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.

Claims

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.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0007] FIG. 1 is a schematic cross-sectional view of a composite fiber of present disclosure.

[0008] FIG. 2 is a schematic perspective view of the composite fiber of present disclosure.

[0009] FIG. 3 is a schematic cross-sectional view of the composite fiber according to another aspect of present disclosure.

DETAILED DESCRIPTION OF THE INVENTION

[0010] Referring to FIG. 1 and FIG. 2, the present disclosure provides a composite twist color fiber. The composite fiber comprises a polymer A, i.e., polypropylene terephthalate (PPT), and a polymer B, i.e., cationic-dyeable polymer. The polymer A and the polymer B run side by side to jointly form one single fiber, such that the transverse cross section of the fiber shows that the polymer A and the polymer B run side by side. The polymer A and the polymer B differ in contraction rate. The aforesaid technique of joining two polymers side by side is also known as conjugate spinning, one of the conventional methods of manufacturing fiber yarns. The polymer A, i.e., polypropylene terephthalate (PPT), is a standard polyester fiber with a mechanical strength of 30.91˜52.98 cN/tex. Regardless of whether it is dry or wet, the polymer A has the highest degree of stability of physical properties and manifests low deformability, high tolerance to heat, high thermoplasticity, high lightfastness and high weatherability. The polymer A has physical properties similar to those of wool and thus can be spun together with wool, rayon and cotton. The polymer B, i.e., cationic-dyeable polymer, is a low-priced modified polyester fiber whose polymeric structure has a cationic-dyeable sulfonate group and thus is deeply dyed and brightly colored. Furthermore, the polymer B demonstrates enhanced dyeability and enhanced tinting strength and thus can attain deep, bright colors with just a small amount of dye. In this embodiment, the polymer B, i.e., cationic-dyeable polymer, is cationic-dyeable polyethylene terephthalate (CD PET), cationic-dyeable polybutylene terephthalate (CD PBT) or cationic-dyeable polyamide (CD PA).

[0011] The polymer A and the polymer B can be firmly joined side by side, because of their excellent compatibility and resultant high adhesiveness, so as to prevent their separation during any subsequent composite fiber forming process. Referring to FIG. 3, the transverse cross section of the composite fiber shows that the polymer A and the polymer B run side by side and shows that the polymer B takes up 40˜60% of total area of the fiber. Preferably, the polymer A and the polymer B each take up 50% of total transverse cross-sectional area of the fiber. Therefore, the present disclosure effectively enhances the overall bonding strength of the composite fiber and minimizes the chance that the composite fiber will sever. After undergoing heat treatment, the fiber takes on a helical 3D structure, because the polymer A and the polymer B differ in contraction rate. Therefore, finished products made of the composite fiber of the present disclosure have minimal contraction rate, because stretching the fiber causes elongation of the helical structure instead of a diminution in the diameter of the fiber.

[0012] The reason why the present disclosure discloses the use of the cationic-dyeable polyester is explained below. The polypropylene terephthalate (PPT) and the cationic-dyeable polymer differ in the tinting strength of cationic dye. Upon completion of a dyeing process performed with the same dye, the polypropylene terephthalate (PPT) and the cationic-dyeable polymer differ in tints and shades. Thus, the use of one single dye ensures that one single fiber will display two different colors which, coupled with the helical 3D structure of the fiber, enable every fiber to produce the same color pattern as exhibited by a dual-color twist roll, as shown in FIG. 2.

[0013] Fabric made of the composite fiber is highly capable of elongating and retracting. Therefore, finished products made of the fabric display different patterns and colors, have low contraction rate, incur low manufacturing cost, and have broad applications.

[0014] The present disclosure is disclosed above by preferred embodiments. However, persons skilled in the art should understand that the preferred embodiments are illustrative of the present disclosure only, but shall not be interpreted as restrictive of the scope of the present disclosure. Hence, all simple equivalent changes and modifications made to the aforesaid embodiments in accordance with the claims and specification shall fall within the scope of the present disclosure.