B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 45/00 (2006.01) B29C 45/17 (2006.01) B29C 45/77 (2006.01)
Patent
CA 2125623
ABSTRACT OF THE DISCLOSURE A method of injection molding of an article having a closed internal hollow space includes injecting a plastic melt into a mold cavity of an injection mold having an initial volume, maintaining the plastic melt in the mold cavity under a dwell pressure for a predetermined period of time, thereafter, injecting a fluid pressure medium into the plastic melt in the mold cavity, and, after the injection of the fluid pressure medium was started, either increasing the initial volume of the mold cavity, if it was less than a volume of the molded article, to a volume corresponding to the article volume, or discharging a predetermined amount of the plastic melt from the mold cavity if the initial volume of the mold cavity corresponded to the volume of the molded article. An injection mold for effecting the foregoing method is also described.
Eckardt Helmut
Ehritt Jurgen
Battenfeld Gmbh
Fetherstonhaugh & Co.
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