Process and apparatus for injection molding with melt filtration and mixing
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United States of America Patent
Stats
-
Sep 21, 1993
Grant Date -
N/A
app pub date -
Aug 6, 1992
filing date -
Oct 6, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A process and apparatus for injection molding of plastic material incorporate a perforated member for melt filtering and/or melt mixing during metering of plasticized material. The perforated member may be of a disk form mounted to a screw plunger provided within a machine body with the perforations arranged around the screw plunger. Impurities accumulated at the perforated member may be purged by rotating the screw plunger from a nozzle connected to the machine body via an annular recess formed at an inner surface of the machine body or directly from the machine body per se via a radial hole formed therein, when the screw plunger is in a predetermined position preferably in the most forward position, where the recess or the hole is located in the vicinity of the perforated member.
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