Measuring the pressure dependent viscosity at high shear rates using a new rheological injection mould

W. Friesenbichler; I. Duretek; J. Rajganesh; S. R. Kumar

Published : 2011-01-30

Vol. 56 No. 1 (2011)

Measuring the pressure dependent viscosity at high shear rates using a new rheological injection mould

W. Friesenbichler I. Duretek J. Rajganesh S. R. Kumar

Abstract

To shorten the development time for injection moulded parts, process simulations in different developing steps as well as quick and accurate measurements of rheological data even for the increasing variety of special compounds are necessary. For simulation of thin wall injection moulding accurate viscosity data measured at shear rates up to 800.000 s-1 and more are important, but not available in any commercial material database. Therefore, within the EU project "Pro4Plast", an easy-to-handle rheological measurement system was developed by the Institute of Polymer Processing, Montanuniversitaet Leoben, Austria. The rheological mould is constructed like a standard injection mould with interchangeable dies. It can be mounted onto any conventional inection moulding machine and enables operators (manufacturers, especially SMEs) to measure viscosity in time on their own machines at practically relevant shear rates (from 100 s-1 to 2 · 10[sup]6 s-1). A special feature allows measuring the pressure dependency of viscosity using closed-loop counter pressure control. Experimental data are evaluated taking into account the melt temperature rise due to dissipative heating.

Keywords

reologia ; lepkość ; zależność od ciśnienia ; duża szybkość ścinania ; ciepło rozpraszane rheology ; viscosity ; pressure dependency ; high shear rate ; dissipative heating

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Friesenbichler, W., Duretek, I., Rajganesh, J., & Kumar, S. R. (2011). Measuring the pressure dependent viscosity at high shear rates using a new rheological injection mould. Polimery, 56(1), 58–62. Retrieved from https://ichp.vot.pl/index.php/p/article/view/892

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Remove 1. Knappe W., Krumböck E.: Rheol. Ada 1986, 25, 296.

2. Bader C, Diez M., Kaiser W.: Kunststoffe 1991, 81, No 3, 220.

3. Amano O., Ainoya K.: „Pressure dependent viscosity of polymer melts”, ANTEC 2000, 504.

4. Kelly A. L., Gongh T., Whiteside B. R., Coates P. D.: J. Appl. Polym. Sci. 2009, 114, 864.

5. Takahashi H., Matsuoka T., Kurauchi T.: J. Appl. Polym. Sci. 1985, 30, 4669.

6. Helleloid G. T.: Morehead Electronic J. Applic. Mathematics 2001, Nr 1, 1.

7. Friesenbichler W., Langecker G. R., Duretek L, Schuschnigg S.: „Polymer melt rheology at high shear rates using a New micro-rheology technique”, Proceedings of the 21th Annual Conference of the Polymer Processing Society, Leipzig, Germany 2005.

8. Agassant J. F., Avenas P., Sergent J. P., Carreau P. J.: „Polymer processing: principles & model ling”, Carl Hanser Verlag, Munich - Vienna - New York 1991.

9. Ramesh Kumar S.: „Rheological characterisation of polimer melts on an injection moulding machine using a new slit die measurement system”, Master thesis, Montanuniversitaet Leoben, 2008.

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W. Friesenbichler polimery@ichp.pl

I. Duretek

J. Rajganesh

S. R. Kumar