Method of fabricating a non-hollow fiber having a regular polygonal cross-section

Abstract

Fibers or filaments made by using a spinneret orifice having a regular polygonal cross-section. Melt-spinnable thermoplastic polymer is melted and extruded through a spinneret orifice having a regular polygonal cross-section to form molten filaments. The molten filaments are then solidified, and optionally are subsequently subjected to stretching and false twisting processes.

What is claimed is:  
     
         1 . A method of fabricating a non-hollow fiber having regular polygonal cross-section, comprising the following steps: 
 melting a thermoplastic polymer;    extruding the melted polymer through a spinneret orifice having a regular polygonal cross-section to form molten filaments; and    solidifying the molten filaments to form the non-hollow fiber having regular polygonal cross-section.    
     
     
         2 . The method as claimed in  claim 1 , further comprising the steps of stretching and false twisting the solidified filaments.  
     
     
         3 . The method as claimed in  claim 1 , wherein the fabricated fiber has a regular rectangular cross-section.  
     
     
         4 . The method as claimed in  claim 1 , wherein the fabricated fiber has a regular triangular cross-section.  
     
     
         5 . The method as claimed in  claim 1 , wherein the plastic polymer is selected from the group consisting of polyester, polyamide and polyolefin.  
     
     
         6 . The method as claimed in  claim 5 , wherein the polyester is poly(ethylene terephthalate).  
     
     
         7 . The method as claimed in  claim 5 , wherein the polyamide is Nylon 6 or Nylon 66.  
     
     
         8 . The method as claimed in  claim 5 , wherein the polyolef in is polypropylene.  
     
     
         9 . The method as claimed in  claim 1 , wherein the melting is performed at a temperature between 150-300° C.  
     
     
         10 . A non-hollow fiber having regular polygonal cross-section fabricated by the method as claimed in  claim 1 .  
     
     
         11 . The non-hollow fiber as claimed in  claim 10 , having a fineness of 0.5-5 d.p.f.  
     
     
         12 . A fabric made by the non-hollow fiber as claimed in  claim 10 .  
     
     
         13 . The fabric as claimed in  claim 12  in the form of woven fabric, knitted fabric or non-woven fabric.  
     
     
         14 . The fabric as claimed in  claim 13 , having an lightness value (L) higher than 95 and the windproof coefficient is at least 15% higher than that of a fiber having a round cross-section.