JPS62276036A - Production of bulky processed 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 3. Detailed Description of the Invention (Field of Industrial Application) The present invention is directed to a woven or knitted fabric in which filaments of different crimped shapes are mixed and have S, Z alternate twisting. The present invention relates to a method for producing a bulky textured yarn that can provide a textured yarn with a richly varied appearance and that is stable against external forces using a single processing weight.

(Prior art) It is known that when a thermoplastic synthetic fiber yarn that is uniform in the longitudinal and cross-sectional directions is subjected to normal false twisting and crimp processing, a processed yarn with high elasticity and bulkiness can be obtained. well known. However, in this processed yarn, the filaments constituting the yarn have similar crimped shapes, and the appearance of the fabric obtained from such processed yarn is monotonous. In addition, when multiple yarns are false-twisted and crimped by aligning them or changing the feed rate, a false-twisted yarn consisting of filaments with crimped shapes and yarn length differences is obtained, and this false-twisted yarn is usually Although it has a spun-like texture that is different from that of the false-twisted yarn, it has the disadvantage that some of the constituent filaments tend to shift or separate due to ironing during the false-twisting and crimping process or during the weaving and knitting process.

(Problems to be Solved by the Invention) The present invention solves the above-mentioned conventional drawbacks, and includes:
The purpose is to provide a method for producing a bulky textured yarn that can give a woven or knitted fabric a richly varied appearance and is stable against external forces such as ironing during the weaving and weaving process.

(Means for Solving the Problems) As a result of intensive research, the present inventors have found that by providing a crimped shape and yarn length difference between filaments through relaxation heat treatment and intermittent twisting, the present inventors can create a woven or knitted fabric. The present invention was achieved by discovering that it is possible to obtain a bulky textured yarn that can provide a variety of external appearances and is stable from the outside.

That is, in the present invention, thermoplastic synthetic fiber multifilament yarn is subjected to relaxation heat treatment, and then heated intermittently in the same direction or alternately in different directions while being heated by a false-twisted body.

The gist of this invention is a method for producing a bulky textured yarn characterized by providing two alternate twists.

Hereinafter, nine aspects of the present invention will be described in detail.

First, in the present invention, thermoplastic synthetic fiber multifilament yarn is subjected to relaxation heat treatment.

When the multifilament yarn is subjected to a relaxing heat treatment, the multifilament yarn shrinks, and the individual filaments constituting the multifilament yarn shrink non-uniformly in the longitudinal direction. In other words, when multifilament yarn is heat-treated in a relaxed state, it begins to shrink from the parts with unstable structure, and shrinkage is delayed in parts with relatively stable structure, resulting in uneven thickness of the threads and non-uniform fiber structure. .

The relaxation rate of the multifilament yarn during the above relaxation heat treatment is:
The content is preferably 10% or more. If it is less than 10%, the yarn may not shrink sufficiently, and it may not be possible to give the yarn sufficient uneven thickness or non-uniform fiber structure.
It may also be difficult to effectively create a crimp difference or a yarn length difference by a twisting operation using false twisting, which will be described later.

The heat treatment temperature during the relaxation heat treatment varies depending on the type of yarn, yarn speed, length of the relaxation heat treatment heater, etc. 2 For example, in the case of highly oriented polyester undrawn multifilament yarn described below, it is approximately 130°C to 240°C. It is preferable. Moreover, the tension of the yarn is preferably 0.1 g to 10 g.

Furthermore, as the relaxation heat treatment apparatus, it is preferable to use a non-contact type apparatus.

If a non-contact type device is used, shrinkage can be performed without contact friction due to running of the yarn.

Next, in the present invention, a multifilament yarn consisting of structurally non-uniform filaments that has been subjected to relaxation heat treatment is heated intermittently in the same direction or alternately in different directions using a false twisting body. Heat to give S and Z alternating twists.

When heating in different directions alternately, heating may be performed alternately and intermittently in different directions.

Here, as the false-twisted body, a twisting nozzle using compressed fluid is preferably used. Hereinafter, a case will be described in which a compressed fluid twisting nozzle is used as the false twisting body, but a spindle type or the like may also be used.

When compressed fluid is supplied to the above nozzle, the yarn is heated in a predetermined heating direction 2, for example Z, in the heating zone before passing through the nozzle.
=5- Torsional deformation from the false-twisted body is applied to the yarn which is twisted in the direction and has uneven shrinkage spots developed by the relaxation heat treatment. Next, when the supply of fluid is stopped, the twist fixed in the heating zone passes through the untwisting zone after passing through the nozzle without being subjected to an untwisting action, and a two-twisted portion having a twist in the heating direction is pulled out. Next, when the supply of fluid is stopped, the heated twist of the yarn passing through the untwisting zone decreases, but when the supply of fluid is restarted, it is subjected to a rapid untwisting action in the untwisting zone. The S-twist portion having twist in the untwisting direction is pulled out. The S, Z, and twist portions are heated and untwisted because the filaments with different crimped shapes are mixed together, so that the twisted portions are wound in a fine loop shape. Further, the non-twisted portion is drawn out in the section from the Sfi section to the Z-twisted section and the section from the Z-twisted section to the S-twisted section, thereby enhancing the bulking effect.

In addition, when heating alternately and continuously in the S and Z directions, in addition to changing the heating direction of one false-twisted body.

Heating may be performed using two or more false-twisted bodies that heat in different directions along the running direction of the yarn.

The above-mentioned false-twisting body is used to conduct a twisting operation (heating is performed intermittently in the same direction or alternately in different directions).
Hereinafter, the degree of torsional deformation in the longitudinal direction of the yarn is varied by the unsteady twisting operation.
This results in different elongation of individual filaments against deformation.

The yarn length difference and crimp difference between filaments are given.

Furthermore, by the unsteady twisting operation described above, S
, Z alternating twist is applied. As a result, bulkiness is provided due to the yarn length difference and crimp difference, and in addition, appropriate cohesiveness is provided, making it difficult to unravel and making it easy to handle.

In the present invention, the thermoplastic synthetic fiber multifilament yarn has a birefringence Δn of 20×101 to 80
X10-'' polyester highly oriented undrawn yarn can be used. Such highly oriented undrawn polyester yarn has a high heat shrinkage rate of 1, for example, about 70%, so it has extremely high shrinkage unevenness during relaxation heat treatment. A large difference in yarn length and crimp is created between the filaments by the subsequent unsteady twisting operation.In the present invention,
It is preferable to use a multifilament yarn having such a high heat shrinkage rate. In the present invention, one multifilament yarn or two or more multifilament yarns may be used. When using two or more multifilament yarns, at least one yarn is subjected to relaxation heat treatment, and the other yarns are not subjected to relaxation heat treatment, but are pulled together and heated by a false twisting body. Good too. When the yarn having shrinkage spots that has been subjected to the relaxation heat treatment and the yarn that has not been subjected to the relaxation heat treatment are aligned and heated, an unsteady twisting operation is performed using a false twisting body.

Non-uniform torsional deformation is applied to yarns that are uneven between filaments or in the longitudinal direction of filaments that have been subjected to relaxation heat treatment. Together with the difference in stretchability, it is possible to obtain yarns with even larger differences in yarn length and crimp. Furthermore, in this case, S, Z
The degree of alternate twisting is different from that of a single thread, and provides effective cohesiveness without twisting.

Further, in the present invention, a multifilament yarn made of two or more types of filaments having different heat shrinkage rates may be subjected to a relaxing heat treatment, and then subjected to an unsteady twisting operation using a false twisting body. Namely.

When a multifilament yarn containing a mixture of two types of filaments, high-shrinkage filaments and low-shrinkage filaments, is subjected to relaxation heat treatment to shrink,9 and then subjected to the unsteady twisting operation described above, shrinkage spots occur in the high-shrinkage filaments themselves. Due to twisting and deformation, the filament becomes a filament with uneven elongation characteristics, such as areas where it is easy to stretch and areas where it is difficult to stretch. Since there is a difference in yarn length, when the false twisted body undergoes torsional deformation, the low shrinkage filaments are selectively located on the outside, the high shrinkage filaments are located on the inner layer, and the high shrinkage filaments and A large crimp difference occurs between low shrinkage filaments.

A bulky textured yarn with extremely large differences in yarn length and crimp is formed. Furthermore, in this case as well, as a result of the unsteady twisting operation, S and Z alternating twists are imparted to the yarn.

A yarn is formed that has appropriate cohesiveness and is easy to handle.

Furthermore, a multifilament yarn in which filaments having different contractility are intertwined can also be used as the supply system. In this case, since a yarn length difference occurs between the interlacing points of the yarn, the yarn length difference is restricted between the interlacing points.

By changing this interval, bulkiness can be controlled.

The yarn obtained by the method of the present invention has differences in yarn length and crimps in each filament due to the relaxation heat treatment and the unsteady twisting operation, so that the filaments with short yarn lengths have fine crimps. It has an S, Z alternating twist in which a long filament has a core and a long filament has a coarse crimp in a sheath shape and is wound in a fine loop shape. As described above, the yarn obtained by the method of the present invention has a multilayer structure with a core-sheath structure by winding the filaments having a difference in yarn length and a difference in crimp into a fine loop shape, so that it has a volumetric feel. It has lO-. Furthermore, since the coarsely crimped filaments are located in the outer layer, the yarn has a soft feel and is bulky as a whole.

Furthermore, the yarn obtained by the method of the present invention is as follows.

Despite the existence of filaments with significantly different crimp shapes, they have a condensed form of S and Z alternating twists, so there is little shearing during ironing during weaving and knitting, and bulk processing is stable against external forces. Yarn is obtained.

Next, nine examples of the method of the present invention will be explained based on the drawings.

FIG. 1 is a process schematic diagram showing an example of the manufacturing process of the method of the present invention. 3 A highly oriented undrawn polyester yarn Y drawn from a spool 1 is placed between a feed roller 3 and a first delivery roller 5. The filaments are subjected to relaxation heat treatment in a non-contact state by the heater 4, producing irregular shrinkage spots between the filaments. Next, the first delivery roller 5 and the second delivery roller 8
While being intermittently heated by the false twisted body between the two, the second delivery roller 8
After that, it is wound up into a package 10 by a winding roller 9.

FIG. 2 is a process schematic diagram showing another example of the method of the present invention, in which highly oriented polyester undrawn yarn Y+ is used.

After being subjected to relaxation heat treatment in the same manner as shown in FIG. is heated, heat-fixed by the second heater 6, and wound up in the same manner as above.

(Example) The present invention will be specifically explained below using examples.

Example 1 Birefringence Δn obtained by high-speed spinning is 51 x 10
-3 polyethylene terephthalate highly oriented undrawn yarn 10
0d/36f was subjected to relaxation heat treatment under the conditions shown in Table 1 according to the manufacturing process shown in FIG. 1, and then subjected to intermittent heating using a false-twisted body to produce a bulky textured yarn. Here, an air false-twisting nozzle was used as the false-twisting body.

Table 1 The bulky textured yarn obtained is 1. The individual filaments are unconstrained in the longitudinal direction and shrink in the -9 direction, and the individual filaments have uneven yarn length differences and crimp differences, with short filaments mainly located in the core and long yarn length filaments. No. 5 had an 8°2 alternating twist in which the filaments were wound in a loop around the outer layer of the core. The yarn length difference and crimp state of this yarn were measured for 36 filaments of 9 filaments, and the results shown in Table 2 were obtained. The measurement was carried out under a load of 0.05 g/d by marking both ends of a 10 cm long bulky yarn and separating it into two individual filaments.

Table 2 Furthermore, when the dry twist portion and the Z twist portion of the entire yarn were measured at 10 points in the longitudinal direction of the yarn, the average length of the Z twist portion was 17. ．． 3cm, average pitch of twist is 1.811N.

The average length of the S twisted part was 35.3 (1 m), and the average pitch of the twist was 3.2 m.

Using the above-mentioned bulky processed yarn for the warp and weft, the warp density is 8.
When woven into a satin weave with 4 threads/2.54cm and a weft density of 73 threads/2.54am, the filaments constituting the threads did not shift even when ironed in the heddles and flow sections, and the naps remained stable. No defects were observed at all. Furthermore, when the obtained fabric was dyed, a bulky textured yarn fabric with excellent volume and softness was obtained.

Example 2 Highly oriented undrawn polyethylene terephthalate yarn with birefringence of 51 x 10-'' obtained by high-speed spinning 110d/36f
was subjected to relaxation heat treatment according to the process shown in FIG. 2 under the conditions shown in Table 3, and then polyethylene terephthalate drawn yarn 7
5d/36f and intermittently heated with an air false twisting nozzle under the conditions shown in Table 3 to produce a bulky textured yarn.

The bulky textured yarns obtained in Table 3 had clear differences in yarn length and crimp, as if the two yarns had been false-twisted and crimped separately. Further, the yarn obtained by relaxing heat treatment of the highly oriented undrawn yarn develops uneven shrinkage and has two partial crimp differences, and furthermore, the drawn yarn is used as a core yarn and the outer layer contains S,
It was wound in a large loop shape while forming a Z-alternating twist.

This yarn has a warp density of 75 threads/2.54cm and a weft thread density of 6.
When woven into a 2/2 twill structure with 8 threads/2.54cm,
Bulge 5 A bulky fabric with a soft feel, firmness, and excellent waist was obtained. Furthermore, the filaments forming the outer layer did not shift during the weaving process.

Example 3 Polyethylene terephthalate drawn yarn with boiling water shrinkage rate of 30.5% (single yarn fineness 2.08 d, number of filaments 24)
) and polyethylene terephthalate drawn yarn with a boiling water shrinkage rate of 8.0% (single yarn fineness 2°08d, number of filaments 24)
A bulky textured yarn was manufactured using 100 d/48 f of differentially shrinkable mixed fiber yarn made of the following materials under the conditions shown in Table 4. At this time, two fluid jet nozzles are provided along the yarn traveling direction.

=16- The nozzle provided upstream heated in the S direction, and the nozzle provided downstream heated in the Z direction, and compressed air was injected alternately from the two nozzles.

Table 4 The obtained bulky textured yarn has a mixture of crimps of long low shrinkage filaments and short high shrinkage filaments, and coarse crimps of low shrinkage filaments are present in the outer layer of the core of high shrinkage filaments. It had s and z thin twisted parts and was wound up.

=17- This yarn was twisted 800 times/m in two directions.

This is used as the warp and weft, and the warp density is 80/2.54a
m.

Woven in a voile structure with a weft density of 70 threads/2.540m1
When ordinary finishing processing was performed, a wool-like fabric with a soft feel and bulkiness was obtained.

(Effects of the Invention) Since the present invention has the above-mentioned configuration, it is possible to provide a woven or knitted fabric with a richly varied appearance, and moreover, it is possible to use a bulky processed yarn that is stable against external forces such as ironing in the manufacturing and weaving process. It can be easily manufactured.

[Brief explanation of the drawing]

FIG. 1 is a process schematic diagram showing an example of the manufacturing process of the method of the present invention (9), and FIG. 2 is a process schematic diagram showing another example of the manufacturing process of the method of the present invention (9).

Claims (3)

[Claims] (1) Thermoplastic synthetic fiber multifilament yarn is subjected to relaxation heat treatment, and then heated intermittently in the same direction or alternately in different directions under heating with a false twisting body to create S, Z alternate twisting. A method for producing bulky processed yarn characterized by giving. (2) The method for producing a bulky textured yarn according to claim 1, in which heating is performed intermittently in alternating heating in different directions. (3) The method for producing a bulky textured yarn according to claim 1, wherein the thermoplastic synthetic fiber multifilament yarn is composed of two or more types of filaments having different heat shrinkage rates.