Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1981-01-23
1982-08-17
Anderson, Philip E.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
249 79, 264 54, 264DIG3, 264DIG5, 264DIG60, B29D 2700
Patent
active
043449034
ABSTRACT:
A cellular polymeric resin sheet, slab or the like is produced by filling a pressure resistant receptacle having a cover directly releasably locked thereto with a uniform mixture of a resin such as polyvinyl chloride, a finely divided heat activated first gas generator and preferably a water activated second gas generator together with other additives such as plasticizers, stabilizers, etc. The closed receptacle is heated to effect the gelation and fusion of the resin and the activation of the first gas generator to produce a high density uniform small pore cellular resin body embryo under high pressure in the receptacle. The receptacle and embryo are cooled, the receptacle opened and the embryo removed and subjected to a high humidity atmosphere, preferably at elevated temperature to activate the second gas generator and react therewith. The receptacle may be provided with passageways for the circulation of heating and cooling media and may be provided with heat transfer fins which strengthen the receptacle and is heated and cooled by immersion or exposure to hot and cold fluids. The receptacles may carry electric heating elements for their heating.
REFERENCES:
patent: 2100003 (1937-11-01), Foster
patent: 2219864 (1940-10-01), Dostal
patent: 2576749 (1951-11-01), Carpentier
patent: 3099516 (1963-07-01), Henrickson
patent: 3154606 (1964-10-01), Morecroft et al.
patent: 3375865 (1968-04-01), Boichenko et al.
patent: 3836110 (1974-09-01), Osinsky et al.
Anderson Philip E.
Miskin Howard C.
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