  Two mathematical models are derived to describe the thermal dynamics of a
plastics production machine. The Smart Sensor design is based on the finite
volume model. The accuracy of the derived finite volume model is validated by a
finite element model. Those models are validated by measurements. A Smart
Sensor for the heat flow between the extruder cylinder and screw conveyor is
designed. Such a configuration has the advantage to decouple the thermal
control problem from the specific granulate.
