Throttling device for a twin-shaft srew-type extruder
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United States of America Patent
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-
Sep 5, 1989
Grant Date -
N/A
app pub date -
Jul 26, 1988
filing date -
Aug 26, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A throttling device for a twin-shaft screw-type extruder, the housing of which is provided with bores parallel to one another and passing through one another forming saddles, has a transfer channel in each bore-defining wall, which channels are in a staggered arrangement relative to one another in the conveying direction. Retaining plates having cylindrical outer surfaces are arranged on the shaft mounted in each bore, which retaining plates can be arranged to overlap with the transfer channels so that no throttling action occurs. On the other hand, they can be brought partly to fully into axial overlapping with the wall of the respective cylindrical bores, whereby flow restricting gaps are formed between the cylindrical outer surface and each wall, the throttling effect of these gaps depending on the degree of overlapping. An operationally reliable throttling device having a linear characteristic is created by this development.
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