JPS60259644A - Production of special crimped yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a special crimped yarn, and more specifically, by adding real twist to a thermoplastic synthetic filament yarn and over-untwisting it using a special false twisting condition, the present invention improves gloss. The present invention relates to a method for manufacturing a special crimped yarn t-a that exhibits excellent bulkiness.

Conventionally, crimped yarns that exhibit excellent gloss in processed yarns made of thermoplastic synthetic filament yarns include triangular and pentagonal cross-section yarns that already have excellent cross-sectional shapes and gloss when subjected to false twisting. In some cases, the number of false twists and the setting temperature of the false twist and crimp processing conditions are lower than those of ordinary woolly processing, which can be obtained by a so-called low crimp false twisting method.

The crimped yarns obtained by these methods have superior drapability, supple feel, and gloss compared to ordinary woolly yarns, and are widely commercialized in the field of silky clothing. It is inferior in bulk to . If it is stiff, the residual torque is large and it is easy to cause rippling, which reduces weaving and knitting properties, and increases skew when made of silk.

The present inventors have arrived at the present invention as a result of intensive research in view of these problems, and an object of the present invention is to provide a yarn that has stronger luster and bulkiness than a simple low-crimped yarn. The purpose is to provide a new woven or knitted fabric, the gist of which is to provide a crimped yarn in which a thermoplastic synthetic filament yarn is first twisted and false twist heating is applied in the opposite direction to the first twisting direction. During manufacturing, the number of twists is set to 0.5 x 103 to 6 x 103 ha5 (17 m).
False twist number f 12X103~26xlO3/v'15 (1
7m) A method for producing a special crimped yarn, characterized by processing the yarn at a false twisting temperature of 180 to 220°C, and then subjecting the yarn to relaxation heat treatment at 180 to 230°C.

In the present invention, a crimped yarn can be obtained by a conventionally employed normal false twisting process. In other words, the filament yarn to which the first twist has been added is fed to the feed roller, and the filament yarn is false twisted in the opposite direction to the first twist applied to the filament yarn by a false twisting device with a number of false twists in a specific range, and at the same time, under a specific temperature. Heat setting is performed, followed by heat treatment with a second heater while relaxing with a second roller and third roller, and a special crimped yarn is manufactured by winding it into a paper tube etc.
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To explain in more detail, if the filament yarn to be supplied is a thermoplastic synthetic filament yarn, there are no particular restrictions on the denier or the form of the shield. It is preferable that it is not small, and specifically, 1.5D or more is preferable. As for the cross-sectional form, an irregular cross-sectional form such as a triangular or pentagonal form is preferable to a circular one because it can emphasize the luster. Incidentally, the yarn to be supplied may be a single yarn, or may be a double yarn, for example, by plying and twisting, and the number of yarns is not particularly important.

The number of twists at this time needs to satisfy the following range. In other words, the first twist added to the filament yarn has the effect of converging the crimped yarn and suppressing the occurrence of fuzz, etc., and also aligns the phase of each filament that makes up the crimped yarn, thereby suppressing diffused reflection and obtaining a stronger luster. It is effective. The actual number of first-twisted twists is within a range where residual torque is low and shine is achieved, and the specific number of actual first-twisted twists is 0.5X1.
03~6×10/V/'15 (t/m) is effective, but more preferably 0.5X103~4X103/匈(t/m)
t/m). This er, D(rie, # ('y-
-tvi) f4o? RK, % 'To explain the limited range of over-untwisting false-twisting processing conditions, it refers to over-untwisting false-twisting, false-twisting in the opposite direction to the actual twisting direction of the first twist, but the twist shrinkage due to actual twisting. temporarily returns to its original state (overfeed rate increases), and the false-twisting tension is not as high as normally seen in low-crimp false-twisting, so it is possible to prevent fuzzing and yarn breakage, and improve operability. . In addition, in addition to the false twist crimp of each filament, the yarn aggregate is further crimped due to the actual twisting of the filament, resulting in a coiled yarn form, making it possible to obtain a bulky fabric with elastic resilience. It also leads to improved quality by reducing spots such as sink marks. The number of false twists and the temperature of false twists are involved in cross-sectional deformation and crimp; in other words, in the normal-Lee false-twist range, the higher the false twist number and temperature, the greater the cross-sectional deformation, which impairs the luster effect. If there are many crimps, the phase shift between the filaments becomes large and diffuse reflection increases, resulting in a decrease in gloss. Therefore, the number of false twists and the temperature range of false twists are the ranges that best exhibit appropriate crimp (bulkness) and gloss, and the specific range of the number of false twists found by the present inventors is 12 x 103 ~26 X 103/i (t
/m), and the temperature range was 180-220°C.

The processed yarn obtained by the above processing has excellent gloss and bulk, and can be supplied as is for some textiles, etc., but it can also be used to improve knitting and weaving properties by suppressing the occurrence of frizz. Moreover, in order to stop the skew of the knitted fabric, it is preferable that the yarn is subsequently subjected to a relaxing heat treatment in a second heater zone of a false twisting machine to reduce the torque of the yarn. At this time, the higher the heat treatment temperature, the lower the torque, but at the same time the crimp is also killed, so it is necessary to establish conditions that satisfy both. Therefore, the heat treatment temperature should be determined in conjunction with the number of false twists and the false twist temperature.
Residual torque twist number is 50t15o when processed at 30℃
crn or less, and it was found that there was no occurrence of chattering and the surface of the fabric was made smooth with the brane.

The false twisting device may be of any commonly used spindle type or flick/yong type, and the yarn used may be drawn yarn or undrawn yarn (which results in a stretched false twisting process). When undrawn yarn is drawn and false-twisted, the cross-sectional deformation is somewhat large and the gloss seems to be slightly reduced. The thickness of the yarn suitable for the present invention is 50 to 500D, and it is effective to set it to 75 to 300D even if it is relatively thick.

Next, specific examples will be shown.

Example 1 and Comparative Examples 1 to 5 If the special crimped yarn of the present invention is explained by examples, its characteristic values are as shown in Table 1.As a comparative example, (1) has the number of first twists. (2) has changed the number of false twists, (3) has no relaxation heat treatment after false twisting, (
4) is a normal low-crimp false-twisted material without first twisting, and (5) is a non-pretwisted material with folded crimping false twisting. In addition, the silk fabric is 2
It has nine 0G stitches (interlock), and the residual torque twist number is 21 g/D at L2, where 1 m of sample yarn is collected at the center of the yarn.
This is the number of times the load rotates when a load of 1 is applied and both ends are brought together (unit: t15ocm). The degree of gloss is determined by visual judgment of the knitted fabric. The expansion/contraction recovery rate is JISL1090
According to

Claims (1)

[Claims] A method for producing a crimped yarn in which a thermoplastic synthetic filament yarn is first twisted and subjected to false twist heating in a direction opposite to the first twisting direction, the number of first twists being 0.5 X 103 to 6 X. 103/v'i
5 (t/m) Number of false twists 12×103 to 26×103/
4 (t/m) false twisting temperature 180-220°C (where D is fineness), then the yarn was
A method for producing a special crimped yarn, characterized by carrying out a relaxation heat treatment at 0 to 230°C.