JPS61174479A - Water absorbable cloth - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a water-absorbing fabric that has a difference in water-absorbing properties in the thickness direction so that water is unevenly distributed only in the intermediate layer.

[Conventional technology]

In recent years, there has been a demand for fabrics with various functions in the clothing field, and for water-absorbing fabrics, which are important in underwear, for example, there has been a demand for fabrics that have uneven distribution of water and have parts with different water-absorbing properties. There is. Fabrics having this uneven distribution of moisture are used, for example, in sweat-repellent underwear worn during strenuous exercise or work that involves sweating.

In general, sweat generated during strenuous exercise or work that involves sweating not only causes discomfort due to stickiness between skin and clothing, but also causes a drop in body temperature due to latent heat due to water evaporation from the skin, which is not good for health. It is also a cause of colds. Therefore, the back layer of the fabric (
A moisture unevenly distributing fabric has been developed that diffuses moisture absorbed from the skin-contacting side to the highly absorbent outer surface layer.
It is commercially available.

[Problem that the invention seeks to solve]

However, when the above-mentioned fabric is used for underwear such as shirts, moisture diffuses from the back layer through the middle layer to the surface layer when sweating, and is retained in the surface layer. Because it looks different from the color of other parts,
It exhibits a mottled appearance that is visually extremely undesirable.
This was a fatal flaw, especially for fabrics such as women's shirts, and women tended to completely dislike it.

[Means and effects for solving the problem] In view of the current situation, the present invention has been developed to evaluate the properties of the fibers in each of the three layers, the optical surface layer, the intermediate layer, and the back layer, by determining the contact angle W with water, respectively. −
This is a water-absorbing fabric characterized in that the surface area S satisfies the following formula: %().

The fabric according to the present invention is one of various fibers such as synthetic fibers such as polyester and polyamide, regenerated fibers such as rayon, or natural fibers such as wool. When the contact angle is equal to W, , W, the surface area S2 of the fibers in the intermediate layer is larger than the surface area S1.83 of the fibers in the interface layer and the back layer.

Various methods can be used to obtain the fabric of the present invention.
First, when utilizing the characteristics of the fibers themselves that form the fabric, for example, the middle layer is made of cotton, rayon, etc., which have a small contact angle with water, and the entire interface layer and back layer, such as polyester fiber, which has a relatively large contact angle. be used for each. Then, the surface layer and the middle layer.

When using the same fibers for the back layer, use threads with a large surface area (for example, thick threads or thin multifilament threads) for the intermediate layer, and threads with a small surface area for the interface layer and the back layer.
Use each.

Next, as a method of post-processing the fabric to obtain the fabric of the present invention, the interface layer and the back layer of the fabric made of the same fabric but different fibers except for the middle layer are coated with fluorine resin, silicone resin, etc. Examples include a method of applying a water repellent agent to
It is necessary to apply a thin layer of water repellent to the outer layer only.
In addition to this method, the most desirable method for obtaining the fabric of the present invention is to first apply hydrophilic groups to the entire fabric made of the same fibers. A hydrophilic finishing agent such as a polymeric compound having the above properties is applied, and then a water repellent finishing agent is applied only to the surface layer and the back layer using a gravure roll, or a water repellent finishing agent is applied to the surface layer and the back layer to the intermediate layer. There is a method in which a hydrophilic finishing agent is applied to the entire FC fabric using fibers having a small contact angle, and then a water repellent finishing agent is applied only to the interface layer and back layer using a gravure roll or the like. In this case, the water-repellent finish is resin skin! 1
11 It is desirable to apply it thinly and lightly. In addition, it is also possible to first give the front and back layers of a fabric made of the same or different fibers a water-repellent coating using Gravure, and then to make the entire fabric hydrophilic. Whichever order you use with water processing comes first, the same effect can be obtained. However, it is desirable to change the prescription depending on the order.

Since the fabric according to the present invention has the above configuration, 1
Moisture that comes into contact with the surface layer or the back layer is rapidly transferred to the intermediate layer, where it is retained and does not transfer to other layers, so that the appearance does not change.

Example 1 A smooth fabric knitted with polyester filament processed yarn of 75 denier 736 filament was subjected to scouring, dyeing, and heat treatment (7 times), and then coated with a fluorine resin liquid (Asahi) on one side using a coating machine equipped with a gravure roll. Guard AG710 manufactured by Meisei Kagaku Kogyo Co., Ltd.) was applied, heat set was applied, and the same fluororesin liquid was applied to the other side, heat set was performed, and then a polymeric compound with hydrophilic group tV (SR100O Takamatsu Oil) was applied. Co., Ltd.) to make the intermediate layer hydrophilic, and then heat set to a predetermined value of 160 g/rI? A water absorbent fabric was obtained.

Comparative Example 1 The same smooth fabric as in Example 1 was subjected to the same scouring and dyeing, and after being fully dipped in a softener and antistatic agent solution, it was heat set to give a normal finish.

Example 2 A reversible structure knitted with 75 denier/36 filament polyester yarn was heat set, and then a silicone resin liquid was applied to one side using a coating machine equipped with a gravure roll and heat set was performed. , Furthermore, a silicone resin liquid was similarly applied to the other side and heat set was applied to the other side, and 1909/rr? A water absorbent fabric was obtained.

Comparative Example 2 The same fabric as in Example 2 was scoured and dyed in the same manner as in Example 2, and after dipping with a softener and an antistatic finishing agent solution, it was heat set to give a normal finish. A fabric with a tack reversible structure using a 75 denier/36 filament polyester filament processed yarn and 40-count cotton as the tuck yarn in the middle layer was processed in the same manner as in Example 2, and 180 g/rI? A water absorbent fabric was obtained.

Comparative Example 3 After scouring and dyeing the same fabric as in Example 3 and dipping it with a softener and an antistatic agent, heat cera) t-
Compared to normal finish.

Example 4 A fabric with 150 denier 748 filament processed polyester yarn for the surface layer, 30 count cotton for the middle layer, and pile yarn of 150 denier/30 filament processed polyester yarn for the back layer was refined, and the same was applied during the next dyeing. After applying the same hydrophilic polymer compound as in Example 1 in a bath and applying heat cera, silicone resin was applied only to the surface layer using a coating machine equipped with a gravure roll, and heat setting 1 was applied. 3209/rr? A water absorbent fabric was obtained.

Comparative Example 4 The same fabric as in Example 4 was subjected to the same scouring, dyeing, and dipping in a softener and antistatic agent solution, followed by heat setting and a normal finish.

Example 5 A fabric with a 2/2 twill structure using polyester filament processed yarn with 150 denier 748 filaments in both warp and weft was subjected to usual scouring, dyeing and heat setting, and then the surface layer and After treating the back layer and dipping a hydrophilic polymer compound,
25011/rr after heat setting? A water absorbent fabric was obtained.

Comparative Example 5 The same fabric as in Example 5 was scoured and dyed in the same manner, dipped in a softener and an antistatic agent, and then heat set to give a normal finish.

Various effects tested on the fabrics obtained in the above Examples and Comparative Examples are shown below.

1. Water absorption effect (1) Drop water droplets with diffusivity o, oscc to a height of 5 cm on the fabric,
Table 1 shows the diffusion of moisture in each layer when specular reflection was no longer observed after dropping, expressed as the area where the moisture was diffused. In Table 1, the case where the dropping surface was used as the surface layer was referred to as "front", and the case where the dropping surface was used as the back layer was referred to as "back".

Table 1 As is clear from Table 1, the fabric according to the present invention has much better diffusibility into the intermediate layer than the comparative example.

(2) Wet state of the surface layer and back layer after diffusion Place the qualitative F paper 11 on a smooth table, place the sample on top of this paper, and place the sample on the sample from a height of 5a11. 05cr-
When specular reflection was no longer observed, a piece of paper of the same type as above was placed on top of the sample, and a weight with a base area of 4-2 and a weight of 200 g was added on top of the sample. Place it so that it is in the same position as the other part. Release the weight for 10 seconds! 44e'1ThklljL-7c G4'1
llJ Δ1 L〒l/ 1126yu, Jtsu 4 a
#4J: /F% 7 The results of examining the condition (area) are shown in Table 2.

Table 2 As is clear from Table 2, the fabric according to the present invention has less moisture seeping into the upper and lower filter papers than the comparative example.

2. Collect an 8 cm x 8 cm surface color change sample, add water o from the surface,
Table 3 shows the results of dropping oscc until the entire surface of the sample was wet, and then determining the discoloration and fading of the surface using a gray scale for determining discoloration and fading.

Table 3 As is clear from Table 3, the fabric according to the present invention shows less color change when absorbing moisture than the comparative example, and does not cause discomfort due to color change when worn.

3.Hot water barrier property 6 drops (1 drop 2Q, Qlcc) of 70℃ boiling water on the fabric 5+
The temperature of the back surface of the sample was measured by a temperature sensor when the sample was dropped from the position above m and the position in contact with the fabric (ambient temperature: 20° C.).

Table 4 As is clear from Table 4, in the case of the fabric according to the present invention, the measured temperature was approximately 10°C lower than that of the comparative example, and the fabric had excellent hot water barrier properties, making it suitable for aprons used when feeding children, infants, etc. It is best used for etc.

4. Dry: Add 3 drops of water to the center of the sample and heat the sample in both the dry state and saturated wet state at a temperature of 2°C ± 2°C and a humidity of 60~6°C.
Table 5 shows the results of measuring the change in water weight when the sample was left to dry naturally in a room maintained at 5% RH and the original weight of water was 1loo.

Table 5 As is clear from Table 5, the fabric according to the present invention exhibits the same drying properties as the fabric of the comparative example.

[Effects of the present invention]

As is clear from the above description, (1) the water-absorbing fabric according to the present invention quickly transfers moisture such as sweat that comes into contact with the surface layer or the back layer to the intermediate layer, does not leave any moisture on the surface layer or the back layer, and , it does not migrate beyond the middle layer and create an unpleasant mottled appearance, making it suitable for undergarments to remove sweat from the skin during exercise or work, as well as retain moisture from the outside in the middle layer. Because it has moisture-blocking properties, when used in infant aprons, etc., even if hot water is splashed on it from the outside, it will be absorbed by the middle layer, and the hot water will be diffused along the middle layer, helping to prevent accidents. can be.

Furthermore, by containing a water-dispersed drug in the middle layer, the drug can be retained without coming into contact with the skin, and the disinfectant and antibacterial effects can be maintained without harming the affected area. is possible.

Claims (1)

[Claims] The properties of the fibers in each of the three layers consisting of the surface layer, intermediate layer, and back layer are determined by the following formula: W_1 (surface layer) > W_2 (intermediate layer), where the contact angle W with water and surface area S are respectively <W_3 (back layer) or {W_1 (surface layer)≧W_2 (intermediate layer)≦W_3 (back layer), S_1( 〃 )<S_2( 〃 )>S_3( 〃
)} A water-absorbent fabric that satisfies the following.