JPS6152250B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite spun yarn that is made of staple fibers and crimped filament yarns and can have great elasticity.

Conventionally, in stretchable spun fabrics, composite spun yarns in which stretchable filament yarns such as polyurethane fibers are covered with spun yarns have often been used. However, such core-spun yarns require many inefficient manufacturing processes and are high in cost because they are covered using yarn that has been spun once. Furthermore, since the yarn itself already has great elasticity at the time of manufacture, it also has the disadvantage that it is difficult to control the tension during processing steps such as weaving.

In addition, there are various types of composite spun yarns made of staple fibers and crimped filament yarns, but since the staple fibers have a real twist, it has not been possible to obtain composite yarns that can fully utilize the elasticity of the crimped filament yarns. Not yet.

The purpose of the present invention is to improve the drawbacks of such conventional composite spun yarns, to provide a composite spun yarn that can be manufactured efficiently and has great elasticity by heat-treating the manufactured yarn. It is in.

The composite spun yarn of the present invention is mainly composed of staple fibers, and is a spun yarn in which a plurality of substantially twist-free fiber bundles that are bundled together with low restraint of single fibers are twisted together, and the fiber bundles are crimped filaments. It is characterized by containing thread.

The present invention will be described in detail below with reference to embodiments shown in the attached drawings.

FIG. 1 is a schematic cross-sectional view of a single yarn used in the composite spun yarn of the present invention. The fiber bundle constituted by the staple fiber 1 surrounding the crimped filament yarn 2 is substantially untwisted and bundled. In the present invention, the term "bundling in a state where the single fibers are not constrained" refers to a state in which the single fibers are only morphologically organized to some extent and each single fiber is hardly constrained. Specifically, the fibers may partially have binding portions made of wrapped fibers, or may partially have intertwined portions, or may simply be made cohesive by temporary twisting or a rubbing device. Therefore, the single yarns constituting the composite spun yarn of the present invention do not form a complete yarn by themselves,
It is in a state that it cannot be used as a single yarn in subsequent processes.

In the present invention, it is essential that two or more of these imperfect single yarns are twisted together. Due to this top twist, the staple fibers of one single yarn press against the staple fibers of the other single yarn, so that the staple fibers are restrained within the twist yarn, and a complete thread is formed for the first time. In addition, the number of twists needs to be low as described below, because the twists that enter the staple fibers and crimped filaments in the twisted yarn state are low, and the staple fibers in the single yarn state are hardly restrained. , the elasticity of crimped filaments can be utilized in composite spun yarns.

The number of top twists used in the present invention should be the minimum amount necessary to restrain each staple single fiber to the extent that there is no problem with process passability. The filament is also twisted, making it impossible to obtain sufficient elasticity and soft texture. The preferred range of the number of twists is k = 25 to 45 in terms of the twist coefficient of the twist thread,
The number of twists may be half or less than that used in ordinary spun yarns.

(Twist coefficient k = number of top twists (T/m) ÷ √ meters of single yarn ÷ number of doubled yarns) The yarn obtained by adding top twists has some expansion and contraction due to the crimped filament, but the degree of expansion and contraction is small. Therefore, even if the obtained state is subjected to processes such as rewinding and weaving, it can be processed under the same conditions as ordinary spun yarn.

Furthermore, when this yarn is heat-treated in a free state, the crimped filament discovers crimps and shrinks, resulting in a monofilament and low-restriction staple fiber 3, as shown in Figure 2.
A very soft and highly elastic yarn is obtained in which the filament 4 is swollen on the outside of the yarn and the crimped filament 4 is located in the core. Therefore, if a woven fabric is manufactured using the composite spun yarn of the present invention, the woven fabric will shrink by steam treatment in the finishing process, and a woven fabric with elasticity can be obtained.

Regarding the positional relationship between staple fibers and crimped filaments in the composite spun yarn of the present invention, for example, when looking at one yarn constituting a double yarn, as shown in FIG. 3A, the staple fibers surround the crimped filament 5. It is most preferable that the filaments 6 are completely surrounded and the crimped filaments are not exposed on the surface, but the crimped filaments may be adjacent to each other and exposed on the surface as shown in B.

Crimp filaments include ordinary twisted yarns such as woolly yarns, as well as coiled yarns such as "springe yarn" (trademark of Umezu Seni Co., Ltd.), which can be found to have elasticity when heated. Any item can be used, whether or not it has a real twist. Further, the staple fibers are not particularly limited and may be synthetic fibers, chemical fibers, natural fibers, or blends thereof.

An example of the method for manufacturing the composite spun yarn of the present invention explained above is shown in FIG. In FIG. 4, a fiber bundle 7 made of staple fibers is moved by rollers 8, 9, 1.
The crimped filament 11 is drafted by the crimped filament 11 from the roller 10, and is supplied to the converging device 12 together with the crimped filament 11 supplied from the roller 10. This convergence device may be any device that brings the drafted staple fibers together to a certain extent with almost no restriction of each single fiber, and for example, a temporary twisting device, an air entangling device, or the like may be used. The fiber bundle bundled by such a bundler is taken up by a delivery roller 13, and then doubled and wound up.

It is best to feed the crimped filament so that it is located at the nip point of the roller 10, at the center of the staple fiber bundle being drafted.If the crimped filament is fed so that the staple fiber bundle has a certain width, the staple fibers can be wound. The area surrounding the contracted filament increases. Specifically, the staple fiber bundle is preferably supplied by a sliver or two rovings.

Two roving fiber bundles are preferred.

The doubled fiber bundle is then directly twisted by the yarn machine without being wound back. As shown in FIG. 4, the yarn may be produced either by winding a doubled fiber bundle around a cheese and then directly winding it into yarn, or by combining the fibers and then continuously winding them into yarn.

The composite spun yarn of the present invention described above can be produced efficiently at high speed because it can use a converging device such as a temporary twister, and has almost no elasticity until it is heat-treated and has good processability. At the same time, heat treatment provides greater elasticity and
It can provide flexibility and bulkiness.

Example Pill-resistant polyester as staple fiber
Using a blend of 20% 3d x 89mm and 80% wool #64, and using woolly polyester processed yarn 75d-24f as the crimped filament, we used a device whose basic configuration is shown in Figure 4 to produce 1/48Nm. I spun it out, pulled the two yarns together, and wound them up. An air twisting device was used as the focusing device. The staple fibers of the wound yarn are located so that they surround the woolly processed yarn, and there are some binding parts, but the staple fibers are hardly restrained and move easily. It was damp.

This pulled thread is 200T/
The upper twist of mS was added and the thread was wound back around the cheese. The obtained yarn had process passability similar to that of ordinary spun yarn, and there was no concern about the occurrence of wrinkle kineps. When this yarn was steam-set with a skein, the yarn had a high stretch rate of 29.7% and had high bulk.

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view showing an example of a single yarn used in the composite spun yarn of the present invention, FIG. 2 is a schematic diagram showing the state of heat-treated composite spun yarn of the present invention, and FIG. 3 is a schematic cross-sectional view of a single yarn used in the composite spun yarn of the present invention. FIG. 4 is a schematic diagram showing the positional relationship between fibers and crimped filaments, and FIG. 4 is a schematic diagram showing an example of an apparatus for producing the composite spun yarn of the present invention. Explanation of symbols 1, 3, 6... Staple fiber,
2, 4, 5, 11... crimped filament, 12...
...Focusing device.

Claims (1)

[Claims] 1. A spun yarn in which a plurality of substantially twist-free fiber bundles, which are mainly composed of staple fibers and are bundled with low single fiber restriction, are twisted together, characterized in that the fiber bundles include crimped filament yarns. Composite spun yarn.