Dope-Dyed Core-Sheath Type Composite Fiber

Abstract

A dope-dyed core-sheath type composite fiber contains a core layer (A) and a sheath layer (B) which entirely covering the core layer (A). The core layer (A) contains at least one or a plurality of dye materials with at least 0.1% wt in the core part, composites of the core layer (A) and the sheath layer (B) are both dye-soluble polymers. The fineness of the core-sheath type composite fiber is more than 0.5 Denier-per-filament, and a cross-sectional area ratio of the sheath layer X(B) and X(B) 20%.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a composite fiber (conjugate fiber), and more particularly to a core / sheath type composite fiber which includes a sheath layer and a core layer, and composites of the core layer have certain concentration of dyes so as to obtain target color with excellent color fastness.BACKGROUND OF THE INVENTION[0002]Solution dyeing (dope dyeing) has been applied on dye-soluble polymer fiber (such as polyester fiber and nylon fiber) for many years, since the solution dyeing will not produce waste water like bath dyeing, it is environmental friendly to proceed solution dyeing. Nevertheless, the solution dyeing used for dye-soluble polymers includes pigment and the dye material (such as solvent dye and disperse dye). When only the pigment is served as the dyeing material of the solution dye, normally the dope dyed fiber has excellent color fastness. Unfortunately there are many color hues which could not be matched only by pigment. To rea...

AI Technical Summary

Benefits of technology

The present invention provides a dope-dyed core-sheath type composite fiber that uses dyes and has better color fastness without migration problem. The fiber has a fineness more than 0.5 Denier-per-filament and a cross-sectional area ratio X(B) of sheath layer in the composite fiber is more than 20%. The core layer and sheath layer are both dye-soluble polymers, and the dyes used in the core layer can match with pigments to achieve the desired color. The fiber has excellent compatibility and high yarn strength.

Problems solved by technology

When using dyes material, especially when the molecular weight of the dye is less than 400 g / mol, the dyes are migrating easily, and in case total content of the dyes is more than 0.1wt %, it is also risky to pollute the spinning-guide in spinning process, thus increasing the production cost.

Since this moving time is so short, when the composites move out of the cooling outlet, the transferring process stops.

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