Variable pressure screening
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Feb 19, 2002
Grant Date -
N/A
app pub date -
Sep 8, 2000
filing date -
Mar 11, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Pressure type screening apparatus for screening papermakers' stock and method of use is disclosed. Screen (20) has an inlet screening surface (23) and an outlet surface (unlabled). Pressure transducers (not shown) vary the fluid pressure on the inlet surface of the screen (23) from a maximum to a minimum, and also vary the fluid pressure on the outlet surface of the screen (20) from a minimum to a maximum at a repetitive cyclic rate. The amplitude of such pressures is such that flow reversal occurs through the screen (20) and any fiber mat that tends to form on the inlet surface (23) is disrupted or fluidized.
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