Feed screw
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United States of America Patent
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-
Oct 5, 1999
Grant Date -
N/A
app pub date -
Jun 11, 1997
filing date -
Jun 11, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved feed screw for injection molding machines has a metering section adjacent to the outlet having primary flights formed by a helical thread. The primary flights form primary channels therebetween for passage of the material. The primary channels are intersected by mixing flights formed by another helical thread having a hook shaped starting point extending from a main flight at the start of the metering section that continues in a general alignment with the primary flights. The mixing flights divide the primary channel into two secondary channels. The mixing flights include alternating oriented angular notches cut therethrough to provide passageway for the material between the two secondary channels to move in a general serpentine path.
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