JPH02175942A - Pre-twisted, false-twisted yarn - Google Patents

Abstract

PURPOSE:To provide a pre-twisted, false-twisted yarn comprising bundle portions and bulky portions repeated in the longitudinal direction and having soft hand and excellent bulkiness, for example, by doubling two kinds of filaments having different lengths in a specific real twist coefficient and subsequently subjecting the doubled filaments to a false-twisting process. CONSTITUTION:For example, two kinds of filaments A and B having a length difference of <=10% therebetween are doubled in an average real twist coefficient of 600-7500 and subsequently subjected to a false-twisting process in the same direction as the real twist direction to provide a pre-twisted, false-twisted yarn which comprises bundle portions (a) and bulky portions (b) repeated in the longitudinal direction, the bundle portions (a) having many accumulated twists and the bulky portions (b) having a few twists, and is wholly bent tri- dimensionally to form a torque in the same direction as the real twist.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a first-twisted polyester false-twisted yarn having a novel texture and bulkiness.

(Prior art) In order to give unevenness to the surface appearance of the 1a knitted fabric and obtain a fabric with a strong texture, a single type of filament is subjected to actual twisting, and then temporary twisting in the same direction as the actual twisting direction is applied. There is a so-called first-twisted false-twisted yarn in which the yarn is subjected to false twist I@shrinking in the twist heating direction and torque is applied to the entire yarn in the same direction as the actual twist.

(Problem B to be solved by the invention) A considerable amount of first-twisted false-twisted yarn has been produced because of its unique uneven appearance and fabric with a strong crisp feel, but with changes in fashion. There is now a need to soften the crispness of the texture and to add bulk.

Therefore, in order to meet the demands of this market, the present invention
It is an object of the present invention to provide a novel first-twisted false-twisted yarn that is softer and more bulky than conventional first-twisted false-twisted yarn.

(Means and effects for solving the problem) That is, in the present invention, the bundled portion where a large number of twists are accumulated and the bulky portion where there are few twists are repeatedly present in the longitudinal direction of the yarn, and the entire bundled yarn is bent three-dimensionally. In a filament-pretwisted false-twisted yarn having torque in the same direction as twisting, the bundled yarn is composed of two types of filaments, the average actual twist coefficient is 600 to 7,500, and the yarn length difference between both filaments of the entire yarn is The structure is such that it has a sheath core structure of 10% or less, thereby meeting the above requirements.

Conventional pre-twisted false-twisting processing systems are not composed of two types of filaments, but are composed of a single type of filament, so a sheath core structure cannot be achieved, and they lack softness and bulk. However, the present invention is composed of two types of filaments A and B as shown in Fig. 1, with a difference in yarn length of 10% or less between the two filaments, and as a whole, filament B, which has a longer yarn length, is exposed to the outside. Also, since filament A with a short yarn length is located in the core, bulkiness is obtained, and filament B with a long yarn length is loose, so
It feels soft to the touch. Thread length difference is 10.
If it is more than 0%, when the yarn bundle is handled (textured), the long filaments shift and form a nip, resulting in poor appearance and impairing the ability to pass through higher-order processing, which is not preferable.

On the other hand, if the actual twist coefficient is 7,500 or more, the shifting movement of the yarn bundle will be stopped, but the stiffness will become strong and this will defeat the purpose of the present invention. Three-dimensional bending, which is a characteristic of yarn, is lost, and the fabric becomes less uneven, which is undesirable.

For the above reasons, the first-twisted false-twisted yarn of the present invention has the above-mentioned structure, and is softer and more bulky than the conventional first-twisted false-twisted yarn, and has the same texture as the conventional first-twisted false-twisted yarn. A new pre-twisted, false-twisted yarn that takes full advantage of the characteristics of the yarn can be obtained. Here, the actual twist ratio RK is expressed by the following formula.

K=TX pressure T: number of actual twists/m D2 denier The pre-twisted false twisted yarn of the present invention can be obtained by the following means.

Two types of filaments with different elongation,
For example, select a filament with an elongation of 30% and a filament with an elongation of 60%, and twist them together with an actual twist coefficient of 600 to 7,500, or overfeed a filament with a high elongation over a filament with a low elongation. After that, it is obtained by performing false twisting and crimp processing in the same direction as the actual twisting direction and the false twisting heating direction. Another method is to use filaments with similar elongation, overfeed one side, and then perform false twisting and crimping in the same false twist heating direction as the actual twisting direction. You can get it.

At this time, by changing the combination of single fiber denier and single fiber cross section of both filaments, it is possible to change the feel, firmness, and stiffness.

(Example) Polyester round cross-section bright 75 denier, 36 filaments, elongation 60.0% filament B and polyester round cross-section bright 75 denier, 36 filaments, elongation 29.2% filament A were aligned. Number of twists 2
The yarn was twisted 71 times at a rate of 50 times/m, followed by false twisting and crimp processing under the following conditions.

Model: 5T-6 (manufactured by Mitsubishi Heavy Industries) Spindle rotation speed: 23XlO' times/minute Number of twists: 2,2
00 times/m 1 direction (force and direction) Z Heater temperature 210℃ Feed ratio +2.0% The obtained processed yarn has a form as shown in Fig. 1, with filament A having a short yarn length accounting for the entire length. The filament B, which serves as the core and has a long thread length, is located on the outside and has some slack.
In the yarn-longitudinal direction, a convergent part a in which many twists are accumulated and a bulky part a in which few twists are accumulated exist repeatedly. Further, the processed yarn was untwisted, and the yarn length difference between filament A and filament B was measured and found to be 5.2%.

On the other hand, in order to compare with the polyester first-twisted false-twisted yarn obtained in the above example, a conventional polyester first-twisted false-twisted yarn with a bright round cross section of 150 denier, 72 filaments, and an elongation of 30.1% was used. The filaments were twisted with a Z twist of 250 times/m, and then processed under the above false twisting and crimping processing conditions to obtain a first-twisted polyester false-twisted processed yarn. Its appearance is shown in Figure 2.

In the conventional pre-twisted false-twisted yarn obtained in this way, the bundled part a where many twists are accumulated and the bulky part a with little twist exist repeatedly in the yarn longitudinal direction, and the whole bundled yarn is bent in three dimensions. However, the yarn as a whole does not have a sheath core structure, and both the convergent part and the bulky part have surface filaments like the product of the present invention shown in FIG. There is no looseness in the part.

The polyester first-twisted false-twisted processed yarn according to the present invention obtained in the above example and the conventional polyester first-twisted false-twisted processed yarn described above are woven in a plain weave, and the dyeing and finishing process of a normal polyester processed yarn fabric is carried out. As a result of having technical experts in the field evaluate the texture and bulkiness of both products, it was found that the fabric using the processed yarn of the present invention has a unique feel compared to the fabric using the conventional pre-twisted, false-twisted processed yarn. Soft texture with less
The results showed that the material was soft to the touch) and had a high bulkiness.

(Effects of the Invention) As described above in detail, according to the present invention, filaments having a long yarn length as a whole of the bundled yarn are positioned loosely on the yarn surface, so that fabrics obtained using this processed yarn can be obtained. Compared to conventional products, it has a softer texture with less crispness, and at the same time has more bulk.

[Brief explanation of the drawing]

FIG. 1 is an external model diagram of the pre-twisted false twisted yarn according to the present invention;
FIG. 2 is an external model diagram of a conventional pre-twisted, false-twisted yarn. Explanation of the main parts of the figure A. - Filament B with short yarn length. Filament A with long yarn length. - Converging part b. - Bulky part.

Claims (1)

[Claims] In filament-first-twisted false-twisted yarn, a bundled part where many twists are accumulated and a bulky part with few twists exist repeatedly in the yarn longitudinal direction, and the whole bundled yarn is bent in three dimensions and has a torque in the same direction as the actual twist. , wherein the bundled yarn is composed of two types of filaments, has a sheath core structure with an average actual twist coefficient of 600 to 7,500, and a yarn length difference between both filaments of the entire yarn of 10% or less. Twisted false twisted yarn.