Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1983-11-15
1985-04-09
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264101, 264DIG9, 264DIG15, 34 92, B29D 2700, F26B 1330
Patent
active
045101060
ABSTRACT:
A process of pre-foaming blowing agent-containing plastic materials, in which the plastic material particles which have been pre-foamed by the addition of heat are transferred without an intermediate resting stage from a sealed pre-foaming chamber into a drying and stabilizing chamber, with a vacuum being maintained during the drying and stabilizing operation.
An apparatus for the performance of the process includes a pre-foaming chamber, beneath which there is provided a chamber in which the pre-foamed plastic material is dried and stabilized. The charging opening of the drying and stabilizing chamber is directly under the discharge opening of the pre-foaming chamber and is hermetically sealable by means of a slide valve.
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patent: 3013996 (1961-12-01), Pollard et al.
patent: 3126432 (1964-03-01), Schuur
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patent: 3347961 (1967-10-01), Russell
patent: 3577360 (1971-05-01), Immel
patent: 3631133 (1971-12-01), Battigelli
patent: 3963816 (1976-06-01), Smith
patent: 4272469 (1981-06-01), Smith
Anderson Philip
Lewen Bert J.
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