JPH09276328A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper, which prevents permeation and leakage of excreta, by preventing collapse of cubic gathers. SOLUTION: A part positioned in an absorbent body 3 side of a side sheet 6 is branched at a side flap 5 to form a stereoscopic gather(s) 8, a stretchable elastic body 15 is set in a strestched condition on the side edge along the lonitudinal direction to form a free edge 11 and is folded on the side flap 5 so that a part between the branch point and the free edge is positioned outer than the branch part and the free edge, the both end parts in the longitudinal direction are adhered and fixed to form the folded part, and, further, the surface sheet is extended outward from the both side edges of the absorbent body in the longitudinal direction, and the side edge part is joined to the folded part 12 of the stereoscopic gather 8. Thereby, when a diaper is put on, the stereoscopic gather 8 in a chevron shape standing on the branch point on the side flap 5 as the first base end part and the adhering part with the absorbent body on the surface sheet as the second base end part in the diaper crotch area so that the folded part is positioned outer than the first base end part and the free edge is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper, which is effective for preventing leakage and falling of a solid gather.

[0002]

2. Description of the Related Art A disposable diaper has an absorbent body composed of a hydrophilic sheet, a cotton-like pulp, a super absorbent polymer between a liquid-permeable top sheet and a liquid-impermeable back sheet. It has been configured. In recent years, since the super absorbent polymer has been used in the absorbent body of the disposable diaper, it has been able to exert a great effect on the leakage and reversion of urine and the like. However, since the super absorbent polymer has an extremely slow urine absorption rate as compared with cotton-like pulp, it may leak if urine, loose stools, etc. are temporarily excreted. For this reason, it is necessary to take measures to prevent leakage even with a large amount of urine or loose stool.

In order to solve these problems, it has been proposed to arrange a three-dimensional gather outside the absorber. That is, in Japanese Examined Patent Publication No. 6-93901, a three-dimensional gather having a side flap containing a stretchable elastic body and functioning as a leak preventer includes the stretchable elastic body and is collapsed inside the diaper. There is known a diaper that is installed and forms a pocket portion between the absorbent sheet and the top sheet to prevent leakage. However, if the three-dimensional gathers are simply laid inside the absorber, the three-dimensional gathers do not stand upright on the absorber side when worn, and thus cannot function as a leak barrier against urine and loose stools. There are cases. Also, even if you are lucky to stand up, since it is standing upside down like a fall,
When the capacity of the pocket portion is reduced and a large amount of urine is excreted, the urine cannot be temporarily secured and leaks to the outside of the diaper. In addition, if the three-dimensional gather width is widened in order to increase the capacity, there is a problem that the area covered by the three-dimensional gathers becomes large and the absorption region becomes extremely narrow.

Further, in JP-A-2-271863, both side portions of a surface sheet are fixed to a barrier cuff,
It proposes a diaper in which a barrier cuff, a topsheet and an absorbent element form an absorbent pocket space for loose stool. In order to create the space formed by the barrier cuff, the topsheet and the absorbent element, the barrier cuff needs to be placed in close proximity to the absorbent body and a large volume pocket cannot be created. Further, in the examples shown in the publication, by extending the side portion of the topsheet, along the side portion along the inner surface of the barrier sheet, further by folding back along the upper surface of the absorber, An example is disclosed in which a topsheet covers the inside of the absorption pocket space. However, in general, the property of the surface sheet is meaningless since it does not absorb loose stools or urine because it has a small amount of absorption even though it has wettability.

Further, in Japanese Patent Laid-Open No. 4-295356, in a diaper having a substantially inwardly-folded barrier cuff, one proximal end is on a side flap and the other proximal end is on an absorber. , A diaper having two proximal ends and one distal end forming an isosceles triangle in an upright position, the apex of which is a barrier cuff located inward of the center. However, since the inner barrier cuffs extending from above the absorbent body are erected inside, it is not possible to make a large-capacity pocket, and the area that the barrier cuffs cover the absorbent body becomes large,
A leak occurs.

[0006]

SUMMARY OF THE INVENTION In view of the above situation, the present inventors have made it possible for a three-dimensional gather formed by a side sheet to stand up to one side in the outward direction and further to stand inward from the folding line. Moreover, the fact that the side edges of the surface sheet extend and are joined to the three-dimensional gathers to form a space at the bottom of the three-dimensional gathers is effective in preventing the three-dimensional gathers from collapsing, seeping out, and leaking. I came to the conclusion that there is. That is, since the three-dimensional gathers are folded and installed in a dogleg shape, it is possible to form a large-capacity pocket structure without hindering the absorption area on the absorbent body, which is extremely effective in preventing leakage. be able to. In addition, since the space is formed by two sheets with different bottoms of the three-dimensional gathers, it is effective in preventing the exudation of excrement, and also prevents the three-dimensional gathers from collapsing and stands up in a neat shape from the base end. Therefore, the leakproof effect is further exerted. The purpose of the present invention is
It is intended to provide a disposable diaper that is effective for preventing the three-dimensional gather from collapsing and preventing leakage and exudation.

[0007]

That is, the present invention is directed to a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber disposed between these sheets, and a longitudinal direction of the absorber. In a disposable diaper having side flaps extending outward from both side edges and a three-dimensional gather formed near both side edges of the absorbent body, the side flaps are both side edges in the longitudinal direction of the absorbent body of the back sheet. From the portion extending outward from the side sheet laminated on the side sheet, further between the back sheet and the side sheet forming the side flap, the stretchable elastic body is disposed in an extended state, In the three-dimensional gather, a portion of the side sheet located on the absorber side is formed by branching from the side flap, and a stretchable elastic body is arranged in an extended state at a side edge along the longitudinal direction. To form a free edge and fold it on the side flap so that the part between the branching point and the free edge is located outside the branching point and the free edge. Has been formed,
Furthermore, the surface sheet extends outward from both side edges in the longitudinal direction of the absorbent body, and the side edge portions thereof are joined to the folded portion of the three-dimensional gather, whereby the three-dimensional gather is attached to the crotch of the diaper when the diaper is worn. In the region, the folding point is located outside the first base end and the free edge with the branch point on the side flap as the first base end and the adhesive portion between the surface sheet and the absorber as the second base end. As described above, a diaper for use is characterized by being bent in a dogleg shape and standing upright.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the disposable diaper of the present invention having the above-mentioned structure, the three-dimensional gathers formed adjacent to the side flaps to which the side sheet and the back sheet are attached and further formed in the vicinity of both side edges of the absorber are The seat is formed by extending inward, and the first base end part that branches off from the side flaps and the inner part of the first base end part are freely bent when the elastic elastic body is sandwiched inside. It has an end and a fold formed between the first base end and the free end. The topsheet is joined to the absorber upper side to form a second base end, and the side edge of the topsheet is joined to the folded portion of the three-dimensional gather. Further, the three-dimensional gather is configured to extend outward from the base end portion between the folding portions and further extend inward between the folding portion and the free end portion. The three-dimensional gathers with these configurations are designed to be erected in the outward direction once by the contracting force of the elastic elastic body attached to the free end portion in the crotch region, and further erected inward from the folded portion. It has a structure that forms a large-capacity pocket and has excellent leakage prevention. In addition, the two sheets near the bottom of the three-dimensional gather create a space, which is effective not only for preventing the three-dimensional gather from collapsing, but also for preventing exudation and leakage.

[0009]

The present invention will now be described in more detail with reference to the drawings, but the present invention is not limited thereto. FIG. 1 shows a partially cutaway view of the disposable diaper of the present invention, and FIG. 2 shows an exploded perspective view of the disposable diaper of the present invention. FIG. 3 is a sectional view taken along line XX ′ in FIGS. 1 and 2, that is, a sectional view of a crotch portion of a diaper, showing an embodiment in which a three-dimensional gather is formed of a side sheet. FIG. 4 shows an embodiment of a cross-sectional view taken along the line YY ′ in FIGS. 1 and 2, that is, a cross-sectional view of the vertically opposed ends of the diaper.

Further, reference numeral 1 is a liquid-permeable topsheet (hereinafter also referred to as a topsheet), 2 is a liquid-impermeable backsheet (hereinafter also referred to as a backsheet), 3 is an absorber, 4 is a tape fastener, 5 is a side flap, 6
Is a side sheet, 7 is a leg elastic elastic body, 8 is a three-dimensional gather, 9 is a first base end portion, 10 is a second base end portion, 11 is a free edge, 12 is a folded portion, and 13 is a longitudinal end region. , 14
Indicates a space of a three-dimensional gather, and 15 indicates a three-dimensional gather elastic elastic body.

As shown in FIG. 1, the disposable diaper of the present invention comprises a liquid-permeable front sheet 1 and a liquid-impermeable rear sheet.
2 and an absorber 3 between them. Fastener tapes 4 are attached to both lateral edges of the absorber 3 on the back side, and are used when worn. As the surface sheet 1, a liquid-permeable nonwoven fabric made of polyester, polypropylene or the like, a woven fabric, a porous plastic film, a porous foam, a reticulated foam or the like is used. Further, natural fibers (for example, wood fibers, cotton fibers, etc.) may be used, and they can be manufactured from a wide range of materials such as a combination of synthetic fibers and natural fibers. In any case, since the topsheet 1 is a portion that comes into direct contact with the skin, it may be soft and comfortable to the touch.

The back sheet 2 is a liquid impermeable film such as polyethylene, a material obtained by laminating a liquid impermeable film with a non-woven fabric, a woven fabric or the like, or a non-leakable non-woven fabric,
There is no particular limitation as long as it is made of a woven cloth or the like, as long as the moisture in the absorbent body does not exude to the outside of the diaper. It may also be embossed in a pattern to give it a cloth-like appearance, or may be matte-finished. When a film is used, a known breathable film that is impermeable but allows only water vapor to pass through may be used, which is more preferable because it prevents stuffiness.

The absorber 3 includes a front surface sheet 1 and a back surface sheet 2.
It is sandwiched between and is mainly composed of cotton-like pulp, super absorbent polymer, etc., but it is not particularly limited, and it may be absorbent sponge, absorbent sheet, etc. I'm good. The cotton-like pulp in the present invention is a sheet of chemical pulp, mechanical pulp or chemical-mechanical pulp made into a cotton-like shape by a pulverizer. The pulp raw material is not limited to softwood, but hardwood, straw, bamboo, bagasse and the like are also applicable. In addition to the cotton-like pulp, synthetic fibers, heat-sealing components, adhesives, etc. may be contained.

As the super absorbent polymer, starch polymers, acrylic acid polymers, cellulose polymers, etc. having a weight of 5 can be used.
A material that absorbs 0 times or more water, and a polyacrylic acid-based material such as sodium polyacrylate is most suitable in terms of absorption performance. Further, the shape is not particularly limited, and may be fibrous, granular, sheet-like or the like. In the absorbent body, the superabsorbent polymer substance may be mixed with cotton-like pulp, and may be spread in layers between cotton-like pulp, or both of them may be used.

The shape of the absorber 3 is an hourglass type, a rectangular type,
There is no particular limitation, such as a T-shape, as long as the shape fits the crotch. Generally, in order to improve the wearing feeling, it is preferable that the crotch part has a narrow shape such as an hourglass shape or a T shape. Further, the absorber 3 may be wrapped by a hydrophilic sheet, or the hydrophilic sheet may be sandwiched in the absorber 3. The hydrophilic sheet may be a hydrophilic sheet such as water-absorbent paper or hydrophilic non-woven fabric.

The structure of the disposable diaper of the present invention is shown in FIG.
As shown in FIGS. 3 and 4, the topsheet 1 and the backsheet 2 have an absorber 3 therebetween, and side flaps 5 extending outward from both lateral edges of the absorber 3. .
In this case, the side flap 5 is configured by laminating the back sheet 2 and the side sheet 6. The side sheet 6 of the present invention may be made of the same material as the surface sheet 1 or a different material. The topsheet 1 may also serve as the sidesheet 6 and may be a single sheet, or may be two separate sheets. However, it is preferable that the surface sheet 1 disposed on the absorbent body 3 region is hydrophilic so that urine can be quickly absorbed by the absorbent body 3, and the side sheet 6 has stains such as urine from the absorbent body 3. It is more preferable that it is water repellent so that it does not come out.

In the vertical direction on the side flap 5 region, leg elastic elastic members 7 are arranged between the side sheet 6 and the back sheet 2, and gathers around the legs are formed. As the leg-stretch elastic body 7, an elastomer film, a polyurethane film, an elastomer foam,
Polyurethane foam, natural thread rubber, urethane thread rubber,
Flat rubber, heat-shrinkable film and the like are used, but the stretchable material is not particularly limited. The leg elastic elastic body 7 may be composed of one line or several lines parallel to each other, or not parallel to each other, or may be a straight line or a curved line. It should be arranged so that the crotch part fits. Good.

Further, as shown in FIG. 3, the disposable diaper of the present invention has three-dimensional gathers 8 formed near both side edges of the absorbent body 3. In FIG. 3, the three-dimensional gather 8
Of the side seat 6 is formed by branching upward from the side flap 5 and the side edge along the longitudinal direction thereof is formed by the three-dimensional gather elastic elastic body 15.
Is folded so as to wrap around, and a free edge 11 is formed, and a folded portion 12 is formed by folding so that an intermediate region thereof projects toward the outside of the diaper. The absorbent body 3 extends outward from both side edges, and the side edge portions are joined to the folded portion 12 of the three-dimensional gather 8. As a result, three-dimensional gather 8
Is the branch point on the side flap 5 as the first base end portion 9 and the adhesive portion of the surface sheet 1 with the absorbent body 3 as the second base end portion 10, and the folding portion 12 is the first base end portion 9 and the free edge 11. It is bent in a doglegged shape so as to be located on the outer side and stands up. That is, near the bottom of the three-dimensional gather 8,
A space 14 is formed by the two sheets, the topsheet 1 and the sidesheet 6. Therefore, the effect of preventing the exudates from seeping out from the three-dimensional gather 8 can be enhanced. Further, since the excrement enters into the space 14 of the three-dimensional gather and is temporarily held and then absorbed by the absorber 3, the leakage prevention effect can be further enhanced. Further, since the three-dimensional gather 8 is supported by the two base end portions, it is effective in preventing the three-dimensional gather 8 from falling. The fixing method may be a method using a hot melt adhesive, a heat seal welding method, an ultrasonic welding method or the like alone or a combination thereof, but any method that does not peel off even when wet with urine etc. The method of is also good.

The first base end portion 9 of the three-dimensional gather 8 may be located on the side flap 5, but it is located between the edge portion of the absorbent body 3 and the leg elastic elastic body 7 on the side flap 5. Preferably. When the first base end portion 9 is located inside the edge of the absorber 3, the absorption region becomes narrow and leakage occurs. Further, when the first base end portion 9 is positioned outside the leg elastic elastic body 7, the three-dimensional gather 8 is sandwiched between the wearer's skin and the leg elastic elastic member 7 when wearing the diaper. , Ceases to play the role of a leak barrier. Second base end 10
The position of is preferably located above the absorber 3. When the second base end portion 10 exists outside the absorber 3, the absorber 3
The portion that does not exist at all exists within the pocket structure of the three-dimensional gather 8. That is, a large amount of excreted urine and loose stools stop at the solid gathers 8, and the solid gathers 8
When it flows into the absorber 3 side along the wall surface of the
Urine and loose stools cannot be absorbed in a portion where no urine exists, and urine and the like accumulate in a pool in that portion. At this time, if a child wearing a disposable diaper moves even a little, leakage will occur.

The three-dimensional gather 8 has a free edge 11 in addition to the first base end portion 9. The free edge 11 is formed in a bag shape by bending the side edge portion of the side sheet 6 so as to wrap the three-dimensional gather elastic elastic body 15 inside, and is present at a position separated from the topsheet 1. The three-dimensional gather elastic elastic body 15 is not particularly limited as long as it is an elastic material, but may be the same material as the leg elastic elastic body 7 arranged in the side flap 5 or a different material. Further, one or several pieces may be arranged, and it is preferable that at least the bag-shaped crown of the three-dimensional gather 8 is not installed. In any case, the three-dimensional gather stretchable elastic body 15 may be arranged so that the three-dimensional gather 8 can stand upright.

The length of the free edge 11 of the three-dimensional gather 8 in the vertical direction may be at least the length covering at least the crotch region of the side edge of the absorber 3, and the free edge 11 of the vertical end regions 13 has a three-dimensional shape. It is preferable that the gather stretchable elastic body 15 is not arranged. Since the free edges 11 of the both end regions 13 in the vertical direction directly contact the abdomen and the back, the three-dimensional gather 8 is formed.
Is preferably not upright. If the three-dimensional gather 8 stands up in the abdomen and the back region, the wearing feeling becomes extremely poor. The folded width of the side edge portion of the side sheet 6 forming the free edge 11 may be greater than or equal to the width that encloses the three-dimensional gather elastic elastic body 15 installed therein.

The three-dimensional gather 8 has a folding portion 12 between the first base end portion 9 and the free edge 11. Folding part 1
The position of 2 is preferably outside from both side edge portions of the absorber 3 and inside of the side flap 5 region where the leg elastic elastic members 7 are arranged. When the position of the folded portion 12 is inward from both side edges of the absorber 3, the three-dimensional gathers 8 cover the absorber 3 and the absorption region becomes narrow, so that leakage frequently occurs. Conversely, when the position of the folded portion 12 is outside the position of the crotch elastic member 7 on the side flap 5 region, the three-dimensional gather 8 is placed between the wearer's skin and the leg elastic member 7 during wearing. Since it is sandwiched, the role of the three-dimensional gather 8 is not fulfilled and a leak occurs. In order to form the space 14 of the three-dimensional gather, the side edge portion of the topsheet 1 and the sidesheet 6 are adhesively fixed, and the position at that time is preferably the folding portion 12. When the fixed position is closer to the free end 11 than the folding portion 12, the three-dimensional gather 8 does not stand up in a dogleg shape.

The three-dimensional gather 8 having the first base end portion 9 and the second base end portion 10, the free edge 11 and the folding portion 12 arranged as described above is shown in FIG. 4 in the longitudinal end regions 13 of the diaper. Mounted as shown. That is, the diaper main body extends from the first base end portion 9 to the outer side of the diaper between the folding portions 12, and is further folded back to the inner side of the diaper between the folding portion 12 and the free edge 11. It is kept face down on the upper surface of. The folded portion 12 and the side sheet 6 are fixed to each other in both longitudinal direction end regions 13, and the free edge 11 and the top sheet 1 are further fixed.
Has been fixed.

Further, as shown in FIG. 3, the central region of the solid gather 8 corresponding to the crotch portion stands up by the contracting force of the solid gather stretchable elastic body 15 attached to the free edge 11. At this time, the three-dimensional gather 8 extends to the outside of the diaper between the first base end portion 9 and the folding portion 12, and is further folded back inward of the diaper between the folding portion 12 and the free edge 11. The gather 8 is erected in the outward direction from the first base end portion 9, and then the foldable portion 1
Stands inward from 2. That is, the three-dimensional gather 8 stands up in a dogleg shape from the first base end portion 9, and a pocket structure having a larger capacity is formed than simply tilting the three-dimensional gather 8 inward, which is extremely effective in preventing leakage. You can increase the effect.

The width of the three-dimensional gather 8, that is, the width of the first base end portion 9 and the free edge 11 is 1 cm to 7 cm, preferably 3 cm to 5 cm. If the width of the three-dimensional gather 8 is less than 1 cm, the standing height of the three-dimensional gather 8 becomes too low,
The leakproofness is impaired. On the other hand, if it exceeds 7 cm, the standing height of the three-dimensional gather 8 becomes too high, and it becomes easy to be pinched between the wearer's skin and the elastic elastic body 7 around the legs when wearing the diaper, resulting in poor mounting. Therefore, even a small amount of urine will leak.

The portion of the side sheet 6 forming the three-dimensional gather 8 plays a role of preventing leakage, and is therefore preferably water repellent. On the other hand, the portion of the topsheet 1 forming the three-dimensional gathers 8 is preferably hydrophilic or water-permeable. When the excrement enters the space 14 of the three-dimensional gather, the excrement is temporarily held, and after being stopped by the side sheet 6, the excrement is absorbed by the absorber, so that the leakage preventing effect is further exerted.

[0027]

EFFECT OF THE INVENTION The diaper of the present invention has a three-dimensional gather which has two base end portions on the side sheet and the absorber and which is bent in a dogleg shape so as to project toward the outside of the diaper. Even if a large amount of urine or loose stools is excreted at one time, the three-dimensional gathers function as a high leak-proof wall and form a large-capacity pocket structure, which is effective in preventing leakage. To do. Further, since a space is formed by two sheets near the lower part of the three-dimensional gather, not only is it effective for preventing leakage and seeping out, but also the problem that the three-dimensional gather does not stand up while lying down.

[0028]

[Brief description of drawings]

FIG. 1 shows a partially cutaway plan view of a disposable diaper of the present invention.

FIG. 2 shows an exploded perspective view of the disposable diaper of the present invention.

FIG. 3 is a sectional view taken along line XX ′ of the disposable diaper of FIGS. 1 and 2.

FIG. 4 is a sectional view taken along line YY ′ of the disposable diaper of FIGS. 1 and 2.

[Explanation of symbols]

 1. Liquid-permeable top sheet 2. Liquid-impermeable back sheet 3. Absorber 4. Tape fastener 5. Side flap 6. Side sheet 7. Leg elastic elastic body 8. Three-dimensional gather 9. First group End part 10. Second base end part 11. Free edge 12. Folding part 13. Both ends in the longitudinal direction 14. Space of three-dimensional gather 15. Three-dimensional gather stretchable elastic body

Claims (1)

[Claims] 1. A liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber arranged between these sheets, and a side flap extending outward from both longitudinal edges of the absorber. In the disposable diaper having a three-dimensional gather formed near both side edges of the absorber, the side flaps are portions extending outward from both side edges of the back sheet in the longitudinal direction of the absorber, and A stretchable elastic body is formed in a stretched state between the back sheet and the side sheet which are formed by the side sheets laminated on top of each other, and the three-dimensional gather is configured to absorb the side sheet. A portion located on the body side is formed by branching from the side flap, and a stretchable elastic body is arranged in a stretched state at a side edge along the longitudinal direction to form a free edge, and the branch is formed. Is folded on the side flap so that the part between the free edge and the free edge is located outside the branch point and the free edge, and both ends in the longitudinal direction are adhesively fixed to form a folded portion. The absorbent body extends outward from both side edges in the longitudinal direction, and the side edges thereof are joined to the folded portions of the three-dimensional gathers, so that when the diaper is worn, the three-dimensional gathers above the side flaps in the crotch region of the diaper. The branch point of the first base end portion, the adhesive portion of the surface sheet and the absorbent body as the second base end portion, so that the folding portion is located outside the first base end portion and the free edge, A disposable diaper characterized by being bent upright and standing upright.