method of manufacturing dip code for rubber hose of vehicles having excellent heat resistance and pressure resistnace using composite yarn with meta-aramid spun yarn and para-aramid filament yarn

摘要

The method for manufacturing a long-short composite aramid dip cord yarn for a heat-resistant/pressure-resistant rubber hose for automobiles according to the present invention is a para-aramid filament yarn having a thickness of 1000 to 1500 denier twisted in the first direction and a para/meta blend aramid spun yarn twisted in the first direction. manufacturing a long-short composite ply-twisted yarn by twisting with a first twist number in a first direction; performing a first heat setting on the long-short composite ply-twisted yarn; twisting the first heat-set long-short composite ply-twisted yarn by twisting it with a second twist number in a second direction; performing a second heat setting on the untwisted long-short composite ply-twisted yarn; And in order to improve interfacial adhesion with the inner/outer layer rubber, the second heat-set long-short composite ply-twisted yarn is subjected to a primer heat treatment to prepare a dip cord yarn before braiding.