Polyester Conjugated Yarn Having High Self-Crimping Properties and Method of Manufacturing the Same

Abstract

Disclosed is a polyester conjugated yarn, including two types of polymers having a large intrinsic viscosity difference subjected to bi-component spinning so as to be longitudinally arranged in a side-by-side sectional structure, in which the twp types of polymers are polyethyleneterephthalate having intrinsic viscosity of 0.45-0.65 as a first polymer and polytrimethyleneterephthalate having intrinsic viscosity of 0.90-1.10 as a second polymer. The polyester conjugated yarn is advantageous in terms of superior spinnability and high uniformity index. In addition, the polyester conjugated yarn can exhibit high self-crimping properties through relaxation-heat treatment of the dyeing and finishing process, and as well, can be applied to manufacture woven / knit fabrics having softness to the touch, beautiful colors, and high drapery and bulk properties, due to inherent characteristics of polytrimentyleneterephthalate.

Description

TECHNICAL FIELD [0001] The present invention relates to a polyester conjugated yarn, including two different types of polymers subjected to bi-component spinning so as to be longitudinally arranged in a side-by-side sectional structure, and a method of manufacturing the same. BACKGROUND ART [0002] Generally, it is known that a conventional side-by-side type conjugated yarn composed of two types of polymers has self-crimping properties, and thus, exhibits uniform spiral crimp tendency by a relaxation-heat treatment during a relaxing process in dyeing and finishing process, as in a bimetal having two metals with different thermal expansion coefficient. [0003] Until now, to manufacture a conjugated yarn having self-crimping properties, there have been used methods of single spinning with one type of polymer by means of varying the quench air velocity, and methods of bi-component spinning with two different types of polymers. In such cases, the crimp properties of the single spinning me...

AI Technical Summary

Benefits of technology

[0006] Leading to the present invention, the intensive and thorough researches on side-by-side conjugated yarns, carried out by the present inventors aiming to avoid the problems encountered in the related art and to solve drawbacks, such as bending or kneeling on the nozzle surface, caused by the difference of intrinsic viscosity between the polymers, lead to development of a specific spinnerette being capable of performing a bi-component spinning process of polymer pairs having different intrinsic viscosities. Further, to maximize the difference of intrinsic viscosity between the polymers, polytrimethyleneterephthalate, which has superior spinnability and elasticity and exhibits good dyeability at low temperatures and softness to the touch, with higher intrinsic viscosity, compared to polyethyleneterephthalate, is used. Thereby, polyethyleneterephthalate and polytrimethyleneterephthalate are subjected to side-by-side bi-component spinning, thus obtaining a desirable polyester conjugated yarn having high self-crimping properties with a circular section. As such, even though the conjugated yarn is manufactured not by conventional two-staged process composed of spinning and drawing but by a one-staged spindraw process of the present invention, it can exhibit high self-crimping properties upon relaxation-heat treatment of the dyeing and finishing process. As well, inherent characteristics of polytrimethyleneterephthalate can result in high softness to the touch, beautiful colors, and superior drapery and bulk properties of woven / knitted products. Also, the polyester conjugated yarn can have high spinnability and uniformity index.

Problems solved by technology

In such cases, the crimp properties of the single spinning method using the quenching is inferior to those of the bi-component spinning method.

Also, the single spinning has the difficulty of mounting the manufacturing equipment in a large scale.

However, use of the copolymer, which is generally low in physical properties, results in low spinnability and reduced crimping properties of the conjugated yarn.

Further, in the cases of using the difference of intrinsic viscosity of the same polymers, there is required a specific spinnerette, and it is difficult to mass-produce a conjugated yarn.

On the other hand, yarn prepared using two kinds of polymers having different shrinkage properties so as to exhibit high crimping properties and high elasticity, that is, yarn resulting from conventional methods disclosed in many patents, is disadvantageous in that the polymers should be subjected to two stages, for example, spinning at a slow rate (1000-1500 m / min) or a fast rate (2500 m / min or more), and drawing by use of a drawing machine having a first godet roller of 80-120° C. and a thermosetting part of 180-250° C., whereby heat shrinkage difference between the polymers may be caused by relaxation-heat treatment using dry heat or moist heat in the dyeing and finishing process, thus crimps are formed.

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