Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – Molding of thermosetting or cross-linking stock
Patent
1981-06-29
1983-01-25
Pavelko, Thomas P.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
Molding of thermosetting or cross-linking stock
2643282, 2643287, 425548, 425549, 425575, 425590, B29G 300
Patent
active
043701230
ABSTRACT:
The apparatus of the present invention includes a stationary assembly and a movable assembly. The stationary assembly is comprised of a stationary platen which has a heat plate, a temperature-controlled sprue bushing and a mold face positioned thereon. The movable assembly is comprised of a movable platen which has a heat plate mounted thereon and a mold face, corresponding to, and adapted to be aligned with, the mold face on the stationary assembly to form a partially open mold cavity. Means are provided to feed a supply of thermosetting molding material through the sprue bushing into the partially open mold cavity. Means are provided to completely close the mold cavity and place the apparatus in a compression stage. In the injection and in the compression stages, the discharge end of the sprue bushing is in direct feed relationship with the mold cavity, allowing flow of molding material from the sprue bushing into the mold cavity in the injection stage and flow of molding material from the mold cavity into the sprue bushing in the compression stage. Means are also provided for the subsequent retraction of the movable assembly to allow removal of a molded article and access to the mold area.
REFERENCES:
patent: 3787159 (1974-01-01), Bielfeldt
patent: 3797984 (1974-03-01), Yago
patent: 3819312 (1974-06-01), Arpajian
patent: 4012386 (1977-03-01), Davis
patent: 4017242 (1977-04-01), Mercer
patent: 4091057 (1978-05-01), Weber
Bainbridge Robert W.
Dannels W. Andrew
Gosz William G.
Mudd James F.
Occidental Chemical Corporation
Pavelko Thomas P.
Tao James F.
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