JPS5911690B2 - Manufacturing method of stretchable composite yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing stretchable composite yarns containing synthetic multi-filament elastic yarns.

In recent years, core yarns using spandex yarns have a soft feel and moderate elasticity (elongation rate of 20 to 30).
Although it has been used in a wide range of products because of its properties (related to the above), this core yarn has the drawback of extremely low resistance to crushing.

However, if a high number of twists are applied to the core yarn during production so that it can be put to practical use, the core yarn becomes hard to the touch and has reduced elasticity.

The present inventor completed the present invention as a result of various studies on a composite method of continuous multifilament yarn and short fiber material in order to eliminate the drawbacks of the core yarn.

In other words, conventional methods have been provided in which continuous multifilament yarns are opened and then composited with short fiber materials, but even if this method is applied directly to synthetic multifilament elastic yarns to produce composite yarns, such Composite yarns are also inferior to the core yarns in terms of stretchability.

This is because the exposed synthetic multi-filament elastic yarn cannot be opened under the same tension as the core yarn, so it must be opened under low tension.

In other words, synthetic multifilament elastic yarns are not opened unless they are under weak tension, whereas conventional continuous multifilament yarns are opened even under normal tension.

As a result of intensive research on this point, the present inventors opened a synthetic multi-filament elastic yarn under normal relatively weak tension, and stretched it by stretching it between two or more pairs of rollers in the opened state. At the same time, the present invention was completed by focusing on the fact that it is possible to obtain a stretchable composite yarn when layered with a fiber material and heated.

There is also a method of stretching the elastic thread and combining it with other threads.
Since they do not mix together, it is not possible to obtain threads that are soft to the touch.

An object of the present invention is to provide a method for producing a stretchable composite yarn containing a synthetic multi-filament elastic yarn, which has a soft touch and a normal degree of stretchability as described above, and also has excellent resistance to crushing. The purpose is to

Still other objects will become apparent in the detailed description of the invention.

The present invention involves opening a synthetic multi-filament elastic yarn using an electrical opening method or a mechanical opening method, and then gripping the synthetic multi-filament elastic yarn between two or more pairs of rollers in the opened state. 2.0
This is a method for producing a stretchable composite yarn, which is characterized by heating and winding the yarn over a fiber material while giving an elongation of ~4.0 times.

Here, the synthetic multifilament elastic yarn in the present invention means a continuous multifilament yarn made of spandex or polyester multifilament elastic fiber.

Further, as the opening method, either a known electrical opening method (voltage application method, frictional charging method) or mechanical opening method can be used.

In order to impart elasticity to the finished composite yarn, it is necessary to elongate the synthetic multifilament elastic yarn by 2.0 to 4.5 times while layering it with the fiber material. In order to improve the properties, it is necessary to heat the synthetic multi-filament elastic yarn by stacking it with a fiber material in an open state.

When the elongation is less than 2.0 times, stretchability cannot be obtained, and when the elongation exceeds 4.5 times, the synthetic multi-filament elastic yarn tends to break.

Specifically, in order to provide elongation, it is necessary to grip between two or more pairs of rollers, but it is preferable to grip between two pairs of rollers.

Note that elongation here means deformation within elastic limits.

Moreover, a pair here means one consisting of two or more rollers, and the number of rollers in a pair may be increased or decreased depending on the degree of elongation and load.

Fiber materials include natural fibers such as cotton, linen, silk, and wool; regenerated fibers such as rayon and polynosic; semi-synthetic fibers such as acetate, triacetate, and IJ copolymer fibers; nylon, polyester, acrylic, Cut or continuous synthetic fibers such as vinylon, polypropylene, polyvinyl chloride, polyethylene, and vinylidene can be used.

The fibrous material is then laminated in the form of a fleece by drafting rovings or slivers, or in the form of continuous filaments with open synthetic multi-filament elastic yarns.

Note that as the fiber material, natural fibers or regenerated fibers are preferable in order to improve the hygroscopicity of the composite yarn.

Next, the present invention will be explained according to the drawings.

In FIG. 1, the synthetic multi-filament elastic yarn 6 is fed to the electrode 9 via a guide 7.8, and is opened via a guide 11.

Electrode 9 is electrically connected to the positive pole of power supply 10, while the negative pole of power supply 10 is grounded.

The synthetic multi-filament elastic yarn 6 is taken up by the tenth roller 12 in its opened state, and is stretched 2.0 to 4.5 times between it and the front roller 13.

The multi-directional short fiber roving 2 is unwound from the bobbin 1 which is mounted on a creel 3, enters the third roller 4, and passes through the third roller 4,
It receives appropriate drafts between the cradle roller 5 and the front roller 13 to form a fleece, is overlapped with the opened synthetic multi-filament elastic yarn 6, is sent out from the front roller 13, passes through a guide 14, and is wound onto a bobbin 15. taken.

The twist coefficient when winding up is approximately 3.0 in inch units when layered with 7 leases of short fiber roving (usually 4.0 for core yarn).
0 to 4.5) and 2.0 to 2.5 in inches when stacked with continuous filaments.

In order to supply the synthetic multi-filament elastic yarn 6 under particularly low tension, in addition to the vertical feeding method shown in the figure, there is a cross-feeding method in which the cheese of the synthetic multi-filament elastic yarn 6 is actively fed on a rotating roller.

FIG. 2 shows the restoring force when the yarn and core yarn of the present invention were stretched by 100 degrees after hot water treatment.

Example 1 A polyurethane multifilament yarn (45 denier/10 filaments) was electrically opened using the apparatus shown in Figure 1, and superimposed with short fiber yarn (nylon 30, acrylic 70) with an average fiber length of 70. A composite yarn was produced by twisting.

In this case, the elongation applied to the multifilament yarn is 3.5
The number of twists when combined is 330 t/in (twisting coefficient 6
0 metric), and the yarn count is 1/30's.

When we measured the stiffness resistance of the yarn of the present invention and a normal core yarn, as shown in the table below, the stiffness resistance of the yarn of the present invention was comparable to that of a highly twisted core yarn, while that of the knitted fabric. The texture was soft.

It is also clear from this table that the yarn of the present invention has superior crush resistance compared to the yarn obtained by stretching an elastic yarn and combining it with other yarns.

Prepare 10 anti-resistance double yarns by cutting them to a length of 50Cr, fixing one end of each and applying a load of 3001 to the other end, guiding the doubling yarns in a V shape with a needle in the yarn axis direction. Move the needle back and forth at a rate of 60 times/mn, and calculate the number of strokes until the thread breaks.

Example 2 Yarn of the present invention with the same blending ratio of polyurethane filament, nylon, acrylic, etc. (same as the yarn of Example 1)
When these yarns were treated with hot water and stretched 100 inches, the restoring force was measured, as shown in Figure 2.

However, the number of twists in the composite is 1/30's, 330 t/m for the yarn of the present invention, and 600 t/m for the core yarn.
Met.

As is clear from this figure, the yarn of the present invention is better
It can be seen that the restoring force is smaller than that of the core yarn as seen in Japanese Patent No. 26162, so it is highly elastic.

Furthermore, the yarn of the present invention had high elasticity, unlike a composite yarn obtained by stacking open filaments and 7 wreaths.

As described above, according to the method of the present invention, it is possible to obtain a composite yarn that is soft to the touch, highly resistant to scratches, and has more elasticity than ordinary core yarn at a low cost, and is also finer than core yarn. A remarkable effect was achieved in that high-count composite yarns could be easily obtained.

[Brief explanation of the drawing]

The drawings show a specific example of the present invention. FIG. 1 is a perspective view of an apparatus according to the present invention, and FIG. 2 is a graph showing restoring force after hot water treatment. 6...Synthetic multi-filament elastic thread, 9...Electrode,
12...10th-ra, 13...front roller.

Claims (1)

[Claims] 1. The synthetic multi-filament elastic yarn is opened by an electrical opening method or a mechanical opening method, and then the synthetic multi-filament elastic yarn is held in the opened state between two or more pairs of rollers.2. 0-4.
A method for producing a stretchable composite yarn, which is characterized by heating and winding the yarn while overlapping it with a fiber material while giving it 5 times the elongation.