JPS6139415B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for producing fancy yarn, which is suitable for obtaining products from multifilament yarns of ordinary thermoplastic synthetic fibers, which have both a strong silky feel and a soft texture, and also have a richly varied surface structure. In order to obtain knitted fabrics that have a different appearance compared to conventional ones, as a means of producing special crimped yarns with different winding levels in the longitudinal direction of the yarn by a false twisting process,
A method of false-twisting the yarn by intermittently applying water, high-temperature liquid, or thermosetting resin to the yarn before introducing the false-twisting heater, and rotating the intermittent heating device at the same surface speed as the yarn. a method of intermittent heat setting of the strip;
Many methods and related devices have been proposed, including a method of performing false twisting while varying the yarn speed.
All of these conventional yarns have a slimy feel characteristic of synthetic fibers, perhaps because the non-bulky portions have a shape similar to that of raw yarn, and there is a desire for modification and improvement in terms of texture. The present invention was completed in view of such a demand, and has the following configuration. That is, the present invention provides a thermoplastic synthetic fiber multifilament yarn at a temperature higher than the softening point and lower than the melting point of the yarn, at a yarn supply rate (R ₁ −R ₂ /R ₂ ×100, Here, _R1 is the circumferential speed of the supply roller, _R2 is the circumferential speed of the pull-out roller) at least 5% and the first
False twisting is performed to alternately form fused parts and non-fused parts in the longitudinal direction of the yarn, and then a second false twisting process is performed at a temperature at which the non-fused parts do not melt. It is characterized by a large amount of crimp in the part. The most important point of the present invention is to increase the yarn supply rate to 5
% or more, by the first false twisting process, as shown in the drawing, the fused parts 1 and the non-fused parts 2 are formed alternately along the longitudinal direction of the yarn. If the yarn supply rate in the twisting region of false twisting is small, some filaments will appear to be continuously fused, and if this yarn supply rate is less than 5%, the desired yarn cannot be obtained. I can't. On the other hand, in order to increase this yarn supply rate, it is important to set the number of false twists lower than the normal number of false twists; if the number of false twists is high, yarn breakage occurs during processing, resulting in reduced workability. In addition, the lower the number of false twists in the first false twist, the more
The difference in form between the bulkiness of the fused portion 1 and the non-bulkyness of the fused portion 1 is large, and the fancy effect is further exhibited, and from this point of view, it is desirable that the number of false twists in the first false twist is lower than the normal number of false twists. According to our test results 1m
The best results are obtained when the number of false twists per twist is 60 to 90% of the normal number of false twists expressed as T = 29,000 to 32,000/〓 (D: denier). Next, a second false twisting process is performed to increase the crimp of the non-fused portion 2. In this case, the direction of false twisting may be in either direction, but the yarn after the first false twisting is ,
In the fused part 1, the twist in the same direction as the false twist is fixed,
Since the twist in the opposite direction to the false twist remains in the unfused part 2 and the weakly fused part 3 between the unfused part 2 and the fused part 1, the twist in the same direction as the first false twist remains. When the second false twist is performed, the twist in the same direction as the second false twist is fixed in the fused part 1
The filament is further tightened by the second false twist without being loosened, and conversely, the filament is loosened in the weakly fused portion 3 and the non-fused portion 2 where the twist in the direction opposite to the second false twist remains. It will be bulkier than that. For this reason, a yarn with a more excellent fancy effect can be obtained. In addition, when performing a second false twist in a direction different from the first false twist, the fancy effect is slightly reduced, but the result is a yarn with low torque and extremely excellent knitting properties. You can get less product. The fancy yarn produced by the method of the present invention as described above has a strong fused part where the twists are firmly fixed by the fused false twisting and the apparent fineness appears thin, and a nonwoven fabric with high crimpability. Because the fused portions are alternated along the longitudinal direction of the yarn, it is possible to obtain a knitted fabric with a varied surface structure, creating an unprecedented texture that combines a strong and flexible feel. is obtained.
In addition, it does not have the roughness (sticky texture) that was a drawback of conventional false-twisted fused yarns, and has an elegant texture and appearance. Further, the yarn after the first false twisting has a large strength and has excellent workability. Next, examples of the present invention will be described in detail, but the present invention is not limited thereto. Example 1 A 100D/24F polyester filament yarn was subjected to a first false twisting process and a second false twisting process under the conditions shown in Table 1 below to obtain a fancy yarn having the form shown in the drawings. When this yarn was made into a knitted fabric and dyed and finished, the surface of the knitted fabric became uneven, and a product was obtained that had a combination of a strong smooth feel and a soft texture, and had a refreshing feel without a slimy feel.

[Table] Example 2 Using 70D/24F nylon filament yarn, the first false twisting process and the second false twisting process were performed under the conditions shown in Table 2, and the resulting yarn was made into a knitted fabric with a dyed finish. As a result, we were able to obtain a product that has both a smooth feel and flexibility, has a highly varied surface structure, and has excellent tension and stiffness that cannot be obtained with ordinary processed nylon yarn.

【table】 [Brief explanation of the drawing]

The drawing is a side view of a fancy yarn showing an embodiment according to the present invention. 1... fused part, 2... non-fused part, 3... weakly fused part.

Claims (1)

[Claims] 1. A thermoplastic synthetic fiber filament yarn is heated at a temperature higher than the softening point and lower than the melting point of the yarn, and the yarn supply rate (R ₁ −R ₂ /R ₂ ×
100, where _R1 is the circumferential speed of the supply roller and _R2 is the circumferential speed of the pull-out roller. Fancy yarns are formed alternately with fused portions, and then subjected to a second false twisting process at a temperature at which the non-fused portions do not melt, thereby increasing the crimp of the non-fused portions. Production method.