Extrusion apparatus and methods of extrusion
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United States of America Patent
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Oct 5, 1993
Grant Date -
N/A
app pub date -
Sep 3, 1992
filing date -
Sep 3, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Extrusion apparatus and a method of extruding in which an extrusion screw terminates close to a breaker plate so that an annular passage surrounding the screw extends to the breaker plate. The breaker plate has flow apertures arranged around an edge region of the plate for direct communication with the annular passage. The flow passage arrangement decreases in cross-sectional area in a downstream direction whereby plastics materials do not become static in certain regions. Plastics degradation, particularly for PVC, is therefore avoided.
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