JPS6314098B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a mixed spun yarn of synthetic fibers composed of at least two components having mutually different properties, in which the fineness and fiber length of the constituent single yarns have a distribution. To provide a method for inexpensively producing spun yarn capable of obtaining animal hair-like knitted fabrics with deep color and bulkiness.

Attempts have been made to use synthetic fibers to create natural fiber-like threads or knitted fabrics since the development of synthetic fibers, and some results have been achieved in the field of silk- or cotton-like fibers. ing.

However, although there have been many proposals in the field of wool-like products, the current situation is that no satisfactory product has yet been obtained. It has been said that it is extremely difficult to make synthetic fibers from fibers such as bikuyuna, which are even more complex.

On the other hand, in recent years, a product called animal hair style has been released, which is a mixture of nylon staples with varying fineness, fiber length, and crimp gloss. However, in this case, the products are manufactured independently and mixed in a subsequent process, which tends to cause uneven mixing, and the manufacturing cost is inevitably high because it requires multiple steps. Ta. Furthermore, when making spun yarns, there was also the problem that conventional spinning processes could not be used, especially for single yarns of 1 denier or less.

Therefore, the inventor of the present invention has developed a method in which the effects of fineness, fiber length, and gloss can be changed in one step, and the conventional spinning process can be used even when the fineness of the single fibers constituting the obtained spun yarn is 1 denier or less. As a result of investigating a method for producing spun yarn with a good mixing condition, we discovered that the objective could be achieved by spinning a composite fiber tow consisting of at least two polymer components, and conducted various experiments. , which led to the present invention.

That is, the present invention provides at least one of the interfaces between the polymers of the components with poor affinity by cutting a composite fiber tow in which at least two components are made of polymers with poor affinity for each other subsequent to or after stretching. This is a method for producing mixed spun yarn from composite fibers, in which the composite fibers are peeled off and at the same time converted into short fibers.

A composite fiber in which at least two components are composed of polymers with poor affinity for each other is melt-spun to form a fiber, then bundled into a tow shape and cut into pieces according to a known spinning method. When the composite fiber is subjected to extreme elongation, some or all of the components with poor affinity are exfoliated and divided into their respective components.

Moreover, since each single yarn is given internal strain by stretching, it has latent shrinkage ability, and when the obtained spun yarn is knitted into a fabric and heat treated, a product with high bulkiness is produced due to the difference in shrinkage. can get. Furthermore, the fineness and fiber cross section of each component after peeling are diverse,
It is possible to provide a difference in dyeability and a difference in gloss, and the mixture of the two is good, so that spots are unlikely to occur. If the separation between the components is not sufficient, they can be almost completely separated by chemical treatment or the like.

To explain the main points of the present invention for obtaining such a spun yarn, the first thing to be applied is the polymer component that constitutes the composite fiber, which is generally a combination of two types of polymers that have poor affinity for each other. Any polymer with fiber-forming ability may be used, but in consideration of versatility, dyeability, thread-spinning properties, etc., polyesters such as polyethylene terephthalate and polyamides such as nylon 6 and nylon 66 are preferred. It is preferable to apply Second, in the present invention, at least a part of the interface between the polymers is peeled off by drawing and cutting the conjugate fiber of two components with poor affinity, so both components need to be exposed on the surface of the fiber. Therefore, it cannot be produced from a composite fiber having a so-called island-in-the-sea cross section, as described in, for example, Japanese Patent Application Laid-Open No. 53-6675. The cross-sectional form of the composite fiber in the present invention is as shown in Figures 1 to 6, in which one component is continuous and the other component is divided into a plurality of parts by one component. Particularly desirable is a bimetal type as shown in Fig. 7, or a form in which each component is divided into a plurality of parts in the cross section as shown in Figs. This is not very desirable as it tends to cause problems like this. In this case, troubles can be prevented by blending one component with the other component or blending a third component. Also,
Simultaneously mixing two or more types of fibers with these cross-sectional shapes is also a useful method, since it is possible to further diversify the fineness distribution and single fiber cross-sectional shape. Furthermore, if composite fibers with these cross-sectional shapes are peeled and split, they become yarns with irregular cross-sections, which can change the gloss effect. It is also possible to provide a difference in gloss.

In addition, three types of polymers with poor affinity for each other may be combined and the three components separated and separated, or two or more types of polymers may be combined and one of the components retains a composite form even after separation. Component-based composite fibers can also be applied.

Thirdly, regarding the case of cutting composite fiber tow, generally after producing drawn tow using a normal process for producing staples, the tow is cut by stretching like Parlock spinning. Alternatively, unstretched conjugate fibers may be collected and stretched using a machine such as a "turbo stapler," followed by stretching and cutting with a breaker bar. can. In this case, it is desirable to set the spinning speed to a high speed, particularly taking into account changes over time of the undrawn yarn and ease of cutting, etc., and it is generally preferable to select a spinning speed of 2500 m/min or more. The sliver thus obtained can be subjected to a pre-spinning process such as gill or bovina, and then spun to obtain a mixed spun yarn by a known spinning method.

Next, referring to the fiber composition of the spun yarn obtained by the present invention, firstly, the fineness distribution can be freely changed.
If a conjugate fiber having the cross-sectional form shown in the figure is used, it will be divided into a large number of thin fibers and a relatively small number of thick fibers.

When analyzing and observing the fineness distribution of natural animal hair, such as angora, it is found that two types of fibers are distributed in a ratio of approximately 9:1: thin fibers of about 1 to 3 deniers and thick fibers of about 10 to 20 deniers. This fiber structure creates a soft texture and a hard surface touch at the same time.

As mentioned above, since the spun yarn of the present invention is made by peeling and splitting using composite fibers, it is possible to produce a yarn having a fiber structure similar to that of Angora.
In addition, in the case of Angora, the fibers are hollow,
It is also possible to form hollow fibers as shown in FIG.

If you want to emphasize a very soft touch, in the present invention, it is easy to mix fiber bundles of 0.5 denier or less, which are not found in natural animal hair, by increasing the number of divisions in the composite fiber cross section or reducing the amount of discharge. This can be dealt with by means of adjustment.

Furthermore, when cutting the fibers into short fibers, a large draft is applied to cut the fibers by stretching, so the cut ends tend to become tapered and thin. Be effective.

Example Using a component in which 0.01% TiO ₂ was added to polyethylene terephthalate with an intrinsic viscosity [η] of 0.62, and a component in which 0.6% TiO ₂ was added to nylon 6 with an [η] 1.1,
In the cross-sections shown in Figures 1 and 2, two types of composite fibers were spun using polyethylene terephthalate as component A and nylon 6 as component B, each individually wound and bundled into a 60,000 denier tow, which was drawn. . In the cross section of Figure 1, one A component part is 1 denier and the B component part is 10 denier, and in the cross section of Figure 2, one A component part is 1 denier.
The discharge amount was adjusted so that the amount of the B component was 0.3 denier and the amount of the B component was 1.2 denier. These two drawn tows are combined so that the ratio of the cross section in Figure 1 to the cross section in Figure 2 is 4/1, and the total is 300,000 denier.
After fiber alignment at a draft rate of 1.20, Kenkiri spinning was performed at a draft rate of 9.60 times. The obtained sliver is spun through a pre-spinning process, and the spun yarn is twisted and knitted into a jersey and chemically treated with n-butanol.
After dyeing, a very bulky angora-like product was obtained.

[Brief explanation of the drawing]

FIGS. 1 to 9 are cross-sectional views showing examples of cross-sectional forms of composite fibers used in the present invention.

Claims (1)

[Scope of Claims] 1. By cutting a conjugate fiber tow in which at least two components are made of polymers with poor affinity for each other, the interface between the polymers of the components with poor affinity can be formed by cutting the composite fiber tow subsequent to stretching or after stretching. 1. A method for producing mixed spun yarn from composite fibers, which comprises peeling off at least a portion of the fibers and simultaneously converting them into short fibers. 2. Producing a mixed spun yarn from the conjugate fiber according to claim 1, in which the fineness of at least one of the individual filaments is 0.5 denier or less when the conjugate fiber is peeled and shortened. Method. 3. Among the components constituting the composite fiber, two polymer components are linear polyester and linear polyamide, respectively.
A method for producing mixed spun yarn from the conjugate fibers described in 2. 4. Claims 1, 2, or 3 in which the composite fiber has a cross-sectional form in which one component is continuous and the other component is divided into a plurality of parts by one component. A method for producing mixed spun yarn from the conjugate fibers described in 2.