Polyamide multifilament, and method of manufacturing same

Abstract

A polyamide multifilament includes a polyamide resin and has a total fineness of 30.0 to 150.0 dtex, a tenacity of 7.5 to 10.0 cN/dtex, and an elongation at break of 15.0 to 35.0%. A method of producing the polyamide multifilament includes the steps of: providing polyamide chips; and making yarn using a method of direct spinning and drawing, wherein |ηa−ηb|<0.3 is satisfied, assuming that sulfuric acid relative viscosity of said polyamide chips is ηa, and that sulfuric acid relative viscosity of said polyamide multifilament made into yarn is ηb.

1 - 5 . (canceled) 
     
     
         6 . A polyamide multifilament comprising a polyamide and having a total fineness of 30 to 150 dtex, a tenacity of 7.5 to 10.0 cN/dtex, and an elongation at break of 15.0 to 35.0%. 
     
     
         7 . A polyamide multifilament comprising a polyamide and having a total fineness of 50 to 120 dtex, a tenacity of 8.0 to 9.7 cN/dtex, an elongation at break of 17.0 to 30.0%, a variation coefficient of elongation of 1.00% or less at 3 cN/dtex. 
     
     
         8 . The polyamide multifilament according to  claim 6 , comprising 0 to 3 fluffs/10,000 m. 
     
     
         9 . The polyamide multifilament according to  claim 6 , wherein a number of voids contained in a polyamide filament as a constituent of said polyamide multifilament is 50 voids/cm or less. 
     
     
         10 . A method of producing the polyamide multifilament according to  claim 6 , comprising: providing polyamide chips; and making yarn using a method of direct spinning and drawing, wherein |ηa−ηb|<0.3 is satisfied, assuming that sulfuric acid relative viscosity of said polyamide chips is ηa, and that sulfuric acid relative viscosity of said polyamide multifilament made into yarn is ηb. 
     
     
         11 . The polyamide multifilament according to  claim 7 , comprising 0 to 3 fluffs/10,000 m. 
     
     
         12 . The polyamide multifilament according to  claim 7 , wherein a number of voids contained in a polyamide filament as a constituent of said polyamide multifilament is 50 voids/cm or less. 
     
     
         13 . The polyamide multifilament according to  claim 7 , wherein a number of voids contained in a polyamide filament as a constituent of said polyamide multifilament is 50 voids/cm or less.