JP3648182B2 - Disposable diapers - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a disposable diaper.
[0002]
[Prior art]
Conventionally, in a disposable diaper, the left and right side edge portions of the inner surface, extending in the longitudinal direction of the front and back bodies around the crotch region, to prevent side leakage of body fluid by providing a cuff which has a standing propensity from the inner surface of the diaper art It is known.
[0003]
FIG. 5 is a partially broken plan view showing an example of a conventional disposable diaper. This diaper 1 has a diaper body 5 comprising a liquid-permeable top sheet 2, a liquid-impervious back sheet 3, and an hourglass-type liquid-absorbent core 4 interposed between the two sheets 2 and 3, It has a longitudinally front body 6 of the main body 5, a rear body 7, and a crotch region 8 interposed between them both body 6,7. Cuffs 10 that extend in the longitudinal direction of the front and rear bodies 6, 7 and the crotch region 8 and can come into contact with the wearer's crotch are attached to the left and right side edges of the main body 5 . A leg-around elastic member 13 extending in the longitudinal direction is attached to the side edges of the wearer so as to allow close contact with the wearer's leg. The elastic member 13 is joined to the inner surface of the back sheet 3 in an extended state. A pair of tape fasteners 12 extend from both side edges of the back body. Cuff 10 is formed from a rectangular sheet piece having a width W except its margin, inner edge 25 is a free edge, the elastic member 19 in the longitudinal direction that are bonded in a stretched state. The outer edge portion 26 parallel to the inner edge portion 25 and the front and rear edge portions 27 and 28 are joined to the inner surface of the diaper. When such a diaper 1 is worn, the elastic member 19 contracts and the cuff 10 tends to stand above the top sheet 2, and the cuff 10 opens to the inside of the diaper 1 between the top sheet 2 and the pocket. (Not shown). In addition, when the cuff 10 stands substantially vertically in the crotch region 8, it becomes a barrier having a height W against excrement. Such a diaper 1 is disclosed in, for example, US Pat. No. 4,695,278.
[0004]
[Problems to be solved by the invention]
By the way, even if the worn diaper falls down and the gap between the crotch area and the wearer's crotch becomes large, the height of the standing cuff can prevent the side leakage of excrement. it can. To do so in the prior art, the width W may be increased. However , when the width W is widened, there is a problem that the cuff covers the surface sheet widely to reduce the permeable area of the excrement, and as a result, the excrement tends to leak sideways.
[0005]
Therefore, the present invention folds the cuff that extends outward in at least the crotch region of the diaper to the inner surface side of the diaper at its intermediate portion in the width direction so that the absorbability of the diaper is not hindered even if the width of the cuff is widened. The challenge is to do.
[0006]
[Means for Solving the Problems]
The present invention uses the following means to solve the above problems.
[0007]
The present invention includes a liquid-permeable topsheet and liquid-impermeable back sheet, is composed of a liquid-absorbent core interposed between these sheets, and the front body and the back body in the longitudinal direction, located between them both body to and a crotch region, a pair of side flaps from both side edges of the core to the width outwardly extends, said longitudinal extending leg elastic members in the vicinity of the outer edge of the side flaps are attached It is premised on a disposable diaper in which a stretchable cuff that extends in the longitudinal direction of the front and back bodies and the crotch region and has a tendency to stand up above the top sheet is attached to the inner surface of the side flap .
[0008]
Features of our Keru present invention to such a premise, the core is formed in an hourglass-type having an arcuate concave portion to said crotch region, said side flap, a circle as parallel to the concave portion of the core The cuff is cut out in an arc shape, and the cuff has a contour line that forms substantially the same arc as the side flap and has a fixed side edge joined to the inner surface of the side flap, and a contour line that defines a straight line. A free edge located on the opposite side of the fixed edge, a free intermediate part located between the fixed edge and the free edge, and a fixed front and rear end edge lying in the width direction of the diaper A folding line extending in the longitudinal direction is formed in the free intermediate part, the free intermediate part is bent toward the inner surface side of the diaper along the folding line, and a part extending from the fixed edge to the folding line; And a section from the folding line to the free edge Lies in that it is.
[0009]
One preferred embodiment of the present invention, the elastic members extending in the longitudinal direction are attached, et al under tension to the free side edge.
[0010]
[0011]
[Action]
In thus constituted diaper, free middle portion of the cuff from that has been bent to the inner side of the diaper via a folding line, the cuff be wider cuff is not able to cover a wide surface sheet.
[0012]
【Example】
The details of the disposable diaper according to the present invention will be described with reference to the accompanying drawings.
[0013]
FIG. 1 is a partially broken plan view of a disposable diaper 1. The diaper 1 includes a liquid-permeable top sheet 2, a liquid-impervious back sheet 3, and a liquid-absorbent core 4 interposed between the two sheets 2 and 3 . The diaper 1 has a front body 6 and the back body 7 in the longitudinal direction and a crotch region 8 interposed between them both body 6,7. Liquid-absorbent core 4 presents an hourglass-like planar shape and has a concave portion 14 for improving the fit of the leg-to the crotch region 8. The front and back sheets 2 and 3 extend outward from the peripheral edge of the core 4 and are joined to each other in a watertight manner at the extended portions . Extending portions of the top- and backsheets 2, 3 are formed a pair of left and right leg side flaps 11A extending in the longitudinal direction and a waist flap 11B extending in the front and back bodies 6,7 in the width direction. A pair of stretchable cuffs 10 extending in the longitudinal direction is attached to the inner surface of the side flap 11A . The cuff 10 is disposed in the front and rear bodies 6 and 7 and the crotch region 8. A leg-hole elastic member (first elastic member) 13 extending in the longitudinal direction is attached to the side flap 11A . Leg elastic members 13 are interposed between the top- and backsheets 2, 3 are continuously or intermittently joined to these sheets 2, 3 in a state of being stretched in the longitudinal direction. A pair of tape fasteners 12 extending in the width direction are attached from the left and right side edges of the back body 7.
[0014]
FIG. 2 is an end view taken along line XX of FIG. 1 and shows details of the cuff 10 in the crotch region 8. The cuff 10 is formed from a comfortable sheet piece such as a non-woven fabric, preferably a liquid-impervious sheet piece, more preferably a gas-permeable liquid-impervious sheet piece . The cuff 10 is located between the fixed side edge 17 fixed to the side flap 11 </ b> A, the free edge 18 located on the opposite side of the fixed side edge 17, and the fixed side edge 17 and the free edge 18. It has a free intermediate portion 20 and fixed front and rear end edges 27, 28 that lie in the width direction of the diaper 1. The fixed side edge portion 17 is joined to the top sheet 2 via a hot melt adhesive 16. The free edge portion 18 and the intermediate portion 20 are not joined to the side flap 11A. An elastic member 19 extending in the longitudinal direction is joined to the free edge 18 in an extended state. A folding line 15 extending in the longitudinal direction is formed in the intermediate portion 20. The intermediate portion 20 is bent toward the inner surface side of the diaper 1 via the folding line 15. Intermediate portion 20 has a portion 17A of the width A from the fixed edge side portion 17 reaches the folding lines 15, are divided into a portion 17B having a width B extending from the fold line 15 to the free edge 18. The cuff 10 forms a pocket 21 that opens inward in the width direction of the diaper 1.
[0015]
FIG. 3 is an end view taken along line YY of FIG. 1 and shows details of the structure of the fixed rear edge 28 of the cuff 10. The fixed rear end edge portion 28 of the cuff 10 is bent toward the inner surface side of the diaper 1 via the folding line 15. The fixed rear end edge 28 is laid down in the width direction of the diaper 1, the overlapping portions are joined via the hot melt adhesive 16 , and the surface facing the top sheet 2 is also joined to the sheet 2 via the adhesive 16. Has been. Therefore, the pocket 21 is in a closed state at the fixed rear edge 28 . The structure of the fixed front end edge 27 of the cuff 10 is the same as that of the fixed rear end edge 28 .
[0016]
When the diaper 1 configured as described above is worn, the front and rear bodies 6 and 7 and the crotch region 8 of the diaper 1 are curved in the longitudinal direction , and the elastic member 19 contracts. 2, the cuff 10 stands up from the inner surface of the diaper 1 with the fixed side edge 17 as a base end and contracts as the elastic member 19 contracts, and is bent at the intermediate portion. A barrier 20 is developed in the inseam area 8 by developing the width A + B. In the cuff 10 , the front and rear end edges of the free edge 18 are joined to the inner surface of the diaper 1, so that the barrier height gradually decreases as the fixed front and rear end edges 27 and 28 are approached.
[0017]
(1) in FIG. 4 is a plan view of the disposable diaper 1 with a different embodiment 1, in Fig. 4 (2) is a development view of the cuff 10 joined to the diaper 1 of this. The diaper 1 includes a liquid-permeable top sheet 2, a liquid-impervious back sheet 3, and a liquid-absorbent core 4 interposed between the two sheets 2 and 3. The diaper 1 has a front body 6 and a back body 7 in the longitudinal direction, and a crotch region 8 interposed between the both bodies 6 and 7. The liquid-absorbent core 4 has an hourglass shape and has a recess 14 in the crotch region 8 for improving the fit around the legs. The front and back sheets 2 and 3 extend outward from the peripheral edge of the core 4 and are joined to each other in a watertight manner at the extended portions. The extended portions of the front and back sheets 2 and 3 form a pair of left and right leg side flaps 11A extending in the longitudinal direction, and waist waist flaps 11B extending in the width direction on the front and rear bodies 6 and 7. Sa Idofurappu 11A is notched in an arc shape so as to parallel the concave portion 14 of the core 4. A pair of stretchable cuffs 10 extending in the longitudinal direction is attached to the inner surface of the side flap 11A. The cuff 10 is disposed in the front and rear bodies 6 and 7 and the crotch region 8. A leg-wrapping elastic member (first elastic member) 13 extending in the longitudinal direction along the recessed portion 14 of the core 4 is attached to the side flap 11A. The leg-hole elastic member 13 is interposed between the front and back sheets 2 and 3 and is joined to the sheets 2 and 3 continuously or intermittently in a state of being stretched in the longitudinal direction. A pair of tape fasteners 12 extending in the width direction are attached from the left and right side edges of the back body 7.
[0018]
The cuff 10 is located between the fixed side edge 17 fixed to the side flap 11 </ b> A, the free edge 18 located on the opposite side of the fixed side edge 17, and the fixed side edge 17 and the free edge 18. It has a free intermediate portion 20 and fixed front and rear end edges 27, 28 that lie in the width direction of the diaper 1. As shown in FIG. 4 (2), the fixed side edge portion 17 has a substantially same arc as that of the side flap 11A. The fixed side edge portion 17 is joined to the top sheet 2 via a hot melt adhesive 16. The free edge portion 18 and the intermediate portion 20 are not joined to the side flap 11A. The free edge 18 has a straight outline. An elastic member (second elastic member) 19 extending in the longitudinal direction is joined to the free edge 18 in an extended state. A folding line 15 extending in the longitudinal direction is formed in the intermediate portion 20. The intermediate portion 20 is bent along the folding line 15 toward the inner surface side of the diaper 1. The intermediate portion 20 is divided into a portion 17A having a width A extending from the fixed side edge portion 17 to the folding line 15 and a portion 17B having a width B extending from the folding line 15 to the free edge portion 18. The cuff 10 forms a pocket 21 that opens inward in the width direction of the diaper 1. The fixed front and rear end edges 27 and 28 of the cuff 10 are laid down in the width direction of the diaper 1, the overlapping portions are joined through the hot melt adhesive 16, and the surface facing the top sheet 2 is also through the adhesive 16. Are joined to the sheet 2. Therefore, the pockets 21 are closed at the fixed front and rear end edges 27 and 28. When the diaper 1 is worn, the front and rear bodies 6, 7 and the crotch region 8 of the diaper 1 are curved in the longitudinal direction, and the elastic member 19 contracts. As the elastic member 19 contracts, the cuff 10 rises from the inner surface of the diaper 1 to the upper side of the top sheet 2 with the fixed side edge 17 as a base end, and the bent intermediate portion 20 expands to increase the width A + B. A barrier is formed in the crotch region 8. In addition, since the surface sheet 2 is hardly bonded at the portion covering the upper surface of the liquid-absorbent core 4, the liquid-permeable area of the surface sheet 2 is not reduced by the bonding area of the cuff 10. Further, the cuff 10 has the folded middle part 20 overlapped only in the crotch region 8 and the fixed front and rear end edges 27 and 28 do not overlap each other. There will be no hindrance.
[0019]
The entire cuff 10 can be made of an elastic sheet such as an elastomer. In that case, the elastic sheet may be bonded to the inner surface of the diaper 1 in an extended state, and the second elastic member 19 may be omitted. Conventional materials in the technical field may be used for the front and back sheets 2, 3 and the liquid-absorbent core 4. Adhesives such as hot-melt adhesives and adhesives are used for joining each member, and heat welding technology for each member. Can be used. The waist circumference direction of the diaper 1 can be made elastic by joining an elastic member as necessary.
[0020]
【The invention's effect】
In the disposable diaper according to the present invention, since the cuff is folded back to the inner surface side at least in the crotch region, the cuff does not cover the top sheet widely even if its width is wide. Therefore, the cuff does not reduce the liquid absorption area of the top sheet and impair the liquid absorption performance.
[0021]
Such a cuff forms a pocket that opens toward the inside of the diaper when it does not stand up to prevent side leakage of the excrement, and when it stands up, it becomes a tall barrier against the excrement and the diaper and wearer It is possible to prevent side leakage by closing the gap with the crotch.
[Brief description of the drawings]
FIG. 1 is a partially broken plan view of a diaper.
2 is an end view taken along line XX in FIG.
FIG. 3 is an end view taken along line YY in FIG. 1;
4 is a partially broken plan view of a diaper in a mode different from FIG. 1, and FIG. 4 (2) is a development view of a cuff.
FIG. 5 is a plan view of a diaper according to the prior art.
[Explanation of symbols]
1 disposable diaper 2 liquid-permeable topsheet 3 liquid-impervious backsheet 4 liquid-absorbent core 6 front body 7 back body 8 crotch region 10 stretchable cuffs 11A side flaps 13 elastic member 15 folding line 17 fixed side edge portions 18 free Edge 20 Free intermediate part 27 Fixed front edge 28 Fixed rear edge

Claims (2)

A liquid-permeable topsheet and liquid-impermeable back sheet, is composed of a liquid-absorbent core interposed between these sheets, and the front body and the back body in a longitudinal direction, a crotch region extending between these two body has a pair of side flaps from both side edges of the core to the width outwardly extends, said longitudinal extending leg elastic members in the vicinity of the outer edge of the side flap is attached, the front and back bodies In a disposable diaper in which a stretchable cuff extending in the longitudinal direction of the crotch region and having a propensity for standing upwards of the top sheet is attached to the inner surface of the side flap ,
The core is formed in an hourglass shape having an arcuate recess in the crotch region, the side flaps are cut out in an arc so as to be parallel to the recess in the core, and the cuff is A fixed side edge having an outer shape line defining the same arc as the side flap and joined to the inner surface of the side flap; and a free edge having an outer shape line defining a straight line and located on the opposite side of the fixed edge Part, a free intermediate part located between the fixed edge part and the free edge part, and a fixed front and rear end edge part lying in the width direction of the diaper,
A folding line extending in the longitudinal direction is formed in the free intermediate part, the free intermediate part is bent toward the inner surface side of the diaper along the folding line, and a part from the fixed edge part to the folding line; The diaper characterized in that it is divided into a portion extending from the folding line to the free edge . Longitudinally extending elastic member, said free side edge diaper of claim 1 wherein is mounted et al under tension to part.

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