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

[0005]In view of the aforesaid drawbacks of the prior art, it is an objective of the present disclosure to provide a composite twist color fiber. The composite fiber is formed by joining two polymers of different contraction rates side by side, steadily and uniformly, thereby rendering the fiber helical. 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 is also smooth, soft and delicate and exhibits mixing tones typical of a dual-color twist roll.

[0006]In order to achieve the above and other objectives, the present disclosure provides a composite fiber, comprising: a polymer A, being polypropylene terephthalate (PPT); and a polymer B, being cationic-dyeable polymer, wherein the polymer A and the polymer B run side by side to jointly form a composite fiber, and a transverse cross section of the fiber shows that the polymer A and the polymer B run side by side, wherein the polymer A and the polymer B differ in contraction rate. After undergoing heat treatment, the fiber takes on a helical 3D structure and thus is highly capable of elongating and retracting. Fabric made of the fiber feels good. Finished products made of the fabric have low contraction rate and is highly capable of elongating and retracting. Therefore, the present disclosure reduces manufacturing cost effectively, broadens the applications of the composite fiber and enhances 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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