Tubular filtration element and method of making it

Details Tubular filtration element and method of making it Tubular filtration element and method of making it

1977-02-17

1978-07-18

Sever, Frank

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

2104971, 210500M, B01D 2700, B01D 2906

Patent

active

041014235

ABSTRACT:
A tubular element for removing particulate matter and bacteria of dimensions in excess of a predetermined value from a fluid flowing from the interior to the exterior of the filtration element has a first inner layer of a highly porous material that has a low coefficient of sliding friction, and a second layer of a microporous filtration material having pores of substantially uniform size. The element may include an outer support layer of a porous material that is not subject to shedding. In a preferred form, the inner layer is formed from a high wet strength paper, the microporous filtration layer has sufficiently small pores to remove all bacteria from the fluid, and the outer layer may be a fine porous plastic sheet material or a high wet strength, high porosity paper that is impregnated with the polymeric material that forms the microporous filtration material. The fine pore structure of the outer layer supports the fragile filtration layer. In a preferred form, both ends of the tubular element are impregnated with a suitable sealing material such as a polyurethane potting compound. The ends are preferably dipped in the sealing material to a predetermined depth. When cured, these end portions provide additional mechanical support for the tube ends and block the passage of particulate matter and bacteria past the filtration layer at its edge. A fabrication process for the filtration element that does not damage the fragile microporous filtration layer involves helically wrapping the inner layer on a fixed mandrel to act as a carrier, and helically wrapping an overlying layer of the microporous filtration material. If an outer layer is used this is wrapped on the microporous material. All layers move in unison along the longitudinal axis of the mandrel. Each layer is self-overlapping and at least the filtration layer is sealed in the area of the overlap.

REFERENCES:
patent: 3341024 (1967-09-01), Lowe et al.
patent: 3376180 (1968-04-01), Larson et al.
patent: 3773181 (1971-07-01), Calderwood
Membrane Digest, vol. 1, No. 3, 1972 (Fall), U.S. Dept. of Interior, Office of Saline Water.

Affiliated with

Also associated with

Rating

Tubular filtration element and method of making it does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Tubular filtration element and method of making it, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tubular filtration element and method of making it will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-337905