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.

What is claimed is: 
     
         1 . 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 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.   
     
     
         2 . The composite fiber of  claim 1 , wherein the polymer B is cationic-dyeable polyethylene terephthalate (CD PET), cationic-dyeable polybutylene terephthalate (CD PBT) or cationic-dyeable polyamide (CD PA). 
     
     
         3 . The composite fiber of  claim 2 , wherein the polymer B takes up 40˜60% of total area of the fiber. 
     
     
         4 . The composite fiber of  claim 3 , wherein the polymer A and the polymer B each take up 50% of total transverse cross-sectional area of the fiber. 
     
     
         5 . The composite fiber of  claim 1 , wherein, after undergoing heat treatment, the fiber takes on a helical 3D structure.