Abstract: A compound body comprises a steel base element on which is deposited a heater layer. The base element is made of a precipitation hardening steel. In the form of a manifold or material feed tube in a hot duct system, said base element comprises a round or convex surface receiving the heater layer. This heater layer is a compound layer having several strata and/or strata elements which are thick film pastes or sheets and in such form are consecutively deposited, dried and baked-on. The pre-compression generated in this process in the heater layer is increased in controlled manner by precipitation hardening the base element.

Abstract: A needle valve nozzle for an injection mould has a nozzle body with at least one melt channel that terminates in a nozzle mouthpiece and a fluidic connection to a mould cavity formed by a mould insert. A shut-off needle penetrates the melt channel and nozzle mouthpiece and can be displaced between open and closed positions. At least one infeed cone is provided upstream of a seal seat to centre the shut-off needle, the lower end of which forms a shut-off part. The nozzle mouthpiece consists of a material with high thermal conductivity, with the infeed cone configured in a centering body consisting of wear-resistant material and running concentrically with the longitudinal axis of the needle valve nozzle. The entering body is held against and/or in the nozzle mouthpiece in a positive-fit and its end section forming an outlet for the melt can be engaged with the mould insert.

Abstract: A temperature sensor for use in hot runner systems includes a resistive element which is connectable via contacting means to a control circuit for a heating device and which includes at least one element portion of larger electrical resistance than its remaining portions, preferably larger by a factor of 2 to 100. The resistive element portions may form U-shaped bows or loops or may be meandering. Two resistive tracks above one another are separated by insulating layers, e.g. ceramic dielectric layers. The resistive element portions may consist of different materials. In connection with a heating device, the temperature sensor is located on or in the body of a manifold or a nozzle, with meandering and/or bifilar heating conductors whose electrical resistance in the middle is smaller than in the top and bottom regions. The temperature sensor portion is tightly enclosed in a zone of high resistance by adjacent heating conductors.