Filter cartridge or filter module consisting of flexible deep filter material
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United States of America Patent
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Dec 14, 1993
Issued Date -
N/A
app pub date -
May 5, 1992
filing date -
Apr 11, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A filter cartridge with a filter element inserted in a receiving space formed by a central cylindrical flow pipe 32 and a peripheral wall 34 is in terms of its possibilities of use and possibilities of adaptation to filtration problems substantially improved in that the filter element consists of fleece-like filter material and in that in its radial direction it comprises mutually enclosing zones of different filtering properties. For practical purposes, these zones can follow one another without any transition or they may be constructed with filtering properties which are varied in stepwise fashion. The filter element can be formed by the combination of a pleated filter fleece with a rolled-up filter fleece, the pleated part of the filter element being optionally on the inside or the outside. A rolled-up filter element or the rolled-up part of a filter element may be produced from a strip of fleece-like filter material, the said strip possibly having filtering properties which over its length are varied continuously or from portion to portion.
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