Liquid purification or separation – Filter – Within flow line or flow line connected close casing
Patent
1996-11-26
1998-05-26
Walker, W. L.
Liquid purification or separation
Filter
Within flow line or flow line connected close casing
210487, 210490, 2104971, 55368, 55376, 55380, B01D 2933, B01D 3916
Patent
active
057559627
ABSTRACT:
A prefilter bag for insertion into a standard filtration bag apparatus, having a filtration assembly comprising a seamless filter membrane having uniform pore openings preselected within the range of between about 2 and about 50 microns (.mu.) and a linearly channeled, non-deformable, semi-rigid liquid transport thermoplastic sheet in the form of a molded webbing or netting in contact with the upper surface of the filter membrane; said webbing having marginal edges which are coextensive with those of the membrane; said assembly adapted to be shaped by continuous winding of the assembly upon itself for 2 to 5 complete convolutions around a tubular mandrel so as to form a cylindrical tube or cone; the bottom of said cylinder being sealed to prevent liquid leakage and the top of said cylinder, forming a liquid inlet opening, being sealed to a retaining ring adapted to be inserted in, attached to or sealed to an outer, retaining ring of a non-wrapped filter bag. The inlet of the wrapped cylindrical bag is optionally fitted with vortex directing means to enhance a linearly tangential direction of the entering liquid against the walls of the inside membrane. The invention also pertains to a method for the fabrication and use of the present filtration bag.
REFERENCES:
patent: 4247394 (1981-01-01), Schmidt, Jr.
patent: 4545833 (1985-10-01), Tafara
patent: 4624784 (1986-11-01), Lefebvre
patent: 4877526 (1989-10-01), Johnson et al.
patent: 5075004 (1991-12-01), Gershenson et al.
patent: 5091085 (1992-02-01), Thalmann et al.
patent: 5417855 (1995-05-01), Gershenson
patent: 5620669 (1997-04-01), Plinke et al.
Elliott Robert S.
Gershenson Moshe
Malawer Edward G.
Pearson John
Davis William J.
ISP Investments Inc.
Maue Marilyn J.
Walker W. L.
Ward Joshua J.
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