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J. Tomaszewski, Z. Lasocki, W. Jarmoc, M. Niezabitowski


Thin-layer heaters in extruders and injection moulding machines


Polimery 1988, No 7-8, 288


DOI: dx.doi.org/10.14314/polimery.1988.288

Summary

The heating systems of extruders and injection moulding machines composed of heaters with a resistance heating element in the form of a thin layer of metal oxides (e.g. Sn02tSb), it means the so-called thin-layer heaters have better exploitation characteristics than the heating systems with traditional heaters. The utilization of thin-layer heating elements in specially designed constructions ensures a higher energetic efficiency, a more uniform temperature field und a better course of changes in heat stream in dependence on the temperature. The thin layers of tin oxide on dielectric support can exhibit either metallic or semiconducting characteristics, in dependence on the conditions of their preparation. This makes it possible to construct heating systems of various types. The comparative studies of the energetic characteristics of these heaters and an analysis of their design and exploiation behaviour have revealed that a thin-layer heater with metallic characteristics is better than a thin-layer heater with semiconducting characteristics and a traditional resistance heater. It has also been found that it is possible to optimize the heating power supplied to the thin-layer heater with metallic characteristics so as to obtain the lowest energy consumption per unit.



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