Title:
TWIN SCREW EXTRUSION APPARATUS AND PRODUCTION METHOD FOR THE PRODUCTION OF POLYMERIC FOAM
Document Type and Number:
WIPO Patent Application WO2001015885
Kind Code:
A9
Abstract:
The invention provides a counter-rotating extrusion system (30) for processing foam material. The system is designed to introduce a physical blowing agent into the extruder, thoroughly disperse the blowing agent within the polymer melt and, preferably, to maintain relatively high pressures downstream from the point of blowing agent introduction. High quality polymeric foams, including microcellular foams, can be produced using the extrusion system (30). The system is particularly suitable for the production of foams using shear sensitive and degradable materials, such as PVC.
Inventors:
CHEN LEE
BLIZARD KENT
KIM ROLAND
BURNHAM TED
BLIZARD KENT
KIM ROLAND
BURNHAM TED
Application Number:
PCT/US2000/024252
Publication Date:
September 26, 2002
Filing Date:
August 31, 2000
Export Citation:
Assignee:
TREXEL INC (US)
International Classes:
B29C44/34; B29C48/67; B29C48/605; (IPC1-7): B29C47/40; B29C47/60
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