Barrier screw
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United States of America Patent
Stats
-
Aug 25, 1992
Grant Date -
N/A
app pub date -
Aug 30, 1991
filing date -
Aug 31, 1990
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A barrier screw having a feed zone, a compression zone and a metering zone, the screw including a shaft, a main flight provided on the shaft and a subflight provided on the shaft. The subflight is developed on the compression zone and then joins with a rear surface of the main flight prededing the subflight by one pitch at an end portion of the metering zone. The subflight defines a melt channel whsoe depth is substantially constant, so that the mixing function of the screw is improved.
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Cited Art Landscape
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