Extruder venting system with vacuum shuttle valve
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United States of America Patent
Stats
-
Jun 3, 1997
Grant Date -
N/A
app pub date -
Apr 20, 1995
filing date -
Apr 20, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides a barrel venting system for use on an extruder. Gases that are generated during plasticizing are drawn by vacuum through a filter to remove plastic particles before the gas is exhausted to the atmosphere. To enable cleaning of the filter without interrupting extruder operation, a shuttle valve is provided to allow rapid switching of the gas flow to a second filter. The valve itself includes two disc shaped elements with ports that align in two positions to enable flow to either the first or second filter, as desired.
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Cited Art Landscape
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