitch of the seventh waist elastic elements 332 is larger than the pitch of the fifth waist elastic elements 330. In this way, the pitch size may be adjusted in order to set the elongation stress of each of the stretchable regions 336, 337, 338, and 339 so as to have the correlation. Further, the fourth to seventh waist elastic elements 329, 330, 331, and 332 can be formed of the same elastic element by adjusting the size of the pitch. Furthermore, as long as each expansion / contraction area | region 336,337,338,339 has the said correlation, the expansion ratio of the 5th waist elastic element 330 located in the 6th expansion / contraction area 338 side is the expansion ratio of the 6th waist elastic element 331. The expansion ratio of the sixth waist elastic element 331 may be equal to the expansion ratio of the seventh waist elastic element 332.

As described above, since the sixth stretchable region 338 extending on both sides of the rear end portion 348 of the absorbent panel 346 has a larger extension stress than the other stretchable regions 336, 337, 339, the rear end portion of the absorbent panel 346 348 is closely attached to the wearer's body and does not deviate from the desired position. Further, since the expansion ratio of the sixth expansion / contraction area 338 is larger than the expansion ratio of the fourth expansion / contraction area 336, the sixth expansion / contraction area 338 is not affected by the expansion / contraction of the fourth expansion / contraction area 336.

Furthermore, as shown in the drawing, the seventh waist elastic element 332 is less in number than the other waist elastic elements 329, 330, 331, and the extension stress of the seventh elastic region 339 is the other elastic regions 336, 337, Since it is lower than that of 338, the required range of the wearer's buttocks can be covered, and a frill-like soft contact surface can be formed along the curved surface of the buttocks.

13 is a schematic cross-sectional view taken along the line XIII-XIII of FIG. 10 when the diaper 310 is worn, and FIGS. 14A and 14B are schematic cross-sectional views corresponding to FIG. 13 of the disposable diaper 110 of the prior art. is there.

As shown in FIG. 13, the first waist elastic element 326 forming the first stretchable region 333 of the front waist region 313 crosses the front end flap 362 of the absorbent chassis 312 and the front end portion 347 of the absorbent panel 346. As described above, the first stretchable region 333 crosses the front end flap 362 of the absorbent chassis 312 and the front end portion 347 of the absorbent panel 346, thereby preventing a step from occurring in a part of the front waist region 313. be able to.

That is, as shown in FIG. 14A, in the conventional disposable diaper 110, a space S is formed between the front end flap 162 of the absorbent chassis 112 and the wearer's body A. This is because the absorbent core 144 usually includes fluff pulp or the like for improving its liquid absorbency and diffusibility, has a given thickness compared to the front end flap 162 made of only a sheet member, and has a waist elasticity This is because the waist opening edge portion 116a that is in close contact with the wearer's body A by disposing the element 126 and the liquid-absorbing chassis 112 are separated from each other. In particular, when the absorbent core 144 absorbs a large amount of urine, the thickness of the absorbent core 144 increases and the gap S becomes larger.

In such a state, when the wearer bends forward, the wearer's body A pushes the waist opening edge 116a and its vicinity forward of the wearer, so the front end flap 162 and the waist member facing it. The portion 111 is bent toward the space S, and as shown in FIG. 14B, the front end flap 162 and the portion of the front waist member 111 facing the front end flap 162 are formed between the wearer's body A and the absorbent core 144. A gap R is generated in the meantime, resulting in a step R.

Moreover, even if the waist elastic element 126 is disposed on the front end flap 162, the absorbent core 144 increases its thickness by absorbing a large amount of urine as described above. The front end portion 147 and the portion of the waist member 111 facing the front end portion 147 are shifted up on the front end flap 162 that is in close contact with the wearer's body A, and the front end flap 162 and the portion of the waist member 111 facing the front end flap 162 are shifted to the space S. Like the fallen state, that is, the state shown in FIG.

Due to the step R, not only the diaper 110 is displaced from the desired position, but also the urine that the absorbent core 144 could not absorb could be accumulated in the step R and leaked to the outside. Is also not preferred.

In particular, when the annular elastic waist panel 311 and the absorbent chassis 312 including the absorbent core 344 are formed separately as in the present embodiment, the absorbent chassis 312 is formed on the elastic waist panel 311. Since it is in a suspended state, the absorbent chassis 312 may move inside the elastic waist panel 311 due to the movement of the wearer, and the absorbent core 344 is directly interposed inside the elastic waist panel 311. Compared with the diaper 310, such a level difference R is likely to occur.

In the present embodiment, since the first waist elastic element 326 is disposed across the front end portion 347 of the absorbent chassis 312, the front end flap 362 and the portion of the front waist panel 318 facing the front end flap 362 are shifted to the space S. And the first waist elastic element 326 further crosses the front end portion 347 of the absorbent panel 346, so that the front end portion 347 of the absorbent panel 346 is brought into close contact with the wearer's body A by the extension stress. The upward movement is suppressed, and the step R does not occur in a part of the front waist region 313.

Further, as described above, since the second stretchable areas 334 having a larger elongation stress than the first and third stretchable areas 333 and 335 extend on both sides of the front end part 347 of the absorbent panel 346, the front end part Both sides of 347 can be brought into close contact with the wearer's body A, and the first stretchable region 333 and the second stretchable region 334 cooperate to suppress the upward movement of the front end 347 of the absorbent panel 346. Can do.

As described above, in order to bring the front end 347 of the absorbent panel 346 into close contact with the wearer's body A by the first stretchable region 333 and the second stretchable region 334, the rigidity of the absorbent core 344 is determined by the Taber method. The measurement is preferably 0.03 to 0.15 N · cm. When the rigidity of the absorbent core 344 is 0.15 N · cm or more, even if the extension stress of the first and second stretchable regions 333 and 334 is applied to the front end portion 347 of the absorbent panel 346, the portion is worn. This is because there is a possibility that the body A cannot be brought into close contact with the person.

In addition, in order to give a desired elongation stress to each of the stretchable regions 333, 334, 335, 336, 337, 338, 339, instead of arranging a strand-like elastic element as in the present embodiment, the elastic stretch The elastic sheet may be fixed to the inner surface of the annular elastic waist panel 311, or the sheet member itself constituting the annular elastic waist panel 311 may have elastic elasticity.

As the constituent members forming the front and rear waist panels 318 and 319 and the absorbent chassis 312, various materials commonly used in this type of disposable diaper can be used without limitation. Moreover, in this embodiment, although the cyclic | annular elastic waist panel 311 is comprised only from the front-and- back waist panels 318 and 319, it is located between the front-and- back waist panels 318 and 319 and the front-and- back waist panels 318 and 319, and is crotch. The crotch member which forms the area | region 315 may be included, and the front and rear waist panels 318 and 319 and the crotch member may be formed of a continuous sheet. Further, in addition to the pants-type disposable diaper in which both side edges 318c and 319c of the front and rear waist regions 313 and 314 are connected in advance, the open type disposable in which both side edges 318c and 319c of the front and rear waist regions 313 and 314 are not connected in advance. It can also be applied to diapers.

Claims (3)

1. A longitudinal direction and a lateral direction, a body-side inner surface and a clothing-side outer surface, a front waist region, a rear waist region, and a crotch region located between the front and rear waist regions, and a waist that defines the front and rear waist regions A waist member including a belt member and a crotch member defining a part of the front and rear waist regions and the crotch region, the waist belt member extending in the lateral direction and facing the longitudinal direction; A plurality of waist elastic bodies extending in the lateral direction and spaced apart in the longitudinal direction are attached to the waist belt member in an extended state, and a portion of the waist belt member includes the end of the waist elastic body. In disposable diapers that form non-shrinkable regions where contractile force does not act,
   The non-shrink region is formed along at least one of the waist side edge and the crotch side edge,
   The waist belt member includes an inner surface sheet that forms a body side inner surface and an outer surface sheet that forms a clothing side outer surface, and the waist side edge and the crotch side edge where the non-shrink region is formed include: The said diaper characterized by forming the junction part which joins the said inner / outer surface sheet | seat.
2. A longitudinal direction and a lateral direction, a skin contact surface and a non-skin contact surface, a front waist region, a rear waist region, a crotch region located between the front and rear waist regions, a waist opening and a pair of leg openings; An annular elastic waist panel forming the front and rear waist regions;
   Absorbent connected to the front and rear portions of the waist panel, extending from the crotch region to the front and rear waist region, and having an absorbent core and front and rear end flaps extending from the front and rear end edges of the absorbent core in the longitudinal direction. In disposable diapers including a chassis,
   At least the front waist region of the front and rear waist regions has at least a stretchable region extending in the lateral direction,
   A first stretchable region extending in the lateral direction in the vicinity of the front end flap of the absorbent chassis from an edge of the waist opening, and a second stretchable adjacent to the first stretchable region and extending in the lateral direction. Adjacent to the second stretchable region, extending from the side edge of the front waist region to both side portions of the absorbent chassis, and on both sides of the non-stretchable region formed at the laterally central portion of the front waist region. It is formed from a pair of third stretchable areas that are spaced apart and face each other in the lateral direction,
   The diaper characterized in that the second stretchable region crosses the front end flap of the absorbent chassis.
3. A longitudinal direction and a lateral direction, a skin contact surface and a non-skin contact surface, a front waist region, a rear waist region, a crotch region located between the front and rear waist regions, a waist opening and a pair of leg openings; An annular elastic waist panel forming the front and rear waist regions;
   An absorbent panel connected to the front and rear portions of the elastic waist panel, extending from the crotch region to the front and rear waist region and having an absorbent core, and a front and rear end extending in the longitudinal direction from a front and rear end edge of the absorbent panel In a disposable diaper comprising an absorbent chassis having a flap,
   At least the front waist region of the front and rear waist regions has at least a stretchable region extending in the lateral direction,
   The stretchable region is adjacent to the first stretchable region, the first stretchable region extending in the lateral direction at the front end including the front end flap of the absorbent chassis from the edge of the waist opening, and the front waist region A pair of second stretches extending from the side edges to both sides of the front end portion of the absorbent panel and facing and spaced apart in the lateral direction on both sides of the first non-stretchable region formed in the laterally central portion of the front waist region And a pair of regions that extend from the side edge of the front waist region to both sides of the front end portion of the absorbent panel and that are spaced apart from each other in the lateral direction on both sides of the first non-stretchable region. Formed from the third stretchable region,
   The said diaper characterized by the said 1st expansion-contraction area crossing the front-end part of the said absorptive panel.

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