JPH0617724U - Disposable diapers - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent fluid leakage around the legs of disposable diapers. [Structure] thinner than the first core 4 of the diaper body, and
Disposable diaper 1 is configured by providing leg flaps 7 having a second core 20 having a high liquid absorption property of at least one of liquid absorption amount per unit surface area and liquid diffusion property on both sides of the diaper body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a disposable diaper.

[0002]

[Prior art]

 Conventionally, there is a technique of providing a flap around the legs of a diaper in order to prevent body fluid from leaking around the legs of the disposable diaper. In addition, in order to enhance the prevention effect, there is a technique in which the liquid-absorbent core is included in the flap. This device targets the latter technology.

[0003]

[Problems to be solved by the device]

 In order to further enhance the leakage prevention effect around the legs by the conventional technique, the amount of the absorbent core material, for example, crushed pulp, should be increased to increase the liquid absorption. However, in this case, the flap becomes thick, and in the inner crotch, the absorbent cores of the flap and the diaper body occupy the narrow space between both legs (that is, the crotch region), and the diaper becomes bulky, which significantly impairs the wearing comfort. Get up. There is also a problem in that the flap obstructs the absorbent core of the main body so that it does not adhere to the local area, making it difficult to quickly absorb the discharged body fluid near the local area.

In view of this, the present invention solves the above problem by using a liquid-absorbent core having excellent liquid-absorption and diffusivity in the flaps around the legs so as to exhibit high liquid-absorbing performance even if the flap is thin. It is an issue.

[0005]

[Means for Solving the Problems]

 The gist of the present invention to solve the above-mentioned problems is to construct a diaper body with a liquid-absorbent first core interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet. Assuming a disposable diaper in which a liquid-permeable inner sheet and a liquid-impermeable outer sheet are provided on both sides of the main body and leg flaps around which a liquid-absorbing second core is interposed are provided. Is thinner than the first core, and at least one of the liquid absorption amount per unit surface area and the liquid absorption diffusivity is high.

[0006]

[Action]

 In the diaper according to the present invention, since the second core is thinner than the first core, the wearing feeling is not impaired, and the first core is less likely to interfere with the local contact. The thin second core has at least one of the amount of liquid absorption and the amount of liquid diffusivity per unit surface area higher than that of the first core, so that most of the body fluid that attempts to flow out beyond the leg flaps is discharged. It absorbs and diffuses it quickly, preventing fluid leakage from the flaps around the legs.

[0007]

【Example】

 The details of the disposable diaper according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a plan view of a disposable diaper 1 according to the present invention, a part of which is cut away. In the diaper 1, in the diaper body composed of the liquid-permeable top sheet 2, the liquid-impermeable back sheet 3, and the liquid-absorbing first core 4 interposed between these sheets 2 and 3, the leg side Elastic rubber threads 11 and 12 are attached to the edge 9 and the edge 10 of the rear body, and one end of a tape fastener 13 is attached to both side edges of the rear body. Leg flaps 7 are attached to the upper surface of the surface sheet 2.

FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, but the leg flap 7 is shown in a state of being slightly lifted from the topsheet 2 due to contraction of a rubber thread 23 described later. The front and back sheets 2 and 3 extend from the side edges of the first core 4 and are joined to each other with an adhesive (not shown), and a flap 15 is formed at this extending portion. In this flap 15, the leg flaps 7 provided on the surface sheet 2 have a liquid absorbing property between the liquid permeable inner surface sheet 16 facing the inner side of the diaper 1 and the liquid impermeable outer surface sheet 17 facing the outer side. The second core 20 is interposed, and the side edges of both sheets 16 and 17 are joined on both sides of the second core 20 by an adhesive (not shown). One of the joined side edges 21 is adjacent to the side edge 6 of the first core 4 and is joined to the topsheet 2 with a hot melt adhesive 27. On the other side edge 22, a stretchable rubber thread 23 is stretched and attached between the inner and outer sheets 16 and 17 so that the leg flaps 7 have stretchability, and when the diaper 1 is worn. It is made to rise from the surface sheet 2 like 2. The leg flaps 7 lie outward at their edges 25, 26 and join the portions shown by the diagonal lines to the topsheet 2, and by this joining, both ends of the rubber thread 23 are fixed to the topsheet 2. Yes (see Figure 1).

The second core 20 extends over substantially the entire length of the leg flap 7 except for the vicinity of the edges 25 and 26. The thickness t of the second core 20 is smaller than the thickness T of the first core 4, and preferably 1/4 to 3/4 of the thickness T so as not to be an obstacle during wearing. The core 20 has the liquid absorption property of at least one of the liquid absorption amount per unit surface area and the liquid absorption / diffusivity higher than that of the first core 4.

The second core 20 having a high liquid absorption amount per unit surface area is a mixture of the super absorbent polymer 36 and the crushed pulp 35, or the mixture of the super absorbent polymer 36, the crushed pulp 35 and a fiber material such as rayon fiber. Can be obtained by The amount of liquid absorption is adjusted mainly by the amount of the super absorbent polymer 36 mixed, and is preferably 1.1 to 5.0 times the amount of liquid absorption of the first core 4.

The second core 20 having a high liquid absorbing and diffusing property, in addition to the crushed pulp 35, a fiber material such as rayon fiber or thermoplastic synthetic fiber alone or mixed with an appropriate amount of the super absorbent polymer 36, Further, it can be obtained by subjecting these materials to compression molding so as to have a higher density than the first core 4. The same material as that of the first core 4 can be used for the second core 20, but the second core 20 is also compressed at this time to have a higher density than the first core 4. The compression is performed under a wet condition or a heated condition, if necessary, and preferably the density of the second core 20 is set in the range of 0.05 to 0.5 g / cm ³ . The absorbed body fluid quickly diffuses in the second core 20 having a high fluid-diffusive property, and if there is a portion of the core 20 that is not in contact with the body fluid, it can be spread there. Therefore, when the second core 20 is compared with a core having a low liquid absorption and diffusion property under a constant liquid absorption time, the second core 20 exhibits a liquid absorption characteristic that the liquid absorption speed is high and the liquid absorption amount is large. It will be. On the other hand, with the second core 20 having a high liquid absorption amount per unit surface area, even if the liquid absorption amount of the first core 4 reaches a saturated state around the legs, it is expected that the second core 20 still absorbs a large amount of liquid. You can

As shown in FIG. 2, the leg flap 7 is adjacent to the side edge 6 of the first core 4 and attached so as to form a V-shaped groove 28. When the body fluid is not absorbed by the first core 4 and flows in the width direction of the diaper, it is temporarily stopped here and stagnates, and is absorbed by the first core 4 and the second core 20 during that time. As a result, the amount of bodily fluid that attempts to flow out beyond the leg flaps 7 is reduced, and the possibility of leakage from around the legs is reduced accordingly.

FIG. 3 is a sectional view showing an aspect of the leg flap 7 different from that of FIG. The second core 20 is interposed between the front and back sheets 2 and 3 extending from the side edge 6 of the first core 4, and the rubber thread 30 is attached to both sides or one side of the second core 20. is there. In this structure, the front and back sheets 2 and 3 also serve as the inner and outer sheets 16 and 17, respectively, and since it is not necessary to join the flaps 17 around the legs to the flap 15, it does not take time and effort to manufacture the diaper.

In the diaper 1, the outer peripheries of the front and back sheets 2 and 3 are closely joined. For joining in this embodiment, including this joining, a technique of heat-sealing an adhesive such as a hot-melt adhesive or a thermoplastic thermoplastic resin material can be used. It is possible to use the same material for the liquid-permeable surface sheet 2 and the inner sheet 16, and it is also possible to make the hydrophilicity of both sheets 2, 16 different. Is preferably a non-woven fabric or a perforated plastic sheet. It is also possible to use the same material for the liquid-impermeable back sheet 3 and the outer sheet 17, and a plastic sheet is suitable for this. For the first core 4, a fiber material such as crushed pulp, rayon fiber, or thermoplastic synthetic fiber is used alone, or this material and a super absorbent polymer are mixed and shaped as necessary, and used. be able to.

[0016]

[Effect of device]

 In the diaper according to the present invention, the leg flap is provided with the second core that is thinner than the first core and has a high liquid absorption property of at least one of the liquid absorption amount per unit surface area and the liquid diffusion property. The body fluid can be quickly absorbed and diffused around the legs to prevent leakage from around the legs without disturbing the wearing feeling and the close contact of the first core to the local area.

[Brief description of drawings]

FIG. 1 is a plan view of a diaper according to the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 1, showing the leg flaps in a raised state.

FIG. 3 is a cross-sectional view showing a leg flap in a mode different from that of FIG.

[Explanation of symbols]

 1 Disposable Diapers 2 Top Sheet 3 Back Sheet 4 First Core 7 Leg Flap 16 Inner Sheet 17 Outer Sheet 20 Second Core

Claims (1)

[Scope of utility model registration request] 1. A diaper body is constructed by interposing a liquid-absorbing first core between a liquid-permeable top sheet and a liquid-impermeable back sheet, and a liquid-permeable inner sheet and an impermeable body are provided on both sides of the body. A disposable diaper having leg flaps with a liquid absorbing second core interposed between the liquid outer sheet, the second core being thinner than the first core, and liquid absorbing per unit surface area. The diaper is characterized in that at least one of the amount and the liquid diffusivity has a high liquid absorbing property.