Foam molding method and mold assembly therefor

Details Foam molding method and mold assembly therefor Foam molding method and mold assembly therefor

1990-09-11

1992-07-21

Dawson, Robert A.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 451, 264 464, B29C 6722

Patent

active

051320649

ABSTRACT:
A method of molding a foamed product is carried out by using a front and a rear mold for molding a front and a rear portion of the foamed product and a core interposed between the front and rear molds. The method includes steps of pouring or spraying one of foaming stock solutions onto a molding surface of the one mold, arranging the core in the one mold and pouring or spraying the other foaming stock solution onto the core or a molding surface of the other mold. The front and rear molds are closed at a moment when a lapse of time arrives at 30-100% of a rise time of the foaming stock solution later applied. Thereafter the closed molds are maintained in a position where an angle of the closed molds relative to a horizontal plane is within a range between 90.degree. and an angle more than 0.degree.. The front and rear molds are pivotally connected to each other with their one ends by means of a pivot shaft. The core is pivotally supported with its one end by a shaft arranged in parallel to the pivot shaft. The core is formed with a through-hole and said rear mold is provided with a protrusion to be hermetically fitted in the through-hole of the core.

REFERENCES:
patent: 3124627 (1964-03-01), Hood
patent: 3257149 (1966-06-01), Fruchte et al.
patent: 3327029 (1967-06-01), Pincus et al.
patent: 3408695 (1968-11-01), Scott
patent: 4190697 (1980-02-01), Ahrens
patent: 4405681 (1983-09-01), McEvoy
patent: 4714574 (1987-12-01), Tenhagen

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