JPS6136105B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a multi-layered spun yarn, and more particularly to a method for producing a multi-layered spun yarn with uniform coverage by providing a staple bundle guiding member and a converging member in the roving process.

Spun yarns with a multilayer structure, especially a core and a sheath, are used for the purpose of improving bulkiness, or for the purpose of imparting various performances to the spun yarn by incorporating fibers with special performance into the core. It has traditionally been manufactured industrially.

Various methods have been tried to produce spun yarn with a multilayer structure, but the method involves supplying multiple staple bundles in a roving process, combining them to create a roving, which is then drafted and twisted. This method is popular because it is easy to operate and does not require special equipment.

However, in this method, there is no special means for positioning one staple bundle in the core part and the other staple bundle in the sheath part, but only by combining them, applying a draft, and twisting them, so it is difficult to achieve a good core-sheath structure. Currently, only composite spun yarns with poor coverage can be obtained. If the coverage is poor, the staple bundles that should be in the core will be exposed on the surface of the spun yarn. In particular, in conventional composite spun yarns, only different staple bundles were used for the core and sheath components, so the core component It has become difficult to achieve the intended purpose due to the exposure of the particles to the surface.

The present inventors have made extensive studies to improve the drawbacks of the prior art, and as a result, have arrived at the following invention.

That is, in the present invention, a staple bundle A serving as a core portion and a staple bundle B serving as a sheath portion are aligned and supplied in a roving process, and the two are combined into a roving yarn, and the roving yarn is drafted and then twisted. In the method for producing a multi-layered spun yarn that is wound with a roving process, a staple bundle guide member is provided in the staple bundle introduction part of the roving process to fix the supply positions of staple bundle A and staple bundle B, and the staple bundle is placed in the draft part. A staple bundle converging member is provided, which has an enclosing part for converging the staple bundle B and a concave part for guiding the staple bundle A on the guide surface, so that the staple bundle B converges the staple bundle A.
This is a method in which both staple bundles are run while being pressed against the guiding surface of the converging member.

In the present invention, the guide member provided at the staple bundle introduction part in the roving process is for the staple bundles A and B.
Although the structure is not particularly limited, it has two trumpet-shaped guide ports as shown in FIGS. 1 and 2, and one
It is preferable that the positions of the sheath component staple bundle B passing through the sheath component staple bundle B and the sheath component staple bundle A passing through the sheath component staple bundle A can be fixed.

The staple bundle convergence member provided in the draft part has a guide surface on which the staple bundle can run in contact with, for example, as shown in FIG. It is preferable to have a structure having a recessed part that can be fixed at the center.

The installation position of the staple bundle convergence member is not particularly limited as long as it is a draft part, but it may be installed at a position slightly shifted from the natural running position of the yarn, that is, so that it presses against the guide surface of the staple bundle convergence member when tension is applied to the yarn. preferable.

By providing the guide member and the focusing member in this manner, the staple bundle B runs against the staple bundle A while being pressed against the guide surface of the collecting member, and by twisting the staple bundle A, the staple bundle B can be twisted to provide excellent coverage. A spun yarn with a multilayer structure can be obtained.

Next, the preferred embodiments of the present invention will be described. First, the staple bundle B of the present invention is composed of one type of staple, and the staple bundle A is composed of a blended staple bundle of the staples constituting the staple bundle B and other staples. It is that you are. That is, the staple bundle B serving as the sheath is made of one type of staple selected from one type of material, for example, synthetic or semi-synthetic fibers such as acrylic, polyamide, polyester, and rayon, or natural fibers such as cotton and wool. On the other hand, the staple bundle A serving as the core is made of blended staples containing at least the same kind of material as the sheath. For example, staple bundle B is polyamide, staple bundle A is a blend of polyamide and acrylic, or staple bundle B is wool, and staple bundle A is a blend of wool, acrylic, and rayon.
Examples include blended textiles, which are preferred embodiments of the present invention. In this way, if the staple bundles in the core and sheath are partially of the same type, even if there is a defective coating and the core is exposed to the surface, the sheath will have the same type of staple as part of the core. Due to the presence of staple bundles,
It can reduce problems such as uneven dyeing. Also, if you want to introduce a very small amount of staple bundle into the core,
It was necessary to handle extremely thin fiber bundles, which caused problems in operation, but as in the present invention, a staple bundle of an appropriate thickness is made by blending it with a staple bundle of the same type as the sheath part, and this is used in the core part. If you do this, there will be no operational problems.

In a second preferred embodiment, the staple bundle A of the present invention is a blended staple bundle containing conductive fibers. Conductive fibers are fibers with an electrical resistivity of 10 to 10 ⁶ Ω·cm, and usually contain conductive substances such as metals and carbon. For example, an acrylic conductive fiber in which a number of other polymers in the polymer forming the fibers are dispersed in the form of strings, and carbon black is uniformly dispersed in the strings of polymer, is a true conductive fiber. Perfect for use in inventions. Conductive fibers are usually colored black, but in the case of the present invention, since the conductive fibers enter the core and are coated, there is less worry that the black color will appear on the surface.
Moreover, a spun yarn having excellent antistatic properties can be obtained.

A third preferred embodiment is one in which the shrinkage rate of staple bundle A is higher than that of staple bundle B in the present invention. The fiber materials of the staple bundle A serving as the core and the staple bundle B serving as the sheath are not particularly limited, and may be different materials such as acrylic and wool, or both may be made of acrylic fiber. However, at this time, the staple bundle A that constitutes the core
It is necessary that B has a larger shrinkage rate than B. For example, if this shrinkage rate is expressed as a hot water shrinkage rate,
It is preferable that there is a difference of at least about 5%. By subsequently heat-treating a spun yarn in which a staple bundle with such a difference in potential shrinkage is layered, only the core staple bundle shrinks, and a spun yarn with high bulkiness can be obtained. Furthermore, since the core portion shrinks better, heat treatment further improves the coverage.

Hereinafter, the present invention will be specifically explained with reference to Examples.

Example 1 A carded sliver made of polyester, 1.5 denier, fiber length 38 mm and a combed sliver of cotton were prepared and fed to a drawing machine to produce three types of slivers.

Sliver A: A polyester sliver and a cotton sliver were drawn together at a ratio of 60:40 and fed to a drawing machine to create a mixed cotton sliver. The process of doubling 8 pieces of this mixed cotton sliver, feeding it to a drawing machine, and drafting it is repeated twice to obtain the thickness.
A sliver A of 2.36 g/m was produced.

Sliver B: Sliver B with a thickness of 2.36 g/m is obtained by repeating the process of feeding eight combed cotton slivers to a drawing machine in a doubling manner and drafting them twice.
It was created.

Sliver C: A polyester sliver and a cotton sliver were drawn together at a ratio of 30:70 and fed to a drawing machine to create a mixed cotton sliver. This mixed cotton sliver is doubled, fed to a drawing machine, and the process of drafting is repeated twice to obtain the thickness.
A sliver C of 2.36 g/m was produced.

First, using the roving frame shown in FIG. The sliver B was drafted while pressing the sliver A into contact with the sliver A to create a two-layered roving 6.
The focusing member 3 has the structure shown in FIG.

Furthermore, a blended roving was produced using the sliver C in a conventional manner.

Using these two types of rovings, finely spun yarns each having a cotton count of 30S were spun.

Furthermore, as a result of dyeing only the cotton of these spun yarns and comparing whether or not the spun yarns had a two-layer structure, it was found that the spun yarns produced by the method of the present invention were dyed cotton fibers, as shown in Figure 3. It was found that many ha appeared on the thread surface. Since the blend ratio of cotton and polyester in both the conventional yarn A and the spun yarn B produced by the method of the present invention is 70:30, the yarn produced by the method of the present invention has a high probability of the presence of cotton fibers on the yarn surface, and is It can be seen that it has a layered structure.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the process of manufacturing the multi-layered spun yarn of the present invention, FIG. 2 is a cross-sectional view of a converging member used in the present invention, and FIG. 3 is a diagram showing the covering effect of the spun yarn. be. DESCRIPTION OF SYMBOLS 1, 2... Staple bundle guide member, 3... Staple bundle convergence member, 4... Draft part, 5... Twisting device, 6... Multilayer structure roving, A... Core staple bundle, B... ... Sheath staple bundle, A... Spun yarn by the conventional method, B... Spun yarn by the method of the present invention.

Claims (1)

[Scope of Claims] 1. A staple bundle A serving as a core portion and a staple bundle B serving as a sheath portion are aligned and supplied in a roving process, and the two are combined into a roving yarn, and the roving yarn is drafted and processed. In a method for producing a multilayer spun yarn that is twisted and wound, a staple bundle guide member is provided at the staple bundle introduction part of the roving process to fix the supply positions of staple bundle A and staple bundle B, and the draft part is provided with the staple bundle guiding member. A staple bundle converging member is provided which has an enclosing portion for converging the staple bundle B and a concave portion for guiding the staple bundle A on a guide surface, and the staple bundle A is pressed against the guide surface of the converging member by the staple bundle B. A method for producing a multi-layered spun yarn characterized by running both staple bundles at the same time. 2. The multilayered spun yarn according to claim 1, wherein the staple bundle B is composed of one type of staple, and the staple bundle A is a blended staple bundle of the staples constituting the staple bundle B and other staples. manufacturing method. 3. The method for producing a multilayer spun yarn according to claim 1, wherein the staple bundle A is a blended staple bundle containing conductive fibers. 4. The method for producing a multilayer spun yarn according to claim 1, wherein the shrinkage rate of the staple bundle A is higher than the shrinkage rate of the staple bundle B.