JP2003293235A - Composite fiber generating heat by moisture absorption - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a knitted or woven fabric capable of adsorbing and removing sweat, and having excellent heat-generating properties and feeling of a natural fiber, and to provide a spun yarn. <P>SOLUTION: The core-sheath type composite spun yarn generating heat by moisture absorption is obtained by using a natural fiber or a modified natural fiber having heat-generating characteristics by absorbing the moisture at 15% official regain. The core component is preferably wool or cotton fiber having imparted high moisture absorptivity. Preferably, the sheath component is a hydrophilic fiber, especially cotton or a blended yarn comprising a cotton fiber as an essential component. The cloth or clothes having excellent hygroscopicity and properties of keeping temperature by heat generation comprise the core- sheath type composite spun yarn generating the heat by the moisture absorption. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core-sheath type hygroscopic and heat-generating composite spun yarn excellent in hygroscopicity and heat-retaining property, and excellent hygroscopicity and heat-retaining property comprising the core-sheath type hygroscopic and heat-generating composite spun yarn Related to fabric or clothing.

[0002]

2. Description of the Related Art Fibers that absorb sweat in the summer to maintain a comfortable feeling of wear and absorb moisture in the winter to retain heat by heat and clothes knitted and woven using the fibers are becoming popular. In JP-A-9-31796, a core-sheath type hygroscopic exothermic composite spun yarn is used in which a core material is formed from fibers containing highly hygroscopic staples and a sheath portion is mainly composed of hydrophobic staples or hydrophobic filaments. A knitted fabric is disclosed. Here, the highly hygroscopic staple contained in the core material also has a hygroscopic and heat generating property. However, since the sheath part is mainly composed of hydrophobic fibers, when there is a large amount of sweating in the summer, the sweat cannot be absorbed promptly, which causes a problem of discomfort due to accumulation of sweat. . In addition, since the surface is actively composed of hydrophobic fibers in winter, there is a problem that static electricity is easily generated in a dry environment in winter.

In Japanese Unexamined Patent Publication No. 2001-40547, a moisture absorbing / releasing exothermic fiber having an official moisture content of 16% or more, a wool fiber and a hydrophobic synthetic fiber, and a moisture absorbing / releasing exothermic fiber in a weight ratio of 5 to 5 are disclosed.
Using a core-sheath structure yarn with a mixed fiber mixed at a ratio of 0% as a sheath and a long fiber yarn or a short fiber yarn of a hydrophobic synthetic fiber as a core, which absorbs moisture to generate heat and has a long heat generation duration. A fabric using a core-sheath structure yarn in which cellulose fibers are used instead of the hydrophobic synthetic fibers used in the sheath and the fabric that provides a comfortable feeling for a long time is disclosed. The core-sheath structure yarn used here has poor water absorption because hydrophobic synthetic fibers are used for the core material, and when there is a large amount of sweat, there is a problem that a feeling of getting wet and cold due to a wetting back phenomenon occurs. , There is room for improvement.

[0004]

DISCLOSURE OF THE INVENTION The present invention is excellent in heat retention in winter, and in addition to eliminating discomfort caused by sweat in summer, by utilizing the good texture of natural fibers, The present invention provides a knitted fabric having a comfortable wearing feel regardless of the above, and a spun yarn forming such a knitted fabric.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a core-sheath type hygroscopic exothermic composite spun yarn comprising a natural fiber or a modified natural fiber having an official moisture regain of 10 to 19% by weight and having a hygroscopic exothermic property as a core component. In particular, the present invention relates to a core-sheath type hygroscopic and exothermic composite spun yarn in which the above-mentioned core component is animal hair or highly hygroscopic cotton fiber. The present invention further relates to the above core-sheath type hygroscopic and heat-generating composite spun yarn in which the sheath component is a hydrophilic fiber. The present invention particularly relates to the core-sheath hygroscopic exothermic composite spun yarn according to any one of the above, wherein the sheath component is cotton or a mixed yarn containing cotton fiber as a main component. Further, the present invention relates to a cloth or garment which is excellent in hygroscopicity and heat retention due to the core-sheath type hygroscopic heat-generating composite spun yarn described in any of the above.

The core-sheath type hygroscopic and heat-generating composite spun yarn of the present invention is
By having the above structure, the following characteristics can be provided: 1) It has heat retention and heat generation that gives a comfortable wearing feeling in winter.
In particular, the heat generated by the heat-generating core material being wrapped in the sheath is favorably held, and the heat retention performance is maintained. 2) It is suitable as summer underwear because it can absorb sweat well in summer. 3) Since the fiber having a hygroscopic property, particularly cotton which is a natural hygroscopic fiber is used in the sheath portion which is in direct contact with the skin, it has a good comfort (texture) as underwear. 4) Since the core material, especially the sheath component, is a hydrophilic fiber, sweat is absorbed inside the fiber, and there is no feeling of wetting or chilling after absorbing moisture.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The core-sheath type hygroscopic and exothermic composite spun yarn of the present invention comprises a core component of an aggregate of natural animal hair fibers or modified natural fibers having an official moisture regain of 10 to 19% by weight and moisture absorption and exothermic properties. The sheath component is preferably a composite fiber composed of hydrophilic fibers. The present invention is characterized in that a natural or modified natural fiber having a heat-absorbing and exothermic property is used as the fiber constituting the core material. Therefore, in addition to heat generation, for example, natural fibers such as wool and cotton have a lower thermal conductivity than other synthetic fibers, and are characterized by being hard to absorb heat. In addition, since the one having a moisture absorption rate in the standard state of 10 to 19% by weight is used, there is no excessive moisture absorption exceeding 19% by weight, and therefore, there is an advantage that the contact cold feeling is small.

Animal hair fibers originally have a heat-absorbing and heat-generating property, but have a tingling sensation when they come into direct contact with the skin, and even when used as a blended product, their use as underwear is not preferred. However, when animal hair fibers are used as the core material as in the present invention, this drawback is solved,
It is also useful as an underwear by taking advantage of heat absorption by moisture absorption. Also,
Although modified natural fibers (for example, fibers modified from cotton) have a slightly hard texture due to processing even if they are called natural fibers, they also have disadvantages depending on the application and the application is limited, but it is necessary to coat them with natural fibers. The texture is improved by.

As the natural or modified natural fiber having a hygroscopic and exothermic property used as a core component, animal hair or a cotton fiber having a high hygroscopic property is preferable. Particularly preferably, wool of animal hair fiber is suitable in consideration of versatility. The cotton fiber having high hygroscopicity is, for example, JP-A-11-279943.
Hygroscopic fibers and the like described in the publication can be used. Specifically, N- methylol (meth) acrylamide (N-MAM) is 0.3 to 2.5 parts by weight with respect to cotton fibers 100 parts by weight, -COOX (X: H, NH 4 or an alkali metal)
An example is a hygroscopic exothermic cotton fiber in which 5 to 45 parts by weight of at least one water-soluble vinyl-polymerizable compound having a carboxyl group or an amino group represented by are chemically bonded. Such a cotton fiber is obtained by, for example, binding N-methylol (meth) acrylamide to a hydroxyl group of cellulose of cotton fiber in cotton fiber impregnated with an aqueous solution containing N-methylol (meth) acrylamide, and then adding vinyl to the cotton fiber. First to introduce a group
Process, water-soluble polymerization initiator and -COOX (X: H, N
By immersing the fiber obtained in the first step in an aqueous solution containing at least one water-soluble vinyl-polymerizable compound having a carboxyl group or an amino group represented by H ₄ or an alkali metal, and then dehydrating and heating it. The second step of polymerizing the water-soluble vinyl-polymerizable compound with the vinyl group introduced into cellulose as a starting point, and the cotton fiber to which the water-soluble vinyl-polymerizable compound polymer is added, under high humidity conditions or in a wet state. It can be manufactured by the method consisting of the third step of holding underneath, followed by washing with water and drying.

Hydrophilic fibers are preferably used for the sheath component. By using a hydrophilic component, it has an advantage that it has an appropriate amount of water so that static electricity does not easily occur even in a dry environment in winter, and a moisturizing effect on the skin can be expected. Even when a large amount of sweat is sweated in the summer, the sweat is quickly absorbed so that sweat does not cause discomfort, and it can be suitably used as summer underwear. A particularly preferred hydrophilic fiber as the sheath component is cotton. Cotton is a fiber that has a moderate hygroscopic property and has been used as a garment for a long time. Since it is used as a fiber of a sheath component that is in direct contact with the skin, cotton is optimal in terms of texture. Cotton as a preferred fiber of the sheath component means not only cotton alone but also a mixed yarn containing cotton as a main component. As a preferable mixed yarn containing cotton as a main component, a mixed yarn of cotton and acrylic, polyester or the like can be exemplified. Examples of hydrophilic fibers other than cotton that can be used as the sheath component include natural cellulose fibers such as hemp, regenerated cellulose fibers such as rayon, animal hair fibers such as wool, and silk.

However, hydrophilic fibers are preferably used as the sheath component of the core-sheath type hygroscopic and heat-generating composite spun yarn of the present invention, but the use of hydrophobic fibers in whole or in part is not excluded. When hydrophobic fibers are mixed, this has the advantage of improving dimensional stability, or when used in full, has the advantage of retaining tenacity for products in which particularly tenacity is required. Examples of fibers that can be used as the hydrophobic fibers include polyester fibers and acrylic fibers.

The core-sheath type moisture-absorbing and heat-generating composite spun yarn of the present invention is
Several methods are possible and can be produced, for example, as follows. One method is to supply short fibers of the core component and short fibers of the sheath component separately, and then carry out a blended cotton step,
After passing through the carding process, the core component short fibers are placed in the center and the sheath component short fibers are placed on both sides in the drawing process, and then supplied and drafted, and the resulting sliver is subjected to the roving process and spun as it is for spinning. Can be manufactured. As another method, short fibers serving as the core component and short fibers serving as the sheath component are separately fed to the kneading strip to form slivers, respectively, and the core component short fibers are formed in the center and the sheath component short fibers by a roving process. It can be produced by arranging it around it and then supplying it, or by supplying one by one each of the roving yarn of the short fiber of the core component and the roving yarn of the short fiber of the sheath component, and spinning. . Alternatively, the roving yarn of the core component short fibers may be spun in advance, and the spun yarn of the core component short fibers may be supplied from the front roller when the sheath component short fibers are spun.

The core-sheath type hygroscopic and heat-generating composite spun yarn in the present invention does not necessarily require that the fibers of the core component and the fibers of the sheath component are distinctly separated, and the fibers of the core component are present in the sheath portion. May be partially mixed, or conversely, the fibers of the sheath component may be partially mixed in the core portion. It is desirable that at least 80% of the surface area of the outer peripheral portion in the cross section of the core-sheath composite spun yarn is composed of fibers of the sheath component. In the core-sheath type moisture-absorbing and heat-generating composite spun yarn of the present invention, the ratio of the sheath component short fibers and the core component short fibers is preferably 95: 5 to 50:50 by weight, and 9
It is more preferably 0:10 to 70:30.

The core-sheath type moisture-absorbing and exothermic composite spun yarn of the present invention can be processed into a woven fabric or a knitted fabric by using it alone or together with other fibers. These fabrics can be used as clothes centering on underwear by taking advantage of the moisture absorption and heat generation characteristics and texture. It is also suitable for applications other than underwear, such as casual pants, denim, and socks.

[0015]

〔Evaluation methods〕

(1) Moisture absorption and heat generation characteristics of the fabric: sample fabric 5 x 5.5 cm
Cut into pieces, and make a bag so that the dough is completely covered by the temperature and humidity sensor, and dry at 60 ° C. Put hot water of 40 to 50 ° C in a styrofoam box to create an atmosphere of 30 ° C and 90% RH or more. Put the cloth on the temperature / humidity sensor, and keep the humidity on the silica gel sheet in the vinyl bag with the zipper 20%.
Wait until the temperature of the unprocessed material and the temperature of the processed dough become almost the same while adjusting the humidity to below% RH. 40 in a styrofoam box
The temperature-controlled and humidity-controlled sample is rapidly transferred to an atmosphere of 30 ° C, 90% RH or higher prepared by pouring hot water of ~ 45 ° C, and the time-dependent change of temperature for 10 minutes is recorded every 10 seconds.

(2) Wearing performance of cloth: A core-sheath type moisture-absorbing and heat-generating composite spun yarn and an ordinary blended yarn were used as underwear, respectively, and compared with conventional underwear of 100% cotton by 20 wear monitor subjects. The wearing feeling (mainly the skin feel) in each case was evaluated on a three-point scale. Evaluation Criteria for Wearing Performance: ◯: The feeling of wearing is equivalent to that of the conventional product. Δ: There is a tingling sensation or a stiff feeling if conscious. X: There is always a tingling sensation and a feeling of stiffness.

Example 1 Wool fibers (official moisture content 15%) as core components and cotton fibers as sheath components were used at a ratio of 30:70 (weight ratio), and the core sheath of 10th count was prepared as follows. A type moisture-absorbing exothermic composite spun yarn was prepared. The yarn was used to create a denim fabric. [Manufacture of core-sheath type hygroscopic heat-generating composite spun yarn] Cotton as a sheath component is passed through a blended cotton and carding process, and the wool of the core component is made to have a predetermined mixing ratio in the drawing process and the core Arrange cotton sliver and wool sliver so as to have a sheath structure,
A core-sheath type hygroscopic and heat-generating composite spun yarn was obtained through a roving process and a spinning process. [Fabric conditions] Warp: 100% cotton spun yarn 7th weft: 30% wool fiber and 70% cotton 70% cotton core-sheath structure yarn 10th woven structure: warp density = 66 / inch, weft density = 45 / in
ch, 3/1 left twill

Example 2 A wool fiber (official moisture content 15%) as a core component and a polyester fiber as a sheath component were used at a ratio of 30:70 (weight ratio), and a spinning method similar to that of Example 1 was carried out to obtain No. 8 yarn. A core-sheath type hygroscopic exothermic composite spun yarn was prepared. The yarn was used to create a denim fabric. [Fabrication conditions] Warp: 100% cotton spun yarn 7th weft: 30% wool fiber and 70% polyester of this example
Core-sheath structure yarn with 8th woven structure: Warp density = 63.5 yarns / inch, Weft density = 48 yarns / inch, 3/1 left twill

Example 3 Wool fibers (official moisture content 15%) as core components and cotton fibers as sheath components were used at a ratio of 10:90 (weight ratio),
By the same spinning method as in Example 1, a core / sheath type hygroscopic and heat-generating composite spun yarn of No. 30 was prepared. The yarn was used to create 18 gauge milled underwear.

Comparative Example 1 100% cotton 7th and 10th spun yarns were spun by a conventional spinning method. A denim fabric was created using the spun yarn. [Fabric conditions] Warp: 100% cotton spun yarn 7th weft: 100% cotton spun yarn 10th woven structure: Warp density = 66 / inch, weft density = 45 / in
ch, 3/1 left twill

Comparative Example 2 A denim fabric was prepared by using 100% polyester spun yarn of 8% as a weft yarn and 100% cotton spun yarn of 7th yarn as warps, which were spun in a usual spinning process. [Woven fabric manufacturing conditions] Warp: 100% cotton spun yarn 7th weft: 100% polyester spun yarn 8th woven fabric structure: warp density = 63.5 yarns / inch, weft density = 48 yarns / inch, 3/1 left Aya

Comparative Example 3 Cotton / wool fiber spun in a normal spinning process (official moisture regain of 1
5%) = 90/10% by weight of 30 count spun yarn was used to make 18-gauge milling underwear.

The results of the moisture absorption and heat generation test of the fabrics produced in the examples and comparative examples are shown in FIGS. Further, Table 1 shows the results of the wearability test of the underwear made in Example 3 and the underwear made in Comparative Example 3.

[0024]

[Table 1]

[0025]

EFFECT OF THE INVENTION The core-sheath type hygroscopic and exothermic composite spun yarn of the present invention is excellent in heat retention since it generates heat due to moisture absorption, and is useful as clothing for winter, and the surface of the yarn is mainly hygroscopic such as cotton. Since the fiber is used as a sheath component, in addition to quickly absorbing and removing summer sweat from the skin, it is also suitable for summer underwear due to its soft touch.

[Brief description of drawings]

FIG. 1 is a graph showing the results of moisture absorption and heat generation characteristics of Example 1 and Comparative Example 1.

FIG. 2 is a graph showing the results of moisture absorption and heat generation characteristics of Example 2 and Comparative Example 2.

FIG. 3 is a graph showing the results of moisture absorption and heat generation characteristics of Example 3 and Comparative Example 3.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Megumi Uenishi             Kurashiki, 2558 Ko, Kanonji-cho, Kanonji-shi, Kagawa             Spinning Co., Ltd. Kannonji factory (72) Inventor Susumu Katsuen             2-3-4 Kutaro-cho, Chuo-ku, Osaka-shi, Osaka Prefecture             Issue Kurashiki Spinning Co., Ltd.Osaka headquarters F-term (reference) 3B028 DA00                 3B029 HA01 HB01 HB02                 4L036 MA05 MA09 MA10 MA35 MA39                       PA21 PA31 RA24 UA25

Claims (5)

[Claims] 1. A core-sheath type hygroscopic exothermic composite spun yarn comprising a natural component or a modified natural fiber having an official moisture regain of 10 to 19% by weight and having a hygroscopic and exothermic property as a core component. 2. The core-sheath type hygroscopic exothermic property according to claim 1, wherein the natural fiber or modified natural fiber having an official moisture regain of 10 to 19% by weight and having heat absorption and exothermic properties is animal hair or cotton fiber having high hygroscopicity. Composite spun yarn. 3. The core-sheath hygroscopic exothermic composite spun yarn according to claim 1, wherein the sheath component is a hydrophilic fiber. 4. The core-sheath hygroscopic exothermic composite spun yarn according to claim 1 or 2, wherein the sheath component is cotton or a mixed yarn containing cotton fiber as a main component. 5. A cloth or garment excellent in hygroscopicity and heat retention, which is formed of the core-sheath type hygroscopic and heat-generating composite spun yarn according to any one of claims 1 to 4.