EXTERNALLY HEATED HOT-RUNNER NOZZLE WITH RESISTANCE WIRE

摘要

The invention relates to an externally heated hot nozzle (1), especially a hot nozzle for producing injection moulded shaped parts, comprising a resistance wire (2) which consists of an inner electrical heat conductor (3), a ceramic insulating intermediate layer (4) and an outer metal sheath (5). Said resistance wire (2) has two end areas (6) to which a heating voltage can be applied and an intermediate section (7) in the form of a heating coil which corresponds to the circumference of the hot nozzle. The resistance wire (2) is characterised in that with an external diameter of 1.5-2.5 mm, the two end areas (6) are larger than the intermediate section (7) with its external diameter of 1.0-1.8 mm.