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%.

What is claimed is: 
     
         1 . A dope-dyed core-sheath type composite fiber comprising:
 a core layer (A) and a sheath layer (B) entirely covering the core layer (A); characterized in that:   the core layer (A) contains at least one or a plurality of dye materials with at least 0.1% wt in core part, composites of the core layer (A) and the sheath layer (B) are both dye-soluble polymers;   A 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%.   
     
     
         2 . The dope-dyed core-sheath type composite fiber as claimed in  claim 1 , wherein composite of the core layer (A) is polyester polymer, and composite of the sheath layer (B) is polyester polymer. 
     
     
         3 . The dope-dyed core-sheath type composite fiber as claimed in  claim 1 , wherein composite of the core layer (A) is polyamide polymer, and composite of the sheath layer (B) is polyamide polymer.