JP2007275322A - Throwaway diaper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a throwaway diaper which keeps the width of an absorbent body in the crotch portion greater than the width of an exterior in the crotch portion, the insertability of legs into leg openings high, and the fittedness of the crotch portion high. <P>SOLUTION: The throwaway diaper has an absorbent body 5 having a surface sheet 2, a rear sheet 3 and an absorber 4 interposed between the sheets 2 and 3, a sheath 10 joined to the non skin-contacting side of the absorber body 5 by a body joining portion 13. The throwaway diaper 1 has an abdomen side portion, a crotch portion and a back side portion in the longitudinal direction. The absorber 4 takes the form of a near hourglass with the longitudinal direction centers of both edges inwardly constricted. Both sides of the rear sheet 3 are folded back laterally inward and joined to the skin butting side of the surface sheet 2 at least in the vicinity of the longitudinal both ends, the inside edges 32 of the folded rear sheet 3 curve outward breadthways in the crotch portion, and side elastic members 61 are curvedly arranged along the inside edges 32 of the curved rear sheet 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention includes an absorbent main body having a top sheet, a back sheet, and an absorbent body interposed between the two sheets, and an exterior body joined to the non-skin contact surface side of the absorbent main body, and in the deployed state, the crotch portion The present invention relates to a disposable diaper in which the width of the absorbent main body is wider than the width of the exterior body in the crotch portion.

Conventionally, it has a top sheet, a back sheet, and an absorbent body having an absorbent body interposed between both sheets, and an exterior body joined to the non-skin contact surface side of the absorbent body, Disposable diapers in which the width of the absorbent main body is wider than the width of the exterior body in the crotch part are known (see, for example, Patent Documents 1 and 2). In the disposable diapers described in Patent Documents 1 and 2, side gathers are formed along both side portions of the absorbent main body.
According to the disposable diaper of such a form, the leak from a leg part can be prevented, and the width | variety of the leg opening part formed from the exterior body is narrowly formed rather than the width | variety of an absorptive main body. Therefore, it is easy to pass the leg through the leg opening.

JP-A-11-107007 Japanese Utility Model Publication No. 7-18714

  However, in the disposable diapers described in Patent Documents 1 and 2, there are actually problems that the leg insertability to the leg opening is lowered and the fit of the crotch portion is likely to be lowered. Specifically, when the shape of the absorbent body is rectangular in the absorbent main body, the absorbent main body becomes leg opening when the width of the absorbent main body is wider than the width of the leg opening formed from the exterior body. As a result, the effective opening area of the leg opening is reduced, and the leg insertability is reduced.

In addition, when the absorbent body has an approximately hourglass shape (a shape in which the longitudinal center part of both side edges is constricted toward the inner side in the width direction), the side gathers of the absorbent body absorb at the time of wearing. Standing from the side edge of the body, the crotch part of the absorbent main body is apparently narrowed, so the leg insertability is improved, but the standing height of the side gather is apparently the standing height of the original side gather Further, since the sheet width of the constricted portion of the absorbent main body is added, the sheet width becomes too high, the distance between the absorbent body and the body becomes too large, and the fit between the crotch portions is lowered.
In particular, when trying to increase the width of the absorbent main body for use together with the urine absorbing pad, problems such as deterioration of leg insertion and lowering of crotch fit become more serious.

  Accordingly, an object of the present invention is a disposable diaper in which the width of the absorbent main body in the crotch portion is wider than the width of the exterior body in the crotch portion in the unfolded state, and the leg insertion portion has high insertability, and It is to provide a disposable diaper with high fit.

  The present invention comprises an absorbent main body having a top sheet, a back sheet, and an absorbent body interposed between both sheets, and an exterior body joined to the non-skin contact surface side of the absorbent main body by a main body joint portion, A disposable diaper having a ventral part, a crotch part and a dorsal part in the direction, wherein the absorbent body has a substantially hourglass shape in which the longitudinal center part of both side edges thereof is constricted inward in the width direction. And both side portions of the back sheet are folded inward in the width direction and joined to the skin contact surface side of the top sheet at least in the vicinity of both ends in the longitudinal direction, and the inner edge of the folded back sheet Is a disposable diaper that is curved so as to protrude outward in the width direction at the crotch portion, and a side elastic member is curved along the inner edge of the curved back sheet ( (Hereinafter also referred to as “first invention”) It is obtained by achieving the above object by Rukoto.

  The present invention also includes an absorbent body having a top sheet, a back sheet, and an absorbent body interposed between both sheets, and an exterior body joined to the non-skin contact surface side of the absorbent body by a body joint portion. A disposable diaper having a ventral part, a crotch part and a dorsal part in the longitudinal direction, wherein the absorbent body has a substantially hourglass shape in which the longitudinal center part of both side edges thereof is constricted inward in the width direction. The both sides of the back sheet are folded back inward in the width direction, and are joined to the skin contact surface side of the top sheet at least in the vicinity of both ends in the longitudinal direction. The inner edge is formed with a large number of cuts in the crotch portion, and the folded back sheet is provided with a side elastic member at a position outward in the width direction from the cuts. With an adhesive It is obtained by achieving the above object by providing a disposable diaper (hereinafter referred to as "second invention") which is not.

  The present invention also includes an absorbent body having a top sheet, a back sheet, and an absorbent body interposed between both sheets, and an exterior body joined to the non-skin contact surface side of the absorbent body by a body joint portion. A disposable diaper having a ventral part, a crotch part and a dorsal part in the longitudinal direction, wherein the absorbent body has a substantially hourglass shape in which the longitudinal center part of both side edges thereof is constricted inward in the width direction. In the deployed state, the width of the absorbent main body in the crotch portion is wider than the width of the exterior body in the crotch portion, and the width of the exterior body in the crotch portion is the width of the absorbent body in the crotch portion. Wider than the width, the width of the absorbent body in the crotch portion is equal to or greater than the width of the main body joint portion in the crotch portion, side elastic members are disposed on both sides of the absorbent main body, The width direction elastic part in the absorptive main body in the part There are those which have achieved the above object by providing a disposable diaper (hereinafter referred to as "third invention") which is disposed.

  The disposable diaper of the present invention is a disposable diaper in which the width of the absorbent main body in the crotch portion is wider than the width of the exterior body in the crotch portion in the unfolded state, and the leg can be easily inserted into the leg opening. The fit of the part is also high.

Below, the disposable diaper of this invention is demonstrated, referring drawings based on the preferable embodiment. First, a first embodiment which is an embodiment of the first invention will be described with reference to FIGS.
The disposable diaper 1 of 1st Embodiment is what is called a pants-type disposable diaper, and as shown in FIGS. 1-5, the absorber 4 interposed between the surface sheet 2, the back surface sheet 3, and both the sheets 2 and 3 is provided. The absorbent body 5 and the exterior body 10 joined to the non-skin contact surface side of the absorbent body 5 by the body joint portion 13 are provided.

  The disposable diaper 1 according to the present embodiment has, in the longitudinal direction, an abdominal side A disposed on the abdomen side of the wearer at the time of wearing, a dorsal side B disposed on the dorsal side of the wearer at the time of wearing, and an abdominal side part A. And a crotch portion C located between the back portion B and the back portion B. The abdominal side A, the crotch C and the back side B are in the longitudinal direction (up and down in FIG. 2) of the disposable diaper 1 in the unfolded state (the state in which the elastic member of each part is stretched and expanded in a flat shape, as shown in FIG. 2). Direction), when the region where the leg opening is present is the crotch portion C, the portion on the abdomen side of the crotch portion C is the abdominal side portion A, and the portion on the back side of the crotch portion C is the back side portion B. Show.

  In this specification, the “skin contact surface side” is the side disposed on the wearer's skin side when worn, and the “non-skin contact surface side” is the opposite side of the skin contact surface side. is there. The “longitudinal direction” and the “width direction” are the longitudinal direction and the width direction of the disposable diaper in the deployed state, respectively, unless otherwise specified.

The absorptive main body 5 has a vertically long rectangular plan view shape, and the main body extends from the abdominal side A to the back side B so that the longitudinal direction thereof coincides with the longitudinal direction of the disposable diaper 1. The joint portion 13 is joined to the center portion in the width direction on the skin contact surface side of the exterior body 10.
The main body bonding portion 13 is formed from a known bonding means such as a hot melt adhesive. The width W4 [see FIG. 3B] of the main body joint portion 13 is preferably 30 to 160 mm, and more preferably 50 to 140 mm.

  The length of the absorbent main body 5 is preferably 400 to 1000 mm, more preferably 450 to 850 mm. The width W1 [see FIG. 2, FIG. 3 (b), FIG. 5] of the absorbent main body 5 is preferably 80 to 340 mm, more preferably 120 to 300 mm.

  The absorbent body 4 has a substantially hourglass shape in which the longitudinal center portions of both side edges are constricted inward in the width direction. The preferable ranges of the length and the maximum width of the absorbent body 4 (the width between both side edges of the unbundled region) are the same as the preferable ranges of the length and the width of the absorbent main body 5, respectively. The width of the absorbent body 4 in the crotch portion C (the width of the narrowest portion in the constricted region) W3 (see FIGS. 2, 3B, and 5) is preferably 40 to 170 mm, more preferably 60 to 150 mm. It is. The length L1 (see FIG. 5) of the constricted region in the absorber 4 is preferably 300 to 900 mm, and more preferably 400 to 800 mm.

  In the absorbent main body 5, the top sheet 2 covers almost the entire region of the absorbent body 4 on the skin contact surface side. The back sheet 3 covers almost the entire region of the absorbent body 4 on the non-skin contact surface side, and both side portions thereof are folded back inward in the width direction so that the skin of the top sheet 2 is at least near both ends in the longitudinal direction. It is joined to the contact surface side. In the present embodiment, both side portions of the back sheet 3 are folded twice toward the inner side in the width direction, and the skin contact surface of the top sheet 2 in substantially the entire area of the abdominal part A and the back part B. It is joined to the side.

Note that both side portions of the back sheet 3 that are folded back to the top sheet 2 side are also referred to as “folded areas 31”.
The width W5 of the folded region 31 (see FIG. 3A and FIG. 5) is preferably 10 to 50 mm, and more preferably 15 to 45 mm.

  The inner edge 32 of the folded back sheet 3 is curved so as to protrude outward in the width direction at the crotch portion C, and the side elastic member 61 is formed along the curved inner edge 32 of the curved sheet 3. It is arranged in a curved manner.

The curved width W6 (see FIG. 5) of the inner edge 32 of the curved back sheet 3 is preferably 5 to 45 mm, more preferably 10 to 40 mm.
A plurality of side elastic members 61 are arranged in parallel at predetermined intervals over the entire length of the absorbent main body 5 in the longitudinal direction.

Specifically, as shown in FIG. 3A, the side elastic member 61 is sandwiched between the back sheet 3 folded twice in the folded region 31 at the ventral side A and the back side B. One is disposed, and two are disposed between the absorber 4 and the back sheet 3.
Further, as shown in FIG. 3B, three side elastic members 61 are provided between the non-skin contact surface side of the top sheet 2 and the skin contact surface side of the back sheet 3 in the crotch portion C. It is arranged.

  The exterior body 10 has a substantially hourglass-shaped plan view shape in which both side edges of a region located in the crotch portion C are bound inward in the width direction. In the exterior body 10, both side edges of the region located on the ventral side A and both side edges of the region located on the back side B are joined together by known joining means such as heat sealing and ultrasonic sealing. As a result, a pair of side seal portions are formed. Moreover, the waist opening part 7 and a pair of leg opening parts 8 and 8 are formed in the disposable diaper 1 by this joining.

  The exterior body 10 includes two exterior body forming sheets 11 and 12 and elastic members of respective parts fixed between the two sheets 11 and 12. Between the two exterior body forming sheets 11 and 12, a waist elastic member 71 that forms a waist gather at the peripheral edge of the waist opening 7, and a leg part that forms a leg gather at the peripheral edge of the leg opening 8 The elastic member 81 and the waistline elastic member 91 forming a waistline gather in the waistline portion D (region from the position 20 mm downward from the peripheral edge of the waist opening 7 to the upper end of the leg opening 8) are in an extended state, respectively. Thus, it is bonded and fixed by a bonding means such as a hot melt adhesive.

  The leg elastic member 81 on the abdominal side A is along a substantially half region on the abdominal side A side in one leg opening 8, straddles the crotch C in the width direction, and the abdomen in the other leg opening 8. It is disposed along a substantially half region on the side A side. Similarly, the leg elastic member 81 on the back side B side extends along a substantially half region on the back side B side of one leg opening 8 and straddles the crotch C in the width direction, and the other leg opening 8 is arranged along a substantially half region on the back side B side. It is preferable that the leg elastic member 81 has a non-elastic structure or a configuration in which the leg elastic member 81 crosses the absorber 4 because the absorber 4 is not twisted or twisted.

  The exterior body forming sheets 11 and 12 are each composed of a breathable nonwoven fabric. Of these two sheets 11 and 12, the sheet 11 positioned on the non-skin contact surface side is the longitudinal edge of the sheet 12 positioned on the skin contact surface side in the longitudinal direction (both edges in the longitudinal direction). Each of the extending portions covers the front and rear ends (both ends in the longitudinal direction) of the absorbent main body 5 in a state where the absorbent main body 5 is disposed on the sheet 12, respectively. Thus, it is folded and bonded to the absorbent main body 5 side.

  The length of the outer package 10 is preferably 400 to 1000 mm, more preferably 500 to 1000 mm. The width W2 [see FIGS. 2 and 3 (b)] of the exterior body 10 in the crotch portion C is preferably 60 to 250 mm, and more preferably 80 to 200 mm.

In the disposable diaper 1 of this embodiment, the magnitude relationship of the width W1-W4 of the said structural member is prescribed | regulated as follows.
In the unfolded state, the width W1 of the absorbent main body 5 in the crotch portion C is wider than the width W2 of the exterior body 10 in the crotch portion C. The width W1 of the absorbent main body 5 in the crotch portion C means the width of the narrowest portion. The width W2 of the exterior body 10 in the crotch portion C means the width of the narrowest portion. The width W1 of the absorbent main body 5 in the crotch portion C is preferably 30 mm or more, and more preferably 40 mm or more wider than the width W2 of the exterior body 10 in the crotch portion C.

  The width W2 of the exterior body 10 in the crotch portion C is wider than the width W3 of the absorbent body 4 in the crotch portion C. The width W3 of the absorbent body 4 in the crotch portion C means the width of the narrowest portion. The width W2 of the exterior body 10 in the crotch portion C is preferably 20 mm or more larger than the width W3 of the absorbent body 4 in the crotch portion C, and more preferably 30 mm or more.

  The width W3 of the absorbent body 4 in the crotch portion C is equal to or greater than the width W4 of the main body joint portion 13 in the crotch portion C. This width relationship extends over the entire length of the disposable diaper 1. The width W3 of the absorbent body 4 in the crotch portion C is preferably 10 mm or more larger than the width W4 of the main body joint portion 13 in the crotch portion C, and more preferably 20 mm or more.

As a material of the constituent member of the disposable diaper 1 of the present embodiment, a material usually used in the technical field can be used without particular limitation.
For example, as the surface sheet 2, a hydrophilic and liquid-permeable nonwoven fabric or an apertured film can be used. As the back sheet 3, a liquid-impermeable (including liquid-impermeable) material or a water-repellent material can be used. As the liquid-impermeable material, a resin film, a laminate material of a resin film and a nonwoven fabric, or the like can be used. As the water-repellent material, a water-repellent nonwoven fabric or the like can be used.

As the absorbent body 4, a fiber aggregate made of pulp fiber, continuous fiber (tow) or the like, or a fiber aggregate and a water absorbent polymer (mixed product of water absorbent polymer and fiber material) is used. be able to.
As each elastic member, a thread-like member (thread rubber or the like), a belt-like member having a predetermined width (flat rubber or the like), or the like is preferably used. Examples of the material of each elastic member include natural rubber, synthetic rubber such as styrene-butadiene, butadiene, isoprene, and neoprene, EVA, stretchable polyolefin, urethane, and the like.

  In the disposable diaper 1 of the first embodiment, in the unfolded state, the size relationship between the widths W1 to W4 of the component members is defined as described above, and the inner edge 32 of the folded back sheet 3 is the crotch portion. In C, it is curved so as to be convex outward in the width direction, and the side elastic member 61 is curvedly disposed along the inner edge 32 of the curved back sheet 3.

  Therefore, at the time of wearing, the side gathers of the absorbent main body 5 rise from the side end of the absorbent body 4 and the crotch portion of the absorbent main body 5 is apparently narrow, so that the leg can be easily inserted into the leg opening 8. Become. Moreover, since only the seat width of the constricted part of the absorbent main body 5 becomes the standing height of the side gathers, the standing height of the side gathers does not become too high, and the fit between the crotch parts is also high.

  Next, a second embodiment, which is an embodiment of the second invention, and a third embodiment, which is an embodiment of the third invention, will be sequentially described. About 2nd Embodiment and 3rd Embodiment, it demonstrates centering on a different point from 1st Embodiment, description is abbreviate | omitted about the same point, and attaches | subjects the same code | symbol. Therefore, the description of the first embodiment is applied as appropriate to the second embodiment and the third embodiment.

  The disposable diaper 1 of 2nd Embodiment is demonstrated referring FIGS. 6-10. In the disposable diaper 1 of 2nd Embodiment, as shown in FIGS. 6-10, the both sides of the back surface sheet 3 are turned inward in the width direction, and the skin of the surface sheet 2 at least in the vicinity of both ends in the longitudinal direction. It is joined to the contact surface side. Specifically, both side portions of the back sheet 3 are folded twice toward the inner side in the width direction, and on the skin contact surface side of the top sheet 2 in substantially the entire area of the abdominal side portion A and the back side portion B. It is joined. Such a structure is the same as that of the disposable diaper 1 of 1st Embodiment.

  Thus, in the disposable diaper of the second embodiment, the inner edge 32 of the folded back sheet 3 is linear along the longitudinal direction, and the inner edge 32 of the folded back sheet 3 has In the crotch portion C, a large number of cuts G are formed. In the present embodiment, the cut G extends over the entire crotch portion C.

  The cut G extends from the inner edge 32 of the back sheet 3 outward in the width direction. A large number of slits G are formed in the back sheet 3 that is folded twice in the folded region 31 at equal intervals in the longitudinal direction. Therefore, the longitudinal cross-sectional shape along the width direction of the notch G becomes a loop shape as shown in FIG.

  The width W7 (see FIG. 10) along the diaper width direction of the notch G is preferably 2 to 30 mm, more preferably 5 to 25 mm. The interval between the notches G is preferably 2 to 30 mm, more preferably 2 to 15 mm.

  A side elastic member 61 is disposed in the folded back side sheet 3 at a position outward in the width direction from the notch G. Specifically, the two side elastic members 61 are sandwiched between the back sheet 3 folded twice in the folded region 31 and arranged in parallel in the width direction. That is, the side elastic member 61 is disposed on the outer side in the width direction in the folded region 31 so that a region where a cut G is formed on the inner edge 32 side of the folded region 31 is formed. The adhesive is not attached to the notch G, and therefore the region where the notch G is formed in the inner edge 32 of the folded region 31 is flexible and soft to the touch.

  It is preferable that a lotion agent is attached to the region where the cut G is formed in the inner edge 32 of the folded back sheet 3. When the lotion agent is adhered to the region, friction with the wearer's skin can be reduced. Examples of the lotion include liquid paraffin, silicone oil, animal and vegetable oils (olive oil, jojoba oil, safflower oil, squalane, squalene, etc.), mono, di, triglyceride, aliphatic ether, isostearyl-cholesterol ester, and the like. It is done.

Moreover, it is preferable that the component which protects skin with a lotion agent is adhered to this area | region. Here, the component for protecting the skin refers to a component having an effect of preventing skin irritation, or an effect of returning the skin state to normal such as anti-inflammatory and antibacterial properties.
Examples of components that protect the skin include various plant extracts, sericin, chitosan, ceramides, collagen, and the like.

In the disposable diaper of the second invention, as shown in FIG. 11, the side elastic member 61 is arranged to be curved so as to protrude outward in the width direction at the crotch portion C, and has a large number of cuts G. The outer ends in the width direction can be arranged along the curved shape of the side elastic member 61.
Specifically, in the form shown in FIG. 11, the form itself of the folded area 31 of the back sheet 3 is the same as the folded area 31 of the back sheet 3 in the second embodiment shown in FIGS.

  Thus, the side elastic member 61 is disposed so as to be curved so as to protrude outward in the width direction at the crotch portion C, similarly to the side elastic member 61 in the first embodiment. Further, the multiple notches G are gradually made different in the width W7 along the diaper width direction so that a line virtually connecting the outer ends in the width direction follows the curved shape of the side elastic member 61. .

  In the disposable diaper 1 of the second embodiment, both side portions of the back sheet 3 are folded back inward in the width direction and joined to the skin contact surface side of the top sheet 2 at least in the vicinity of both ends in the longitudinal direction. A large number of cuts G are formed in the crotch portion C at the inner edge of the folded back sheet 3. A side elastic member 61 is disposed in the folded back side sheet 3 at a position outward in the width direction from the notch G. The adhesive is not attached to the notch G.

  Therefore, even if the side gathers of the absorbent main body 5 in the crotch portion C stand up, the tip of the side gathers has a structure that easily deforms due to the presence of a large number of notches G. Side gathers do not get in the way when inserted, and the leg can be easily inserted into the leg opening 8. Moreover, since the front end portion of the side gather is deformed, the standing height of the side gather does not become too high, and the fit of the crotch portion is also high.

The disposable diaper 1 of 3rd Embodiment is demonstrated referring FIGS. 12-14.
The disposable diaper 1 of 3rd Embodiment has the structure similar to the disposable diaper of 2nd Embodiment except for a one part structure. Specifically, as shown in FIGS. 12 to 14, unlike the second embodiment, the notch G is not provided in the folded region 31 of the back sheet 3 in the third embodiment.

Furthermore, in the third embodiment, the width direction elastic member 62 is disposed in the absorbent main body 5 in the crotch portion C along the width direction across both side portions of the absorbent main body 5. Specifically, the width-direction elastic member 62 absorbs between the absorber 4 and the back sheet 3 in the narrowest portion of the absorber 4 in the crotch portion C in the region where the absorber 4 is disposed. In the area where the body 4 is not disposed, one is disposed between the top sheet 2 and the back sheet 3.
Other configurations are the same as those of the disposable diaper of the second embodiment.

  In the disposable diaper 1 of 3rd Embodiment, the side elastic member 61 is arrange | positioned at the both sides of the absorptive main body 5, and the width direction elastic member 62 is arrange | positioned at the absorptive main body 5 in the crotch part C. ing. Therefore, both side portions of the absorbent main body 5 in the crotch portion C contract in the width direction due to the contraction force of the width direction elastic member 62. Therefore, the effective opening area of the leg opening 8 is unlikely to be small, and the leg can be easily inserted into the leg opening 8. Moreover, the standing height of the side gathers does not become too high, and the fit between the crotch parts is also high.

As mentioned above, although preferable embodiment of the disposable diaper of this invention (1st invention, 2nd invention, 3rd invention) was described, this invention is not restrict | limited to the embodiment mentioned above, The range which does not deviate from the meaning of this invention Various changes can be made.
For example, in the second invention, the inner edge 32 of the back sheet 3 can be a shape that is not folded back. In that case, the longitudinal cross-sectional shape along the width direction of the notch G is as shown in FIG. It becomes a simple sheet piece.

In the third aspect of the invention, a plurality of the width direction elastic members 62 can be arranged in parallel with being spaced apart in the longitudinal direction. In this case, the lengths of the plurality of width direction elastic members 62 may be the same or different.
The part arrange | positioned between the absorber 4 and the back surface sheet 3 in the width direction elastic member 62 does not necessarily need to have a stretching property.

  Each structure of 1st invention, 2nd invention, and 3rd invention can be combined suitably. For example, the width direction elastic member in the 3rd invention can be provided in the 1st invention or the 2nd invention.

FIG. 1 is a perspective view showing a disposable diaper according to a first embodiment which is an embodiment of the first invention. FIG. 2 is a plan view showing a state in which the disposable diaper shown in FIG. 1 is separated and developed at the side seal portion, and the elastic member of each portion is expanded and expanded in a planar shape. 3A is a cross-sectional view taken along line AA shown in FIG. 2, and FIG. 3B is a cross-sectional view taken along line BB shown in FIG. FIG. 4 is an exploded perspective view showing a state where the disposable diaper shown in FIG. 1 is virtually separated into an absorbent main body and an exterior body. FIG. 5 is a plan view showing an absorbent main body in the disposable diaper shown in FIG. 1. FIG. 6 is a plan view showing a state in which the disposable diaper according to the second embodiment, which is an embodiment of the second invention, is separated and expanded at the side seal portion, and the elastic member of each portion is extended and expanded in a planar shape (FIG. 2). Corresponding figure). 7A is a cross-sectional view taken along the line AA shown in FIG. 6, and FIG. 7B is a cross-sectional view taken along the line BB shown in FIG. FIG. 8 is a longitudinal sectional view along the width direction showing a cut in the disposable diaper shown in FIG. 6. FIG. 9 is an exploded perspective view showing a state in which the disposable diaper shown in FIG. 6 is virtually separated into an absorbent main body and an exterior body (corresponding to FIG. 4). FIG. 10 is a plan view showing an absorbent main body in the disposable diaper shown in FIG. 6 (corresponding to FIG. 5). FIG. 11: is a top view which shows the modification of the absorptive main body in 2nd invention (corresponding figure of FIG. 10). FIG. 12 is a plan view showing a state in which the disposable diaper according to the third embodiment, which is an embodiment of the third invention, is separated and expanded at the side seal portion, and the elastic member of each portion is expanded and expanded in a planar shape (FIG. 2). Corresponding figure). FIG. 13 is an exploded perspective view (corresponding to FIG. 4) showing a state where the disposable diaper shown in FIG. 12 is virtually separated into an absorbent main body and an exterior body. 14 is a plan view (corresponding to FIG. 5) showing an absorbent main body in the disposable diaper shown in FIG. FIG. 15 is a longitudinal sectional view (corresponding to FIG. 8) showing a modified example of the cut in the second invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Back sheet 31 Folding area | region 32 Inner edge 4 Absorber 5 Absorbent main body 61 Side elastic member 62 Width direction elastic member 7 Waist opening 8 Leg opening 10 Exterior body 13 Main body junction part A Abdominal side part B Back side C Crotch

Claims (10)

A top sheet, a back sheet, and an absorbent main body having an absorbent body interposed between both sheets, and an exterior body joined to the non-skin contact surface side of the absorbent main body by a main body joint portion, and abdominal in the longitudinal direction A disposable diaper having a part, a crotch part and a back side part,
The absorbent body has a substantially hourglass shape in which the center part in the longitudinal direction of both side edges thereof is bound toward the inner side in the width direction,
Both side portions of the back sheet are folded inward in the width direction and bonded to the skin contact surface side of the top sheet at least in the vicinity of both ends in the longitudinal direction,
The inner edge of the folded back sheet is curved so as to protrude outward in the width direction at the crotch portion, and the side elastic member is curved along the inner edge of the curved back sheet. Disposable diapers that are arranged.   The disposable diaper according to claim 1, wherein a curved width of the inner edge of the curved back sheet is 5 to 45 mm. A top sheet, a back sheet, and an absorbent main body having an absorbent body interposed between both sheets, and an exterior body joined to the non-skin contact surface side of the absorbent main body by a main body joint portion, and abdominal in the longitudinal direction A disposable diaper having a part, a crotch part and a back side part,
The absorbent body has a substantially hourglass shape in which the center part in the longitudinal direction of both side edges thereof is bound toward the inner side in the width direction,
Both side portions of the back sheet are folded inward in the width direction and bonded to the skin contact surface side of the top sheet at least in the vicinity of both ends in the longitudinal direction,
A disposable diaper in which a large number of cuts are formed in the crotch portion at the inner edge of the folded back sheet. The folded back sheet is provided with a side elastic member at a position outward in the width direction from the notch, and the side elastic member is convex outward in the width direction at the crotch portion. Is curved so that
The disposable diaper according to claim 3, wherein end portions in the width direction of the plurality of cuts are arranged along a curved shape of the side elastic member.   The disposable diaper according to claim 3 or 4, wherein a lotion agent is attached to a region where the cut is formed in the inner edge of the folded back sheet. A top sheet, a back sheet, and an absorbent main body having an absorbent body interposed between both sheets, and an exterior body joined to the non-skin contact surface side of the absorbent main body by a main body joint portion, and abdominal in the longitudinal direction A disposable diaper having a part, a crotch part and a back side part,
The absorbent body has a substantially hourglass shape in which the center part in the longitudinal direction of both side edges thereof is bound toward the inner side in the width direction,
In the deployed state, the width of the absorbent main body in the crotch portion is wider than the width of the exterior body in the crotch portion, and the width of the exterior body in the crotch portion is wider than the width of the absorber in the crotch portion. The width of the absorbent body in the crotch portion is equal to or greater than the width of the main body joint portion in the crotch portion,
Side elastic members are disposed on both sides of the absorbent main body,
The disposable diaper by which the width direction elastic member is arrange | positioned at the said absorptive main body in the said crotch part.   The disposable diaper according to any one of claims 1 to 6, wherein a width of the absorbent main body in the crotch portion is 30 mm or more wider than a width of the exterior body in the crotch portion.   The disposable diaper according to any one of claims 1 to 7, wherein a width of the exterior body in the crotch portion is 20 mm or more wider than a width of the absorbent body in the crotch portion.   The disposable diaper according to any one of claims 1 to 8, wherein a width of the absorbent body in the crotch portion is 10 mm or more wider than a width of the main body joint portion in the crotch portion.   The disposable diaper according to any one of claims 1 to 9, wherein the width of the folded back sheet is 10 to 50 mm.

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