Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Patent
1981-04-02
1982-08-17
Pavelko, Thomas P.
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to heat or cool
425549, 425552, 425572, 425588, B29F 103, B29F 108
Patent
active
043447503
ABSTRACT:
This invention relates to an edge gated injection molding system. An electrically heated sprue bushing is seated in a well in the cavity plate with a centrally extending melt runner passage which branches radially outward with separate channels leading to a number of edge gates in the cavity plate. An air gap is provided to insulate the hot sprue bushing from the surrounding cooled cavity plate and a hollow seal is provided at each gate to convey the melt across the air gap. Each seal is in alignment with one of the channels and one of the gates, and has its inner end seated in a recess in the sprue bushing and its outer end abutting against the curved wall of the cavity plate. The outer ends of the seals are dome shaped so that they are slightly resiliently deformable. A portion of the wall of the cavity plate is slightly inwardly tapered so that at the gates, the effective combined diameter of the sprue bushing and the seals is slightly larger than that of the well. Thus, when the sprue bushing is inserted into the well, the seals are slightly deformed against the wall of the cavity plate. When the sprue bushing is heated to operating temperatures, further deformation occurs, which has the advantage of providing a pressure tight seal against the curved wall of the cavity plate to prevent leakage of the melt into the air gap.
REFERENCES:
patent: 4043740 (1977-08-01), Gellert
patent: 4222733 (1980-09-01), Gellert
patent: 4286941 (1981-09-01), Gellert
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