Valve gated injection molding system with independant flow control

摘要

An injection molding system includes a manifold (102) and a valve gated hot runner nozzle (104). The gating mechanism includes an actuated valve pin (110), where the mold gate orifice (108) is open when the valve pin (110) is in a first position to allow melt to flow there through. The mold gate orifice (108) is closed when the valve pin (110) is in a second position to prevent melt from flowing there though. A flow control pin (114) is disposed within the melt stream, either coaxially with the valve pin (110) within the melt channel (107) of the nozzle (104) or within the manifold melt channel (106). The flow control pin (114) has a head with a complementary geometry with that of the melt channel at a flow control surface (116). The flow control pin (114) is raised and lowered by an actuation mechanism (117) to constrict or release the flow of the melt stream independent from the movement of the valve pin (110). <IMAGE>