Hybrid fiber and method for fabricating the same

Abstract

The present disclosure relates to a hybrid fiber fabricated with a low production cost while having excellent mechanical properties, as well as a method for fabricating the same. The disclosed hybrid fiber includes; a first filament, and a second filament different from the first filament, wherein a strength-strain curve of the hybrid fiber measured according to ASTM D 885 has at least one peak, provided that, if the strength-strain curve has at least two or more peaks, a difference in strain between a first peak having the lowest strain and a second peak having the highest strain, among the above two or more peaks, is 3% or less.

1 . A hybrid fiber, comprising:
 a first filament; and   a second filament different from the first filament, wherein a strength-strain curve of the hybrid fiber measured according to ASTM D 885 regulation has at least one peak, provided that, if the strength-strain curve has at least two or more peaks, a difference in strain between a first peak having the lowest strain and a second peak having the highest strain, among the above two or more peaks, is 3% or less.   
     
     
         2 . The hybrid fiber, according to  claim 1 , wherein the strength-strain curve has one peak. 
     
     
         3 . The hybrid fiber according to  claim 1 , wherein the strength-strain curve has at least two peaks and a first peak has higher strength than that of a second peak. 
     
     
         4 . The hybrid fiber according to  claim 1 , wherein the first filament is an aramid filament, the second filament is a nylon filament, and a content of the aramid filament in the hybrid fiber ranges from 10 and 90 wt. %. 
     
     
         5 . The hybrid fiber according to  claim 1 , wherein the hybrid fiber is a twisted yarn. 
     
     
         6 . The hybrid fiber according to  claim 1 , wherein the first filament is a first primary twisted yarn, the second filament is a second primary twisted yarn, and the hybrid fiber is a ply yarn formed by secondarily twisting the first primary twisted yarn and the second primary twisted yarn. 
     
     
         7 . The hybrid fiber according to  claim 6 , wherein the first and second primary twisted yarns have different twist numbers from each other. 
     
     
         8 . The hybrid fiber according to  claim 1 , further comprising a resorcinol-formaldehyde-latex adhesive. 
     
     
         9 . A method for fabricating a hybrid fiber, comprising:
 preparing a first filament;   preparing a second filament having higher strain than that of the first filament;   applying tension to the second filament, to maintain a difference in strain between the first and second filaments to 3% or less; and   combining the first and second filaments having a difference in strain of 3% or less.   
     
     
         10 . The method according to  claim 9 , further comprising: applying tension to the first filament, wherein the tension applied to the first filament is smaller than tension applied to the second filament. 
     
     
         11 . The method according to  claim 9 , wherein the first filament is an aramid filament and the second filament is a nylon 66 filament. 
     
     
         12 . The method according to  claim 9 , further comprising: primarily twisting the first and second filaments, respectively, to form primary twisted yarns, before combining the first and second filaments, and wherein the combination is executed by secondarily twisting the primary twisted yarns. 
     
     
         13 . The method according to  claim 9 , further comprising: primarily twisting the combined first and second filaments to form primary twisted yarns; and secondarily twisting the primary twisted yarns. 
     
     
         14 . A method for fabricating a hybrid fiber, comprising:
 preparing a first filament;   preparing a second filament having higher strain than that of the first filament; and   combining the first and second filaments, wherein a length of the first filament is longer than that of the second filament.   
     
     
         15 . The method according to  claim 14 , wherein the length of the first filament to be combined is longer than that of the second filament to be combined. 
     
     
         16 . The method according to  claim 14 , further comprising: applying tension to the second filament, before combining the first and second filaments. 
     
     
         17 . The method according to  claim 14 , further comprising: primarily twisting the first and second filaments, respectively, to form primary twisted yarns, before combining the first and second filaments, and wherein the combination is executed by secondarily twisting the primary twisted yarns. 
     
     
         18 . The method according to  claim 14 , further comprising: primarily twisting the combined first and second filaments to form primary twisted yarns; and secondarily twisting the primary twisted yarns. 
     
     
         19 . A method for fabricating a hybrid fiber, comprising:
 preparing a first filament;   preparing a second filament having higher strain than that of the first filament;   primarily twisting the first filament at a first twist number to form a first primary twisted yarn;   primarily twisting the second filament at a second twist number less than the first twist number, to form a second primary twisted yarn; and   secondarily twisting the first and second primary twisted yarns.   
     
     
         20 . The method according to  claim 19 , wherein the second filament is primarily twisted while applying tension to the second filament, to form the second primary twisted yarn.