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

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

B - Operations, Transporting

29

D

18/660

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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