Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1978-01-05
1979-05-01
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 466, 264 51, 264216, 264DIG84, 4254519, 425817C, B29D 2704
Patent
active
041523857
ABSTRACT:
Two opposed endless conveyor belts, together with side dams respectively mounted on the conveyor belts form a molding tunnel for producing a continuous sheet of foamed and cured resin. A cover sheet, usually of paper, is provided between the molding surfaces of the side dams and conveyors and the product being formed. The side dams are movable toward and away from an abutting surface of the conveyor opposite to the one that they are mounted on so as to clamp the paper therebetween and prevent leakage of foam. A mechanism, particularly a spring bias and cam track, is provided to release the paper clamping pressure to permit the foaming resin briefly to permit the expanding resin to move the paper into conformity with the molding tunnel. The points along the length of the molding tunnel wherein this release occurs are adjustable as desired.
REFERENCES:
patent: 3093232 (1963-06-01), Kornylak
patent: 3249486 (1966-05-01), Voisinet et al.
patent: 3734668 (1973-05-01), Porter
patent: 3812227 (1974-05-01), Blackwell et al.
patent: 3943215 (1976-03-01), Grune et al.
patent: 4046611 (1977-09-01), Sanson
Anderson Philip
Beall, Jr. Thomas E.
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