Method of cleaning a sintered powdered metal filter

Details Method of cleaning a sintered powdered metal filter Method of cleaning a sintered powdered metal filter

1995-01-11

1996-01-30

Kim, John

Liquid purification or separation

Processes

Separating

210749, 210797, 210798, 134 2216, 134 2217, 134 2218, 134 2219, 134 26, 425225, B01D 2962

Patent

active

054878365

ABSTRACT:
A method of cleaning polymer residue from a polymer melt filter formed of a sintered powdered metal includes pyrolyzing the polymer residue-contaminated filter within a heated chamber at a temperature within the range from about 400.degree. to about 600.degree. C. and for a time sufficient to pyrolyze substantially all of the polymer residue. Simultaneously with such treatment, the heated chamber is flushed with steam to prevent combustion of the polymer residue. The pyrolyzed filter is then treated with a solvent and back-flushed with a pressurized fluid stream by passing the fluid steam through the filter in a direction opposite to the polymer melt flow therethrough.

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patent: 5240613 (1993-08-01), Tsuchitani et al.
patent: 5246589 (1993-09-01), Nichols et al.
Chemiefasern/Textilindustrie, vol. 34/86 (Jun. 1984), pp. 409-411 translated by J. Cornelsen.
Engineering Report No. 1-12 by Fuji Filter Manufacturing Co., Ltd., Charlotte, N.C. (Jan. 1992).
R. E. Duffy, "Basic Methods for Removing Polymer from Parts", International Fiber Journal (Jun. 1991).
F. Fourne, Chemiefasern/Textilindustrie, vol. 35/87 (Jun. 1985), pp. 397-403.
F. Fourne, Kunststoffe, 79 (1989) 9, pp. 807-813.

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