High-Strength Spanized Yarn and Method for Producing the Same

Abstract

A spanized yarn constituted by a high strength short fiber containing at least one polymer selected from the group consisting of poly-p-phenylene terephthalamide, poly-p-phenylene benzoxazole, polyethylene, polyvinyl alcohol and wholly aromatic polyester and having a strength of 14 cN/dtex or more, and the high strength short fiber has an average single yarn length of from 50 to 90 cm and a coefficient of variation (CV) in average single yarn length of 50% or less.

1 . A high strength spanized yarn comprising a high strength short fiber comprising at least one polymer selected from the group consisting of poly-p-phenylene terephthalamide, poly-p-phenylene benzoxazole, polyethylene, polyvinyl alcohol and wholly aromatic polyester and having a strength of 14 cN/dtex or more, characterized in that the high strength short fiber has an average single yarn length of from 50 to 90 cm and a coefficient of variation (CV) in average single yarn length of 50% or less.  
     
     
         2 . The high strength spanized yarn according to  claim 1 , wherein the high strength spanized yarn has a strength maintenance rate of 70% or more with respect to the high strength short fiber.  
     
     
         3 . A method for producing a high strength spanized yarn characterized by comprising steps of: tearing a high strength fiber comprising at least one polymer selected from the group consisting of poly-p-phenylene terephthalamide, poly-p-phenylene benzoxazole, polyethylene, polyvinyl alcohol and wholly aromatic polyester and having a strength of 14 cN/dtex or more, between a pair of a feeding roller and a spanizing roller with a distance between the rollers of from 100 to 200 cm, to which a moistening fluid having a humidity of 80% or more is applied; and withdrawing the fiber with conjugation through a fluid nozzle.  
     
     
         4 . The method for producing a high strength spanized yarn according to  claim 3 , wherein the high strength fiber is attached with an oily agent in an amount of from 0.05 to 0.5% by weight.