Thermoplastic mold for rotational molding

Details Thermoplastic mold for rotational molding Thermoplastic mold for rotational molding

1990-11-23

1992-03-10

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Female mold including tamping means or means utilizing mold...

Including means imparting diverse motion

2491141, 249134, 264310, 264337, 425435, 425547, B29C 3502, B29C 4104, B29C 4106

Patent

active

050946072

ABSTRACT:
A plastic mold (A, B) for rotational molding are disclosed. The plastic mold, used in lieu of a conventional metal mold, is constructed from a fiber (52) reinforced thermoset plastic resin (50) having a heat distortion point above the melt point of the thermoplastic polymeric material from which an article is molded. Metal (64, 70, 74) or other dissimilar material may be used to provide different coefficients of heat transfer at preselected portions of mold (A, B). The entire mold may include a thermal coefficient modifier to increase the heat transfer rate of the mold uniformly over the entire mold in addition to the preselected portions.

REFERENCES:
patent: 3349836 (1967-10-01), Rossi
patent: 3827667 (1974-08-01), Lemelson
patent: 4049767 (1977-09-01), Vaidya
patent: 4105184 (1978-08-01), Sumitomo
patent: 4225109 (1980-09-01), Yotsutsuji et al.
patent: 4247279 (1981-01-01), Masters
patent: 4292615 (1981-09-01), Hritz
patent: 4705468 (1987-11-01), LeBreton
patent: 4781569 (1988-11-01), Kinugasa et al.
patent: 4834929 (1989-05-01), Dehoff et al.

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