Polymer filter with backflush pump
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United States of America Patent
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-
Aug 25, 1992
Grant Date -
N/A
app pub date -
Jun 7, 1991
filing date -
Jun 7, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A filter for flowing polymer having a filter element progressively advanced between an on-stream position communicating between the upstream and downstream passages and a backflush position. In the latter position, filtered polymer is forced through a segment of the element in the direction opposite to on-stream flow. The filter is advanced in steps alternately with the energization of a pump for creating the backflush pressure. The steps are determined to cause each filter portion to remain in the backflush position for at least two consecutive steps.
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