Cord including bio-based component and method for preparing the same

Abstract

The present application relates to a hybrid cord including a bio-based nylon primarily twisted yarn. According to the present application, while including a primarily twisted yarn including bio-based nylon having a higher modulus compared to chemical-based nylon, there is provided a hybrid cord and has elongation and fatigue resistance equivalent to or higher than commercially required levels (i.e., the level that the cord including a conventional chemical-based nylon primarily twisted yarn has).

1 . A hybrid cord comprising a hybrid raw con and a coating layer formed on the hybrid raw cord,
 wherein the hybrid raw cord comprises a first primarily twisted yarn formed by imparting twist to a bio-nylon fiber having a fineness of 600 to 2000 denier, and a second primarily twisted yarn formed by imparting twist to a dissimilar resin fiber different from the bio-nylon having a fineness of 800 to 2200 denier,   wherein a twist number of the first primarily twisted yarn is in the range of 250 to 600 TPM,   wherein the hybrid raw cord contains the first primarily twisted yarn in an amount of 20 to 50% by weight relative to 100% by weight of the total weight, and   wherein the hybrid cord satisfies a strength retention rate of 90% or more after an 8-hour disk fatigue test performed according to JIS-L 1017 method of Japanese Standard Association (JSA).   
     
     
         2 . The hybrid cord according to  claim 1 , wherein:
 a twist number of the second primarily twisted yarn is in the range of 250 to 600 TPM.   
     
     
         3 . The hybrid cord according to  claim 1 , wherein:
 the hybrid raw cord is formed by secondary twisting the first primarily twisted yarn and the second primarily twisted yarn within the range of 250 to 600 TPM.   
     
     
         4 . The hybrid cord according to  claim 1 , Wherein:
 the second primarily twisted yarn is formed by imparting twist to an aramid fiber.   
     
     
         5 . The hybrid cord according to  claim 1 , wherein:
 the first primarily twisted yarn is formed by imparting twist to a bio-nylon fiber having a fineness of 750 to 1100 denier, and   the second primarily twisted yarn is formed by imparting twist to a dissimilar resin fiber different from the bio-nylon having a fineness of 900 to 1200 denier.   
     
     
         6 . The hybrid cord according to  claim 5 , wherein:
 a twist number of the first primarily twisted yarn is 300 TPM or more.   
     
     
         7 . The hybrid cord according to  claim 1 , wherein:
 the first primarily twisted yarn is formed by imparting twist to a bio-nylon fiber having a fineness of 1100 to 1500 denier, and   the second primarily twisted yarn is formed by imparting twist to a dissimilar resin fiber different from the bin-nylon having a fineness of 1200 to 1800 denier.   
     
     
         8 . The hybrid cord according to  claim 7 , wherein:
 a twist number of the first primarily twisted yarn is 400 TPM or less.   
     
     
         9 . The hybrid cord according to  claim 1 , wherein:
 the hybrid cord satisfies a strength retention rate of 70% or more after a 16-hour disk fatigue test performed according to JIS-L 1017 method of Japanese Standard Association (JSA).   
     
     
         10 . The hybrid cord according to  claim 1 , wherein:
 the hybrid cord has a constant load elongation of at least 2.8% at 4.5 kgf.   
     
     
         11 . A method for preparing a hybrid cord, the method comprising the steps of:
 preparing a plied twisted yarn in which a first primarily twisted yarn formed by imparting twist to a bio-nylon fiber having a fineness of 600 to 2000 denier, and a second primarily twisted yarn formed by imparting twist to a dissimilar resin fiber different from the bio-nylon having a fineness of 800 to 2200 denier are secondarily twisted together, and   forming a coating layer on the plied twisted yarn while applying a tension to the plied twisted yarn,   wherein a twist number imparted to the first primarily twisted yarn is in the range of 250 to 600 TPM,   wherein the hybrid raw cord contains the first primarily twisted yarn in an amount of 20 to 50% by weight relative to 100% by weight of the total weight,   wherein a tension applied to the plied twisted yarn is 1.0 kg/cord or less, and   wherein the hybrid cord satisfies a strength retention rate of 90% or more after an 8-hour disk fatigue test performed according to JIS-L 1017 method of Japanese Standard Association (JSA).   
     
     
         12 . The method for preparing a hybrid cord according to  claim 11 , wherein:
 a twist number imparted to the second primarily twisted yarn is in the range of 250 to 600 TPM.   
     
     
         13 . The method for preparing a hybrid cord according to  claim 11 , wherein:
 the first primarily twisted yarn and the second primarily twisted yarn are secondary twisted within the range of 250 to 600 TPM to form a plied twisted yarn.   
     
     
         14 . The method for preparing a hybrid cord according to  claim 11 , wherein:
 the second primarily twisted yarn is formed by imparting twist to an aramid fiber.   
     
     
         15 . The method for preparing a hybrid cord according to  claim 11 , wherein:
 the first primarily twisted yarn is formed by imparting twist to a bio-nylon fiber having a fineness of 750 to 1100 denier, and the second primarily twisted yarn is formed by imparting twist to a dissimilar resin fiber different from the bio-nylon having a fineness of 900 to 1200 denier.   
     
     
         16 . The method for preparing a hybrid cord according to  claim 15 , wherein:
 a twist number imparted to the first primarily twisted yarn is 300 TPM or more.   
     
     
         17 . The method for preparing a hybrid cord according to  claim 11 , wherein
 the first primarily twisted yarn is formed by imparting twist to a bio-nylon fiber having a fineness of 1100 to 1500 denier, and the second primarily twisted yarn is formed by imparting twist to a dissimilar resin fiber different from the bio-nylon having a fineness of 1200 to 1800 denier.   
     
     
         18 . The method for preparing a hybrid cord according to  claim 17 , wherein:
 a twist number imparted to the first primarily twisted yarn is 400 TPM or less.   
     
     
         19 . The method for preparing a hybrid cord according to  claim 11 , wherein:
 the hybrid cord satisfies a strength retention rate of 70% or more after a 16-hour disk fatigue test performed according to JIS-L 1017 method of Japanese Standard Association (JSA).   
     
     
         20 . The method for preparing a hybrid cord according to  claim 11 , wherein:
 the hybrid cord has a constant load elongation of at least 2.8% at 4.5 kgf.