Method and apparatus for injection foam molding

Details Method and apparatus for injection foam molding Method and apparatus for injection foam molding

B - Operations, Transporting

29

D

18/660

B29D 27/00 (1980.01) B29F 1/00 (1980.01)

Patent

CA 1090076

ABSTRACT A method and apparatus for the manufacture by foam molding of plastic products by first injecting into a mold solid plastic resin and then injecting a foamed plastic resin of the same basic composition as the solid plastic resin. The process and apparatus consisting of a single extruder and single injection chamber wherein the solid and foamed plastic resin are extruded and stored until shot into the mold by hydraulic pressure. Controls and provided for the correct amount of each type of resin to be extruded and stored ad the process can be adapted so that the sprue portion of the product will be solid resin and by a simple addition, coloring may be added so that the basic resin, method or apparatus will not require changes.

263301

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