JPH1133056A - Disposable training pants for infant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide disposable training pants for infants, providing strong discomfort to the wearer. SOLUTION: The water-absorbing core 4 of training pants for infants comprises an urine absorber 23, which consists at least of 100 to 450 g/m<2> highly water absorbent polymer particles 21 and 10 to 100 g/m<2> thermoplastic synthetic fibers 22, and a liquid-permeable sheet of wrapping material 24 wrapping the urine absorber 23. The urine absorber 23 is not bound by either an adhesive or sticky agent to the inner surface of the wrapping material 24 but is kept movable within the wrapping material 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to disposable infant training pants.

[0002]

2. Description of the Related Art JP-A-5-59601 and JP-A-5-59601.
The training pants disclosed in JP-A-59602 have a wet holding sheet on the upper surface of the central area of the liquid-permeable inner sheet that covers the liquid-absorbing core. Most of urine is absorbed by the moisturizing sheet, and this sheet can give an unpleasant wet feeling by coming into contact with the wearer's skin. One example of a wet retention sheet is a nonwoven fabric.

[0003]

In the known training pants, the absorption capacity of the moisturizing sheet cannot be increased so much that the urine from the moisturizing sheet to the liquid-absorbent core with the passage of time after urination. A transition can occur. Also, even when the migration does not occur, the wet holding sheet may gradually dry.

[0004] In any case, the discomfort to be given to the wearer by the moisturizing sheet changes in a direction in which the discomfort becomes slight.
Such changes are not desirable in training pants.

[0005] It is an object of the present invention to provide training pants that can maintain the discomfort given to a wearer for a long time.

[0006]

In order to solve the above-mentioned problems, the gist of the present invention is to provide a liquid-permeable top sheet and a liquid-impermeable back sheet with a liquid-absorbent core interposed therebetween. A training disposable pants for infants, wherein the absorbent core comprises at least 100 to 450 g / m ² of superabsorbent polymer particles and 10 to 100 g / m ² of a thermoplastic synthetic fiber. A liquid-permeable sheet-like wrapping material surrounding the urine absorbing material, wherein the urine absorbing material is not restrained by any of an adhesive and an adhesive on the inner surface of the wrapping material, Characterized by being movable in the wrapping material.

In a preferred embodiment of the present invention, the wrapping material is fixed to at least one inner surface of the front and back sheets. Hollow composite fibers or crimped composite fibers can be used as the thermoplastic synthetic fibers. Further, tissue paper can be used for the wrapping material.

[0008]

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

A training pants 1 shown in a partially broken perspective view in FIG. 1 is viewed from the back side of a wearer, and includes a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and
A liquid absorbing core 4 is interposed between the sheets 2 and 3. The pants 1 include a front waist region 6, a rear waist region 7, and a crotch region 8 located between these two regions 6, 7.
And the front and rear waist regions 6 and 7 have their side edge regions 1
1 and 12 are overlapped and joined in a palm-shape manner to form a waist opening 13 and a pair of leg openings 14. A plurality of waist elastic members 16 and leg elastic members 17 are provided on at least one of the front and back sheets 2, 3 of the portion extending from the periphery of the core 4 on the periphery of these openings 13, 14. Is attached to the inner surface of the device in an extended state.

FIG. 2 shows the pants 1 of FIG.
FIG. 2 is a plan view showing a case in which the body circumferences 6 and 7 are developed in the front-rear direction so as to be flattened. Pants 1 unfolded
Is substantially rectangular, but each side edge of the crotch region 8 is curved inward. Such pants 1 have a width W ₁ and a length L ₁ . The core 4 is a rectangular shape extending in the directions of the front and rear waist regions 6 and 7 around the inseam region 8, has a width W ₂ and a length L _2, and is separated from the edge 6 A of the front waist region 6. The distance is m,
The distance between the rear waistline region 7 and the edge 7A is n. The pants 1 are, for example, W ₁ = about 370 mm, L ₁ = about 450 m
m, W ₂ = about 120 mm, L ₂ = about 300 mm, m = about 5
0 mm, and n = about 100 mm.

FIG. 3 shows a section taken along line III-III of FIG. The core 4 is at least 100 to 450 g
/ M ² superabsorbent polymer particles 21 and 10 to 100
a urine absorbing material 23 containing g / m ² thermoplastic synthetic fibers 22;
And a wrapping material 24 made of a liquid-permeable sheet surrounding the entire urine absorbing material 23. The wrapping material 24 is
It is joined to the top sheet 2 and / or the back sheet 3 via the first hot melt adhesive 26. When the first hot-melt adhesive 26 is interposed between the topsheet 2 and the wrapping material 24, the first hotmelt adhesive 26 significantly reduces the liquid permeability of the topsheet 2 and the wrapping material 24. It is applied intermittently so as not to interfere. The portions of the front and back sheets 2 and 3 extending from the periphery of the core 4 are joined to each other via a second hot melt adhesive 27.

The superabsorbent polymer particles 21 of the urine absorbing material 23
Is well known and used in the art. As the thermoplastic synthetic fiber 22, a hydrophobic fiber having a fiber length of 20 to 60 mm is preferably used. Such fibers are sheath and core type or side-by-side type composite fibers, and are more preferably crimped. The polymer particles 21 and the fibers 22 may form a layered urine absorbing material 23 in which the polymer particles 21 are mainly located in the upper layer and the fibers 22 are mainly located in the lower layer as shown in the illustrated example. . The urine absorbing material 23 is obtained by spraying the polymer particles 21 at a rate of 140 g / m ² on a random web of 20 g / m ² composed of, for example, a sheath / core type composite fiber 22 of polyethylene / polypropylene, and then spraying them. It can be obtained by sprinkling water at a rate of 12 to 15 g / m ² and then applying a pressure of 3 kg / cm ² for about 2 seconds. The polymer particles 21 are finer than the fiber gaps of the fibers 22 forming the web. When the polymer particles 21 are scattered on the web, they may enter the inside of the web.

FIGS. 4 and 5 show an embodiment of the core 4 in FIGS.
FIG. In the core 4 of FIG. 4, an intermediate layer of the fiber 22 is interposed between the upper and lower layers of the polymer particles 21. In the core 4 of FIG. 5, the polymer particles 21 and the fibers 22 are in a mixed state. Each of the cores 4 is preferably shaped into a rectangle or another required shape by being compressed in a water-containing state.

As the wrapping material 24, a liquid permeable sheet, preferably tissue paper is used. The wrapping material 24 covers the upper and lower surfaces of the urine absorbing material 23 and the surrounding side surfaces, and serves to maintain the shape of the urine absorbing material 23 until the pants 1 are used. It is useful to fix the pants 1 at a required position. The outer surface of the wrapping material 24 is
Although it is joined to at least one of the front and back sheets 2 and 3, the inner surface of the wrapping material 24 is only in contact with the urine absorbing material, and is a means for restraining the movement of the urine absorbing material 23. No adhesive or adhesive has been applied.

In the training pants 1 for infants configured as described above, when urine is absorbed by the superabsorbent polymer particles 21 of the urine absorbing material 23, the polymer particles 21 are gelled and swelled at the same time, and 4 is significantly increased in volume. When the polymer particles 21 in the front and rear waist regions 6, 7 and in the vicinity thereof become heavier due to urine absorption, they are guided by a tubular wrapping material 24 (see FIGS. Go down to the bottom of Zone 8. In the crotch region 8, the gelled and swollen polymer particles 21 are stuck together to form a heavy and large polymer mass. The presence of such a polymer mass gives the wearer a noticeable discomfort due to its wetness, weight and size. In addition, since the core 4 swells significantly due to the swelling of the polymer particles 21, mothers can detect from the appearance of the pants 1 that urination has occurred.

The urine absorbed by the superabsorbent polymer particles 21 does not evaporate easily. In particular, when the particles 21 form a polymer mass, the urine taken therein will give the wearer a feeling of wetness for a long time without evaporation.

In such pants 1, the core 4 is shaped under pressure, and when crimped fibers are used as the thermoplastic synthetic fibers 22, when the polymer particles 21 absorb urine and soften and swell. In addition, the compressed crimped fiber 22
It is elastically returned to the original crimped state, and the volume of the urine absorbing material 23 can be made larger than when the crimped fiber is not used. Therefore, as the urine absorbing material 23, as the thermoplastic synthetic fiber 22, preferably, a crimped fiber, more preferably, a crimped conjugate fiber is used. In addition, a straight hollow fiber may be used instead of the conjugate fiber. The hollow fiber which tends to elastically return to the original shape when deformed can increase the volume of the core 4 after urinating, like the crimped fiber. As the fibers 22, it is also possible to use hydrophobic thermoplastic synthetic fibers other than crimped fibers and hollow fibers. The superabsorbent polymer particles 21 tend to prevent urine from penetrating through the polymer mass and reaching the polymer particles 21 below the polymer mass when the polymer mass becomes a gel-like polymer mass. The hydrophobic synthetic fibers can somewhat prevent such agglomeration of the polymer, and when gaps are formed between the polymer chunks, urine passes through the gaps to lower polymer particles 21. Can be reached.

The infant training pants 1 and the core 4 according to the present invention are not limited to those having the exemplified shapes and sizes. For example, the width W ₂ and length L ₂ of the core 4, for the location, such as in the pants 1 of the core 4 can be appropriately changed. The plane shape of the core 4 may be an hourglass shape that follows the developed shape of the pants 1. The urine absorbing material 23 has 10
By mixing the pulverized pulp up to the weight%, the urine absorbing material 23 can be easily shaped into a required shape.

[0019]

In the training pants for infants according to the present invention, since the urine absorbs and gels, the swollen superabsorbent polymer particles become clumpy in the crotch region and can give the wearer of the pants remarkable discomfort. The effect of wearing training pants is great.

In the underpants after urination, the crotch region expands abnormally, so that it is possible to detect from the appearance that urination has occurred.

The urine absorbed by the superabsorbent polymer particles is
Since they do not evaporate easily, the training pants can provide the wearer with moist feeling for a long time.

By fixing the wrapping material for the urine absorbing material to at least one of the front and back sheets, the gelled super-absorbent polymer particles are guided to the wrapping material, and the crotch region can be reliably assured. Collect at the bottom, where the polymer mass can be formed.

By using the superabsorbent polymer particles and the crimped conjugate fiber or hollow fiber in combination, the volume of the core after urine absorption can be further increased.

By using the superabsorbent polymer particles and the hydrophobic thermoplastic synthetic fibers in combination, urine can be transferred promptly in the thickness direction of the urine absorbing material.

[Brief description of the drawings]

FIG. 1 is a partially broken perspective view of a training pants.

FIG. 2 is a development view of the training pants in FIG.

FIG. 3 is a view showing a cut surface along the line III-III in FIG. 2;

FIG. 4 is a drawing similar to FIG. 3, showing an example of the embodiment;

FIG. 5 is a drawing similar to FIG. 3, showing an example of the embodiment;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 training pants 2 top sheet 3 back sheet 4 core 21 superabsorbent polymer particles 22 thermoplastic synthetic fiber 23 urine absorbent 24 wrapping material

Claims (5)

[Claims] 1. A disposable infant training pants in which a liquid-absorbent core is interposed between a liquid-permeable topsheet and a liquid-impermeable backsheet, wherein the liquid-absorbent core is at least 100%. ~ 450g / m
^2. A urine absorbing material composed of ² superabsorbent polymer particles and 10-100 g / m ² of thermoplastic synthetic fiber, and a liquid-permeable sheet-like wrapping material surrounding the urine absorbing material. The underpants, wherein the urine material is not restrained by an adhesive or a pressure-sensitive adhesive on the inner surface of the wrapping material, and is movable in the wrapping material. 2. The pants according to claim 1, wherein the wrapping material is fixed to at least one inner surface of the front and back sheets. 3. The pants according to claim 1, wherein the thermoplastic synthetic fibers are hollow composite fibers. 4. The pants according to claim 1, wherein the thermoplastic synthetic fibers are crimped conjugate fibers. 5. The pants according to claim 1, wherein the wrapping material is tissue paper.