Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1976-04-13
1977-11-01
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 51, 264216, B29D 2704
Patent
active
040565955
ABSTRACT:
In the continuous production of rectangular foam slabs wherein a foamable reaction mixture is foamed on a forwardly moving floor web and lateral confining webs, and in which a cover web is applied during the foaming process to the surface of the rising foam, the improvement which comprises supplying said cover web from a supply to the surface under controllable tension, thereby exercising a controllable pressure on the surface of the rising foam, removing the cover web from the foam surface beyond the point at which the rising mixture has substantially reached its maximum height and passing the web rearwardly and then forwardly to serve as the floor web for receiving further foamable mixture. Advantageously the cover web is heated before application to the foaming mixture, it is pressed against the foam surface with a pressure of about 2 to 4 kilograms per square meter, it is removed from the foam surface about 2 to 4 meters downstream of where the foam mixture has reached its maximum height, and it is dried before it becomes the floor web. A corresponding apparatus is provided, with vertically adjustable transversely extending horizontal control members governing the locations where the cover web contacts and leaves the foam surface. The control members may be as long as the cover web is wide or they may be from about 15 to 25 cm shorter.
REFERENCES:
patent: 3233576 (1966-02-01), Voelker
patent: 3240655 (1966-03-01), Voelker
patent: 3240846 (1966-03-01), Voelker
patent: 3354503 (1967-11-01), Joseph et al.
patent: 3942925 (1976-03-01), Schmitzer et al.
patent: 3984195 (1976-10-01), Del Carpio
Anderson Philip
Metzeler Schaum GmbH
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