Sprue bushing and nozzle for injection moulding.

摘要

A bushing used in an injection moulding machine and positioned between the nozzle and the sprue thereof includes an adaptor body (17) having a longitudinal axis, a first end (12) and a second end (14). A first bore (22) extends in the adapted body parallel to the longitudinal axis from the second end to the first end for accommodating a flow of relatively viscous fluid such as a molten thermoplastic. A bridge (30) extends transversely across the first bore (22) between opposing walls of the bore adjacent the adaptor body first end (12). Fluid flow is allowed through the first bore around the bridge. A second bore (38) extends from a surface of the adaptor body to a surface of the bridge for accommodating a flow of a relatively non-viscous fluid such as gas. The second bore (38) terminates on the bridge surface so as to be substantially coaxial with the first bore (22). The arrangement can permit better fitting and gas discharge characteristics.