Polyamide fibers, fiber structure using same, and clothing

Abstract

Disclosed is a polyamide fiber having a degree of orientation equal to or higher than 0.7 and equal to or lower than 0.85. The polyamide fiber is suitably obtained by forming a polyamide component having high moisture absorbency and a specific soluble component into a conjugated fiber under specific fiber formation conditions.

1 . A polyamide fiber having a degree of orientation equal to or higher than 0.7 and equal to or lower than 0.85. 
     
     
         2 . The polyamide fiber of  claim 1 , having a moisture absorption rate equal to or higher than 5% at a temperature of 35° C. and a humidity of 95% RH, and a water absorption extension rate equal to or higher than 5% at a temperature of 20° C. and a humidity of 65% RH. 
     
     
         3 . The polyamide fiber of  claim 1 , obtained by removing, from a conjugated fiber containing a water-soluble thermoplastic polyvinyl alcohol-based polymer and polyamide, the water-soluble thermoplastic polyvinyl alcohol-based polymer by using hot water. 
     
     
         4 . The polyamide fiber of  claim 1 , obtained by removing, from a conjugated fiber containing an easily alkali-soluble polyester-based polymer and polyamide, the easily alkali-soluble polyester-based polymer by alkali treatment. 
     
     
         5 . The polyamide fiber of  claim 1 , wherein the polyamide is nylon-6. 
     
     
         6 . The polyamide fiber of  claim 1 , wherein the polyamide fiber extends and contracts reversibly upon absorbing and releasing water. 
     
     
         7 . A fiber structure, at least part of which is made of the polyamide fiber of  claim 1 . 
     
     
         8 . Clothing made of the fiber structure of  claim 7 . 
     
     
         9 . The clothing of  claim 8 , wherein the clothing is configured as at least one selected from the group consisting of underwear, sportswear, lining, pantyhose, and socks.