| 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 through. A first flow control surface (114) is disposed on said valve pin (110) within the melt channel (107) of the nozzle (104). The first flow control surface (114) has a complementary geometry with that of the melt channel (107) at a second flow control surface (116). The valve pin (110) is raised and lowered to a lesser degree than that required to seat and unseat the valve pin head (111) to constrict or release the flow of a melt stream in the melt channel (107). <IMAGE> |
