Hygroscopic fiber, and manufacturing method for same

Abstract

A hygroscopic fiber is a fiber including polyamide 56 resin, and having a ΔMR of at least 3.0%. A method for manufacturing the fiber is by a direct spin draw method in which: a polyamide 56 fiber discharged through a spinneret is cooled and solidified by cooling air; a spinning oil is deposited thereon and the fiber is stretched; and the fiber is taken up. The manufacturing method satisfies (1) the spinneret discharge line rate is between 14 m/min and 30 m/mm; and (2) the product of the take up velocity and the draw ratio is between 3900 and 4500.

1 . A hygroscopic fiber, comprising a polyamide 56 resin, and having an ΔMR of 3.0% or more. 
     
     
         2 . The hygroscopic fiber according to  claim 1 , wherein the fiber has a birefringence ranging from 30×10 −3  or more to 40×10 −3  or less. 
     
     
         3 . A method for manufacturing a hygroscopic fiber by a direct spin draw method comprising cooling and solidifying a polyamide 56 fiber discharged from a spinneret by cooling wind, depositing a spinning oil onto the fiber, drawing the fiber, and then winding the fiber, wherein requirements (1) and (2) are satisfied:
 (1) spinning liner velocity ranges from 14 m/min or more to 30 m/min or less, and   (2) a product of a take up velocity and draw ratio ranges from 3,900 or more to 4,500 or less.   
     
     
         4 . A fabric comprising the hygroscopic fiber according to  claim 1 . 
     
     
         5 . A fabric comprising the hygroscopic fiber according to  claim 1 , wherein a portion is shaped by a mold process. 
     
     
         6 . A fiber structure comprising the fabric according to  claim 4 . 
     
     
         7 . Innerwear comprising the fiber structure according to  claim 6 . 
     
     
         8 . A fabric comprising the hygroscopic fiber according to  claim 2 . 
     
     
         9 . A fabric comprising the hygroscopic fiber according to  claim 2 , wherein a portion is shaped by a mold process. 
     
     
         10 . A fiber structure comprising the fabric according to  claim 5 . 
     
     
         11 . Innerwear comprising the fiber structure according to  claim 10 .