Gear pumps
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United States of America Patent
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-
Feb 16, 1988
Grant Date -
N/A
app pub date -
Dec 18, 1985
filing date -
Jan 5, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
To avoid areas of slow moving or stagnant polymer in a gear pump feeding from an extruder to a die, the inlet port (7) has its cross-section changing progressively from that of the outlet (10) of the extruder to a slot section (11) at the demeshing region of the gear teeth, the slot section having a breadth at least equal to the breadth of the gears (3, 4) and a height between one and four times the gear teeth height, and the outlet port (8) preferably changes progressively from a similar slot section (16) at the meshing region of the gear teeth to the cross-section of the inlet (17) of the die.
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