Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – And means to form or reshape preform
Patent
1983-09-02
1985-05-07
Hoag, Willard E.
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
And means to form or reshape preform
249 66R, 249117, 249122, 425127, 425130, 425129R, 425556, B29C 100, B29G 100
Patent
active
045155437
ABSTRACT:
A method and apparatus are disclosed for in-mold coating plastic parts which find particular utility in compression molding sheet molded compound (SMC) exterior automotive body panels. The mold members are configured so as to provide a down turned flange for the part at its outer extremities. The male mold member includes an undercut portion for securing the part to the male mold when the female mold is raised to allow injection of the coating material. The part is ultimately ejected from the male mold by way of blades which press upwardly on the down turned flange thereby lifting it from its undercut portion and releasing the part from the mold. By confining the ejector blade contact to the flange, extremely smooth, high quality finishes for the major surface of the part can be achieved.
REFERENCES:
patent: 3555606 (1971-01-01), Hedgewick
patent: 3669598 (1972-06-01), Tucker
patent: 3712787 (1973-01-01), Barnes
patent: 3776676 (1973-12-01), Kessler
patent: 3893644 (1975-07-01), Drazick
patent: 3982875 (1976-09-01), Abey
patent: 4009978 (1977-03-01), Hanning
patent: 4009979 (1977-03-01), Martin
patent: 4061455 (1977-12-01), Von Holdt
patent: 4403933 (1983-09-01), Davis et al.
patent: 4438062 (1984-03-01), Griffith et al.
"Class A Finish on SMC", Bernie Miller, Plastics World, Mar. 1978, p. 48.
Hoag Willard E.
The Budd Co.
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