JP2008069482A - Composite spun yarn - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite spun yarn capable of making woven/knitted fabrics having stretchability and wearing comfortableness and having such properties as crisp feeling and feeling of coolness as well. <P>SOLUTION: The composite spun yarn is such that a core layer of a polyurethane elastic fiber is covered with a sheath layer including a natural bamboo fiber, wherein the blend percentage of the natural bamboo fiber is 40-97 mass%. A method for producing the composite spun yarn is also provided, involving, in general, using a means such as doubling twisting, single covering or double covering. Alternatively, the composite spun yarn can be produced using a fine spinning frame. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a composite spun yarn using natural bamboo fibers.

  Conventionally, spun yarn using natural bamboo fiber is known. For example, Patent Document 1 discloses a blended yarn composed of a split fiber obtained by defibration and splitting bamboo and cotton. Patent Document 2 discloses a blended yarn composed of bamboo fibers obtained by aligning defibrated bamboo materials with a certain fiber length, cotton, and polyester short fibers.

A woven fabric made of these blended yarns has functions such as a crispness and coolness similar to those of hemp, and can be suitably used in the fields of clothing and bedding.
JP 2005-307413 A JP 2006-152503 A

  However, the woven fabric made of the above-mentioned blended yarn has poor stretchability and does not have enough comfort for clothing to sufficiently follow the movement of the body.

  The present invention eliminates the drawbacks of the prior art as described above, and provides a composite spun yarn that can produce a woven or knitted fabric that has stretchability, comfort in clothing, and also has characteristics such as sharpness and coolness. The purpose is to do.

  As a result of intensive studies to solve the above problems, the present inventor believes that polyurethane elastic fibers can contribute to stretchability and clothing comfort of woven and knitted fabrics, and natural bamboo fibers can contribute to sharpness and coolness. It has been found that when polyurethane elastic fibers are contained in the core layer and natural bamboo fibers are contained in the sheath layer, a spun yarn can be obtained that can easily produce a woven or knitted fabric that simultaneously satisfies these characteristics.

  That is, the present invention provides a composite spun yarn characterized in that a core layer made of polyurethane elastic fiber is covered with a sheath layer containing natural bamboo fiber, and the blend ratio of natural bamboo fiber is 40 to 97% by mass. Is a summary.

  According to the present invention, it is possible to provide a composite spun yarn that can produce a woven or knitted fabric that has stretchability and comfort in clothing, and also has characteristics such as a sense of elasticity and coolness.

  Hereinafter, the present invention will be described in detail.

  The composite spun yarn of the present invention is a yarn obtained by coating a core layer made of polyurethane elastic fiber with a sheath layer containing natural bamboo fiber. By using polyurethane elastic fibers, it is possible to impart stretchability and comfort to the woven or knitted fabric, and by using natural bamboo fibers, it is possible to impart sharpness and coolness to the woven or knitted fabric. Among these, the polyurethane elastic fiber can impart the above characteristics to the woven or knitted fabric regardless of whether it is disposed in the core layer or the sheath layer in the composite spun yarn, but the natural bamboo fiber is disposed in the sheath layer. Only the above properties can be imparted to the woven or knitted fabric. Therefore, in the present invention, the polyurethane elastic fiber must be disposed in the core layer, and the natural bamboo fiber must be disposed in the sheath layer.

  As the polyurethane elastic fiber used in the present invention, a commercially available polyurethane elastic fiber can be used. Specifically, “Roika (registered trademark)” manufactured by Asahi Kasei Fibers Co., Ltd., “Lycra (registered trademark)” manufactured by Operontex Co., Ltd. Trademark) ”,“ Espa (registered trademark) ”manufactured by Toyobo Co., Ltd.,“ Mobilon (registered trademark) ”manufactured by Nisshinbo Co., Ltd.,“ Fujibo Spandex (registered trademark) ”manufactured by Fujibo Holdings Co., Ltd. It is done.

  On the other hand, the natural bamboo fiber in the present invention is different from the so-called bamboo rayon fiber. In other words, natural bamboo fibers can be cut naturally, such as true bamboo and Munetake bamboo, and then compressed and defibrated, and bleaching and removing impurities as necessary. Natural bamboo fiber has a hollow portion in the longitudinal direction of the center of the cross section, and can impart a crisp and cool feeling to the woven or knitted fabric. The single yarn fineness of the natural bamboo fiber is preferably 0.9 to 20.0 dtex, and more preferably 2.0 to 10.0 dtex. When the single yarn fineness is less than 0.9 dtex, the strength of the fiber tends to be lowered, and the tension and lower back of the woven / knitted fabric also tend to be lowered, which is not preferable. On the other hand, if it exceeds 20.0 dtex, the spinnability is remarkably lowered and the texture of the woven or knitted fabric tends to be hard, which is not preferable. Moreover, as an average fiber length of a natural bamboo fiber, it is preferable that it is 20-200 mm, and it is more preferable that it is 30-150 mm. If the average fiber length is within this range, the spinnability tends to improve, which is preferable.

  The natural bamboo fibers mentioned above are contained in the sheath layer of the composite spun yarn. The fibers other than the natural bamboo fibers contained in the sheath layer include natural fibers such as cotton, hemp, wool, cashmere, silk, and screws. Examples thereof include regenerated fibers such as coarse rayon, copper ammonia rayon, solvent-spun cellulose fiber, semi-synthetic fibers such as diacetate and triacetate, and synthetic fibers such as nylon, polyethylene terephthalate, polylactic acid, and acrylic. As the form of fibers other than these natural bamboo fibers, short fibers are usually preferable, and the average fiber length is preferably about the same as the natural bamboo fibers from the viewpoint of spinnability.

  The mixing ratio of the natural bamboo fiber in the composite spun yarn of the present invention is required to be 40 to 97% by mass, preferably 40 to 90% by mass, and more preferably 50 to 90% by mass. When the blend ratio of the natural bamboo fiber is less than 40% by mass, the crispness and coolness of the woven or knitted fabric are impaired. On the other hand, when it exceeds 85% by mass, the sharpness becomes too strong, and on the contrary, the texture is impaired.

  Next, as a method for producing the composite spun yarn of the present invention, means such as twisting, single covering and double covering are common, but the composite spun yarn of the present invention can also be obtained by using a spinning machine. it can. Specifically, as a manufacturing method using a spinning machine, first, a raw yarn containing natural bamboo fibers is introduced into a ring spinning machine and passed through a draft area, and at the same time, from the polyurethane elastic fiber to the front roller as the final point of the draft area. Into the yarn (hereinafter referred to as polyurethane elastic yarn). Next, two spun yarns are superposed on the same roller and twisted to obtain a composite spun yarn.

  The composite spun yarn of the present invention can impart excellent stretchability to a woven or knitted fabric. Specifically, in the case of a woven fabric, the stretchability in the direction in which the composite spun yarn of the present invention is disposed is 10.0% as measured by the JIS L1096 8.14.1B method (constant load method). The above is preferable. If the elongation rate is less than 10.0%, the fabric is less likely to follow the movement of the body, and the comfort of the clothes tends to decrease and the skin puncture feeling tends to increase. In other words, natural bamboo fibers are generally thicker than conventionally known natural fibers and tend to increase the feeling of piercing the woven or knitted fabric. However, if the fabric is stretched, the fabric follows the movement of the body. In addition, since the chance of rubbing between the body and the fabric is reduced, the feeling of skin puncture is reduced.

  The woven or knitted fabric using the composite spun yarn of the present invention can be obtained by weaving and knitting the composite spun yarn using a loom, a knitting machine or the like. The yarns constituting the knitted or knitted fabric do not necessarily need to be composite spun yarns, and the composite spun yarns may be used as a part, and may be arbitrarily performed such as knitting or knitting.

  Hereinafter, the present invention will be described with reference to examples. The elongation rate of the woven or knitted fabric was measured according to the JIS L1096 8.14.1B method (constant load method), and the elongation recovery rate was measured according to the JIS L1096 8.14.2B-1 method (constant load method). .

(Example 1)
First, a coarse yarn made of natural bamboo fiber having a single yarn fineness of 4.2 dtex and an average fiber length of 90 mm, and a polyurethane elastic yarn having a fineness of 44 dtex (“Lycra (registered trademark)” manufactured by Operontex Co., Ltd.) were prepared.

  Then, the above-described roving was introduced into a ring spinning machine and sent out to the front roller while drafting at a predetermined magnification. At the same time, the polyurethane elastic yarn is drawn from the outside to the common front roller while being stretched by 2.5 times, the two yarns are overlapped, and then twisted at 20.8 twists / 2.54 cm. A composite spun yarn of the present invention (English cotton count) was obtained. The obtained composite spun yarn had a polyurethane elastic fiber in the core layer and a natural bamboo fiber in the sheath layer, and was excellent in covering properties. The blend ratio of natural bamboo fiber in the composite spun yarn was 80% by mass.

  Next, the obtained composite spun yarn was steam set at 85 ° C. for 20 minutes, and then a 2/2 twill textured machine was woven using the 30th cotton as the warp and the composite spun yarn as the weft. The raw machine was desizing, scoured and bleached, and then preset at 180 ° C. for 1 minute with a pin tenter. Furthermore, after passing through mercerization and dyeing, a pin tenter was used for final setting at 160 ° C. for 1 minute to obtain a woven fabric.

  The warp density of the obtained woven fabric was 154 / 2.54 cm, and the weft density was 70 / 2.54 cm. Further, the stretch rate in the weft direction of the woven fabric was 25.0%, and the stretch recovery rate in the weft direction was 70.0%.

  Furthermore, based on the sensory evaluation, when the clothing comfort, sharpness, and coolness of the same fabric were evaluated, all the properties were excellent.

(Example 2)
Except for changing the thicknesses of the roving yarn and the polyurethane elastic yarn, the composite spun yarn of the present invention of 38th (English cotton count) was obtained in the same manner as in Example 1. The obtained composite spun yarn had a polyurethane elastic fiber in the core layer and a natural bamboo fiber in the sheath layer, and was excellent in covering properties. The blend ratio of natural bamboo fiber in the composite spun yarn was 82% by mass.

  Next, the obtained composite spun yarn was steam-set at 85 ° C. for 20 minutes, and then a knitting machine of a tengu structure was knitted with a single circular knitting machine having a hook diameter of 76 cm and a needle density of 28 / 2.54 cm, After scouring, bleaching, presetting, mercerizing, dyeing and final setting, a knitted fabric was obtained.

  The density of the obtained knitted fabric was 44 wales / 2.54 cm and 50 courses / 2.54 cm. Further, the stretch rate of the same knitted fabric was 140.0%, and the stretch recovery rate was 80.0%.

Furthermore, based on the sensory evaluation, the clothing comfort, the crispness and the coolness of the same knitted fabric were evaluated.

Claims (1)

A composite spun yarn, wherein a core layer made of polyurethane elastic fiber is coated with a sheath layer containing natural bamboo fiber, and the blend ratio of natural bamboo fiber is 40 to 97% by mass.