Patent ID: 9617663
Date: 2017-04-11
CPC Classifications: B29D,B60C,D01H,D02G,D10B

Claim:
1. A method of manufacturing a hybrid tire cord comprising: a first step of primarily twisting an aramid filament yarn in a first direction to form an aramid primarily twisted yarn; a second step of primarily twisting a nylon filament yarn in a second direction to form a nylon primarily twisted yarn, the second step and the first step being conducted simultaneously; and a third step of secondarily twisting the aramid primarily twisted yarn and the nylon primarily twisted yarn in a third direction to form a plied yarn, the third step being conducted continuously with the first and second steps, wherein the first, second and third steps are conducted by one twister, the second direction is the same as the first direction, the third direction is opposite to the first direction, and tension applied to the nylon filament yarn in the second step is higher than tension applied to the aramid filament yarn in the first step in such an amount that, if the secondary twist of the hybrid tire cord with a predetermined length were untwisted, the aramid primarily twisted yarn would be 1.005 to 1.025 times longer than the nylon primarily twisted yarn.