Process and apparatus for two stage treatment of plastic materials
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United States of America Patent
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Aug 16, 1994
Grant Date -
N/A
app pub date -
May 5, 1992
filing date -
Jun 6, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In the preparation and production of plastic materials by a continuously operating double shaft screw-type extruder, the efficiency of production often depends on good delivery of material to the extruder. In accordance with the invention for processing various types of plastic materials, a primary stage is mounted in a pressure-tight sealed manner on the housing of the extruder, the primary stage being formed by a vertical double conical container in which a pair of screw-type helices are rotatably supported and driven from above. The helices are connected to two replaceable feed elements at their lower ends so that delivery of material to the extruder is achieved without any intermediate dead spaces.
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