Hot runner, in particular a hot runner for an injection moulding machine or plastic injection mould

摘要

A first sleeve (17) is electrically insulated from an outer flange (30) whose inward facing end faces a flange (21) around a second sleeve (18) and is soldered to the end face of this flange. At least one melt flow channel runs close to the soldered surfaces and has walls in the flange area made completely of metal. Preferred Features: Radial bridging pieces at the end of the first sleeve (17) facing the flange (21) around the second sleeve (18) make electrical connection between the first sleeve and a distribution ring connected to an electrical connection (25). Openings between the bridges enable the walls of the melt flow channel in the outer flange (30) to project through and connect with flow channels in the flange around the second sleeve. An end cap surrounds the free ends (13,16) of the heating bar and first sleeve and connects them electrically. In a variation of this arrangement the melt flow channels may be separate inserts which fit into openings between the bridging pieces and are electrically insulated from the adjacent surfaces. Alternatively, the flange around the second sleeve is integrated with the latter and has one or more melt flow openings parallel to the nozzle axis whose walls extend completely through the flange and are made entirely of metal. Ribs between the flow openings have channels for electrically insulated adjustable screws forming current bridges between the first sleeve and a current distributor.