Method of producing hollow fiber polymer membranes

Details Method of producing hollow fiber polymer membranes Method of producing hollow fiber polymer membranes

1997-11-28

1999-11-09

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

264 51, 2642093, 2642095, 264235, 264563, D01D 5247

Patent

active

059807954

ABSTRACT:
In a method of producing hollow fiber membranes, wherein a molten polymer charged with a gas under pressure is provided in an extrusion apparatus, the polymer melt including the gas under pressure is extruded from the extrusion apparatus through a hollow fiber-forming extrusion nozzle with a predetermined pressure drop which provides for a concurrent expansion of the gas contained in the polymer melt thereby forming a porous hollow fiber membrane.

REFERENCES:
patent: 1487807 (1924-03-01), Rousset
patent: 3095258 (1963-06-01), Scott
patent: 3745202 (1973-07-01), Riggleman et al.
patent: 3873653 (1975-03-01), Meinecke et al.
patent: 4164603 (1979-08-01), Siggel et al.
patent: 5232642 (1993-08-01), Kamo et al.
Abstract of Japan 1-14,315 (Published Jan. 18, 1989).

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