B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/646
B29C 44/04 (2006.01) B29C 44/34 (2006.01) B29C 45/16 (2006.01) B29C 45/56 (2006.01)
Patent
CA 1170415
ABSTRACT OF THE DISCLOSURE A method and apparatus is provided for making a composite structural solid foam resinous article having (a) a smooth, shiny non-cellular or solid relatively thin injection compression molded liner on the outer surface and (b) a cellular relatively thicker injection molded core integral with the molded liner. The method and apparatus consists of at least one extruder connected by valve controlled passages to a pair of injection devices, each device having an injection chamber. One chamber stores the solid plastic resin and the other chamber stroes the foam plastic resin or material. A first mold assembly having a transferrable upper mold part and a stationary lower mold part form a cavity at a first molding station. The cavity is in communication with the first injection chamber. A second mold assembly having a second cavity is provided at the second molding station and is formed by the aforementioned upper mold part of the first mold assembly and with another stationary lower mold part at the second station. The second cavity is in communication with the second injection chamber. Controls are provided for insuring the correct amount of each resin to be extruded and stored in the injection chambers. Fluid opera- ted means are provided for energizing the first injection device to inject the solid plastics material therein into the first mold cavity. This is followed automatically by rapidly applying a compressive force to the first mold assembly to compression mold the relatively thin injection compression molded liner. Thereafter the upper mold part of the first mold assembly, with the molded liner retained therein, is transferred to the second molding station and immediately the stored foam resinous material is injected into the second mold cavity to form with the solid liner the com- posite solid-foam plastic article having an integral relatively thin, smooth, shiny and solid molded outer surface.
404617
Frayne & Company Robert
Kmmco Structural Foam Inc.
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