Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By gas forming or expanding
Patent
1981-06-18
1983-10-11
Anderson, Philip E.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By gas forming or expanding
264176R, 264DIG5, 425208, 425209, 425817C, 521145, B29D 2700
Patent
active
044091656
ABSTRACT:
Cellular thermoplastic resin is made by the method and extrusion apparatus that is characterized by a compaction section where the resin is densified, a choke section where a barrier of the densified resin is formed that is substantially impervious to a gaseous blowing agent, and a mixing section where the particulate resin is mixed with a blowing agent and then melted before being extruded into a zone of lower pressure whereby the blowing agent expands to form the cellular product. By mixing the blowing agent with a solid rather than a molten resin, the resulting mixture can be melted at a substantially lower temperature.
REFERENCES:
patent: 2928130 (1960-03-01), Gray
patent: 3310617 (1967-03-01), Dygert et al.
patent: 3366580 (1968-01-01), Kraemer et al.
patent: 3444283 (1969-05-01), Carlson
patent: 3451103 (1969-06-01), Aykanian et al.
patent: 3538203 (1970-11-01), Overcashier et al.
patent: 3666386 (1972-05-01), McElroy et al.
patent: 3787542 (1974-01-01), Gallagher et al.
patent: 3814779 (1974-06-01), Wiley
patent: 3940467 (1976-02-01), Brachman
patent: 3956438 (1976-05-01), Schippers
patent: 4118163 (1978-10-01), Lee
patent: 4181647 (1980-01-01), Beach
patent: 4185060 (1980-01-01), Ladney
Anderson Philip E.
Kap George A.
The B. F. Goodrich Company
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