JP2603258Y2 - Disposable diapers - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to disposable diapers.

[0002]

2. Description of the Related Art Conventionally, there is a technique of providing a flap around a leg of a disposable diaper in order to prevent body fluid leakage from around the leg of the disposable diaper. In addition, there is a technique for enclosing a liquid-absorbent core in a flap in order to enhance its prevention effect. This invention targets the latter technology.

[0003]

In the prior art, in order to further enhance the effect of preventing leakage around the legs, the amount of the liquid-absorbent core material, for example, pulverized pulp, should be increased to increase the liquid absorption. However, this makes the flaps thicker,
In the inner crotch, there is a problem that the diaper is bulky because the respective absorbent cores of the flap and the diaper main body occupy the space between the narrow legs (ie, the inseam portion), and the wearing feeling is significantly impaired.
In addition, there is a problem that the flap hinders the liquid-absorbent core of the main body from coming into close contact with the local portion, and it becomes difficult to quickly absorb the discharged body fluid near the local portion.

Therefore, the present invention solves the above-mentioned problem by using a liquid-absorbing core having excellent liquid-absorbing diffusivity for the flaps around the legs so as to exhibit high liquid-absorbing performance even when the flap is thin. That is the task.

[0005]

According to the present invention, a liquid-absorbing first core is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and each of the first cores has an outer side. Each of the first flaps extends, and each of the first flaps is provided with a respective first elastic member that expands and contracts in the longitudinal direction thereof. Each of the first flaps has a side edge of the first core and a side edge of the first flap. There is an improvement in the disposable diaper in which the base edge of each second flap is located and the second elastic member of the second flap is attached to the free edge of each second flap in the longitudinal direction thereof. This idea for improvement is
In each of the second flaps, a liquid-absorbing second core is interposed between a liquid-permeable inner sheet and a liquid-impermeable outer sheet;
The core is thinner than the first core and at a time
And the second flaps are fixed at both ends in the vertical direction of the second flaps in a state where the second flaps are laid outside and on the first flaps. Each of the second flap portions has a tendency to rise upward due to the contraction of each of the second elastic members.

[0006]

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.

FIG. 1 shows a disposable diaper 1 according to the present invention.
3 is a plan view of FIG. In the diaper 1, a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a liquid-absorbing first core 4 are interposed between these two sheets 2, 3, and a leg peripheral side edge 9 and a rear body end are provided. Elastic rubber threads 11 and 12 are attached to the edge 10, and one end of a tape fastener 13 is attached to both side edges of the back body. A second flap 7 is attached to the upper surface of the topsheet 2.

FIG. 2 is a sectional view taken along the line II-II in FIG.
Is slightly raised from the topsheet 2 due to contraction. The front and back sheets 2 and 3 are the first core 4
And joined to each other by an adhesive (not shown), and a first flap 15 is formed at the extended portion.
The second flap 7 provided on the top sheet 2 in the first flap 15 absorbs liquid between the liquid-permeable inner sheet 16 facing the inside of the diaper 1 and the liquid-impermeable outer sheet 17 facing the outside. With the second core 20 interposed between the two sheets 16,
17 are formed on both sides of the second core 20 by bonding with an adhesive (not shown). One of the joined side edges 21 is joined to the topsheet 2 by a hot melt adhesive 27 adjacent to the side edge 6 of the first core 4. On the other side edge 22, the inner and outer sheets 16, 1
A stretchable rubber thread 23 is stuck between stretches 7 so that the second flap 7 has stretchability, and floats from the topsheet 2 as shown in FIG. 2 when the diaper 1 is worn. The second flap 7 has an edge 25
At 26, a portion lying down in the outward direction and indicated by oblique lines is joined to the topsheet 2, and both ends of the rubber thread 23 are fixed to the topsheet 2 by this joining (see FIG. 1).

The second core 20 extends substantially the entire length of the second 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, preferably 1/4 to 3/4 of the thickness T so as not to hinder wearing. The first core 4 has a liquid absorbing and diffusing property per unit time.
Higher.

The second core 20 having a high liquid-absorbing and diffusing property may be made of a fiber material such as rayon fiber or thermoplastic synthetic fiber alone or a suitable amount of the superabsorbent polymer 3 in addition to the pulverized pulp 35.
6 and then compression-molding these materials to make them denser than the first core 4.
Although the same material as the first core 4 can be used for the second core 20, the second core 20 is also compressed to have a higher density than the first core 4. The compression is performed under a wet state or a heated state as necessary, and preferably, the density of the second core 20 is set in a range of 0.05 to 0.5 g / cm ³ . In the second core 20, which has a high liquid absorption and diffusion property, the absorbed bodily fluid is quickly diffused, and if there is a portion of the core 20 that is not in contact with the bodily fluid, it is possible to spread to that part. Therefore, the second
Comparing the liquid absorption diffusivity per unit time of a 20 with a core having a lower liquid absorption diffusivity , the second core 20 has a higher liquid absorption speed,
The liquid-absorbing property that the liquid-absorbing amount is large is exhibited.

As shown in FIG. 2, the second flap 7 is attached to the side edge 6 of the first core 4 so as to form a V-shaped groove 28. When the bodily fluid flows in the diaper width direction without being absorbed by the first core 4, the bodily fluid is once dammed and stagnated, 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 tends to flow out over the second flap 7 is reduced, and the possibility of leakage from around the leg is reduced accordingly.

In the diaper 1, the outer surfaces of the front and back sheets 2 and 3 are closely joined on the outer periphery. In this embodiment including this joining, an adhesive such as a hot-melt adhesive or a technique of thermally fusing a thermoplastic synthetic resin material can be used. The same material can be used for the liquid-permeable top sheet 2 and the inner sheet 16 and the hydrophilicity of the two sheets 2 and 16 can be different. And a perforated plastic sheet are preferred. 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 pulverized pulp, rayon fiber, thermoplastic synthetic fiber or the like may be used alone, or a mixture of this material and a superabsorbent polymer may be used if necessary. Can be.

[0013]

In the diaper according to the present invention, the second flap is provided with a second core which is thinner than the first core and has a high liquid absorption and diffusion property per unit time. Fluid body fluid can be quickly absorbed and diffused to prevent leakage from around the leg.

Since the second flap is folded down on the first flap, when the diaper is worn, the first flap causes the second flap to press against the wearer's skin by the contraction of the first elastic member. The leak prevention is more effective.

[Brief description of the 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 a leg-around flap standing up;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Top sheet 3 Back sheet 4 1st core 7 2nd flap 11 1st elastic member 15 1st flap 16 Inner sheet 17 Outer sheet 20 2nd core 23 2nd elastic member

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-291858 (JP, A) JP-A-3-1888851 (JP, A) JP-A-4-58231 (JP, U) JP-A-2-58 96120 (JP, U)

Claims (1)

(57) [Scope of request for utility model registration] 1. A liquid-absorbing first core is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and each first flap extends outward from each side edge of the first core. And each first flap is provided with a respective first elastic member which expands and contracts in a longitudinal direction thereof, and a second flap is provided between each side edge of the first core and the side edge of each first flap. Each of the second flaps having a base edge located at a free edge of the second flap and extending and contracting in the longitudinal direction thereof.
In the disposable diaper to which an elastic member is attached, in each of the second flaps, a liquid-absorbing second core is interposed between a liquid-permeable inner sheet and a liquid-impermeable outer sheet;
The core is thinner than the first core and at a time
Is highly liquid-absorbent diffusivity of the respective second flaps, longitudinal both end portions of each of the second flaps are secured in a state of being tilted outwardly and the on each first flap, said between said end portions The said diaper, wherein each second flap portion has a tendency to rise upward due to the contraction of each second elastic member.