JP2000107223A - Throw-away diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a throw-away diaper which is capable of obviating the wrinkling of cores and preventing the leakage of excrement. SOLUTION: This throw-away diaper 1 has end flaps 24 which extend outward in a longitudinal direction respectively from both end edges of the cores 4 and side flaps 23 which exist between these end flaps 24 and extend outward in a transverse direction from both side edges of the cores 4. The diaper described above is formed by joining elastic members 5 and 6 extending in the transverse direction in an extended state to at least one of the end flaps 24. The portions of the elastic members 5, 6 which exist in a portion W2 from the both side edge parts 4a of the cores 4 to the both side edge parts 7 of the end flaps 24 are intermittently joined to at least one inside surface of a top sheet 2 and a back sheet 3. The portion of the elastic members 5, 6 which exist in the portion W1 between both side edge parts 4a of the cores 4 are continuously joined to at least one inside surface of the top sheet 2 and the back sheet 3 at the overall length in the transverse direction, by which shrinkage force is substantially put in a non-developing state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a disposable diaper.

[0002]

2. Description of the Related Art A disposable diaper disclosed in Japanese Patent Application Laid-Open No. 8-154973 has a top sheet, a back sheet,
And an absorber interposed between these two sheets,
It has a front body, a back body, and a crotch located between these bodies in the longitudinal direction crossing the width direction, and both sides from the width direction central area of these bodies in the width direction of the edge portion of the front and rear bodies. An elastic member whose elongation rate gradually decreases toward the edge is joined in an extended state.

[0003]

Problems to be Solved by the Invention
In the diaper disclosed in Japanese Patent Publication No. 3 (1999), the contraction force of the elastic member extending to the widthwise central region having a high elongation rate acts to contract the core in the widthwise direction of the diaper. The elastic members joined to the front and rear bodies may be wrinkled due to the core bending if the elasticity of the elastic members exceeds the rigidity of the core even when the elastic stress is weak. When the core is wrinkled, there is a problem that a gap is opened between the wearer's skin and the diaper at both end edges of the front and rear body of the diaper, so that excrement easily leaks.

[0004] It is an object of the present invention to provide a disposable diaper capable of preventing excretion from leaking without wrinkling of the core.

[0005]

In order to solve the above-mentioned problems, the present invention is based on the premise that a liquid-permeable top sheet, a liquid-impermeable back sheet, and a sheet interposed between these two sheets. A pair of end flaps each comprising a liquid-absorbent core and extending longitudinally outward from each of both end edges of the core; and A disposable diaper having a pair of side flaps protruding and having at least one of the pair of end flaps joined to the elastic elastic member extending in the width direction in an extended state.

[0006] Under such a premise, a first feature of the present invention is that a portion of the elastic member located from both side edges of the core to both side edges of the end flap includes the top sheet and the back sheet. And at least one of the inner surfaces is intermittently joined to the inner surface of the core, and the portion of the elastic member located at a portion between the two side edges of the core is formed of the top sheet and the back sheet in the overall width direction. By being continuously joined to at least one inner surface,
The contractile force is in a substantially non-expressed state.

In one embodiment of the present invention, the core has a rigidity value according to the Taber method of 10 to 20 g / cm.
, And the elastic stress of the elastic member located at a portion extending from both side edges of the core to both side edges of the end flap is in a range of 200 to 300 g.

Another example of the embodiment of the present invention is as follows.
The dimension between the opposed edges of the core and the elastic member is 3 to
25 mm.

Under such a premise, a second feature of the present invention is that the core has a rigidity value of 10 to 20 according to the Taber method.
g / cm, and the elastic member is disposed at a portion extending from both side edges of the core to both side edges of the end flap, and is provided on an inner surface of at least one of the top sheet and the back sheet. The elastic member is intermittently joined, and the elastic stress of the elastic member is in a range of 200 to 300 g.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the disposable diaper according to the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 are a partially cutaway perspective view of the disposable diaper 1 in an extended state and a view taken along the line AA of FIG. The diaper 1 is interposed between the liquid-permeable top sheet 2, the liquid-impermeable back sheet 3, and the top sheet 2 and the back sheet 3, and is joined to the inner surface of at least one of the sheets 2 and 3. End flaps 24, which extend from both end edges of the core 4 in the longitudinal direction outward, and are located between both end flaps 24 and extend from both side edges of the core 4 in the width direction. And a side flap 23 extending outward. The diaper 1 has a front waistline region 20, a rear waistline region 22, and a crotch region 21 located between the front and back waistline regions 20, 22 in the longitudinal direction intersecting the width direction. The core 4 has a rigidity value of 10 to 10 according to the Taber method.
It is in the range of 20 g / cm. The end sheet 24 and the side flap 23 are overlapped with each other by the top sheet 2.
And the back sheet 3.

Each of the end flaps 24 located in the front and rear waist regions 20 and 22 of the diaper 1 has a required size, preferably 3 to 25 mm, more preferably 5 to 15 mm outward from both ends 4 b of the core 4. Film-shaped elastic elastic members 5 and 6 extending in the width direction of the diaper 1 along the edge 8 of the end flap 24 are joined to the separated positions in an extended state.

The first portions of the elastic members 5, 6 located at the portion W1 between the side edges 4a of the core 4 are interposed between the top sheet 2 and the back sheet 3, and the inner surfaces of the sheets 2, 3 Are joined continuously over the entire length of the members 5 and 6 in the width direction. The both side edge portions 4a of the core 4 are between a portion having the shortest width dimension of the core 4 located in the crotch region 21 and a longest portion having the width dimension of the core 4 located in the front and rear waist regions 20 and 22. Say.

The elastic members 5 and 6 have substantially no contraction force at the portion W1. Elastic members 5, 6
To make the contraction force of the non-expression substantially, for example,
When bonding the elastic members 5 and 6 using an adhesive, the rigidity of the cured adhesive is used. When joining the elastic members 5 and 6 using the heat fusion means, means for melting the sheets 2 and 3 and the elastic members 5 and 6 with heat, cooling and hardening them, and using the joining means is used.

The second portions of the elastic members 5, 6 located at a portion W2 extending from both side edges 4a of the core 4 to both side edges 7 of the end flap 24 include a top sheet 2 and a back sheet 3.
And are intermittently joined to the inner surfaces of the sheets 2 and 3. The extension stress of the elastic members 5, 6 located at the portion W2 is in the range of 200 to 300 g. The second portions of the elastic members 5 and 6 may be joined to one of the inner surfaces of the sheets 2 and 3. Also, the elastic members 5,
The second portion 6 may be joined to either one of the inner surfaces of the sheets 2 and 3 at only two points at both ends in the length direction (lateral direction) of the second portion.

The size of the diaper 1 in the width direction is 30 to 40 cm
And the dimension in the width direction of the core 4 is 10 to 15 cm.
, The dimension of the portion W1 between the side edges 4a of the core 4 is in the range of 6 to 10 cm,
a from the “a” to the side edges 7 of the end flap 24
Is preferably in the range of 12 to 15 cm. These dimensions can be determined as appropriate for adults or children.

On the side flap 23, a recess 10 is formed in the crotch region 21 of the diaper 1 toward the inside in the width direction of the diaper 1. Is interposed between the top sheet 2 and the back sheet 3 and is joined to the inner surface of at least one of the sheets 2 and 3. For joining these members, a technique of adhesion by a hot melt adhesive, heat sealing by heat sealing or sonic sealing can be used.

At the side edges 7 of the end flap 24 located in the rear waist region 22, the base ends of a pair of tape fasteners 11 extending outward in the width direction of the diaper 1 are provided with the top sheet 2 and the back sheet 3 respectively. Between these sheets 2,
3 is non-peelable. An adhesive is applied to the inner surface of the free end of the tape fastener 11. A tape fastener 1 is provided on the outer surface of the front waist region 20.
A target tape serving as a fixing area of No. 1 is joined (not shown).

FIG. 3 is a perspective view of the diaper 1 in a state left naturally. Gathers 12 are formed on the end edges 8 of both end flaps 24 at portions W2 from both side edges 4a of the core 4 to both side edges 7 of each end flap 24. In a portion W1 between both side edges 4a of the core 4,
Since the contraction force of the elastic members 5 and 6 does not act, no gather is formed and the core 4 does not wrinkle. The elastic members 5 and 6 located at the portion W2 have an expansion stress of 200 to 30 because the expansion stress is hardly hindered by the rigidity of the core 4.
Even at 0 g, the girth of the wearer can be sufficiently tightened when worn. Gathers 13 are formed in the recessed portions 10 of the crotch region 21 by the contraction force of the elastic member 9.

FIGS. 4 and 5 are partially cutaway perspective views of the diaper 1 in a mode different from that of FIG. 1, and FIG.
1 is a perspective view of a diaper 1 of FIG. Diaper 1 front and rear waist circumference area 2
As shown in FIG. 4, each of the end flaps 24, 0, 22 has a width of the diaper 1 along the edge 8 of the front and rear waist regions 20, 22, at a position separated from both end edges of the core 4 by a required dimension. Elastic members 5 and 6 extending in the film direction
Are joined in an extended state. The elastic members 5 and 6 extend from both side edges 4 a of the core 4 to both side edges 7 of the end flap 24.
Are arranged at a portion W2 leading to both sides 4
The elastic members 5 and 6 do not exist in the portion W1 between the positions a. The elastic member has a stretching stress in the range of 200 to 300 g.

In a state where the end flaps 24 are naturally left, the end edges 8 of the both end flaps 24 are provided with a portion W2 extending from both side edges 4a of the core 4 to both side edges 7 of the end flap 24 as shown in FIG. Gathers are formed at the edges. Elastic members 5, 6 are provided in a portion W1 between both side edge portions 4a of the core 4.
Is not arranged, so that no gathers are formed. Since the rigidity at the portion W1 is smaller than that at the portion W2 where the elastic members 5 and 6 are joined, the feeling of wearing in the portion W1 is not impaired.

As the elastic members 5 and 6, it is preferable to use a urethane-based synthetic rubber having a large tensile strength and particularly strong against tearing.

The side flaps 23 can also be formed of a liquid-impermeable sheet extending outward from both sides of the core 4 in the width direction and a back sheet 3 extending outward from both sides of the core 4 in the width direction. By joining the liquid-impervious sheet to the upper surface of the top sheet 2 outside each of the two side edges of the core 4, exudates can be prevented from seeping out of the side flaps 23.

The top sheet 2 is made of a hydrophobic non-woven fabric treated with a hydrophilic agent or a hydrophilic non-woven fabric formed of fibers into which the hydrophilic agent has been kneaded. Instead of these nonwoven fabrics, a thermoplastic synthetic resin film having openings may be used.

The back sheet 3 and the liquid-impermeable sheet include
A synthetic resin film or a laminate sheet of a synthetic resin film and a hydrophobic nonwoven fabric is used. The core 4 is a mixture of fluff pulp and superabsorbent polymer particles, is compressed to a required thickness, and is entirely covered with a liquid-permeable sheet such as tissue paper.

According to the present invention, a stretch-elasticized barrier cuff having a tendency to stand upward from the diaper 1 is provided on the side flap 2.
3 can also be arranged on the upper surface.

[0027]

According to the disposable diaper according to the present invention,
In a portion between both side edges of the core, the contraction force of the elastic member is in a non-expressed state, or since the elastic member is not disposed, the core is wrinkled due to the contraction force of the elastic member in the portion. There is no. When the diaper is worn, there is no gap between both end portions of the core and both end portions of the end flap in a portion between both end portions of the core, and leakage of excrement can be prevented. The diaper, in which the elastic member is not disposed between the two side edges of the core, can be easily bent because the portion is composed of the top sheet and the back sheet, and can be easily adhered to the wearer's skin. Is good.

[Brief description of the drawings]

FIG. 1 is a partially broken perspective view of a disposable diaper in an extended state.

FIG. 2 is a view taken in the direction of arrows AA in FIG. 1;

FIG. 3 is a perspective view of the disposable diaper in a state of being left naturally.

FIG. 4 is a partially cutaway perspective view of the disposable diaper in a different mode from FIG.

FIG. 5 is a perspective view of the disposable diaper of FIG. 4 in a state left naturally.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Liquid-permeable topsheet 3 Liquid-impermeable backsheet 4 Liquid-absorbing core 4a Side edge 4b Edge 5 Elastic elastic member 6 Elastic elastic member 7 Side edge 23 Side flap 24 End flap W1 Part W2 Part

Claims (4)

[Claims] 1. A liquid-permeable topsheet, a liquid-impervious backsheet, and a liquid-absorbent core interposed between these two sheets, and extend outward in the longitudinal direction from both ends of the core. A pair of end flaps, a pair of side flaps located between the end flaps and extending outward in the width direction from both side edges of the core, and at least one of the pair of end flaps A disposable diaper in which the elastically stretchable member extending in the width direction is joined in an extended state, wherein the portion of the elastic member located at a portion from both side edges of the core to both side edges of the end flap includes: The portion of the elastic member that is intermittently joined to at least one inner surface of the top sheet and the back sheet, and that is located at a portion between both side edges of the core, is a width direction. By being continuously joined to at least one of the inner surface of the length between the top sheet and the back sheet, the diaper shrinkage force is equal to or substantially in a non-expression state. 2. The rigidity value of the core according to the Taber method is:
2. The elastic member according to claim 1, wherein the elastic member is located in a range from 10 to 20 g / cm and extends from both side edges of the core to both side edges of the end flap. 2. Diapers. 3. The dimension between the opposing edges of the core and the elastic member is 3 to 25 mm.
The diaper described. 4. A liquid-permeable topsheet, a liquid-impervious backsheet, and a liquid-absorbent core interposed between these two sheets, and extend outward in the longitudinal direction from each of both ends of the core. A pair of end flaps, a pair of side flaps located between the end flaps and extending outward in the width direction from both side edges of the core, and at least one of the pair of end flaps A disposable diaper in which the elastic elastic member extending in the width direction is joined in an extended state, wherein the core has a rigidity value of 10 to 20 g / by a Taber method.
cm, the elastic member is disposed at a portion extending from both side edges of the core to both side edges of the end flap, and is intermittently provided on an inner surface of at least one of the top sheet and the back sheet. The diaper, wherein the elastic member has a stretching stress in a range of 200 to 300 g.