Method of forming a sealing gasket for reticulated foam filter

Details Method of forming a sealing gasket for reticulated foam filter Method of forming a sealing gasket for reticulated foam filter

1989-03-10

1990-09-18

Simmons, David

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 464, 264275, 264DIG48, B29C 6722

Patent

active

049576720

ABSTRACT:
A sealing gasket of foamed plastic is formed at the edge of a filter element of reticulated foam by placing the filter element on a surface adjacent to an open receptacle contoured as a mold for the desired shape of the gasket, filling the receptacle with a foam-forming liquid and avoiding contact between the liquid and the filter element until the liquid begins to froth. The liquid is then permitted to froth and overflow the receptacle on the side facing the filter element. As the froth contacts the filter element and proceeds to cure, it bonds to the edge of the elements without substantially penetrating its open pore network. The result upon curing is a gasket along the edge of a filter element fully bonded thereto without gaps or bypass, yet leaving substantially all of the surface area of the filter element exposed for use as a filter.

REFERENCES:
patent: 3183285 (1965-05-01), Boylan
patent: 3929948 (1975-12-01), Welch et al.
patent: 4138283 (1979-02-01), Hanusa
patent: 4631077 (1986-12-01), Spicer et al.

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