G - Physics – 01 – K
Patent
G - Physics
01
K
G01K 7/16 (2006.01) B29C 45/27 (2006.01) G05D 23/24 (2006.01) H05B 3/02 (2006.01)
Patent
CA 2436171
A temperature sensor (10) for use In hot runner systems Includes a resistive element (20) which is connectable via contacting means (30) to a control circuit for a heating device (40) and which includes at least one element portion (24) of larger electrical resistance than its remaining portions, preferably larger by a factor of 2 to 100. The resistive element portions (22, 24) 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 (22, 24) may consist of different materials. In connection with a heating device (40), the temperature sensor is located on or in the body (K) of a manifold or a nozzle, with meandering and/or bifilar heating conductors (44) whose electrical resistance In the middle (B) is smaller than in the top (O) and bottom (E) regions. The temperature sensor portion (24) is tightly enclosed in a zone (48) of high resistance by adjacent heating conductors (44). A dielectric layer (58) may be undetachably fixed to the manifold or nozzle body (K) and after firing, be under compressive pretension relative to the body (K).
Fetherstonhaugh & Co.
Guenther Gmbh & Co. Metallverarbeitung
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