JP2003136621A - Highly liquid-absorbing composite material and diaper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diaper which need not be released or combined and folded to a special shape and shows outstanding high liquid absorption characteristics, water retention and drying characteristics and comfortable/ smooth surface touch. SOLUTION: A liquid absorbing material is inserted, as an intermediate material, between liquid-permeable and dispersing sheets as a surface material, which show an instantaneous dispersion and a dispersion area of 3.0 cm<2> or more one minute later, as measured in compliance with a drip method stipulated by JIS L 1907. Thus this sheet-like composite material is peculiar for its high liquid absorption rate and superb liquid retention and at the same time, excellent drying characteristics. In addition, the sheet-like composite material is characterized in that its surface material is a hydrophobic synthetic fibrous woven texture with at least the surface of the outside treated for raising. The diaper is obtained by cutting and/or sewing either of the described sheet-like composite materials. In addition, the diaper is formed of the liquid absorbing material which is itself a material treated for deodorizing or the liquid absorbing material treated as an intermediate material, with the inserted material treated for deodorizing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-shaped composite material which has excellent liquid absorbing and liquid retaining properties and also excellent drying property. The present invention also relates to a diaper using the above composite material.

[0002]

2. Description of the Related Art Various diapers have been devised for the elderly and people in bed. As one type, there is a case where a disposable type is conveniently used because it saves labor such as washing and has a feeling of living. However, the idea of disposable type is being reflected from the viewpoint of resource saving in recent years. Recently, the reusable type is becoming mainstream. A widely used reusable diaper is a set of about three diaper cloths, which are folded and attached to suit the use. After being used, washed and dried, it is assembled by a specialist and folded by each method. The cloth used is a fabric called Dobby woven cloth made of mostly cotton (the size is 30c) in terms of touch, moderate liquid absorption and reusability.
m × 100 cm) is the standard. This diaper needs to be peeled off and washed one by one after use, and it is necessary to combine the diapers each time it is used, and the method of folding and the method of use also differ depending on the user.

[0003]

DISCLOSURE OF THE INVENTION The present invention does not need to be peeled off one by one or combined and folded into a special shape, and is excellent in liquid absorption and drying.
The present invention also provides a diaper having a good feel to the touch, and a sheet-like composite material suitable for use as such a diaper.

[0004]

The present invention is based on JIS L 1
The diffusing speed measured according to the dropping method prescribed in 907 is instantaneous, and the diffusing area after 1 minute is 3.0 cm ² or more. Excellent in liquid absorption rate and liquid retention by inserting a flexible material,
At the same time, it relates to a sheet-shaped composite material having excellent dryness. In particular, the present invention relates to the above-mentioned sheet-shaped composite material in which the surface material is a hydrophobic synthetic fiber knitted fabric having a nap treatment on at least the outer surface thereof. In one aspect, the present invention provides
The present invention relates to the above sheet-shaped composite material, which further retains an absorbent / drainage polymer as an intermediate material. Further, as one aspect, the present invention relates to the sheet-shaped composite material as described in any one of the above, wherein a large number of small liquid retaining spaces are provided in the liquid absorbent material portion. Preferably, the present invention relates to the sheet-shaped composite material according to any one of the above, which has a liquid retention amount of 0.3 to 1.5 g / cm ² . Also preferably, the present invention is 6 at 60 ° C. or higher after dehydration treatment.
The sheet-shaped composite material according to any one of the above, which can be dried within 0 minutes. The present invention also relates to a diaper obtained by cutting and / or sewing the sheet-shaped composite material described in any one of the above. Furthermore, the present invention relates to the above-mentioned diaper in which the liquid absorbent material itself which is a middle material is used as a deodorant processed material, or the deodorant processed material is sandwiched together with the liquid absorbent material as a middle material.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The sheet-shaped composite material of the present invention comprises two liquid-permeable / diffusible sheets having an excellent diffusion rate as a surface material and a liquid-absorbent material sandwiched therebetween as an intermediate material. Is a hydrophobic synthetic fiber knitted fabric that has excellent liquid absorption rate and liquid retention, as well as excellent drying properties, and at least the outer surface of which has a permeable / diffusive sheet that is napped. The feature is that it has a good touch. In the present invention, "liquid-permeable / diffusive sheet"
Is a material having a high diffusion rate, which allows the liquid in contact with it to quickly permeate and diffuse to the opposite surface without being absorbed by the material. Further, in the present invention, the “liquid absorbing material” means a material having both a high liquid absorbing speed and a high liquid retaining property. Further, the "liquid retaining property" means a property that a liquid retaining amount, that is, a saturated liquid absorbing amount is large.

The liquid-permeable / diffusible sheet used as the surface material of the sheet-like composite material of the present invention has an instantaneous diffusion rate measured according to the dropping method specified in JIS L 1907, and the diffusion after 1 minute. The area is 3.0 cm ² or more. Due to this excellent liquid permeability / diffusion property, the liquid that has reached the surface of the sheet-shaped composite material of the present invention does not remain on the liquid-permeable / diffusive sheet that is the surface material or is not absorbed by the liquid and diffuses quickly. Then, the inner material inserted inside, that is, the liquid absorbing material, is absorbed and retained in the liquid. Therefore, when the sheet-like composite material of the present invention is used as a diaper or the like that is in direct contact with the skin, the surface of the diaper does not remain in a wet state and the skin does not cause discomfort. The value expressed by the diffusion area is more preferably 5.0 cm ² or more. Therefore, it is also preferable that the surface material is non-absorbent. The material of the liquid-permeable / diffusive sheet used as a surface material, which has excellent liquid-permeable / diffusive property and is also non-absorbent, is a fiber product made of a hydrophobic synthetic fiber such as polyester, nylon, or acrylic. There is no particular limitation as long as it is a material that is preferable and has excellent elasticity and a good touch. For example, a knitted material is exemplified.

Further, it is preferable that at least the outer surface of this liquid-permeable / diffusive sheet is brushed from the viewpoint of touch. Here, the outer surface means a surface that comes to the outside in a state where a liquid-absorbent material is inserted inside to form a sheet-shaped composite material. The height of the raised hair is preferably about 1.0 to 3.0 mm, and particularly preferably 1.0 to 2.0 mm. The raising treatment can be performed by any method such as emery raising using sandpaper and suede raising using needle cloth.

It is preferable that the liquid-absorbent material inserted as an intermediate material between the two liquid-permeable / diffusive sheets has a large liquid-retaining capacity and a high liquid-absorbing speed. Further, it is preferable that not only the liquid absorbing property (liquid retaining property and liquid absorbing speed) is excellent, but also the drying property is excellent at the same time. In this respect, a suitable liquid-absorbent material can be exemplified by a sheet-shaped cellulosic fiber product such as a cellulosic fiber woven fabric, a knitted fabric or a nonwoven fabric, and a sheet-shaped cotton product is particularly preferable. Examples of the sheet-shaped cotton product include “dobby woven fabric” which has been conventionally used for diapers. Further, a cotton product having a liquid absorbent / absorbent polymer retained therein can be preferably used as the liquid absorbent material of the present invention. The term "absorbent / drainable polymer" as used herein means one that absorbs and drains liquid depending on temperature, and examples thereof include isopropylacrylamide polymer.

The liquid holding capacity of the liquid absorbing material is 0.3 to 1.5 g / c.
It is preferably m ² , particularly 0.4 to 1.0 g / cm ² . The liquid holding amount of the liquid absorbing material almost determines the liquid holding amount of the sheet-shaped composite material. Further, since the surface material is non-liquid-absorbing, the drying speed of the sheet-shaped composite material is almost determined by the drying speed of the liquid-absorbing material.
The drying rate at -100 ° C is preferably 30 to 60 minutes, particularly preferably 40 minutes or less.

In the sheet-shaped composite material of the present invention, a large number of small spaces for retaining liquid can be provided at the liquid absorbing member which is an intermediate material to further increase the amount of retaining liquid. A three-dimensional structured fiber product or the like can be incorporated as a means for introducing such a liquid retaining space. As the three-dimensional structural fiber product, for example, "AT-008" manufactured by Asahi Technos Co., Ltd.
An example is a three-dimensional knitted fabric "01".

The sheet-like composite material of the present invention is a structure in which a liquid-absorbent material is inserted as an intermediate material between the liquid-permeable sheets as described above, and in order to maintain this form during use and reuse. It is desirable to sew or bond at least the periphery thereof. Further, not only the periphery but also the center portion may be sewn so that the center material does not shift and also has a design.

The present invention also provides a diaper made of the above sheet-shaped composite material. The diaper of the present invention can be manufactured by directly or sewn the above-mentioned sheet-shaped composite material, or by cutting it into an appropriate shape and then sewn. The size of the diaper may be appropriately selected each time according to the body shape of the user and the way of wearing, and is not particularly specified, but for example, the standard size is width 15 cm × length 40 cm, width 2
5 cm x 80 cm in length may be mentioned.

The diaper of the present invention can be provided with a deodorizing function. Therefore, the liquid absorbing material itself may be a deodorized material, or the deodorizing material may be sandwiched together with the liquid absorbing material as an intermediate material. In order to deodorize a liquid-absorbent material, for example, a cotton inner material, graft polymerization according to the method described in Japanese Patent Application No. 2001-137694 can be used from the viewpoint of industrial washing resistance. An example thereof is a method in which a fiber product to be treated is subjected to radiation graft polymerization while being immersed in an aqueous methanol solution containing a monomer mixture of acrylic acid and sodium vinyl sulfonate or a monomer mixture of acrylic acid and vinylbenzyltrimethylammonium chloride.

[0014]

EXAMPLES The present invention will now be described in more detail and concretely with reference to Examples. Example 1 As a liquid-permeable sheet material that is a surface material, a suede raising machine using a needle cloth on a satin knitted fabric (manufactured by Kanebo Co., Ltd., product number KRD5545) having a basis weight of 134 g / m ^{2 made} of polyester fiber having a modified cross section is used. What formed the raising of 5 mm was used. This liquid-permeable sheet material has an instantaneous liquid-permeation rate by the dropping method specified in JIS L 1907, and the diffusion area 1 minute after that is 11.6 cm ² . A cotton dobby woven fabric (manufactured by Kurashiki Spinning Co., Ltd .; fabric name AF2880) having a basis weight of 226 g / m ² was used as the liquid absorbent material as the intermediate material. Four dobby woven fabrics were inserted between the two liquid-permeable sheet materials stacked with the nap-forming surface facing outward to form a 6-layer laminate, which was cut into the shape shown in FIG. , It was sewn along the circumference so that the shape would not be broken even if it was used or washed. The sheet-shaped composite material thus obtained can be used as it is as a diaper. With respect to the surface material used and the obtained sheet-shaped composite material, the diffusion rate, the diffusion area, the liquid retaining property and the drying property, and the wearability as a diaper were evaluated.

Example 2 A three-dimensional structural fiber product "AT00801" (manufactured by Asahi Technos Co., Ltd.) was inserted between two non-woven fabrics having a basis weight of 250 g / m ² (product number AP200 manufactured by Kurashiki Textile Co., Ltd.) as a middle material. A sheet-shaped composite material was prepared in the same manner as in Example 1 except for the above. With respect to the surface material used and the obtained sheet-shaped composite material, the diffusion rate, the diffusion area, the liquid retention property and the drying property were evaluated.

Example 3 A sheet-shaped composite material was prepared in the same manner as in Example 1 except that a cotton dobby woven fabric having a basis weight of 226 g / m ² (manufactured by Kurabo Industries; fabric name AF2880) was used as the middle material after deodorizing. I made wood. The deodorizing treatment of the dobby woven fabric was performed as follows: the dobby woven fabric was degassed and exposed to radiation of 30 KGy in a deoxidized state.
Irradiated. This is placed in a graft polymerization treatment tank, degassed,
The supply of nitrogen was repeated to remove oxygen in the treatment tank. Then, the treatment tank was filled with a mixed solution of 90% by weight of water and 10% by weight of methanol containing 10% by weight of acrylic acid and 20% by weight of sodium vinyl sulfonate that had been deaerated and replaced with nitrogen (oxygen concentration of 1% or less) in advance. The dobby woven cloth was dipped in this. The temperature in the treatment tank was gradually raised to 50 ° C., and the treatment was performed for 1 hour in a deoxidized state. During this time, the normal / reverse rotation of the pump was repeated at regular intervals, and the mixed solution containing the monomer was flowed through the dobby woven fabric and brought into contact therewith. Then, the dobby woven fabric after the graft polymerization treatment was taken out, washed with water and dried. The performance evaluation results of Examples 1 to 3 are shown in Table 1. Further, with respect to this sheet-shaped composite material, the ammonia deodorizing performance and the durability of its effect were also evaluated, and the results are shown in Table 2.

[0017]

[Table 1]

[0018]

[Table 2]

The performance evaluation of Examples 1 to 3 and the comparative sample was carried out by the following method. [Diffusion rate of surface material alone] Measured according to the dropping method specified in JIS L1907. [Diffusion rate (as sheet-shaped composite material)] JIS L 19
It measured according to the dropping method prescribed | regulated in 07. [Diffusion area (composite in sheet form)] Water was dripped in accordance with the dropping method specified in JIS L 1907, and the diffusion area after 1 minute was measured.

[Liquid-retaining property (sheet-shaped composite material)] 5 cm × 5
Create a test sample of cm and measure the weight (W). Then, after being immersed in the aqueous solution for 20 minutes, it was hung for 5 minutes, drained to measure the weight (W1), and the liquid retention amount was calculated from the following formula. Liquid retention amount (g / cm ² ) = (W1−W) g / 25 cm ² [drying property (sheet-shaped composite material)] A test sample of 15 cm × 40 cm was prepared and the weight (W) was measured. Then, after washing for 20 minutes in a home washing machine, hanging for 5 minutes and draining the water (W
Measure 1). Then, after centrifuge dehydration for 3 minutes, it was placed in a tumble dryer and 60 minutes later, the dry weight (W2) was measured, and the drying rate was calculated from the following calculation formula. Drying rate (%) = 100 × (W1-W2) g / (W1-
W) g However, the dobby woven fabric was evaluated by using two woven fabrics.

[Wearability as a Diaper] About Example 1 Ten diaper users actually worn the diapers and evaluated their wearing feeling, wetting feeling and the like on a three-level scale. ○ ……… Comfortable. △ ……… It is a level that can be put up with neither. × ……… Is uncomfortable.

[Ammonia deodorizing performance] 1 g of a sample was placed in a 1 L Tedlar bag, and a predetermined concentration of ammonia gas was filled therein, and after 10, 30 and 60 minutes, the gas concentration in the Tedlar bag was measured by a detector tube. However, the evaluation was performed for the medium material alone. [Durability of ammonia deodorant performance] Industrial laundry 1 shown in Table 2
Put 50ppm ammonia gas into a Tedlar bag containing the sample pieces after washing at 0W, 30W and 50W,
After a minute, measure the residual ammonia concentration with a gas detector tube,
The deodorization rate was compared. However, the evaluation was performed for the medium material alone.

[0023]

INDUSTRIAL APPLICABILITY The sheet-shaped composite material of the present invention is suitable as a diaper because it has excellent liquid permeability and liquid absorbency, as well as excellent dryness, and has a good texture. When used as a diaper, one piece alone has satisfactory performance, so there is no need to combine multiple pieces or fold them, and since the bulk after folding is small, it can be packed compactly and also for delivery. It is advantageous. In addition, the type to which the deodorizing function is added has no odor during storage until washing, which is highly valuable to the user.

[Brief description of drawings]

FIG. 1 is a plan view showing the shape of a diaper of the present invention.

[Explanation of symbols]

1: Over 2 needles (all around) 2: Lockstitch stitch.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) D04H 1/42 A41B 13/02 P (72) Inventor Susumu Katsuro 2-chome, Kutaro-cho, Chuo-ku, Osaka-shi, Osaka 4-31 Kurashiki Spinning Co., Ltd. Osaka Main Office (72) Inventor Eiji Jimmu 2-431, Kutarocho, Chuo-ku, Osaka City, Osaka Prefecture Kurashiki Spinning Co., Ltd. Osaka Main Office (72) Inventor Kusamitsu Koji Osaka Prefecture 2-43-1 Kutaro-cho, Chuo-ku, Osaka Kurashiki Spinning Co., Ltd. Osaka Head Office (72) Inventor Kenji Nitta 2-43-31, Kutaro-cho, Chuo-ku, Osaka City, Osaka Kurashiki Spinning Co., Ltd. F-term (Reference) 3B029 BG03 BG06 HA02 HA06 HA08 HB05 4C098 AA09 CC03 CE06 DD02 DD05 DD06 DD07 DD09 DD14 DD23 DD26 DD27 DD28 4F100 AJ04B AK01C AK25A AK41A AK46A AR00C BA03 BA07 BA10A BA10B DG01A DG01B GB72 JB06A JC00C JD15C YY00C 4L002 AA05 AC00 CA01 DA02 DA03 EA03 FA00 4L047 CA05 CB07 CC04

Claims (11)

[Claims] 1. A liquid-permeable / diffusive sheet as a surface material, which has an instantaneous diffusion rate measured according to the dropping method specified in JIS L 1907 and has a diffusion area after 1 minute of 3.0 cm ² or more. Inserting a liquid absorbing material as a middle material between
A sheet-shaped composite material that excels in liquid absorption speed and liquid retention, as well as in dryness. 2. The sheet-shaped composite material according to claim 1, wherein the surface material is a hydrophobic synthetic fiber knitted fabric having a nap treatment on at least an outer surface thereof. 3. The sheet-shaped composite material according to claim 2, wherein the napped hydrophobic synthetic fiber knitted fabric is a polyester, nylon or acrylic knitted fabric napped by a nap raising machine. 4. The sheet-shaped composite material according to claim 1, wherein the liquid-absorbent material is a sheet-shaped cellulosic fiber product. 5. The sheet-shaped composite material according to claim 1, further comprising an absorbent / drainage polymer held as a middle material. 6. The sheet-shaped composite material according to claim 1, which has a liquid retention amount of 0.3 to 1.5 g / cm ² . 7. The sheet-shaped composite material according to claim 1, which can be dried at 60 ° C. or higher and within 60 minutes after the dehydration treatment. 8. The sheet-shaped composite material according to claim 1, wherein a large number of small liquid retaining spaces are provided in the liquid absorbing material portion. 9. The sheet-shaped composite material according to claim 8, wherein a large number of small liquid retaining spaces are provided by a three-dimensional knitted fabric. 10. A diaper obtained by cutting and / or sewing the sheet-shaped composite material according to claim 1. 11. The diaper according to claim 10, wherein the liquid absorbent material itself is used as a deodorant processed material, or the deodorized material is sandwiched together with the liquid absorbent material as an intermediate material.