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Identification and reduction of quality fluctuations through practical injection molding process control methods

To produce a steady consistent high quality is the declared goal of the injection moulding industry. For technical or economic reasons, it is not possible to ensure constant production framework conditions. The proper method is to compensate the variable influences with the choice of the correct process control method.

The first part of the thesis focuses on the analysis of the different disturbances factors. The investigation showed that the material property, melt viscosity, varies about 15% and the recrystallisation temperature arises a deviation of 4°C. Another changes could be measured in the offset of the pressure sensor (5 bar) and the process temperatures (1°C).

The next goal was to find a suitable control method to balance these intermittencies. The test series showed clearly that changes in the material properties could not be compensated. But there impact toward the quality could be extenuated with a constant course of the process parameter in the cavity.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Johannes Eben

Johannes Eben
Institut für Fördertechnik und Kunststoffe
Technische Universität Chemnitz

Information

Free keywords: injection molding, injection moulding, process capability; quality control, reproducibility, process parameters, quality control; Batch-to-batch deviations; quality, quality fluctuations, process control, waste, control, switching processes
Institute / chair: Fakultät für Maschinenbau der Technischen Universität Chemnitz
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Peter Karlinger (Betreuer), Prof. Dr.-Ing. Michael Gehde
Publication year: 2014
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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