Method and device for the production of articles having a...

B - Operations – Transporting – 29 – D

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B29D 27/00 (1980.01)

Patent

CA 1053872

ABSTRACT OF THE DISCLOSURE: A method for the production of articles having a non- cellular smooth skin and a cellular core from polymer materials which contain blowing agents, by injection molding. The method of the invention comprises heating the polymer material to a temperature lower than the decomposition temperature of the blowing agent as the polymer material flows through an injection nozzle and into a mold cavity to form a non-cellular skin, abruptly increasing the temperature of the flowing polymer melt to above the decomposition temperature of the blowing agent to cause the polymer to foam and to form a cellular core and thereafter reducing the temperature of the flowing polymer melt to below the decomposition temperature of the blowing agent to complete the non-cellular skin in the area of the injection nozzle.

201463

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