Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Patent
1995-05-05
1996-10-29
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
264169, 26421123, 264349, 366 83, 425204, 425205, 425208, B29C 4772, B29C 4792
Patent
active
055694292
ABSTRACT:
An apparatus provided for extruding a polymer in an extruder barrel having an upstream portion and a downstream portion with a discharge port. A hopper is positioned for delivering polymer to the upstream portion of the extruder barrel and a screw shaft is mounted for rotational movement in the extruder barrel. A drive means is connected for rotating the screw shaft. The screw shaft has a conveying screw flight and a metering screw flight arranged for conveying and metering the polymer through the barrel. A seal is provided for sealing against polymer flow and includes at least two different passageways positioned between a seal barrel and at least one seal shaft mounted for rotational movement within the seal barrel. The passageways are oriented to urge the polymer toward the screw shaft.
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Miller Austin R.
Randcastle Extrusion Systems, Inc.
Thurlow Jeffery R.
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