Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Producing multilayer work or article
Patent
1985-05-17
1987-01-06
Czaja, Donald
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Producing multilayer work or article
264276, 2643289, 264513, 264516, 425116, 425127, B29C 4514
Patent
active
046345655
ABSTRACT:
An injection mold for producing a plastic injection molding having a layer of plastic molding material on the front of a metallic support. The injection mold has a first mold half over the front of the support with a mold cavity therein for holding the injected plastic material which forms the layer on the front of the support. The injection mold has a second mold half at the rear of the support with another recess for being filled with pressure fluid for pressing the front of the support against the first mold half, which seals the cavity for the injected plastic molding material to prevent leakage and to keep the line of the plastic material layer around the mold cavity on the support sharp. The pressure fluid may be supplied to the rear of the support before the molding composition is injected into the cavity at the front of the support. The pressure fluid at the rear of the support may be the same material that is applied on the front of the support. The recess in the second mold half at the rear of the support is adjacent but alongside the cavity defined in the first mold half above the front of the support, and their adjacent edges are either directly one above the other or each slightly overlaps the other recess.
REFERENCES:
patent: 3493458 (1970-02-01), Santangelo
patent: 3982877 (1976-09-01), Wyeth et al.
patent: 4336009 (1982-06-01), Wolf
patent: 4489018 (1984-12-01), Ball
Czaja Donald
Gebr. Happich GmbH
Tentoni Leo B.
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