Patents
United States Patent 6080346
Douris , ê et al. June 27, 2000
Extrusion apparatus and method and extruded thermoplastic polymer
Jack June 27, 2000
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.
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