Micro/ultrafiltration membranes with a fixed pore size formed th

Details Micro/ultrafiltration membranes with a fixed pore size formed th Micro/ultrafiltration membranes with a fixed pore size formed th

1988-12-16

1990-05-08

Sever, Frank

Liquid purification or separation

Filter

Material

291638, 21050026, B01D 1300, B01D 1304

Patent

active

049236083

ABSTRACT:
Flat membranes from foils of organic polymers, glass or ceramic materials have pores tapering in funnel-shaped fashion, with a fixed pore size and a pore size distribution of less than 10% and an arrangement of the pores in a pattern of adjacent rows, wherein the average pore diameters range from 0.05 to 10 .mu.m and the pore patterns are evenly arranged in a regularly bounded area and, between the individual pores, have remaining webs with varying heights in the plane parallel to the increase in thickness of the foil material. It is manufactured through erosion of the pores by use of one or more intensity-modulated laser beams and continuous transport of the foil past the laser or lasers, with a pulse duration ranging from 1 to 1000 ns.

REFERENCES:
patent: 3303085 (1967-02-01), Price et al.
patent: 3612871 (1971-10-01), Crawford et al.
patent: 3617702 (1971-11-01), Flournoy
patent: 4032743 (1977-06-01), Erbach et al.
patent: 4141838 (1979-02-01), Schilling
patent: 4297559 (1981-10-01), Whitman, III
patent: 4652412 (1987-03-01), Chiulli
patent: 4680442 (1987-07-01), Bauer et al.
patent: 4699637 (1987-10-01), Iniotakis et al.
Patent Abstracts of Japan Sec. M, vol. 11, 1987, No. 74, M-568 No. 61-229492.
Le Journal de Physique 1985, No. 5, 46, pp. 883-885.

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