Process for the continuous spinning of viscose rayon

摘要

A process is provided herein for continuously spinning viscose yarns by extruding viscose into a coagulating bath to form filaments and partially coagulating these filaments to a coagulation index of between 15 and 18, while concurrently stretching said filaments to the desired stretch ratio and then subjecting the filaments to a 2-stage coagulation treatment in which (1) the filaments are advanced without further chemical treatment onto e.g. a first advancing roller where partial spontaneous coagulation occurs such that the coagulation index is between 5 and 8 and (2) a second stage coagulation which comprises contacting the filaments with an acid bath at a temperature between 50 DEG and 100 DEG C. until complete coagulation occurs such that the coagulation index is between 0 and 1. The aforementioned process permits the spinning operation to occur at a much greater speed than was hitherto possible without increasing dimensions of the treatment zones or apparatus.