Rotatable filter system for filtration of a flowing substance
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United States of America Patent
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Jul 10, 2001
Grant Date -
N/A
app pub date -
Apr 10, 2000
filing date -
Aug 21, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A filter and a method for filtration is based upon moving a filter surface that is caused to move through a first filtration region (FF) for separation of a prefiltrate and through a second filtration region (KF) for separation of a clear filtrate. A vacuum is applied on the filtrate side of the filtration region (KF). The filtrate region (FF) has two filtration zones (FF.sub.1 and FF.sub.2) with mutually different pressure conditions. The filtration zone FF.sub.1 has atmospheric pressure and the filtration zone FF.sub.2 has a pressure that is lower than the pressure of FF.sub.1. The pressure change between the filtration zones (FF.sub.1 and FF.sub.2) occurs in the pre-filtrate region, i.e., before the filter surface has reached the filtrate region (KF).
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