JPS626933A - Offset 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 (a) Field of Industrial Application The present invention relates to an unevenly distributed water-absorbing fabric suitable as a fabric for clothing, especially one worn in direct contact with the skin.

(b) Conventional technology Traditionally used in underwear, sportswear, etc.

With the intention of eliminating discomfort such as stickiness caused by wetness during sweating, fabrics using hydrophilic fibers such as cotton yarn and rayon yarn, fabrics using blended yarns of cotton and synthetic fibers, and fabrics made with cotton yarns and synthetic fibers. On the other hand, when producing synthetic fibers, for example, the molecular structure itself is made hydrophilic in the polymerization step, or blended and spun with wood-philic polymers to make it hydrophilic. Fabrics are being produced using recycled fiber threads. However, in the case of the former type of fabrics, such as fabrics using cotton yarn, blended yarns of cotton and synthetic fibers, and fabrics with a cotton lining structure, when the cotton fibers, which are hydrophilic fibers, absorb water, they have a large water-holding capacity, but they swell and retain water, resulting in evaporation. It has poor scattering ability,
The color fastness is poor, and the color of the dyed fabric becomes dull, making it impossible to obtain vivid colors.

Furthermore, when worn, there are problems with pilling, snagging, etc., which often occur due to friction, snagging, etc. In the case of using synthetic fibers that have been made hydrophilic during production, such as the latter, there are problems such as a decrease in spinnability during spinning, a decrease in strength in the form of yarn or fabric, and a decrease in hand feel. In addition, these conventional underwear and sportswear cannot sufficiently absorb and evaporate the sweat generated during hot and humid summer weather or during strenuous exercise, resulting in the skin still feeling wet and sticky, and the fabrics becoming wet and sticky. It has not yet been possible to sufficiently eliminate the discomfort caused by sweat clinging to the skin, and when the temperature is cold, the absorbed sweat often cools and causes colds, muscle disorders, etc. Particularly in the case of sportswear, in order to reduce discomfort, the cause of colds, and the effect on muscle disorders, the fabric absorbs sweat generated on the skin quickly (absorbs it), conducts it to the surface layer, and transfers it to the fabric surface that is in contact with the skin. It is desirable that there is little residual sweat.

(c) Problems to be Solved by the Invention The present invention solves the aforementioned insufficiency of sweat evaporation during sweating in the fabrics used in conventional underwear and sportswear.

The present invention aims to provide a fabric that can be used to form underwear, sportswear, etc. that can be comfortably worn without discomfort such as stickiness, clinginess, or coldness by quickly transporting sweat from the skin to the surface. It is something to do.

(d) Means for Solving the Problems The present invention provides a surface fiber layer made of surface-hydrophilized synthetic fibers with a W-shaped cross section, and a back surface fiber layer made of surface-hydrophilized synthetic fibers with an irregular cross section of 50% or less. The gist is a unevenly distributed water-absorbing fabric with a two-layer structure consisting of two layers.

Hereinafter, one aspect of the present invention will be explained in detail.

Firstly, in the unevenly distributed water absorbing fabric of the present invention, the first surface layer has a W-shaped cross section and is composed of synthetic fiber threads whose fiber surface has been made hydrophilic, and the back layer has a fiber cross section with an irregular cross section with a degree of irregularity of 50% or less. ,
It is a two-layer woven or knitted fabric made up of synthetic fiber yarns whose fiber surfaces have been made hydrophilic.

The synthetic fibers mentioned here include polyester fibers (polyethylene terephthalate fibers, etc.).

Copolymerized polyethylene terephthalate fibers containing isophthalic acid, paraoxybenzoic acid, sulfoisophthalic acid, or butylene glycol as copolymer components), polyamide fibers (nylon-4 fibers, nylon-6 fibers, nylon-66 fibers, nylon-610 fibers) fibers or nylon-11 fibers). The synthetic fibers used in the surface fiber layer of the fabric of the present invention have a W-shaped cross-sectional shape, as shown in FIGS. 1(a) to 1(b). Fibers with a W-shaped cross section exhibit very good water absorbency and water conductivity because the four parts and convex parts between adjacent fibers mesh well and come into close contact, effectively forming one capillary path. Figure 1 (
The W-shaped cross-sectional fibers shown in a) to (b) are respectively
Spinning can be performed using a spinneret with a nozzle shaped as shown in Figures (A) to (B).

The synthetic fibers used for the back fiber layer of the fabric of the present invention are as follows.

It has an irregular cross-sectional shape with an irregularity degree of 50% or less.

The degree of irregularity (%) here is determined by a 9th order equation.

Degree of irregularity (%) -(1--1') Contains things. A perfect circular cross section can be expressed as an irregularity degree of O%. Each of the above-mentioned fibers is used in the form of a multifilament yarn, a false-twisted bulky yarn, a spun yarn, or the like. From the results of numerous experiments, the fibers forming one surface fiber layer are selected to have a W-shaped cross section in order to effectively maintain the water transferability, water retention and evapotranspiration properties described above.

There are also synthetic fiber yarns with various cross-sectional shapes, but these are undesirable from practical standpoints, such as poor water absorption, poor spinning properties during production, deterioration in the quality of knitted and woven fabrics, and changes in texture. On the other hand, the fibers constituting the back fiber layer (the surface that comes into contact with the skin) should have a round or triangular cross-sectional shape in view of their water absorption relative to the second surface fiber layer, as well as their texture and texture. , those having a degree of irregularity of 50% or less are preferably selected. In order to construct the fabric, either warp knitting, weft knitting, etc., or woven fabric may be selected as necessary. 1st surface layer is a synthetic fiber layer with a W-shaped cross section, and the back layer is a synthetic fiber layer with a W-shaped cross section. Double-knit using conventional methods to create a synthetic fiber layer with an irregular cross section of 50% or less.

Weave and weave using methods such as double weaving.

The fibers constituting each layer of the fabric of the present invention have their surfaces imparted with water-absorbing properties by hydrophilic processing. As the hydrophilic agent, a polycondensate of polyethylene glycol and terephthalic acid is used for polyester fibers, and a polycondensate of polyethylene glycol and polyamide is used for polyamide fibers. By immersing and treating a fabric in an aqueous solution of these hydrophilizing agents, the unevenly distributed water-absorbing fabric of the present invention in which both the surface layer and back layer of the fabric are hydrophilized to a desired degree can be obtained. In each case, the treatment with these hydrophilic processing agent aqueous solutions was carried out at a treatment concentration of 0.1 to 20% o, w.
, f, It is desirable to carry out the treatment under conditions of a treatment temperature of 80° C. or more and a treatment time of 10 minutes or more. Treatment concentration is 0.1% o, w,
f.

If it is less than 20%, sufficient hydrophilicity and durability cannot be imparted, and even if it is higher than 20% O, W, F, the treatment effect is almost at equilibrium, and the texture of the fabric is rather affected. It tends to get worse, which is not desirable. Also, when the treatment temperature is lower than 80°C or the treatment time is shorter than 10 minutes.

Both are unfavorable because it is difficult to provide sufficient wood parentness and durability.

Hydrophilic processing is carried out after normal scouring and during dyeing.

It may be carried out in any step after dyeing, and the processing equipment may be a normal wince dyeing machine, jet dyeing machine, or beam dyeing machine, depending on the texture, structure, etc. of the fabric.

Alternatively, a Jigger dyeing machine or the like may be selected and used as appropriate.

In the unevenly distributed water-absorbing fabric of the present invention obtained by the above method, sweat generated on the skin on the back surface (the surface in contact with the skin) is absorbed by the layer composed of irregular cross-section fibers with a degree of irregularity of 50% or less, and then the adjacent Water quickly moves to a layer composed of fibers with irregular cross-sectional shapes, retains water, and quickly evaporates there. This means that in a layer composed of fibers with irregular cross-sectional shapes, the spacing between fibers is smaller than that in a layer composed of fibers with irregular cross-sections with a degree of irregularity of 50% or less.1 Rapid water movement due to capillary action. This is due to the water retention capacity due to the surface tension of water and the large surface area per unit fiber (and the large evapotranspiration property due to the nature of essentially hydrophobic synthetic fibers).

(E) Function The unevenly distributed water-absorbing fabric of the present invention has two surface layers composed of surface-hydrophilized synthetic fibers with irregular cross-sectional shapes, and a back layer composed of surface-hydrophilized synthetic fibers with irregular cross-sections having a degree of irregularity of 50% or less. There is.

When the unevenly distributed water-absorbing fabric of the present invention, which has a two-layer laminated structure and is 1ill woven, is used for applications such as underwear and sportswear, it will adhere to the fiber surface of the fiber layer of the skin when sweating when worn. At the same time that water absorption and diffusion begins, the sweat is quickly absorbed by the high water absorbency of the front fiber layer, retained on the front side, and evaporated from the surface.
The fiber layer on the skin side is only slightly wet on the surface, and there is almost no sweat. Therefore, sweat may flow on the skin side, it may become wet and sticky, and it may become clingy.
= I don't feel any discomfort such as slapping.

(f) Examples The present invention will be explained in more detail with reference to Examples. The performance of the fabrics in the Examples was measured and evaluated by the following method.

+11 Cut the knitted fabric of the water absorption performance sample into a size of 10 cm x 10 cm, and with the back side up and the water droplet position floating, add 0.1 mρ of water with a pipette (to make it easier to see the wet state of the water). (Can be colored) from a height of 5 cm.

The wetted area (cJ) of the front and back surfaces is determined 60 seconds after dropping.

(2) Immerse the knitted fabric of the water-retention performance sample in water for 10 minutes to absorb water, then dehydrate it for 20 seconds using the dehydrator attached to a household washing machine. After being left facing up on a wire mesh for 10 minutes, the front and back sides of the 9 knitted fabrics were unraveled and the overlap was measured. After measuring the weight, the disassembled fiber yarn was dried -1,
0- After drying and determining the weight after drying, calculate using a linear formula.

Water retention amount (%) (3) Pilling JIS 1. -1076 Method A (ICT method, 10 hours)
(4) Snagging JIS I, -1058・-・-・・hacksaw method (5:1'
1JI) (5) Feeling of wear Wearing the shirt made into a shirt and performing extreme exercise that causes sweating was evaluated by a sensory test.

(i) Wetting of the skin due to sweat: 〇--Almost never 8-Slightly wet ×-Very wet (ii) Sticky skin: 〇--Almost never △- ...-Slightly clinging
er, and polyethylene terephthalate with a round cross-sectional shape (irregularity degree 0%) was double-twisted on a 24-gauge knitting machine using yarns 75d and 36f, respectively, as the back yarn to form the back side. A smooth knitted fabric was knitted. Next, after scouring by a conventional method, 8%
% o, w, f, treated in an aqueous solution at 130°C for 30 minutes, then washed with water, and dried at 115°C.

The fabric was set at 170° C. for 40 seconds to obtain knitted fabric A, which is a unevenly distributed water-absorbing fabric of the present invention.

For comparison with the present invention, 65% polyethylene terephthalate fiber was used instead of the front yarn and back yarn used in the three examples.
, a blended yarn with a blending rate of 35% cotton fiber.

Comparative knitted fabric B was obtained in exactly the same manner as in the two examples except that a fabric with a thickness of No. 40 was used.

In addition, for comparison with the present invention, one experiment was carried out except that a false twisted bulky yarn of 75 d/36 f of polyethylene terephthalate fiber having a round cross section was used in place of the front yarn and back yarn used in this example. Comparative knitted fabric C was obtained in exactly the same manner as in the example.

The performance of these knitted fabrics was measured and evaluated, and the results are shown in Table 1.

As is clear from Table 1, the water-absorbing fabric of the present invention has excellent water-absorbing performance.9 There is a difference between the water retention rate on the front side and the water retention rate on the back side. Therefore, the sweat adhering to the fibers on the back side is It was quickly transferred to the front side, and the skin side had almost no stickiness or clinginess due to wet sweat, and was extremely comfortable to wear. On the other hand, the knitted fabric B of the comparative example has the same water retention performance on the front side and the back side of 1 and has a slow water absorption rate, and the knitted fabric C of the comparative example has almost the same water retention performance of the front side and the back side of 9. As a result, sweat that adheres to the back side is absorbed into the fibers or is less likely to migrate to the front side.

It was sticky to the skin and clung to the skin, making it uncomfortable to wear.

(G) Effects of the Invention In the unevenly distributed water-absorbing fabric of the present invention, one side layer has excellent water absorption, and the other side layer has excellent water absorption, water retention, and evapotranspiration. If the latter is used as the front side for underwear, sportswear, etc., if sweat adheres to the back side during high temperature and humidity in the summer or during heavy sweating, it will not be absorbed into the fibers. Sweat is quickly absorbed, transferred to the fiber layer on the front side, evaporated, and quickly removed from the skin, which effectively increases the humidity inside the clothing and increases the moisture content on the skin. I was sweating.

It does not get wet or cling to the skin, and provides a comfortable feeling when worn. Furthermore, since each fiber layer is made of synthetic fibers, you can obtain the color of your choice, and it also prevents pilling, which has traditionally been a problem with fabrics using cotton yarn.

The effect is very large because problems such as snagging, poor dimensional stability during washing, and poor fastness are eliminated.

As mentioned above, the fabric of the present invention is laminated with synthetic fibers, so by selecting a hydrophilic treatment agent suitable for the fibers used,
Technically, water absorbency can be easily imparted by simply immersing the material in an aqueous solution of the processing agent.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of a synthetic fiber with a W-shaped cross section used in the unevenly distributed water-absorbing fabric of the present invention, and FIG.
FIG. 2 is a plan view of a nozzle of a spinneret for spinning synthetic fibers having a W-shaped cross-section shown in FIG. 1; Figure 3 shows the degree of irregularity 5 used in the unevenly distributed water-absorbent fabric of the present invention.
It is a sectional view showing an example of synthetic fiber of 0% or less. Patent applicant: Yu-Tei Riki Co., Ltd. - Kunino C Tsujin

Claims (1)

[Claims] (1) Uneven distribution of a two-layer structure consisting of a surface fiber layer made of surface-hydrophilized synthetic fibers with a W-shaped cross section and a back surface fiber layer made of surface-hydrophilized synthetic fibers with an irregular cross-section of 50% or less. Water absorbent fabric.