Liquid filter of spiral wound construction with alternate layers

Details Liquid filter of spiral wound construction with alternate layers Liquid filter of spiral wound construction with alternate layers

1987-06-15

1989-10-31

Fisher, Richard V.

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

210496, 2104971, 2104972, 210505, 55487, 55498, 55520, 55527, B01D 2704

Patent

active

048775274

ABSTRACT:
A liquid filter cartridge includes a centertube and a filtering media wrapped circumferentially about the centertube to provide a spirally wrapped media. The media includes a surface-type filtering medium having a predetermined porosity and a depth-type filtering medium which is disposed between the wraps of the surface-type filtering medium. The surface-type filtering medium is a filtering paper, and the depth-type filtering medium is an air laid batt which includes structural fibers tending to support the surface-type medium and to prevent the latter from collapsing under dynamic flow conditions. The depth-type medium is porous and offers little resistance to fluid flow, so that the liquid to be filtered can easily flow both radially from one of the layers of the surface-type medium to the adjacent layer, and also can flow circumferentially to thereby permit access for the liquid to be filtered over the entire area of the inner wraps of the surface-type medium.

REFERENCES:
patent: 1898027 (1933-02-01), Winslow
patent: 2427733 (1947-09-01), McCann
patent: 2577169 (1951-12-01), Von Pentz
patent: 2742160 (1956-04-01), Fogwell
patent: 3095370 (1963-06-01), Krogman
patent: 3807570 (1974-04-01), Allan
patent: 4032457 (1977-06-01), Matchett
patent: 4092246 (1978-05-01), Kummer
patent: 4102785 (1978-07-01), Head et al.
patent: 4160059 (1979-07-01), Sanejima
patent: 4555342 (1985-11-01), Grant
patent: 4564376 (1986-01-01), Billiet

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