Multiple-stage plasticating extruders
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United States of America Patent
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-
Jan 20, 1987
Grant Date -
N/A
app pub date -
Jun 12, 1985
filing date -
Jun 12, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Plasticating extruders in which increased melting effectiveness is attained through multiple stages including at least one inner screw conveyor within an outer screw conveyor in a barrel for receiving unmelted solid material from the channel of the outer screw conveyor and conveying the received unmelted solid material in the channel of the inner conveyor in a direction parallel to and axially coextensive with the direction of travel of the material in the channel of the outer screw conveyor and melting the received unmelted solid material to bring melted material to a downstream location where the melted material from both channels merges to deliver a flow of fully melted material to a downstream discharge outlet. A vent may be located in the barrel in the vicinity where material enters the channel of the inner screw conveyor for improved venting as a result of the diversion of material away from the vent.
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