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Rudloff J.,SKZ Suddeutsches Kunststoff Zentrum | Bastian M.,SKZ Suddeutsches Kunststoff Zentrum | Heidemeyer P.,SKZ | Kretschmer K.,SKZ
Kunststoffe International | Year: 2011

New modeling approaches have been developed by the German Institute for Food Technologies for planetary roller extruders (PRE) which describes conveying characteristic, temperature, power consumption, and dwell time distribution. A geometric analogous model was developed as a basis for modeling. Each individual step was modeled separately and coupled together in SimPla, an additional application for Excel table calculation software. To validate the model, investigations in the form of experiments were performed by varying the parameters, throughput, speed of rotation, cylinder temperature, and spindle number. During the experiments, pressure, temperature, torque and power consumptions were recorded. The models thus developed enable the description of process behavior in planetary roller extruder for systems without a change in state.


Schwalme G.,SKZ Suddeutsches Kunststoff Zentrum | Bastian M.,SKZ Suddeutsches Kunststoff Zentrum | Heidemeyer P.,SKZ Suddeutsches Kunststoff Zentrum | Koch M.,TU Ilmenau
Annual Technical Conference - ANTEC, Conference Proceedings | Year: 2011

In injection molding, the precise control of the mold temperature distribution is a crucial prerequisite for the quality of the final products. A new approach to achieve an excellent repeat accuracy of the mold temperature is to use infrared images of demolded parts to realize a closed loop control. Without the necessity for changes in the mold the automatic control can help to improve the quality, to keep cycle times short and to avoid scrap.

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