PROCESS TO MANUFACTURE A SPUN-DYED PARA-ARAMID FILAMENT YARN AND A SLIVER, SLIVER, STAPLE FIBER YARN AND TEXTILE FABRIC

摘要

A process to manufacture a spun-dyed para-aramid filament yarn comprises the steps of a) preparing a spin dope comprising a para-aramid polymer, at least one dyestuff and concentrated sulfuric acid, b) spinning the spin dope through a spinneret to obtain spun filaments, c) coagulating the spun filaments to obtain coagulated filaments, d) neutralizing the coagulated filaments to obtain neutralized filaments, e) washing the neutralized filaments to obtain washed filaments, and f) drying the washed filaments to obtain dried filaments, and is characterized in that in step a) the spin dope is prepared of 17.5 to 18.5 % by weight of a para-aramid polymer with respect to the weight of the spin dope, and 4 to 15 % by weight of the at least one dyestuff with respect to the weight of the para-aramid polymer plus the at least one dyestuff, and in step f) during drying the filaments are hold under a tension in a range from 0.2 to 0.8 cN/dtex. Furthermore, a process to manufacture a sliver, a sliver, a staple fiber yarn comprising the sliver, and a textile fabric comprising the staple fiber yarn are described.