Modern Technology for the Production of Hydrated Cellulose Fibers

The paper discusses experimental techniques for pulping, bleaching, and creating manmade fibers based on Na-sulfite and Mg-bisulfite dissolving pulps utilizing a dry-jet wet spinning procedure with solutions in N-methylmorpholine-N-oxide. After pulping, Mg-bisulfite pulp had a cellulose yield of 46.1% and Na-sulfite pulp of 44.0%. For Na-sulfite and Mg-bisulfite pulps, the Kappa number was 14.1 and 15.6 units, respectively. According to TCF technology, the overall yield of the semi-finished product after bleaching was 33.5% for Na-sulfite pulp and 36.4% for Mg-bisulfite pulp. For Na-sulfite and Mg-bisulfite pulps, the α-cellulose content was 92% and 91%, respectively. Spinning solutions of various concentrations were obtained from the resulting cellulose, and their rheological behavior was determined. The fibers were spun using the dry-jet wet spinning technique from 14% cellulose solutions, and their morphology and structure were examined. The fibers’ revealed mechanical properties are superior to viscose fibers and on par with those of commercial Lyocell fiber analogs.