Method of producing molded parts with a smooth noncellular skin

Details Method of producing molded parts with a smooth noncellular skin Method of producing molded parts with a smooth noncellular skin

1975-11-24

1978-05-30

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 88, 264328, 264DIG14, 264DIG83, B29D 2700

Patent

active

040923851

ABSTRACT:
A method of injection molding foamed articles wherein, after the mold is closed and while the mold is held closed, a gas counterpressure is generated within the mold cavity against which a portion of the foamable resin is injected under a pressure which prevents foaming. Thereafter, a shape-forming element adapted to be retracted to be flush with a wall of the mold cavity in the final phase thereof, is advanced to force the nonfoamed material, still against the gas counterpressure, into the remainder of the cavity. After a skin has formed, on the mass within the mold cavity the latter element is retracted to permit foaming, preferably after foaming has been initiated by allowing a portion of the foamable mass to recede into the injection cylinder during the inception of the foaming process.

REFERENCES:
patent: 2530289 (1950-11-01), Cook
patent: 2829117 (1958-04-01), Lindemann
patent: 3029472 (1962-04-01), Fischer
patent: 3058161 (1962-10-01), Beyer et al.
patent: 3268635 (1966-08-01), Kraus et al.
patent: 3694529 (1972-09-01), Josephsen et al.
patent: 3773873 (1973-11-01), Spaak et al.
patent: 3776989 (1973-12-01), Annis et al.

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