Double-screw extruder
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United States of America Patent
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May 13, 1997
Issued Date -
N/A
app pub date -
Jun 3, 1996
filing date -
May 24, 1995
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A screw for a double-screw extruder has its flight defining an outer cone and an inner cone of different convergencies with the inner cone converging more steeply than the outer cone from the feed end to the exit end of the extruder. Where A is the outer diameter at the feed end, B is the outer diameter at the exit end, C is the flight height at the feed end and D is the flight height at the exit end, the screw is defined by the relationship m.times.(A-B)/B=(C-D)/D where m is less than zero and greater than -0.75, the screw having a length L.gtoreq.15B.
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