Process of producing multiple-layer filter medium

Details Process of producing multiple-layer filter medium Process of producing multiple-layer filter medium

1986-04-09

1988-01-12

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Recycling of reclaimed or purified process material

Of gaseous process material

210496, 2105101, 264 43, 264 60, 264302, 264308, B28B 126, B29B 1700

Patent

active

047190582

ABSTRACT:
A process of producing a multiple-layer filter medium comprising a porous support and a filtering layer formed on one of opposite surfaces of the porous support. The process includes the steps of: immersing the porous support in a liquid, to fill pores in the porous support with the liquid and thereby remove a gas from the pores; preparing a suspension containing particles to form the filtering layer; disposing the porous support such that the above-indicated one surface is exposed to a flow of the suspension, and partially defines a conduit through which the suspension flows; holding the other surface of the porous support under a first pressure lower than a second pressure acting on the above-indicated one surface, and effecting the flow of the suspension in contact with the above one surface for a predetermined time, to permit the particles in the flow to be deposited on the above one surface, thereby forming the filtering layer; draining the conduit of the suspension, and introducing into the conduit a gas having a third pressure higher than the first pressure, and to thereby remove aqueous components from the porous support and the filtering layer; and firing the porous support and the filtering layer.

REFERENCES:
patent: 1963030 (1934-06-01), Powell
patent: 3243860 (1966-04-01), Whittaker et al.
patent: 3274307 (1966-09-01), Bergstein et al.
patent: 3309438 (1967-03-01), Bergstein et al.
patent: 4088576 (1978-05-01), Mott
patent: 4356215 (1982-10-01), Auriol et al.
patent: 4606805 (1986-08-01), Bon
patent: 4647376 (1987-03-01), Galaj

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