Extruder screw having multi-channeled barrier section
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United States of America Patent
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-
Oct 31, 2000
Grant Date -
N/A
app pub date -
Sep 3, 1999
filing date -
Sep 3, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
An axially elongated extruder screw includes a screw body having an axially extending extruding portion defined by a feed section at an inlet end of the screw, a metering section at an outlet end of the screw and a barrier section between the feed and metering sections. A first helical primary flight extends continuously about and is coaxial with the screw body substantially along the entire length of the extruder screw. A second helical primary flight extends continuously at least part-way along the feed section to the outlet end of the extruder screw. The barrier section of the extruder screw defines first and second barrier flights positioned between the primary flights and cooperating therewith to form first and second melt and solids channels that extend along the barrier section of the extruder screw.
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