Method and apparatus for impregnating a porous substrate with fo

Details Method and apparatus for impregnating a porous substrate with fo Method and apparatus for impregnating a porous substrate with fo

1982-06-14

1991-04-16

Lawrence, Evan K.

Coating processes

Application to opposite sides of sheet, web, or strip

427243, 8477, 68200, 118 44, 118410, 118411, 118415, B05D 126, B05D 306, B05C 300, B05C 318

Patent

active

050081314

ABSTRACT:
A method and apparatus for impregnating a pourous substrate with foam the method comprising transporting the porous substrate through a nip region defined by a moving foraminous surface such as a rotating foraminous drum and a foam discharge head, the foam discharge head comprising one or more discharge openings, where the transport of the porous substrate through the nip region causes the porous substrate to be compressed as it passes the discharge openings, and supplying foam to the discharge head with pressure sufficient to discharge foam through the discharge openings to impregnate the porous substrate. A surface support conveyor is positioned between the foraminous surface and the porous substrate.

REFERENCES:
patent: 3084661 (1963-04-01), Roberts
patent: 3533834 (1970-10-01), Marzocchi
patent: 3969780 (1976-07-01), Henderson
patent: 4023526 (1977-05-01), Ashmus et al.
patent: 4188355 (1980-02-01), Graham et al.
patent: 4237818 (1980-12-01), Clifford et al.
patent: 4288475 (1981-09-01), Meeker
patent: 4305169 (1981-12-01), Vidalis
"Foam Processing for Dyeing and Finishing", Shirley Institute Publication S42, Apr. 15, 1981, Didsbury, Manchester, U.K.

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