JPS6129738Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application The invention relates to a mixed spun yarn of natural fibers and acrylic synthetic fibers, and more specifically, the invention relates to a mixed spun yarn of natural fibers and acrylic synthetic fibers. It is used in combination and has a two-layer structure,
This invention relates to a spun yarn with good cotton texture and bulkiness. Conventional technology Traditionally, spun yarn has been made from 100% natural fibers,
There are 100% synthetic fibers as well as those that are a mixture of the two, and each type is produced in a variety of ways depending on its use and purpose. Among these, blended yarns of natural fiber cotton and synthetic fibers are uniformly blended in the form of staples or slivers, so although the spun yarns made from these yarns are uniform, all fibers tend to appear on the yarn surface. It was not possible to efficiently arrange only specific fibers on the yarn surface. Furthermore, as a known technique, several methods for obtaining two-layered spun yarns are known, but all of them mainly involve mixing fibers having similar fiber lengths. In the spinning method called short fiber spinning using cotton, the fiber length is 30 mm, which is close to the fiber length of cotton.
Even though it is a two-layer yarn, there is a limit to the difference in fiber length between the two layers, and there is a drawback in that the cotton fibers are placed on the surface of the spun yarn. For example, in Japanese Patent Application Laid-Open No. 49-66927, polyester slivers and cotton slivers with a cut length of 51 mm are fed to a roving machine in a special feeding manner to obtain rovings, whereby the cotton fibers are positioned in the outer layer. An example is described in which a two-layer spun yarn was obtained. Problems to be solved by the invention However, the spun yarn of the above publication is not sufficient as a two-layer structure due to the reasons mentioned above.
It is difficult to utilize the characteristics of cotton as a spun yarn as a whole. In addition, the conventional ring-spun yarn made by blending cotton, which also applies to the one in the above publication, has a short fiber length, so it naturally requires a large number of twists in terms of yarn formation and yarn quality. This has the disadvantage that the spun yarn is restricted and loses its bulky properties, and the supple and soft texture that cotton originally has is offset. Therefore, for these reasons, it has not been possible to obtain the desired cotton mixing effect. Furthermore, those using polyester fibers for the inner layer have drawbacks such as insufficient volume, insufficient lightness, insufficient color development, and darkening when worn. In view of the above-mentioned points, the purpose of this invention is to take advantage of the excellent characteristics of natural fiber cotton, such as softness, water absorption, heat retention, and good texture, and to combine these with the toughness and good texture of synthetic fibers. The object of the present invention is to provide a new cotton-blended double-layer spun yarn that not only has excellent spinnability but also has better bulkiness and softer feel than those made of 100% cotton fiber. Means for Solving the Problems In order to achieve the above-mentioned object, the spun yarn of the present invention is a mixed spun yarn in which the outer layer is mainly made of natural cotton fibers and the inner layer is mainly made of acrylic synthetic fiber staples. The weight mixing ratio of the cotton fibers is within the range of 20 to 70%, the average fiber length of the acrylic synthetic fibers that mainly form the inner layer is three times or more the average fiber length of the cotton fibers, and the acrylic Weight ratio of 20 to 80 among synthetic fibers
This cotton blend spun yarn is characterized in that it contains a boiling water shrinkage rate of 6% or more in the range of 50 to 90, and that the twist coefficient K (metric system) of the spun yarn is in the range of 50 to 90. Function The present invention will be explained in more detail below. The spun yarn of the present invention, as shown in the yarn cross-sectional structure model in the drawing, has cotton fibers mainly arranged in the outer layer 2 of the yarn 1 and acrylic synthetic fibers mainly arranged in the inner layer 3. Has a soft texture,
It takes advantage of its water absorption and heat retention properties. First, the cotton fiber that mainly forms the outer layer is not particularly limited, and may be commercially available cotton fibers produced in America, Egypt, India, etc. As is well known, cotton fiber has an average fiber length of 10 to 40 mm, a fineness of 0.8 to 4.0 denier, and a single fiber strength of 2.0 to 6.0 g/d.
It is common to have characteristic values of . In addition, the synthetic fibers that mainly form the inner layer are
The acrylic synthetic fiber staple is used, and the manufacturing process conditions including the cutting-spinning method are not particularly limited, but the average fiber length must be at least three times the average fiber length of cotton. If it is less than 3 times, cotton will not be sufficiently arranged in the outer layer, which is not preferable. Furthermore, in order to obtain good bulkiness and a clear two-layer structure as a product, shrinkable acrylic synthetic fibers with a shrinkage rate of 6% or more are added to the total weight ratio of acrylic synthetic fibers.
It is used by blending within the range of 20 to 80%. The method for producing the two-layer spun yarn used in the present invention is not particularly limited, and any known method may be used. The mixing ratio of cotton fibers forming the outer layer of the two-layer yarn of the present invention and acrylic synthetic fibers forming the inner layer is 20 to 70% by weight in order to fully utilize the characteristics of cotton. It is necessary to keep the amount within a range of 20 to 50% by weight, especially considering spinnability and strength characteristics of the yarn. In this invention, in order to achieve particularly high bulkiness and a clear two-layer structure, as mentioned above, the acrylic synthetic fiber is mixed with shrinkable staples with a shrinkage rate of 6% or more at a weight ratio of 20%.
If fibers having a shrinkage rate of 6% or more are not used in this ratio, the bulky effect will hardly be produced and the clarity of the two-layer structure will be impaired, which is not preferable. Even if the shrinkage rate is 6% or more, if the shrinkage rate is more than 35%, the yarn will become bulky, and the cotton will tend to fall off from the yarn and product surface. Generally speaking, it is better to avoid using anything exceeding 35%. Furthermore, by using the acrylic composite synthetic fiber in the inner layer fiber within the above range, the bulky-treated yarn can have even better rounded bulkiness and a soft feel. On the other hand, the number of twists is 50 in the twist coefficient K (metric system) in order to bring out the texture of cotton even more.
It is important to keep the value within the so-called sweet range of ~90. Here, the twist coefficient K is expressed as K=number of twists (T/m)/√meter count. If the twist coefficient is less than 50, cotton may fall off from the spun yarn, which is not preferable. Furthermore, if the twist coefficient exceeds 90, the yarn will be restrained by the twist and the softness of cotton will be greatly lost, which is not desirable. In the present invention, since long acrylic synthetic fibers are used, the yarn strength is sufficiently maintained even with the above-mentioned loose twist. The double-layered yarn of this invention has an average fiber length of 10 to 40 mm.
The essence is that the front and rear short cotton fibers are arranged in the outer layer, and the acrylic synthetic fibers having an average fiber length that is three times or more the average fiber length of the outer layer fibers are arranged in the inner layer. It is important that the spinning method be adapted to the average fiber length of the inner layer fibers. Generally, the average fiber length of cotton is 23
If the average fiber length of cotton is 23 mm or more, use a roving frame or spinning frame with a roller gauge of 70 to 76 mm.If the average fiber length of cotton is 23 mm or more, use a long fiber spinning machine (so wool spinning) of 70 to 200 mm.
A roller gauge roving frame or spinning frame can be used. Here, in addition to the various effects of realizing the two-layer structure in the various known two-layer structure spun yarn manufacturing methods mentioned above, in the present invention, compared to the average fiber length of the cotton fibers arranged in the outer layer part, The difference in average fiber length of the acrylic synthetic fibers arranged in the inner layer is particularly large, so when drafting in spinning, cotton fibers are in an extremely floating state compared to acrylic synthetic fibers, and when twisted, located on the thread surface,
On the other hand, the acrylic synthetic fibers, which are controlled by being gripped by drafting rollers, further promote the creation of a two-layer structure. Furthermore, since the spun yarn is soft, the shrinkage of the high-shrinkage acrylic fibers in the inner layer produces a synergistic effect in which the cotton fibers are arranged in the outer layer. Effects of the invention According to the invention as described above, by taking advantage of the excellent characteristics of cotton, a natural fiber, such as softness, water absorption, heat retention, and good texture, the strength and toughness of acrylic synthetic fibers, Combines good spinnability,
Furthermore, a novel two-layer spun yarn having bulky properties and soft properties is provided. The spun yarn of the present invention is optimally used in fields such as socks, tights, and underwear due to its good touch and water absorbency due to the cotton fiber of the outer layer. EXAMPLES The present invention will be specifically explained below using examples. A sliver made of a 1:1 blend of regular acrylic fiber with an average fiber length of 102 mm and 3 denier and highly shrinkable acrylic fiber with a boiling water shrinkage rate of 18%, and commercially available American cotton with an average fiber length of 23 mm. Showa 49-
Using the method described in Publication No. 66927, the weight mixing ratio of acrylic to cotton is 70:30, the metric count is 2/30, and the number of twists is 70:30.
A spun yarn of the present invention having a good two-layer structure with a yield of 330 T/m (twist coefficient K=60) was obtained. This spun yarn was skein-dyed using a rotating bag, and then knitted into a sweater using a 7G flat knitting machine. The product was novel and excellent, having a cotton-like soft feel, good water absorbency, and good bulk. On the other hand, Table 1 further shows the texture evaluation using cotton blend yarn using various combinations of cotton blend ratio, shrinkage rate of inner layer fiber, blend ratio, average fiber length, number of twists, etc. for threads with a count of 1/30 (metric type). The results are shown below. Here, cotton has an average fiber length of 23 mm.
A 32 mm card sliver was prepared, and the synthetic fibers for the inner layer were acrylic, 3 denier regular fiber, high shrinkage regular fiber, and composite fiber with a boiling water shrinkage rate of 8%. This method was used for spinning. As is clear from the results in Table 1, it is difficult to obtain a good two-layer yarn with a cotton blending ratio of 15%, and a blending ratio of more than 70% is unfavorable in terms of spinnability such as breakage of spun yarn. Among those using shrinkable fibers, yarns made with shrinkage percentages of 5% tend to have a slightly softer two-layer structure than others, and tend to have a poorer cotton feel than others. In terms of twist coefficient, when K=40, the spinnability is poor, and when K is greater than 90, a soft cotton feel cannot be obtained. In addition, in Table 1, No. 1, 5, 8, 9,
11, 13, 15, and 17 are comparative examples. No. 1 has a small blending percentage of cotton fiber, No. 5 has a small blending percentage of high shrinkage acrylic fiber, and No. 8 has a small blending percentage of acrylic fiber. No. 9 is a high-shrinkage fiber with a small shrinkage percentage, No. 11 and 13 are with twist coefficients other than those of the invention, and No. 15 and 17 are with a small fiber length difference ratio between cotton fiber and acrylic fiber. It is. 【table】

[Brief explanation of the drawing]

The figure is a model diagram showing the yarn cross-sectional structure of the spun yarn of the present invention. 1: yarn (spun yarn), 2: outer layer (mainly natural cotton fiber), 3: inner layer (mainly acrylic synthetic fiber).

Claims (1)

[Scope of utility model registration request] A mixed spun yarn in which the outer layer is mainly made of natural cotton fibers and the inner layer is mainly made of acrylic synthetic fiber staples, and the weight mixing ratio of the cotton fibers is within the range of 20 to 70%, and the inner layer is mainly made of natural cotton fibers. The average fiber length of the acrylic synthetic fiber to be formed is three times or more the average fiber length of the cotton fiber, and
The acrylic synthetic fibers contain boiling water shrinkage of 6% or more in the range of 20 to 80% by weight, and the twist coefficient K (metric system) of the spun yarn is
A cotton blend spun yarn characterized by having a value in the range of 50 to 90.