Abstract: Polyvinyl alcohol is processed into fiber or pellets for further processing, or directly into water-soluble film, in a screw-and-barrel extruder, which has a slow temperature rise and a mild kneading action achieved by a non-stick coating applied to the screw.
Type:
Grant
Filed:
January 10, 1997
Date of Patent:
June 27, 2000
Assignee:
British Technology Group Inter-Corporation LIC LIM