JPH03174043A - Stretchable conjugate textured yarn, production thereof and stretchable fabric composed of the same textured yarn - Google Patents

Abstract

PURPOSE:To obtain the subject high-strength textured yarn capable of high-speed drawing and conjugate texturing by crimping, etc., specific multifilament yarn on a core part of elastic yarn composed of a specific block copolymer polyether.polyester and forming an outer layer part. CONSTITUTION:The objective textured yarn, obtained by twisting filament yarn on the high-elongation side composed of a block copolymer polyether.polyester containing a polybutylene terephthalate-based polyester as hard segments and polyoxybutylene glycol-based polyether as soft segments and filament yarn on the low-elongation side of a nonelastic thermoplastic polymer having <=40% breaking elongation and >=2.5g/d breaking strength with a false twisting tool, heat setting the resultant shape with a heater, further untwisting the yarn with the false twisting tool and forming a core part from the filament yarn on the high-elongation side and crimps, loops and bulged parts from the filament on the low-elongation side thereon and constructing an outer layer therefrom. Furthermore, the aforementioned textured yarn is used to afford stretchable fabrics for sports, casual wears, etc.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a method for producing false twisted yarns obtained by aligning two or more types of synthetic fiber multifilament yarns with different elongations and subjecting them to stretching or stretch false twisting. This invention relates to improving the mechanical functionality of composite yarns.

[Prior art and its problems 1: A method for producing a core-sheath two-layer structure yarn by subjecting two or more types of synthetic fiber filament yarns with different elongations to a composite stretching process or a composite stretching false twisting process, and the product obtained thereby The two-layer structure yarn is manufactured by Tokuko Sho 63-16494 or Tokuko Sho 61-
This is proposed in Publication No. 19733.

Fabrics made from this type of composite textured yarn can provide a bulky feel or a wool-like and luxurious texture and appearance that could not be achieved with conventional bulky yarns due to differential structural shrinkage or false-twisted yarns made of single yarns. It is suitably used for interior decoration, men's and women's suits, etc.

However, when this composite textured yarn fabric is used for sports clothing or casual clothing, problems arise such as insufficient elasticity and insufficient strength of the sheath yarn.

That is, this composite textured yarn has only some elasticity even when it is a false twisted textured yarn, and does not have enough elasticity to be applied to sports clothing. Furthermore, since the outer layer yarn of the sheath yarn has not been sufficiently drawn, its elongation remains higher than that of the core yarn even after processing, and therefore its strength is not increased accordingly (
(Only about 1.5 g/de), and this also applies to the composite textured yarn of Japanese Patent Publication No. 19494/1983 mentioned above.

On the other hand, polyurethane elastic yarns have conventionally been used to produce highly stretchable composite yarns, but polyurethane yarns have the problem of being susceptible to deterioration when heated. By the way, even if you try to composite it with polyester fiber,
Since polyester llff requires high temperature dyeing at 130° C., such high temperature dyeing causes hydrolysis and deterioration of the polyurethane yarn, making it impractical. Similarly, even when the composite plate is twisted, there is a problem in that the polyurethane deteriorates when set at high temperatures. For this reason, the actual situation is that the fibers on the other side of the composite are also limited to polyamide IIM.

Furthermore, when false-twisting polyurethane elastic yarns and nylon yarns by aligning them, the polyurethane yarns are temporarily tensed in advance, and then aligned with the nylon drawn yarns, with the aim of imparting elasticity to the entire composite textured yarn. It is said that it is preferable to false twist a polyurethane yarn as a core yarn and then release the tension to obtain a composite textured yarn in which the polyurethane yarn is surrounded by nylon wound yarn. However, in this case, there was a problem in that the polyurethane, which has low strength and is easy to stretch, is heated as a core yarn during false twisting, resulting in frequent yarn breakage.

[Object of the Invention] The object of the present invention is to solve such conventional problems and provide improved elasticity to a composite processed yarn made from two or more types of synthetic fiber filament yarns with different elongations, and at the same time provide an improved elasticity for the outer layer. The aim is to increase the strength of the yarn and improve it so that it can be applied to casual and sports clothing.

Another object of the present invention is to provide a mating g that can be combined with a stretchable elastic thread.
The purpose of this invention is to make it possible to widely apply ILT synthetic fibers not only to polyamide but also to other synthetic fibers such as polyester.

Furthermore, another object of the present invention is to reduce yarn breakage when performing composite processing, particularly composite plate twisting processing.

[Structure of the Invention] As a result of intensive research to achieve the above object, the present inventors found that, contrary to the conventional concept, even if an elastic yarn is used for the yarn on the high elongation side, the elastic The present invention was achieved by discovering the surprising fact that the yarn is located at the center of the composite processed yarn.

Thus, according to the present invention, (1) an elastic thread composed of a block copolymerized polyether/polyester having polybutylene terephthalate polyester as a hard segment and polyoxybutylene glycol polyether as a soft segment constitutes the core portion; On the other hand, a multifilament yarn made of an inelastic thermoplastic polymer with a breaking elongation of 40% or less and a breaking strength of 2.5 g/de or more forms the outer layer while forming crimps, loops, and overhangs. (■ When two or more types of synthetic fiber filament yarns with different elongations are aligned and stretched, a non-elastic thermoplastic polymer is used as the filament yarn on the low elongation side. The filament yarn on the high elongation side is made of block copolymerized polyether/polyester with hard segments of polybutylene terephthalate polyester and soft segments of polyoxybutylene glycol polyether. and (3) a block copolymerized polyester comprising polybutylene terephthalate polyester as a hard segment and polyoxybutylene glycol polyether as a soft segment. An elastic thread composed of ether polyester constitutes the core, and has a cutting elongation of 40% or less and a cutting strength of 2.
Provided is a stretchable fabric in which a thermoplastic synthetic fiber multifilament yarn of 5 g/de or more is crimped or looped to form an overhang, and a stretchable composite processed yarn constituting an outer layer is integrated.

Further, the present invention will be explained in detail. The attached drawing shows another embodiment of manufacturing the stretchable composite textured yarn of the present invention, in which filament yarns 1.2 with different elongations are subjected to a drawing false twisting process. The side filament yarn 1 is made of thermoplastic multifilament yarn such as polyamide or polyester, which usually has an elongation of about 80 to 350%, and the high elongation side filament yarn 2 is made of polybutylene terephthalate polyester as a hard segment. , an elastic thread obtained by melt spinning a block copolymerized polyether/polyester having polyoxybutylene glycol polyether as a soft segment is used.

The elongation of this elastic thread should normally be in the range of about 250 to 600%. In the process shown in the figure, the raw yarn 1.2 is pulled together and passed through the first supply roller 3. Interlace nozzle 4
After that, it is supplied from the second supply roller to the false twisting processing area,
The filament yarn 1 on the low elongation side is twisted by the false twister 7.
The filament yarn 2 on the high elongation side is wound around the filament yarn 2, which is heat-set by a heater 6, untwisted by a false twister 7, passed through a drawing roller 8, and then reaches a winder 9.

The greatest feature of the present invention is that in the composite yarn that has passed through the false twister 7, elastic recovery of the filament yarn 2 on the high elongation side is exhibited, and the high elongation side located in the outer layer portion in the twisting region is The filament yarn 2 moves to the core of the composite yarn, and conversely, in the twisting region, the low elongation filament yarn that made up the core moves to the surface layer of the composite yarn while developing crimp. .

The above-mentioned reversal phenomenon of the position of the filament on the high elongation side is achieved by the process shown in the above-mentioned Japanese Patent Publication No. 16494/1983, namely,
It is easy to understand that even in the process shown in the figure, which does not use a false twister, this occurs after the stretching rollers.

In this case, if the composite textured yarn is entangled to integrate its structure, it will be easier to handle, and the two types of filament yarns will not separate even if they are repeatedly subjected to elongation recovery deformation in subsequent steps. As shown in the figure, interlacing is carried out by first
The material may be supplied to the air interlace nozzle 4 by the supply roller 3, and may be interlaced before or after false twisting. Furthermore, in relation to the application, a second heater (
It is also possible to set the composite yarn in a section (not shown) to adjust yarn properties such as Sumoto shrinkage rate.

The filament yarn on the high elongation side used in the present invention is a block copolymer polyether with polybutylene terephthalate polyester as a hard segment and polyoxybutylene glycol polyether as a soft segment.
Elastic thread obtained by melt-spinning polyester is used.

Furthermore, the polymer will be explained in detail.

The polyester portion constituting the hard segment of the block copolymerized polyether/polyester is mainly polybutylene terephthalate consisting of a terephthalic acid component and a butylene glycol component. however,
A part of this acid component, usually 30 mol% or less, may be replaced with a dicarboxylic acid component or oxycarboxylic acid component other than the terephthalic acid component, and a part of the acid component, usually 30 mol% or less, other than the butylene glycol component. It may also be a polyester in which the dioxy component is replaced. The polyether moiety constituting the soft segment is mainly polyoxybutylene glycol, but it may also be a polyether in which 30% or less of its repeating units are replaced with a dioxy component other than the butylene glycol component. The average molecular weight of the polyether moiety is preferably in the range of 500 to 5,000, particularly 500, since it is difficult to obtain sufficient elastic properties if it is too small, and the compatibility with the hard segment deteriorates if it is too large.
It is preferably in the range of 0 to 3000. In addition, the ratio of the polyether part to the polyester part is
If the amount is too small, it will be difficult to obtain sufficient elastic properties, and if the amount is too large, the melting point will decrease significantly, making it difficult to obtain sufficient thermal properties. , especially 0.25~
A range of 2.5 times is preferred. A method for producing such a block copolymerized polyether polyester is disclosed in Japanese Patent Application Laid-open No. 58-9.
This can be carried out according to the method proposed in Japanese Patent No. 1819.

On the other hand, inelastic polyamide fibers or polyester fibers are used for the synthetic fiber filament yarn on the low elongation side. In particular, in combination with polyurethane thread, which is a conventional elastic thread, it was limited to polyamide amH, but according to the present invention, polyester m/m, which is the main material for outer clothing, can also be used, greatly expanding the range of applications. It turns out.

Furthermore, as the polyester, in addition to ordinary polyester fibers, cationic dye-dyable polyether I11 and the like can also be used. Since the strength of this cationic dyeable polyester fiber itself is weaker than that of ordinary polyester fibers, cationic dyeable polyester fibers such as those proposed in Japanese Patent Application No. 63-63692 are particularly preferred. be done. As such, a sulfonic acid phosphonium salt represented by the following general formula;
A modified polyester having an intrinsic viscosity of 0.5 or more and copolymerized in mol% is exemplified. Here, A is an aromatic group or an aliphatic group,
×1 is an ester-forming functional group, ×2 is an ester-forming functional group that is the same as or different from xl, or R1* R2r Ri
e and R4 are the same or different groups selected from alkyl groups and aryl groups, and n is a positive integer.

[Effect of the invention] The effects of the present invention are as follows.

(Button) Since the surface layer yarn of the composite processed yarn can be completely drawn, the strength can be increased to 2.59/de or more, especially 3 g/de. Therefore, clothes made of this processed yarn can be It does not fuzz or cause wear, making it suitable for sports, casual wear, and uniforms.

+to Since the elastic yarn does not serve as a processing tension support during yarn processing, composite stretching processing can be performed at high speed without yarn breakage.

(C) The heat resistance of the elastic yarn is higher than that of polyurethane, making it possible to perform composite processing not only with polyamide fibers, which have a low crystallization start temperature, but also with mtit, such as polyester, whose crystallization start temperature is 100°C or higher. .

<d+ For the same reason as (C), high temperature (e.g. 130
°C) Composite with polyester that has to be dyed becomes possible.

[Example] Example 1 Polyethylene terephthalate undrawn yarn (spinning speed 1500 m/ntm,
135 denier, 727 (Lament, elongation rX315%
), and an undrawn yarn obtained by melt-spinning block copolymerized polyether/polyester elastomer at 230°C as the high elongation side filament yarn 2 (spinning speed 13507'rL/l1).
lin, 80 denier, 2 filaments, elongation 47
Using the process shown in Figure 1 (however, the false twister was removed), both yarns were pulled together and fed to the air entangling nozzle 4, with an overfeed rate of 1% and compressed air. Pressure 3 K9 /
The drawn yarn is entangled under the conditions of Cd, and then the supply roller 5 is heated to 87°C and the set heater 6 is heated.
at 135°C, stretching ratio 2.8 times, stretching speed 800 m.
/min.

When the processed yarn thus obtained was observed under a microscope, it was found that the elastic yarn was located in the core of the composite yarn, and that the individual filament yarns of the multifilament were sagging (forming loops, overhangs). It surrounded the elastic thread in a state of

In addition, the composite yarn was intertwined and integrated as a whole, and the composite yarn did not separate into two types of yarns even after repeated stretching and deformation.

Furthermore, the single fiber strength of the polyethylene terephthalate yarn was as high as 4.8 g/de.

This is because, unlike the conventional method, the yarn serving as the sheath yarn can be drawn at a high drawing ratio.

Example 2 Polyethylene terephthalate undrawn yarn (spinning speed 3400 m/mi Tsuru,
220 denier, 96 filament, stretch [! 125%
), and an undrawn yarn obtained by melt-spinning a block copolymerized polyether/polyester elastomer into the high elongation filament yarn 2 (spinning speed 1550 m/itn, 12
0 denier, 3 filaments, elongation 412%>, both yarns were drawn together using the process shown in Figure 1, and fed to the air entangling nozzle 4, with an overfeed rate of 1% and a pneumatic pressure of 3.
Kg/ci, the drawn yarns are entangled, and then a friction type false twister is used as the false twister 7, and the surface speed (■ "
) and yarn speed (Vy) was set to 2.1 times, the set heater 6 was set at 158° C., and stretching and false twisting was performed at a draw ratio of 1.55 times.

When the processed yarn obtained in this way was observed under a microscope, the elastic yarn was located in the core of the composite yarn, and the polyethylene terephthalate yarn was found to be an elastic yarn in a state where the individual filament yarns of the multifilament were crimped and sagged. was surrounding. Moreover, the composite yarn as a whole was intertwined and integrated, and even after repeated stretching and deformation, the composite yarn did not separate into two types of yarn.

Further, the single fiber strength of the polyethylene terephthalate yarn was as high as 4.6 g/de for the same reason as in Example 1.

[Brief explanation of the drawing]

The drawing shows an example of the process for obtaining the stretchable composite processed yarn of the present invention.
[1! It is a route map showing. 1... Filament thread on the low elongation side made of an inelastic polymer 2... Filament thread on the high elongation side made of an elastic polymer 3... First supply roller 4... Interlace nozzle 5...Second supply roller 6...Heater 7...False twister 8...Stretching roller 9...Winder

Claims (6)

[Claims] (1) An elastic thread composed of a block copolymerized polyether/polyester with polybutylene terephthalate polyester as a hard segment and polyoxybutylene glycol polyether as a soft segment constitutes the core, and the elongation at break is 40% or less, cutting strength is 2.
A stretchable composite processed yarn characterized in that a multifilament yarn made of an inelastic thermoplastic polymer with a weight of 5 g/de or more forms an outer layer portion while forming crimps, loops, and overhangs. (2) The stretchable composite textured yarn according to claim 1, wherein the composite textured yarn is provided with entanglement. (3) When drawing two or more types of synthetic fiber filament yarns with different elongations, a multifilament yarn made of an inelastic thermoplastic polymer is used as the filament yarn on the low elongation side, and the other filament yarn on the high elongation side is used. The filament yarn on the elongation side is characterized by using an elastic yarn composed of block copolymerized polyether/polyester with polybutylene terephthalate polyester as a hard segment and polyoxybutylene glycol polyether as a soft segment. A method for producing stretchable composite processed yarn. (4) The method for producing a stretchable composite textured yarn according to claim 3, wherein the two or more types of filament yarns are integrated using an air entangling nozzle before or after the stretching process. (5) The method for producing a stretchable composite textured yarn according to claim 3, wherein the stretching process is a stretching process. (6) The core is composed of an elastic yarn composed of block copolymerized polyether/polyester, with polybutylene terephthalate polyester as a hard segment and polyoxybutylene glycol polyether as a soft segment, and has a breaking elongation of 40 % or less, cutting strength is 2.5g
1. A stretchable fabric characterized in that the thermoplastic synthetic fiber multifilament yarn of /de or more is made of a stretchable composite processed yarn forming an outer layer portion while forming crimps, loops, and overhangs.