JPH06287827A - Hygroscopic web - Google Patents

Abstract

PURPOSE:To provide a hygroscopic thin web rich in draping and designing properties, facilitating a flame retardance processing, having a good colorful appearance and suitable for interiors such as curtains, wall cloths, vehicle seat cloths, etc. CONSTITUTION:A hygroscopic web is composed of hygroscopic sheath-core yarns 13 comprising core fibers 11 and sheath fibers 12 and having a difference in hygroscopic degree of >=10% therebetween. Since the core fibers 11 are covered with the sheath fibers 12 and do not appear on the surface of the sheath-core composite yarn, the hygroscopic web 14 having a colorful appearance and a stable shape without causing hygroscopic shrinkage is obtained, even when the core fibers 11 are water-absorbing acrylic fibers (11) substantially not having dyeability and having a dull color tone.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a hygroscopic fabric.

[0002]

2. Description of the Related Art Sportswear and underwear are required to have a sweat-absorbing property that absorbs sweat and releases it to the outside, and curtains and cloth-covered fabrics are required to have a humidity-controlling property that absorbs sweat when it is humid and releases moisture when it is dry. However, the upholstery of a vehicle chair is required to have both a sweat absorbing property and a humidity controlling property for eliminating a stuffy feeling when seated and keeping a constant humidity inside the vehicle. Hygroscopic cloth (hereinafter referred to as hygroscopic cloth)
Has both sweat absorption and humidity control properties, and it is an important quality characteristic factor of cloth used for clothing and interior materials.

JP-A-56-134263 (Japanese Patent Publication No. 63-
56345), JP-A-59-168154 (JP-B-61)
-14269), JP-A-59-21744 (Japanese Patent Publication No. 62-62).
45340), 57-180781 (Act 6)
0-5021), 58-120290 (60-60)
-14776), 59-117689 (Actual public 6)
2-29496), SAIKAI Sho 59-117690 (SHIKKO Shou 62-29497), SHIKAI Shou 59-169384 (SHIKKO Shou 62-29498), SHIKAI Shou 59-169385 (SHIKKO Shou 62-29499), SHIKAI Shou 59-193884
(Actual Public Sho 61-45180), Actual Kai Sho 60-16928
2 (Jun. 1-16782) and the like, as a method for imparting hygroscopicity to a cloth, a woven fabric or a knitted fabric has a multi-layered structure, a hydrophobic fiber is used on the front side and a hydrophilic fiber is used on the back side. The method used is adopted.

As described above, the hydrophilic fiber is used on the back side of the cloth because the hydrophilic fiber absorbed from the skin is covered with the hydrophobic fiber which does not absorb moisture, and the skin does not directly touch the skin, and the cloth has a smooth touch. This is because it comes to give. The use of hydrophobic fibers on the front side and hydrophilic fibers on the back side is in the case of sportswear or underwear where the back side touches the skin. A hydrophobic fiber is used for the front side and a hydrophilic fiber is used for the front side. For pile cloth, Japanese Patent Laid-Open No. 59-36
745 (Japanese Patent Publication No. 2-2981), Shoukai 60-1022
As described in No. 79 (Jitsuko Sho 63-2468), hygroscopicity is imparted by using hydrophobic fibers for the pile on the front surface and hydrophilic fibers for the ground structure on the back surface.

As the hydrophilic fibers, natural fibers such as wool, silk, hemp, cotton, rayon and cellulose fibers are mainly used. As the hydrophobic fiber, various synthetic fibers such as nylon, polyester fiber and acrylic fiber are used.
A method of forming a hygroscopic complex with a cationic hygroscopic agent and an anionic compound to impart hygroscopicity to synthetic fibers is also known (JP-A-56-1189640 and JP-B-61-61).
49427). In addition, acrylic fibers are heat-relaxed after being immersed in an aqueous sulfuric acid solution, or heat-relaxed after depositing a metal hydroxide, or a polymer of acrylonitrile and vinyl monomers is obtained. A method is known in which the added additives are extracted after spinning and heat-relaxed to make the acrylic fibers densely porous to impart hygroscopicity with a moisture absorption rate of 20% or more (Japanese Patent Laid-Open No. 50-50). 29826, JP-A-52-27900, JP-A-53-134921, JP-A-54-68415).

[0006]

In the method of imparting hygroscopicity by selectively using hydrophilic fibers and hydrophobic fibers for the front and back, the cloth is made of a multi-layered structure, which is thin, such as lace curtain fabric. No hygroscopic fabric is obtained, and
Since the weaving structure is limited, it is not possible to obtain a hygroscopic fabric suitable for curtain fabrics and fabric wall coverings that has a good drape property and looks good in design, especially for heavy fabrics that use a large amount of fibers. The more difficult the flame-retardant process becomes, the more difficult it is to obtain a flame-retardant curtain material or flame-retardant cloth wall covering that conforms to the flameproof standard.
Further, in a hygroscopic pile cloth using hydrophilic fibers for the backside fabric, since the surface thereof is covered with a thick pile layer of hydrophobic fibers, the hygroscopic effect due to the hydrophilic fibers of the backside fabric is less likely to occur. Further, as a synthetic fiber having high hygroscopicity, a water-absorbent acrylic fiber is commercially available and is widely used, but the hygroscopic process in the manufacturing process thereof lowers the whiteness of the fiber and causes discoloration, which makes it impossible to dye it in an arbitrary color. Therefore, the application is limited to textile products such as diapers, napkins, rags, filters, etc., which are almost unrelated to the color and design, and cannot be used for clothing fabrics and interior fabrics where the color and coloring of the fibers are important.

Therefore, the present invention is not limited to a specific multi-layered design or woven / knitted structure, is thin and has a good drape property, is easily flame-retarded, and can be dyed in a colorful manner to make a curtain or cloth wall. The purpose is to obtain a hygroscopic fabric suitable for interior materials such as stretched fabric.

[0008]

The hygroscopic fabric 14 according to the present invention has a fiber 1 which is 50% by volume or more of the fiber constituting the core.
1 and a hygroscopic core-sheath yarn 13 having a moisture absorption difference of 10% or more between the fibers constituting the sheath and 50% by volume or more of the fibers 12.

[0009] Here, the "moisture absorption (n%)" is the weight W of the fibers in a state of absorbing water, the difference between the weight W ₀ in the absolute dry state of the fibers (W-W ₀₎ absolute It means the percentage (n = (W−W ₀ ) ÷ W ₀ × 100) divided by the weight W ₀ in the dry state. Further, in the present invention, "50 or more" volume% "of fibers constituting the core or the sheath" means the mixing ratio of the fibers constituting the core or the sheath is not "% by weight", but the specific gravity of the fibers. Means that the value is divided by "weight%" of the fiber. For example, the core is composed of fibers A having a specific gravity of 1.1 and fibers B having a specific gravity of 1.2, and the weight ratio of the fibers A to the core is 70% by weight.
When the weight ratio of the fiber B is 30% by weight, the volume ratio of the fiber A is (70 ÷ 1.1) ÷ (70 ÷ 1.1 +
30 ÷ 1.2) × 100 = 71.8% by volume, and the volume ratio of the fiber B is 28.2% by volume. Thus, in the present invention, the reason why the mixing ratio of fibers is expressed by volume% regardless of weight% is that the fibers have different specific gravities,
Even if the mixture ratio of fibers expressed by weight% is the same, another fiber C having the same moisture absorption rate and different specific gravity as the mixed fiber A but having the same mixture ratio (weight%) as the fiber A is used as the fiber A. This is because, when they are mixed instead, the hygroscopicity of the mixed fiber product changes. Cotton, hemp, wool, silk, rayon, vinylon (including non-acetalized vinylon, low acetalized vinylon) and water-absorbent acrylic fiber commercially available as "water-absorbent acrylic fiber" (hereinafter simply referred to as water-absorbent acrylic fiber). Shows a moisture absorption rate of 10% or more, and they are mainly used for the fibers 11 constituting the core part.
Other common synthetic fibers except vinylon and water-absorbent acrylic fibers have a moisture absorption rate of less than 8%, and they are used for the fibers 12 constituting the sheath. However, when the water absorbent acrylic fiber having a moisture absorption rate of more than 30% is used for the core portion 11, cotton, hemp, wool, rayon or vinylon having a moisture absorption rate of less than 20% can be used for the sheath portion 12. When the fibers 11 forming the core and the fibers 12 forming the sheath are formed by mixing and spinning several kinds of fibers, respectively, the average moisture absorption rate of the entire core 11 and the average of the entire sheath 12 are averaged. 10% difference from moisture absorption
Try to be above. In the present invention, the "average moisture absorption rate (m%)" means that the core portion, the sheath portion, the yarn, the cloth and the like have a specific gravity of d ₁ and an A fiber having a moisture absorption rate of m ₁ % of M ₁ volume% and a specific gravity of Is M ₂ % by volume of B fiber having a moisture absorption rate of m ₂ % and d ₂ and M ₃ % by volume of C fiber having a specific gravity of d ₃ and m ₃ %.
₄ , the D fiber having a moisture absorption rate of m ₄ % is M ₄ volume% and the specific gravity is d ₅
When E fiber having a moisture absorption rate of m ₅ % is M ₅ volume% and is composed of these 5 kinds of fibers A, B, C, D and E, m (%) = (m ₁ × d ₁ × M _{1 + m 2 × d 2 × M} 2
+ M ₃ × d ₃ × M ₃ + m ₄ × d ₄ × M ₄ + m ₅ × d ₅ ×
M ₅ ) / (d ₁ × M ₁ + d ₂ × M ₂ + d ₃ × M ₃ + d ₄
× M ₄ + d ₅ × M ₅ ). Thus, as long as the difference between the average moisture absorption rate of the entire core portion 11 and the average moisture absorption rate of the entire sheath portion 12 is 10% or more, the hygroscopic core-sheath yarn 13 has antistatic property, flameproof property, antibacterial property, and antibacterial property. In order to impart functions such as mold resistance, it is also possible to mix antistatic fibers, flame resistant fibers, antibacterial / antifungal fibers, etc. having a moisture absorption rate of less than 10% in the core portion 11.

The hygroscopic core-sheath yarn 13 comprises all or part of the knitting yarn when the hygroscopic fabric 14 is a knitted fabric, and all or part of warp and weft when the hygroscopic fabric 14 is a woven fabric. In one or both, when the hygroscopic fabric 14 is a pile fabric, it is used for one or both of all or a part of the pile yarn and the ground yarn, and the average moisture absorption rate of the fibers constituting the entire hygroscopic fabric 14 is 8% or more. Try to be. In that case, if the hygroscopic core-sheath yarn 13 used as a part does not cause the moisture absorption rate of the entire fabric 14 to be 8% or more, a yarn formed of hygroscopic fibers other than the fibers 11 constituting the core portion. 15 is mixed, and the average moisture absorption rate of the fibers constituting the entire fabric 14 is 8% by the hygroscopic core-sheath yarn 13 and the other yarn 15 which becomes the hygroscopic fiber.
Try to be above.

In the present invention, the reason why the hygroscopic core-sheath yarn 13 is used is that, firstly, the cloth 11 is covered with the fibers 11 constituting the moisture-absorbing core portion and the fibers 12 constituting the non-moisture-absorbing sheath portion. The second reason is to prevent a sticky feeling from being generated on the surface of the cloth. Secondly, even if the fiber 11 constituting the core portion is lacking in dyeability, the fabric 11 is formed by the fiber 11 of the core portion lacking in dyeability. This is to prevent the dyeability of the whole 14 from being influenced. Therefore, depending on the hygroscopic core-sheath yarn 13 used as a part, when the average moisture absorption rate of the fibers constituting the entire fabric 14 is less than 8%, the fibers are the same as the fibers 11 constituting the core portion. When other yarns are mixed, the above-mentioned object is not achieved. Therefore, the other yarn 15 to be mixed has a fiber (12) different from the core fiber 11 of the hygroscopic core-sheath yarn 13. Use yarn. In this case, the other yarn 15 to be mixed is a core-sheath yarn yarn as long as the sheath portion is composed of a fiber (12) different from the core fiber 11 of the hygroscopic core-sheath yarn yarn 13. Good. It goes without saying that the other yarn 15 to be mixed may be of the same fiber as the fiber 12 constituting the sheath portion of the hygroscopic core-sheath yarn 13. For the above reason, the core fiber 11 of the hygroscopic core-sheath yarn 13 must be covered with the sheath fiber 12 to the extent that it is not exposed on the surface of the hygroscopic core-sheath yarn 13. The volume (volume) ratio of the sheath portion (12) to the whole core-sheath yarn 13 is set to 50 to 80% by volume of the whole hygroscopic core-sheath yarn 13, preferably the whole hygroscopic core-sheath yarn 13. 70 to 80% by volume of the sheath fibers 12 occupy, that is, the core 11 and the sheath 1.
The volume ratio with 2 is 2-5: 8-5, preferably 2-3: 8
Set to ~ 7.

Cellulose fibers such as cotton, hemp, and rayon, which are conventionally used as hygroscopic fibers, and vinylon swell and contract due to moisture absorption. Such swelling-contraction type hygroscopic fibers are used in the core (11). When used, the resulting fabric (1
4) also shrinks due to moisture absorption, for example, when it is used for curtain fabric, it shrinks during washing to have a short dimension, and when it is used for cloth wallpaper, the dimension changes due to the water content in the water-based construction paste applied during construction. When it is used as an interior material of a vehicle, it causes inconvenience such as slackening and wrinkling of the surface depending on the humidity inside the vehicle. Therefore, the hygroscopic fiber 11 constituting the core has a shrinkage rate of less than 2% when it absorbs moisture, does not swell and shrink even when it absorbs moisture substantially, and has a moisture absorption rate of 20% or more, preferably a moisture absorption rate of 30%.
% Or more of water-absorbent acrylic fiber is used.

As such a non-swelling non-shrinkable hygroscopic synthetic fiber, a super water-absorbent acrylic fiber having a moisture absorption rate of 40% or more is widely used in diapers, rags and other cleaning articles and can be easily obtained. It is recommended to use the water-absorbent acrylic fiber for the core fiber 11, and the use of such a water-absorbent acrylic fiber for the core fiber 11 further enhances the practical value of the present invention. This is because the commonly used water-absorbent acrylic fiber is dyed in the process of production and is contaminated due to its stainability and is colored in a dull color, which is unrelated to the design of diapers, napkins, rags, filters, etc. Although the use is limited to textile products and cannot be used for clothing fabrics and interior fabrics that place importance on color developability and design, in the present invention, it is covered with the sheath fibers 12 and does not appear on the surface. Used in the core (11), the sheath fiber 12 can be printed or dyed to make the hygroscopic fabric 14 colorful, and by doing so, the drawbacks of the water-absorbent acrylic fiber can be eliminated and the application spreads. And
Further, by using a normal non-water-absorbing acrylic fiber having a dyeing property for the sheath fiber 12, the hygroscopic cloth 14 made of 100% acrylic fiber can be obtained. Therefore, in the present invention, the fiber 11 that constitutes the core portion of the hygroscopic core-sheath yarn 13 is used.
In principle, the color of the fibers 12 forming the sheath portion is different.

When the hygroscopic cloth 14 is used as an interior material, a backing paper can be attached to the back surface thereof. Further, the hygroscopic cloth 14 may be a pile cloth,
In particular, when it is used as a upholstered fabric or as a vehicle interior material where it is in direct contact with the skin, it is preferable to use the hygroscopic core-sheath yarn 13 as a pile yarn and to form a loop pile. In the hygroscopic pile fabric (14) in which the loop pile is formed by the hygroscopic core-sheath yarn 13 in this manner, the hygroscopic core-sheath yarn 13 is projected to the surface and the contact area with air is large,
The hygroscopic fiber 11 of the core portion easily absorbs moisture in the vehicle or the room when it is humid, and easily releases moisture to the vehicle or the room when it is dry, and functions as a humidity control material for keeping the humidity in the vehicle or the vehicle constant. In addition to having the pile length and making the pile density high, a colorful hygroscopic pile cloth 14 suitable for bath mats, bath towels, diaper covers, hospital bed sheets, etc. can be obtained.

[0015]

INDUSTRIAL APPLICABILITY In the present invention, the hydrophilic fiber and the hydrophobic fiber are not used for the front and back of the cloth, but are used for the inside and outside of the yarn (13) constituting the cloth (14), and the hygroscopic cloth (14) is used.
There is no need to multiplex woven or knitted fabric to obtain
Since the cloth (14) is made hygroscopic, there is no restriction on the woven structure or knitted structure.

Therefore, according to the present invention, (1) a thin hygroscopic fabric 1 suitable for a lace curtain fabric
4, and a colorful and attractive hygroscopic fabric 14 which is suitable for drapes and designs and suitable for curtains and cloth wall upholstery can be obtained. In particular, the hygroscopic fabric 14 can be made thin with a small amount of fibers. Because it can be done, flame-retardant processing is easy,
Flame-retardant / hygroscopic curtain fabrics and flame-retardant / hygroscopic cloth wall coverings that meet flameproof standards can be obtained. (2) A loop pile is formed by the hygroscopic core-sheath yarn 13 and can be used as a humidity conditioner for keeping the humidity inside or inside the vehicle constant, and is suitable for bath mats, bath towels, diaper covers, hospital bed sheets, etc. A hygroscopic pile fabric 14 is obtained. (3) By using the water-absorbent acrylic fiber for the core fiber 11 and the normal non-water-absorbent acrylic fiber for the sheath fiber 12, the hygroscopic fabric 14 having 100% acrylic fiber can be obtained. (4) A non-swelling, non-shrinking, water-absorbing acrylic fiber is used for the core fiber 11, and the shape-stable hygroscopic interior material does not change its dimensions or loose wrinkles due to changes in humidity or washing inside the vehicle ( 14) is obtained. (5) To interior fabric (14) made of water-absorbent acrylic fiber (11) that could not be used in diapers, napkins, rags, filters, etc. that have no dyeing properties and have dull colors and are unrelated to design. Can be used, and its applications are greatly expanded. (6) Even if the fibers constituting the hygroscopic fabric 14 are synthetic fibers, the average hygroscopic rate can be 8% or more, and therefore the hygroscopicity is excellent. Hygroscopic fabric made of 100% cotton made from 100% natural fiber that has the same hygroscopicity, feels good to the touch, feels good to the touch, and can be colorfully dyed and printed, and is highly durable. This is a great advantage in terms of industrial application of the present invention, such as being able to obtain the same.

[Brief description of drawings]

FIG. 1 is an enlarged surface view of a hygroscopic fabric according to the present invention.

[Explanation of symbols]

 11 core fiber 12 sheath fiber 13 hygroscopic core-sheath yarn 14 hygroscopic fabric 15 yarn

Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location D03D 15/00 A 7199-3B 27/00 A 7199-3B D04B 1/14

Claims (15)

[Claims] 1. The average moisture absorption rate of the whole core portion 11 and the whole sheath portion 1
2. A hygroscopic fabric having a hygroscopic core-sheath yarn 13 having a difference from the average moisture absorption rate of 2 of 10% or more. 2. A hygroscopic core-sheath having a difference in moisture absorption rate of 10% or more between 50% by volume or more of fibers constituting the core and fibers 12 of 50% by volume or more of fibers constituting the sheath. A hygroscopic fabric having a yarn 13. 3. The hygroscopic cloth according to claim 2, wherein the fiber 11 constituting the core portion according to claim 2 is a hygroscopic fiber having a moisture absorption rate of 20% or more. 4. The hygroscopic fiber 11 according to claim 3 above.
Is a water-absorbent acrylic fiber having a moisture absorption rate of 30% or more, The hygroscopic cloth according to claim 3, wherein 5. The hygroscopic fabric according to claim 4, wherein the fibers constituting the hygroscopic fabric 14 according to claim 4 have an average moisture absorption rate of 8% or more. 6. The hygroscopic fabric 14 according to claim 4 above.
Is adhered to a backing paper, The hygroscopic cloth according to claim 4, wherein 7. The hygroscopic fabric according to claim 4, wherein the surface of the hygroscopic fabric 14 according to claim 4 is covered with a pile. 8. The hygroscopic core-sheath yarn 1 according to claim 2 above.
3. The hygroscopic fabric according to claim 2, wherein 3 forms a loop pile. 9. The fiber 11 comprising 50% by volume or more of the fiber constituting the core portion according to claim 2 is a hygroscopic fiber having a moisture absorption rate of 20% or more and a moisture absorption shrinkage rate of less than 2%. The hygroscopic fabric according to claim 2, wherein 10. The hygroscopic fiber 11 according to claim 9 above.
Is a water-absorbent acrylic fiber having a moisture absorption rate of 30% or more, and the volume (volume) ratio between the core portion 11 and the sheath portion 12 of the hygroscopic core-sheath yarn 13 is 2 to 5: 8 to 5, 11. The hygroscopic cloth according to claim 9, wherein the colors of the sheath 11 and the sheath 12 are different. 11. The hygroscopic fiber 11 according to claim 9 above.
Is a water-absorbent acrylic fiber having a moisture absorption rate of 30% or more, and the volume (volume) ratio between the core portion 11 and the sheath portion 12 of the hygroscopic core-sheath yarn 13 is 2-3 to 8-7. 11. The hygroscopic cloth according to claim 9, wherein the colors of the sheath 11 and the sheath 12 are different. 12. The hygroscopic fabric 14 according to claim 9 above.
The hygroscopic fabric according to claim 9, wherein the fibers constituting the fiber have an average moisture absorption rate of 8% or more. 13. The hygroscopic fabric 14 according to claim 9 above.
Is adhered to a backing paper, The hygroscopic cloth according to claim 9 above. 14. The hygroscopic fabric 14 according to claim 9 above.
10. The hygroscopic fabric according to claim 9, wherein the surface of the fabric is covered with pile. 15. The hygroscopic fabric according to claim 9, wherein the hygroscopic core-sheath yarn 13 according to claim 9 forms a loop pile.