Adjustable mold gate

Details Adjustable mold gate Adjustable mold gate

B - Operations, Transporting

29

C

B29C 45/28 (2006.01) B29C 45/27 (2006.01) B29C 45/30 (2006.01)

Patent

CA 2183718

A mold gate and a method of using the same, in which the mold gate has an adjustable-area and width, annular access opening to each mold cavity. As the area is adjusted, the flow of molten plastic to the cavity is controlled for the injection molding of plastic parts. The adjustment may be made by rotating an outer rotary bushing relative to an inner stationary bushing, which is surrounded by the outer rotary bushing in one embodiment, and which projects beyond it in another. The position of a hot probe is thus controlled to vary the area of the access opening. Cooling lines in the vicinity of the hot probe may be provided for significant improvement of operation. Also, a method is disclosed in which the gate operates without closure by means of metal parts. Rather, the frozen molding compound itself serves to close the gate between mold shots.

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