Organic resin non-crimped staple fiber

Abstract

The present invention is intended to provide an organic resin non-crimped staple fiber that has notably few defects and that uniformly disperses in a dispersion medium, and that is preferred for use in wet-laid nonwoven fabrics or resin reinforcement in applications such as in industrial materials and daily commodities. The organic resin non-crimped staple fiber of the present invention has a fineness of 0.0001 to 0.6 decitex, a fiber length of 0.01 to 5.0 millimeters, a moisture content of 10 to 200 weight %, a cut-end coefficient of 1.00 to 1.40, and a coefficient of variation relative to fiber length (CV %) of 0.0 to 15.0%, the cut-end coefficient and the coefficient of variation relative to fiber length being defined as follows: (1) Cut-End Coefficient=b/a, wherein a is the fiber diameter of a single yarn of the non-crimped staple fiber, and b is the maximum diameter at the cut end; (2) Coefficient of Variation Relative to Fiber Length (CV %)=(standard deviation of fiber length)/(mean value of fiber length)×100(%), wherein the number of measured single yarns is 50 in (1) and (2). The foregoing object can be achieved with this configuration.

1 - 4 . (canceled) 
     
     
         5 . An organic resin non-crimped staple fiber for wet-laid nonwoven fabrics,
 the organic resin non-crimped staple fiber having a fineness of 0.0001 to 0.6 decitex, a fiber length of 1.0 to 5.0 millimeters, a moisture content of 10 to 100 weight %, a cut-end coefficient of 1.00 to 1.40, and a coefficient of variation relative to fiber length (CV %) of 0.0 to 15.0%,   the cut-end coefficient, and the coefficient of variation relative to fiber length being defined as follows:
   Cut-End Coefficient= b/a,   (1)
 
   
       wherein a is the fiber diameter of a single yarn of the non-crimped staple fiber, and b is the maximum diameter at the cut end;
   Coefficient of Variation Relative to Fiber Length( CV  %)=(standard deviation of fiber length)/(mean value of fiber length)×100(%),  (2)
 
 wherein the number of measured single yarns is 50 in (1) and (2). 
 
     
     
         6 . The organic resin non-crimped staple fiber according to  claim 5 , wherein the non-crimped staple fiber is a polyester non-crimped staple fiber, a wholly aromatic polyamide non-crimped staple fiber, or a polyolefin non-crimped staple fiber. 
     
     
         7 . The organic resin non-crimped staple fiber according to  claim 5 , wherein the non-crimped staple fiber is a polyethylene terephthalate non-crimped staple fiber, a polytrimethylene terephthalate non-crimped staple fiber, a polytetramethylene terephthalate non-crimped staple fiber, a polyethylene naphthalate non-crimped staple fiber, a polytrimethylene naphthalate non-crimped staple fiber, a polytetramethylene naphthalate non-crimped staple fiber, a meta-type wholly aromatic polyamide non-crimped staple fiber, a para-type wholly aromatic polyamide non-crimped staple fiber, a polyethylene non-crimped staple fiber, or a polypropylene non-crimped staple fiber. 
     
     
         8 . The organic resin non-crimped staple fiber according to  claim 5 , wherein the non-crimped staple fiber is a conjugate fiber configured from two or more organic resins. 
     
     
         9 . The organic resin non-crimped staple fiber according to  claim 6 , wherein the non-crimped staple fiber is a polyethylene terephthalate non-crimped staple fiber, a polytrimethylene terephthalate non-crimped staple fiber, a polytetramethylene terephthalate non-crimped staple fiber, a polyethylene naphthalate non-crimped staple fiber, a polytrimethylene naphthalate non-crimped staple fiber, a polytetramethylene naphthalate non-crimped staple fiber, a meta-type wholly aromatic polyamide non-crimped staple fiber, a para-type wholly aromatic polyamide non-crimped staple fiber, a polyethylene non-crimped staple fiber, or a polypropylene non-crimped staple fiber.