JPS60181332A - Production of composite-layered structural yarn - 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 method for producing a multi-layer structured yarn, and in particular to a method for producing a multi-layer structured yarn with less yarn unevenness and less uneven coating.

<Relationship with conventional technology> In recent years, various so-called two-layer structure yarns, in which a group of staple fibers in the core is covered with staple fibers in the sheath, have been developed in a variety of ways because they can fully exhibit the characteristics of both staple fibers. There is. For example, by using cotton fiber as the staple fiber in the sheath and polyester fiber as the staple fiber in the core, the front gate of the yarn can be made to have a cotton-like texture, while the polyester staple fiber in the core can make the yarn stronger. However, since the characteristics of the staple fiber in the core are different from those in the sheath, draft unevenness occurs when the roving is drafted by a spinning machine, resulting in yarn unevenness. There was a problem that the uniformity of the thread was impaired due to the large number of threads. On the other hand, a method has been proposed in which the core staple bundle is pressed against the guiding surface of the bundle member using the staple bundle in the sheath part, and the two are combined into roving yarn and then spun yarn (
(See Japanese Patent Application Laid-Open No. 56-51835). However, in this method, the staple bundle of one sheath presses against the staple bundle of the core part and makes it into roving while running, so in addition to N unevenness, draft unevenness occurs in the spinning machine and thread unevenness occurs. It had the disadvantage that only a large amount of yarn could be obtained.

<Object of the invention> The purpose of the present invention is to eliminate the drawbacks of conventional two-layer structure yarns and provide a method for producing multi-layer structure yarns that have the characteristics of a two-layer structure but have less thread unevenness and less coverage unevenness. do.

<Configuration of the Invention> In order to achieve the above object, the present invention has the following configuration. That is, the present invention provides 1. A sliver that becomes one sheath in a method in which another staple fiber group A is superimposed on the central part of the sliver B that is being drafted, and both are drafted together to form a roving, and then to become a spun yarn. B is 1
The other staple fiber group A, which constitutes the core part, is composed of staple fibers A, which constitute the sliver B, and other staple fibers A, and is characterized in that it is composed of staple fibers C, which are a blend of the staple fibers A, which constitute the sliver B, and other stable fibers. This is a method for producing multilayer yarn. The present invention will be described in detail below. In the present invention, one sliver B is overlapped with another staple fiber group A at the center of the sliver B which is being drafted, and the two are drafted together to form a roving. This is because the staple fiber group A is used as the sheath part and the other staple fiber group A is used as the core part. In this way, a multi-layered yarn can be obtained. - Sliver B, which becomes the sheath, is composed of one type of stable fiber A,
The other staple fiber group A may be composed of a blended stable fiber C of staple fiber A constituting the sliver B and other staple fibers C, which together with the multilayer structure may reduce yarn unevenness. A multi-layered yarn with less uneven coverage can be obtained.

It is important that one type of stable fiber A constituting the sliver B in the sheath part is included in the other staple fiber group A that forms the core, thereby controlling draft unevenness and, in turn, reducing yarn unevenness. Moreover, it leads to less covering spots.

If the other staple fiber group A, which will become the core part, is placed on the lower side, and the other staple fiber group A, which will become the lower core part, is pressed against and run by the sliver B, which will be the sheath part, the coverage will be slightly uneven. Although the draft unevenness is not well controlled, it does not lead to a reduction in yarn unevenness.The reason for this is not clear, but even when running with pressure, it is difficult for the material in the sheath to blend in with the material in the core. This is thought to be due to the draft being received while the and sheath part are separated.

Next, the sliver B of the present invention is composed of one type of staple fiber A. For example, as stable fiber A, 1
The fibers are selected from natural fibers such as cotton fibers, wool fibers, recycled fibers, semi-synthetic fibers, synthetic fibers, etc. On the other hand, the other staple fiber group A in the core portion is composed of at least the same type of material as the sheath portion, that is, a blended stable fiber group A containing staple fibers A. For example, if the staple fiber of sliver B that is one core part is cotton fiber, one core part is a blended stable fiber 1 of cotton fiber and staple fiber of polyester fiber, or if the staple fiber of the sheath part is polynosic fiber. Examples include stable fibers in which the staple fiber in the core is a three-way blend of polynosic fiber, polyester fiber, and acrylic fiber.
Differences in fiber properties such as fineness, fiber length, cross-sectional shape, etc. shall not be considered. In other words, when long cotton fibers are used as the staple fibers in the sheath, and the staple fibers in the core are a stable fiber blend of short cotton fibers and polyester fibers, the staple fibers become one material. is preferably 10 to 35% by weight, more preferably 10 to 33% by weight, based on the entire core. This is to reduce draft unevenness, reduce yarn unevenness, and further reduce coating unevenness. If it is less than 10% by weight, draft spots tend to occur, and the degree of coverage does not increase and the coverage spots do not decrease.On the other hand, if it exceeds 35% by weight, the core/sheath part, which is a characteristic of the tangent structure yarn, will deteriorate. It is easy to make full use of the characteristics of staple fibers.

<Effects of the Invention> As described above, according to the method of the present invention, a multilayer structure yarn that has the characteristics of staple fibers of both the core and sheath parts, has less uneven coverage of the core part by the sheath part, and has less yarn unevenness. ◇ Example polyester fiber staple fiber (1.4 denier,
A sliver (120 gel/6-) with equal length fiber length 38III) and a combed sliver (108 gel/6F/J) of cotton fiber (average fiber length 28 m, 1.7 denier) were prepared, and a sliver of polyester fiber was prepared. and cotton fiber sliver in various proportions to produce a blended sliver, and between the back roller and third ruler of the roving machine, the center part of the cotton fiber sliver (No. 21 gelen/6-) in the sheath part is spun. Note that the draft of one roving frame is 9 times (brake draft is 1.3 times)
Met. This roving was spun using a spinning machine to produce a multilayer structure yarn of SO'A (English cotton count), and its physical properties and knitted fabric were evaluated. The results are shown in the table.

In addition, in the table, 8 means polyester fiber, C means cotton fiber, and the mixing ratio is heavy! means i%. Experiment number i, Bs
8.9 is a comparative example, of which only Experiment No. 8 was made by running the sheath while pressing against the core, and the other conditions were the same as Experiment No. 7. From this table, it was found that the yarns of the present invention (Experiment No. 3S4.6.6.7) had fewer yarn irregularities, less yarn count variation, and better yarn uniformity. z 611φxzea rubber tM (lip +
A sensory test was conducted by 10 people who looked at the silk fabric before and after dyeing with 1xl), and found that the fabric of the present invention had good coverage and less N spots. For dyeing, the cotton fiber side was single-sided dyed with indigo liquid. In the table, Q indicates excellent quality and Δ indicates fair quality.

Patent applicant: Toyobo Co., Ltd.

Claims (1)

[Claims] In the method of overlapping another staple fiber group A in the center of the sliver B that is being drafted and drafting them together to form a roving, and then making a spun yarn, the sliver B that becomes one sheath is one type of staple. A koji layer structure characterized in that the other staple fiber group A, which is composed of the fiber A, and which becomes the core part, is composed of a blended staple fiber of the stable fiber A that constitutes the sliver B and other staple fiber fields. How to make yarn.