Production method of hemp fiber for spinning and hemp fiber for spinning

Abstract

A production method of hemp fiber for spinning, the method including an immersion treatment process of immersing raw hemp fiber in a treatment liquid including water and at least one type of enzyme selected from the group consisting of protease enzymes and starch hydrolyzing enzymes for an immersion time of from 30 minutes to 60 minutes under a condition of a temperature of from 60° C. to 100° C., a water-washing process of washing the immersion treated hemp fiber with water, and a drying process of drying the water-washed hemp fiber.

1 . A method of producing hemp fiber for spinning, comprising:
 immersing raw hemp fiber in a treatment liquid containing water and at least one enzyme selected from the group consisting of proteases and starch hydrolyzing enzymes, for from 30 minutes to 60 minutes at a temperature of from 60° C. to 100° C.;   washing the immersion treated hemp fiber with water; and   drying the washed hemp fiber.   
     
     
         2 . The method of producing hemp fiber for spinning of  claim 1 , wherein the treatment liquid contains an alkaline agent. 
     
     
         3 . The method of producing hemp fiber for spinning of  claim 1 , wherein the treatment liquid has a pH of from 9 to 13. 
     
     
         4 . The method of producing hemp fiber for spinning of  claim 1 , further comprising a post-treatment, after the washing, wherein the post-treatment comprises immersing the washed hemp fiber in a post-treatment liquid containing water and at least one compound selected from the group consisting of sodium nitrobenzenesulfonate and sodium cyanurate, for from 20 minutes to 50 minutes at a temperature of from 60° C. to 100° C. 
     
     
         5 . A hemp fiber for spinning that is obtained by the method of producing hemp fiber of  claim 1 , having a narrower fiber diameter than that of raw hemp fiber, being twisted, and having fine naps on a fiber surface.