METHOD OF MANUFACTURE OF DRAWN PRODUCT (VERSIONS) Russian patent published in 1997 - IPC

FIELD: methods of manufacture of drawn products, particular, methods of manufacture of drawn products from cellulose and applicable in wood-pulp and paper industry and chemical industry. SUBSTANCE: the offered method consists in dissolving of cellulose in solvent mixed with water and containing together with water amino oxide for production of spinning solution, forcing of solution through, at least, one opening for producing drawn blank, its passing through, at least, one water-containing bath for removal of solvent and manufacture of drawn product and drying of drawn product. For manufacture of dry drawn product, pH of water-containing bath, and of each water-containing bath through which drawn blank is passed and drawn product during treatment between production of drawn blank and drying of drawn product is maintained at 8.5 or lower. In this case, after drying, drawn product is bleached in bleaching bath at pH above 8.5. The invention offers a group from which amino oxide is selected, particular, values of pH of baths in making drawn products. EFFECT: higher efficiency. 16 cl, 2 dwg