Till now, the Lyocell technology still follows the conventional
viscose process using the pulp with low hemicelluloses content as the raw material [1-3], which is to guarantee a high yield of fiber in the conventional
viscose process.
The prevalent rayon production method used in producing tire yam - the
viscose process - uses sodium hydroxide, carbon disulfide, hydrogen sulfide, sulfuric acid and zinc.
In the case of the very low values for rayon emerging from Lenzing, we think full credit was being given for the fact that the pulp mills' energy needs were in fact renewable and not dependent on fossil fuels and that pulp is fed directly into the viscose process without incurring any transport or drying costs.
In the viscose process, gaseous effluent control and treatment is a fundamentally important part of the overall process and is continuously improving as the technology of the "closed box" process evolves.
The samples studied in this investigation were five commercially available regenerated cellulose tubular films of about 28 [[micro]meter] thickness, prepared according to the
viscose process (3, 8, 9), by varying the manufacture conditions as referred previously (3) in order to obtain materials with different degrees of crystallinity.
according to the
viscose process. In the
viscose process a viscose solution is prepared by steeping pure cellulose in an aqueous concentrated caustic soda solution from which an alkali cellulose crumb is obtained.