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Injection Moulding of Electrically Conductive Thermoplastics - Process Technology and Model Building

Highly filled and electrically conductive plastics are interesting for the use in fuel cell systems, especially for the application bipolar plate. For realising cost-effective components, it is important to choose the correct manufacturing procedure. With injection moulding it is possible to produce in an efficient way. With highly filled compounds basing on a polypropylene it was possible to mould electrically conductive moulded parts. Experimental investigations focussed the potential of optimisation regarding the electrical properties with varying process parameters.

The largest influence was identified in all cases of varying the thermal-stress situation of the compound. In this case, high thermal stress was useful for building a conductive network for the moulded part. Beside the presentation of impacts of all injection moulding process parameters, a calibratable process- and material model for injection moulding simulation was developed.

With measuring process data at defined real injection moulding processes it was possible to create an experimental processing window with two factors (mould temperature and injection speed). The calibration was carried out with two variable parameters for calculating the effective values for the viscosity and the heat transfer coefficient. By changing these parameters it was possible to include process dependent properties and furthermore the differing properties of the highly filled plastics in comparison to standard plastics. In addition it was possible to present the prognosis quality of the model by calculating the cavity pressure curve of the non-calibrated mould temperature 120 °C in a correct way.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Jens  Dörner

Jens Dörner
Lehrstuhl für Konstruktion und Kunststoffmaschinen
Universität Duisburg-Essen

Information

Free keywords: Electrical Conductivity, Injection Moulding, Fillers, Injection Moulding Simulation, Forecast Model, Carbon Nanotubes,Highly Filled Plastics, Highly Filled Thermoplastics, Optimisation of Electrical Conductivity, Bipolar Plate, PEM-Fuel-Cell
Institute / chair: Fakultät für Ingenieurwissenschaften, Abteilung Maschinenbau und Verfahrenstechnik der Universität Duisburg-Essen
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Johannes Wortberg, Prof. Dr.-Ing. Gerd Witt
Publication year: 2012
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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