Method and device for forming plastic cellular material in a mol

Details Method and device for forming plastic cellular material in a mol Method and device for forming plastic cellular material in a mol

1979-06-04

1981-08-25

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By gas forming or expanding

249165, 264 404, 264101, 264321, 425140, 425405R, 4254519, 425812, 425817R, 425DIG60, B29D 2704

Patent

active

042858933

ABSTRACT:
In the course of this method, an amount of expansible mixture is poured into a mould, after which the mould is obturated by means of a plug. A vacuum is created in the chamber of the mould by way of the plug so as to cause the foaming of the mixture. The vacuum is maintained for a period after the foamable mixture has filled the whole of the volume of the mould. At the end of the polymerization of the foamable mixture, the vacuum may be re-applied in the mould, preferably for several cycles, so as to cause the cells of the foam obtained to burst.

REFERENCES:
patent: 3070126 (1962-12-01), Schneider
patent: 3131426 (1964-05-01), Legler
patent: 3267517 (1966-08-01), Altermatt
patent: 3317641 (1967-05-01), Heier
patent: 3475525 (1969-10-01), Peters
patent: 3608023 (1971-09-01), Scarborough
patent: 3640663 (1972-02-01), Hampel et al.
patent: 3664786 (1972-05-01), Devine
patent: 3833694 (1974-09-01), Hughes
patent: 3865532 (1975-02-01), Sakuma
patent: 3878279 (1975-04-01), Sorrells
patent: 3903223 (1975-09-01), Van Der Hoek
patent: 3970732 (1976-07-01), Slaats et al.
patent: 4045527 (1977-08-01), Babayan et al.
Ferrigno, T. H., "Rigid Plastics Foams, " New York, Reinhold, .COPYRGT.1963, pp. 42-46.

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