Method of injection molding multi-ply products using plastic hea

Details Method of injection molding multi-ply products using plastic hea Method of injection molding multi-ply products using plastic hea

1993-08-03

1995-02-14

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

264255, 2643288, 26432814, 26432815, B29C 4516, B29C 4517

Patent

active

053893310

ABSTRACT:
A method of injection molding multi-ply products includes the step of forming an insulating barrier layer from one of different plastic materials used to injection mold multi-ply products, between an injection cavity mold and each of hot-runner nozzles, prior to the injection mold. The insulating barrier layer is formed by pre-charging one of the plastic materials which is the best thermostability into a recess formed in the hot-runner nozzle at its surface contacted by the injection cavity mold, the recess communicating with the exit port of the hot-runner nozzle. The plastic material charged in the recess is cooled and solidified by the injection cavity mold. The insulating barrier layer formed by the solidified plastic material is less thermally deteriorated by heat from a hot-runner mold for a prolonged time period. The heat-insulating property of the insulating barrier layer can be assured during a continuous injection molding process over a week.

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