Procedure for the production of synthetic fibers of acrylonitrile. (Machine-translation by Google Translate, not legally binding)

摘要

Process for the production of synthetic fibers of acrylonitrile, in which an acrylonitrile polymer is dissolved in nitric acid to obtain a spin liquid which is extruded in a coagulation bath through a spinneret; the filaments extracted and coagulated in this way are removed from the coagulation bath; they are washed with water and finally dried, characterized in that said spin liquid is passed through a space of gaseous medium located above the surface of the liquid of said bath, under such conditions that the evaporation of the acid is practically suppressed nitric solvent contained in the extracted spin liquid, establishing the degree of swelling of the filaments produced in less than 350% by weight and in less than 300% by weight respectively, measured after the coagulation and water washing operations . (Machine-translation by Google Translate, not legally binding)