Abstract: An improved fiber washer provides for a water recirculation technique which assists in moving the fibers through the washer and assists in the separation of heavy debris from the fibers.
Type:
Grant
Filed:
October 22, 1984
Date of Patent:
January 13, 1987
Assignee:
Process Evaluation and Development Corp.
Inventors:
Eduardo J. Villavicencio, Jorge E. Arana
Abstract: A dissolving pulp suitable for preparing rayon having a degree of polymerization of greater than about 800 can be produced using bagasse by a sodium hydroxide-sodium sulfite digestion at a ph of about 10.5 to 11.5 and preferably about 10.8 to 11.2 and a caustic-sulfite weight ratio of 1:1 to 1:3 followed by a bleaching sequence of DcEDH or DcEDD. This results in a high purity low silica content fiber which has undergone very little degradation.