JPH09253126A - Disposable diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable diaper capable of effectively preventing the leakage of urine and soft stool from the crotch, and ensuring freedom from a feeling of physical disorder such as tightening a user's thigh root and giving a pain. SOLUTION: Regarding a disposable diaper formed out of a liquid permeable surface sheet 1, a liquid impermeable lining sheet 2, an absorptive body 3 laid between both sheets 1 and 2, side flaps 4 externally extended from both lengthwise ends of the absorptive body 3, and the second side flaps 7 branched from the side flaps 4 and erected vertically, and fitted with stretch and elastic members 6 on the side flaps 4 and the second side flaps 7 along a lengthwise direction, the tensile stress of the second side flaps 7 of the diaper is within the range of 30 to 180mN, and the water resistance pressure of a sheet forming the second side flaps 7 is equal to 80mmH2 O or more.

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 in preventing urine leakage from the crotch, loose stool leakage, etc., and does not tighten the thigh root of the wearer, and thus causes discomfort such as pain. Regarding disposable diapers that do not give.

[0002]

2. Description of the Related Art A disposable diaper has a structure in which a hydrophilic sheet, a cotton-like pulp, and an absorbent body made of a super absorbent polymer are arranged between a liquid-permeable top sheet and a liquid-impermeable back sheet. ing. In recent years, since the super absorbent polymer has been used in the absorbent body of disposable diapers, it has become extremely effective in leaking and returning of urine and the like. However, since the super absorbent polymer has an extremely slow urine absorption rate as compared with cotton-like pulp, when a large amount of urine or loose feces is discharged, it may temporarily leak. Therefore, even in such a case, it is necessary to take measures to prevent leakage of urine and loose stool.

In order to solve these problems, it has been proposed to arrange a flap on the outside of the absorbent body. For example, as described in Japanese Examined Patent Publication No. 6-93901, a double flap including an elastic elastic member is provided on the outer side of the absorber, and the inner flap is arranged so as to be tilted toward the absorber.
BACKGROUND ART A disposable diaper is known in which a pocket is formed between the absorbent body and a surface sheet to prevent leakage. But,
The desired effect cannot be obtained if the tensile stress of the elastic elastic member is not appropriate simply by disposing the flap. If the tensile stress of the stretchable elastic member is too weak, the flap does not rise when mounted. Or even when standing up, a gap is created between the wearer and the thigh root, and as a result, the flap does not serve as a leak-proof wall and urine and loose stools leak. In addition, if it is too strong, there is a problem that the thigh base of the wearer is strongly tightened to leave a tightening mark, and further, discomfort such as pain is given.

Further, in Japanese Patent Laid-Open No. 4-218159, there are first and second flaps on which elastic elastic members are arranged, on both sides of the absorber, and the tensile stress of the second flap is adjusted by the first flap. It has been proposed that the free edge of the second flap be stably pressure-bonded to the base of the thigh even when the body moves to prevent excrement from leaking by making it weaker than the tensile stress. However, also in this case, the tensile stress of the second flap tends to be weak, the second flap does not stand up, a gap is formed in the thigh root of the wearer, and the role of the leak preventive wall cannot be fulfilled.

[0005]

According to the present invention, a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorber disposed between these sheets, and both longitudinal edges of the absorber are provided. It has a side flap that extends outward and a second side flap that branches from the side flap and stands upright,
In the disposable diaper in which the elastic elastic members are arranged along the longitudinal direction in the side flaps and the second side flaps, the tensile stress of the second side flaps in which the elastic elastic members are arranged is in the range of 30 to 180 mN, The sheet forming the second side flap has a water pressure resistance of 80.
The disposable diaper is characterized by having a size of mmH ₂ O or more.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The disposable diaper of the present invention will be described below with reference to the drawings, but the present invention is not limited thereto.

FIG. 1 is a perspective view showing a state in which the disposable diaper of the present invention is developed. In FIG. 1, the disposable diaper has side flaps 4 extending outward from both side edges of the absorbent body 3, and second side flaps 7 standing upward are formed along both side edges of the absorbent body 3. ing. A side flap elastic elastic member 6 is arranged in the crotch region of the side flap 4, and fastener fasteners 9 for fastening are attached to both side edges of the side flap 4 on the rear body side. FIG. 2 shows the disposable diaper of FIG.
The figure cut along the X'line is shown. In FIG. 2, the disposable diaper has an absorbent body 3 disposed between a liquid-permeable topsheet 1 and a liquid-impermeable backsheet 2, and a backsheet 2 extending from both side edges of the absorbent body 3. The side flap 4 is formed by a side sheet 5 which is a separate body from the top sheet laminated on the back sheet 2.
A side flap elastic elastic member 6 is disposed between the side seat 5 and the side seat 5. In addition, a portion of the side seat 5 located on the absorber 3 is bent so that its side edge surrounds the elastic member 8, and a second side flap 7 that stands up is formed.

As the topsheet 1, a liquid-permeable nonwoven fabric made of polyester, polypropylene or the like, a woven fabric, a porous plastic film, a porous foam or the like is used.
Further, natural fibers (for example, wood fibers, cotton fibers, etc.) may be used, and they can be produced from a wide range of materials such as a combination of synthetic fibers and natural fibers. In any case, since the surface sheet is a portion that directly contacts the skin, it may be soft and comfortable to the touch.

The back sheet 2 is made of a liquid-impermeable film such as polyethylene, a liquid-impermeable film to which a nonwoven fabric or a woven fabric is attached, or a leak-proof nonwoven fabric or a woven fabric. There is no particular limitation, as long as the moisture of the absorber does not exude to the outside of the diaper. When a film is used, a known breathable film that is liquid impermeable but allows only water vapor to pass may be used, which is more preferable because it prevents stuffiness.

The absorber 3 includes a top sheet 1 and a back sheet 2.
Sandwiched between, mainly composed of cotton-like pulp, a super absorbent polymer, but is not particularly limited, it may be a water absorbent sponge, a water absorbent sheet, as long as it has a water-absorbing ability. good. The flocculent pulp in the present invention is a sheet of chemical pulp, mechanical pulp, chemical mechanical pulp, or waste paper pulp, which is flocculated with a crusher. The pulp material is not limited to softwood, but hardwood, straw, bamboo, bagasse and the like are also applicable. Further, synthetic fibers, heat-sealing components, adhesives, etc. may be contained together with the cotton-like pulp.

As the super absorbent polymer, starch polymers, acrylic acid polymers, cellulose polymers, etc. having a weight of 5 can be used.
It is possible to use one that absorbs 0 times or more of water,
A polyacrylic acid type such as sodium polyacrylate is most preferable from the viewpoint of absorption performance. Also, the shape is
There is no particular limitation such as a fibrous shape, a granular shape, or a sheet shape. The absorbent body may be a mixture of a super absorbent polymer and cotton-like pulp, or may be a laminate of the cotton pulp and the super absorbent polymer.

The side flap 4 may be constructed by laminating the top sheet 1 and the back sheet 2 or may be constructed by laminating the side sheet 5 which is separate from the top sheet 1. In this case, the surface sheet 1 placed on the absorbent body 3 is preferably hydrophilic so that urine can quickly pass therethrough, and the side sheet 5 is water repellent so as to prevent the urine from seeping out from the absorbent body. It is preferable.

Further, the side flap portion elastic members 6 arranged in the side flaps 4 may be arranged linearly along the longitudinal direction of the diaper, or in accordance with the leg leg.
Although it may be arranged in a curved shape, since the side flap elastic elastic member 6 is curved, a pocket is formed between the side flap portion elastic member 6 and the second side flap 7 and leakage can be prevented, so preferable. Further, it is also preferable from the viewpoint of fit.

A second side flap elastic elastic member 8 is disposed on the second side flap 7 which branches off from the side flap 4 and stands up. The tensile stress of the second side flap 7 is 30 to 180 mN, More preferably 60
It is in the range of mN to 110 mN. When the tensile stress is less than 30 mN, it becomes difficult for the second side flap 7 to fit the crotch according to the movement of the wearer, and a gap is created, or particularly, the second flap is crushed by stool or the like, Urine and stool leak out. On the other hand, when the tensile stress exceeds 180 mN and becomes large, the effect as the leak preventive wall becomes high, but the root of the thigh of the wearer is tightened too much, which is unfavorable to the wearer.

The second side flap 7 is made of a material having a water pressure resistance of 80 mmH ₂ O or more, more preferably 160 mm.
As long as the material is H ₂ O or more, the side sheet 5 may be used, or another material may be used. Or,
The liquid-permeable topsheet 1 may be formed of a material having water resistance adjusted to 80 mmH ₂ O or more, for example, by combining another material on both ends. When the water pressure resistance of the second side flaps 7 is less than 80 mmH ₂ O, urine and loose stools easily pass through the second side flaps 7 and it becomes impossible to substantially function as a leak preventive wall. Further, it may be liquid impermeable, but in that case, a material that is breathable and can prevent stuffiness is preferable. Specifically, a non-woven fabric composed of ultrafine fibers is suitable. For example, a thermoplastic resin is melted and extruded through a nozzle hole of an extrusion spinning machine, and at the same time, the molten resin is thinned to form ultrafine fibers, and the obtained fiber group is collected and accumulated on a collecting support to form a non-woven fabric. In order to obtain a long-fiber non-woven fabric composed of a non-woven fabric manufactured by the melt blown method (hereinafter referred to as MB non-woven fabric) and a continuous long fiber, a continuous long fiber obtained by melt-spinning a thermoplastic resin from a spinneret is pulled by a high-speed airflow traction device. A sheet formed of a plurality of non-woven fabrics such as a non-woven fabric (hereinafter referred to as an SB non-woven fabric) manufactured by a spunbonding method in which the non-woven fabric is thinned and stretched, deposited on an endless wire mesh conveyor, and thermocompression bonded is also applicable. Specific examples thereof include a composite sheet having a three-layer structure in which an MB non-woven fabric is sandwiched between SB non-woven fabrics, a sheet in which the MB non-woven fabric and the SB non-woven fabric are hydroentangled, simply laminated, or subjected to a water jet treatment after lamination.

Further, the second side flap 7 may be tilted inward from the branch point with the side flap 4 and fixed to the diaper surface, or may be tilted outward and fixed to the diaper surface. Alternatively, it may be fixed to the surface of the diaper by, for example, once tilting it to the outside and then folding it back and then to the inside, or tilting it inward and then folding it back and then to the outside.

As the stretchable elastic member, a thread-shaped, string-shaped or flat-shaped member made of natural rubber, synthetic rubber, urethane or the like is used depending on the position.

[0018]

EXAMPLES Hereinafter, the disposable diaper of the present invention will be described in more detail with reference to examples. In each of the examples and comparative examples, the tensile stress and the water pressure resistance were measured as follows.

Measurement method (1) Tensile stress A sample was cut into a length of 150 mm or more without tension applied to the second side flap on which an elastic elastic member was arranged, and a span of 80 mm and a pulling speed of 200 mm / min.
Under a full scale 1N condition, a tensile tester (manufactured by Toyo Seiki Seisakusho Ltd., Strograph V1-B) was used to pull the sample piece, and the stress in the state where the gather was fully extended was measured. (2) Water pressure resistance JIS using a sheet forming the second side flap
L1092 5.1.1. It was measured by a water pressure resistance tester (manufactured by Sagawa Seisakusho) according to the method A.

[0020]

Example 1 As a sheet for forming the second side flap portion, S having a basis weight of 25 g / m ² and a water pressure resistance of 200 mmH ₂ O was used.
Using a self-made composite sheet of B non-woven fabric and MB non-woven fabric, and arranging two 560 denier thread rubbers stretched to 260% to form a second side flap with a tensile stress of 75 mN, the disposable diaper shown in FIG. Was produced.

[0021]

[Example 2] As a sheet for forming the second side flap portion, S having a basis weight of 25 g / m ² and a water pressure resistance of 200 mmH ₂ O was used.
A disposable diaper shown in FIG. 1 is formed by using a self-made composite sheet of B non-woven fabric and MB non-woven fabric, and arranging one thread rubber of 560 denier stretched to 350% to form a second side flap having a tensile stress of 35 mN. Was produced.

[0022]

Example 3 A self-made SB non-woven fabric having a basis weight of 25 g / m ² and a water pressure resistance of 80 mmH ₂ O was used as a sheet forming the second side flap portion, and ^two 560 denier thread rubbers were expanded to 260%. Second, with a tensile stress of 75 mN
The side flap was formed, and the disposable diaper shown in FIG. 1 was produced.

[0023]

[Embodiment 4] A sheet having a basis weight of 25 g / m ² and a water pressure resistance of 200 mmH ₂ O was used as a sheet for forming the second side flap portion.
Using a self-made composite sheet of B non-woven fabric and MB non-woven fabric, and arranging two 840 denier thread rubbers stretched to 400% to form a second side flap with a tensile stress of 180 mN, the disposable diaper shown in FIG. Was produced.

[0024]

Comparative Example 1 A self-made SB non-woven fabric having a basis weight of 12 g / m ² and a water pressure resistance of 40 mmH ₂ O was used as a sheet for forming the second side flap portion, and one 560 denier rubber thread was stretched to 200%. Second, with a tensile stress of 25 mN
The side flap was formed, and the disposable diaper shown in FIG. 1 was produced.

[0025]

[Comparative Example 2] A sheet having a basis weight of 25 g / m ² and a water pressure resistance of 200 mmH ₂ O was used as a sheet for forming the second side flap portion.
A disposable diaper shown in FIG. 1 is formed by using a self-made composite sheet of B non-woven fabric and MB non-woven fabric, and arranging one thread rubber of 560 denier stretched to 200% to form a second side flap having a tensile stress of 25 mN. Was produced.

Comparative Example 3 A self-made SB non-woven fabric having a basis weight of 12 g / m ² and a water pressure resistance of 40 mmH ₂ O was used as a sheet for forming the second side flap portion, and ^two 560 denier thread rubbers were expanded to 260%. Second, with a tensile stress of 25 mN
The side flap was formed, and the disposable diaper shown in FIG. 1 was produced.

[Comparative Example 4] A sheet having a basis weight of 25 g / m ² and a water pressure resistance of 200 mmH ₂ O was used as a sheet forming the second side flap portion.
Using a composite sheet of B non-woven fabric and MB non-woven fabric,
3 thread rubbers of 0 denier are stretched to 400% and placed,
A second side flap having a tensile stress of 25 mN was formed to produce the disposable diaper shown in FIG.

In each of the examples and the comparative examples, using the produced disposable diapers, a urine leak test, a loose stool leak test,
And a tightening test was performed. The test method is as follows. Moreover, the baby doll shown in FIG. 3 was used for the test. In FIG. 3, small holes connected to the abdominal pipe 10 and the dorsal pipe 11 are arranged on the crotch side and the back side of the crotch of the baby doll, respectively. The abdominal pipe 10 is for injecting artificial urine when performing a urine leak test, and the dorsal pipe 11 is for injecting artificial loose stool when performing a soft stool leak test.

Test Method (1) Urine Leakage Test A baby doll is put on a sample diaper and the legs are opened and closed 50 times, and then 50 ml of artificial urine is added at 7 ml / sec.
At the same speed and left for 30 minutes. Repeat the same work until the artificial urine leaks from the crotch of the doll and measure the amount of absorption until the leak. There is no practical problem if the absorption amount up to leakage is 300 ml or more. Artificial urine composition (% indicates% by weight) Urea 1.9% NaCl 0.8% CaCl ₂ 0.1% MgSO ₄ 0.1% Pure water 97.1% (2) Soft stool leak test Samples for baby dolls After putting on the diaper and opening and closing the legs 50 times, 80 ml of artificial loose stool (3000 cp)
s) is injected at a rate of 5 ml / sec. The same operation was repeated until the artificial loose stool leaked from the crotch of the doll, and the injection amount until the leak was measured. There is no practical problem if the injection amount up to leakage is 150 ml or more. Artificial loose stool composition (% means% by weight) Bentonite 11.1% Pure water 88.9% (3) Tightening test Samples are applied to 10 babies aged 15 to 21 months, and diapers are taken 40 minutes later. It was removed, and the presence or absence of a tightening mark was visually evaluated.

The results obtained in Examples 1 to 4 and Comparative Examples 1 to 4 are shown in Table 1. As can be seen from Table 1, Examples 1 to 1
It was confirmed that the disposable diaper of the present invention of No. 4 exerts an excellent effect on urine leakage and loose stool leakage as compared with the disposable diapers of Comparative Examples 1 to 4.

[0029]

[Table 1]

[0030]

As described above, the present invention is effective in preventing urine leakage from the crotch, loose stool leakage, etc., and does not tighten the thigh base of the wearer, and thus causes discomfort such as pain. It has become possible to provide a disposable diaper without giving.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state in which a disposable diaper of the present invention is developed.

FIG. 2 is a cross-sectional view of the disposable diaper of the present invention taken along line XX ′.

FIG. 3 is a perspective view of a baby doll used for a urine leak test and a loose stool leak test.

[Explanation of symbols]

 1. Liquid permeable top sheet 2. Liquid impermeable back sheet 3. Absorber 4. Side flaps 5 Side seats 6. Side flap part elastic member 7. Second side flap 8. Second side flap portion elastic member 9. Fastening fastener tape 10. Ventral pipe 11. Dorsal pipe

Claims (1)

[Claims] 1. A liquid-permeable topsheet and a liquid-impermeable backing.
A face sheet and an absorber arranged between these sheets,
Side flares extending outward from both longitudinal edges of the absorber
Up from the side flap and stand up
2 side flaps, side flap and 2nd support
Elastic elastic members are arranged along the longitudinal direction on the id flap.
In a disposable diaper that is used, the pulling of the second side flap, on which the elastic member is arranged, is performed.
The tensile stress is in the range of 30 to 180 mN,
The water pressure resistance of the sheet forming the wrap is 80mmH _TwoO or higher
Disposable diaper characterized by being