B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/709
B29C 45/73 (2006.01) B29C 45/16 (2006.01)
Patent
CA 2010381
ABSTRACT OF THE DISCLOSURE Valve gated hot runner molding system or apparatus for sequentially injecting different types of fluid or plastic melt into a cavity. A valve member is reciprocated between forward closed and retracted open positions in a central bore in a heated nozzle. Separate channels convey the different types of melt from different molding machines to angularly spaced outlets to the central bore near the forward end of the nozzle. The valve member is rotated by rack and pinion mechanism between corresponding angular positions. The valve member has a longitudinal groove near the forward end which connects one of the melt channel outlets to a larger diameter bore adjacent the gate when the valve member is retracted to the open position. After the first type of material partially fills the cavity around the outside, the valve member is rotated to fill the middle of the cavity with another type of material. The different channels join adjacent where the valve member closes the gate so there is no residual material from the wrong channel after each shot.
Dalesman & Company
Mold-Masters Limited
LandOfFree
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