B - Operations – Transporting – 29 – D
Patent
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
Nenov Dragan I.
Nikolov Ivan D.
Popov Nikolay T.
Semerdjiev Stefan G.
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