Composite twist color fiber

Abstract

Provided is a composite twist color fiber formed by joining polypropylene terephthalate (PPT) and cationic-dyeable polymer side by side. The polypropylene terephthalate (PPT) and the cationic-dyeable polymer differ in contraction rate, such that the composite fiber thus formed is not only helical but also extensible and contractile. Fabric made of the composite fiber is highly capable of elongating and retracting; hence, not only do finished products made of the fabric have low contraction rate, but surface of the fabric also exhibits satisfactory mixing tones.

Description

BACKGROUND OF THE INVENTION1. Field of the Invention[0001]The present disclosure relates to fibers and, more particularly, to a composite twist color fiber comprising two different polymers running side by side and capable of helical extensibility and contractility.2. Description of the Related Art[0002]In general, one way to enable a composite fiber to demonstrate elasticity in order for it to be extensible and contractile is: the fiber is intrinsically elastic, to the same extent as rubber bands are. Owing to physical properties imparted by its molecular structure, the fiber is intrinsically elastic and thus can be stretched. However, its drawback is: when the fiber is stretched, its diameter decreases, leading to two disadvantages. First, finished products made of the fiber have overly high contraction rate. Second, after long use, the fiber is susceptible to elastic fatigue and thus becomes less elastic or severs. The most typical elastic polyurethane fiber is Spandex, commonly ...

AI Technical Summary

Benefits of technology

The present disclosure provides a composite fiber that consists of two polymers of different contraction rates. This fiber has a helical structure that allows it to elongate and retract. When made into fabric, it has a smooth surface and exhibits mixing tones typical of a dual-color twist roll. This fiber has low contraction rate and is highly capable of elongating and retracting, which results in a cost-effective manufacturing process and expands its applications while enhancing its ease of use.

Problems solved by technology

However, its drawback is: when the fiber is stretched, its diameter decreases, leading to two disadvantages.

First, finished products made of the fiber have overly high contraction rate.

Second, after long use, the fiber is susceptible to elastic fatigue and thus becomes less elastic or severs.

First, the processing process incurs high manufacturing cost.

Second, the fiber thus manufactured is difficult to undergo subsequent dyeing and finishing, and thus Spandex is likely to sever during the processing process.

After undergoing heat treatment, the standard polyethylene terephthalate and the denatured polyethylene terephthalate differ in contraction rate, such that the fiber thus formed is helical; however, both of them are polyethylene terephthalate, and thus the difference in contraction rate between them is too small to bring desirable crimp elasticity, thereby failing to the need for usage of elastic fabric.

However, when dyed, the composite fiber fabric made of the polypropylene terephthalate (PPT) and the polyethylene terephthalate (PET) attains one tone rather than two tones or mixing tones, leading to limited application, low popularity, and little value added.

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