Stabilized core injection molding

Details Stabilized core injection molding Stabilized core injection molding

B - Operations, Transporting

29

C

18/682

B29C 45/16 (2006.01) B29C 45/36 (2006.01) B29C 45/56 (2006.01)

Patent

CA 1234466

ABSTRACT A method for controlling the dimentions of a hollow plastics pro- duct, injection molded within the cooling cavity of a mold having, a core part and a cavity part defining the cooling cavity therebe- tween, and injection gate means opening into the cooling cavity, the method comprising stabilizing the core part, and being characterized by the steps of: (a) injecting first plastics material through said injection gate means into the cooling cavity so that the cavity is not filled; (b) using the first plastics material to stabilize the core part by impeding movement of the core part; (c) retracting a retractable portion of one of the said parts to provide a flow path for second plastics material between the in- jection gate means and the unfilled portion of the cooling cavity; (d) injecting second plastics material through the injection gate means to the unfilled portion of the cooling cavity by passage through said flow path.

432256

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