Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Female mold type means
Patent
1993-06-01
1994-12-27
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
Female mold type means
4251291, 425556, 425590, B29C 4540, B29C 4564
Patent
active
053759893
ABSTRACT:
A plastic molding device for plastic molding a semiconductor element includes upper mold and lower molds, each mold having a plurality of cavities, injection passages for injecting plastic into the cavities, and eject pins for ejecting plastic molded semiconductor elements from the cavities; a plastic injecting mechanism for injecting plastic into the cavities; and a mold driving mechanism for driving the upper or lower molds to join and separate them. The plastic molding device further includes a pin driver for projecting the eject pin after injection of the plastic into the cavities is completed while the upper and lower molds are together. Therefore, shrinkage deformation on a surface of the plastic molded product is prevented, whereby a plastic molded semiconductor device having a smooth surface is produced.
REFERENCES:
patent: 3156014 (1964-11-01), Wenger
patent: 3669598 (1972-06-01), Tucker
patent: 4231987 (1980-11-01), Osawa et al.
patent: 4915608 (1990-04-01), Tsutsumi et al.
patent: 5074779 (1991-12-01), Tsutsumi et al.
Heitbrink Tim
Mitsubishi Denki & Kabushiki Kaisha
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