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Advances in infrared technology for the online monitoring of injection moulding: application to the understanding of the nature of contact at the polymer—mould interface

Department of Electrical and Computer Engineering, Laval University, Quebec Quebec G1K 7P4, Canada, bendada{at}gel.ulaval.ca

A. Derdouri

National Research Council Canada, 75 De Mortagne, Boucherville Quebec J4B 6Y4, Canada

Y. Simard

National Research Council Canada, 75 De Mortagne, Boucherville Quebec J4B 6Y4, Canada

M. Lamontagne

National Research Council Canada, 75 De Mortagne, Boucherville Quebec J4B 6Y4, Canada

We describe a novel online infrared method for remote sensing of the surface and the bulk temperatures of polymers during injection moulding. The method may also be applied to other polymer forming processes such as extrusion and blow moulding. The key feature of the new method is the use of a hollow optical fibre that is incorporated into the injection mould to transmit the thermal radiation from the target to the sensor. The main characteristic of the hollow optical fibre is that it exhibits low transmission loss of the thermal energy in the mid-and far-infrared, and no end reflection. This allows measurement of quite low temperatures, as low as near room temperature. Conventional optical fibre thermometers can neither measure such low temperature ranges nor measure the polymer surface temperature. In this article, we present the first online results of critical tests of the new device. A Husky injection moulding press was used for the experiments. Good correlation was found between the radiometric results and those obtained with a thermal probe inserted near the polymer—mould interface, and with infrared imaging after the polymer part was ejected from the injection mould. In the second part of the paper, we show how the new infrared device can be used to give a better insight on the time evolution of the thermal contact between polymer and mould through the different phases of a typical injection moulding cycle. The experimental results show that thermal contact between polymer and mould is not negligible and not constant with time.

Key Words: infrared waveguide • injection moulding • pyrometry • radiometry • temperature • thermal contact resistance • thermal probe.

References

• AlAluft, M., Dror, J., Katzir, A. and Croitoru, N. 1993: Infrared radiometry measurements using plastic hollow waveguides based on thin films. Journal of Physics D: Applied Physics 26, 1036—40.[CrossRef][Web of Science]
• Beck, J.V. 1986: Combined function specification-regularization procedure for solution of inverse heat conduction problem. AIAA Journal 24, 180—85.[Web of Science]
• Beck, J.V., Blackwell, B. and St. Clair, C.R. 1985: Inverse heat conduction. Wiley.
• Bendada, A. and Nguyen, K.T. 1999: Inverse heat conduction of time and space dependent temperature during material processing. 3rd International Conference on Inverse Problems in Engineering. ASME, 355—61.
• Chervin, J.C., Syfosse, G. and Besson, J.M. 1994: Optical strength of sapphire windows under pressure. Review of Scientific Instruments 65, 2719—25.[CrossRef][Web of Science]
• Cossman, P.H., Romano, V., Sporri, S., Altermatt, H.J., Croitoru, N., Frenz, M. and Weber, H.P. 1995: Plastic hollow waveguides. Lasers in Surgery and Medicine 16, 66—75.[CrossRef][Web of Science][Medline] [Order article via Infotrieve]
• Delaunay, D., Le Bot, P., Fulchiron, R., Luye, J.F. and Regnier, G. 2000: Nature of contact between polymer and mold in injection molding. Part I: Influence of a non-perfect thermal contact. Polymer Engineering and Science 40, 1682—91.[CrossRef][Web of Science]
• Gannot, I., Schrunder, S., Dror, J., Inberg, A., Ertl, T., Tschepe, J., Muller, G.J. and Croitoru, N. 1995: Flexible waveguides for Er-YAG laser radiation delivery. IEEE Transactions on Biomedical Engineering 42, 967—72.[CrossRef][Web of Science][Medline] [Order article via Infotrieve]
• Harrington, J.A. 2000: A review of IR transmitting hollow waveguides. Fiber and Integrated Optics 19, 211—27.[CrossRef][Web of Science]
• Konno, M., Cui, A., Nishiwaki, N. and Hori, S. 1993: 51st ANTEC Conference. Society of Plastics Engineers, 2798—803.
• Lai, G.Y. and Rietveld, J.X. 1996: Role of polymer transparency and temperature gradients in the quantitative measurement of process stream temperatures during injection molding via IR pyrometry. Polymer Engineering and Science 36, 1755—68.[CrossRef][Web of Science]
• Maier, C. 1996: Infrared temperature measurement of polymers. Polymer Engineering and Science 36, 1502—12.[CrossRef][Web of Science]
• Matsuura, Y. and Harrington, J.A. 1995: Infrared hollow glass waveguides fabricated by chemical vapor deposition. Optics Letters 20, 2078—80.[Medline] [Order article via Infotrieve]
• Migler, K.B. and Bur, A.J. 1997: Measuring temperature profiles during polymer processing. Plastics Engineering October, 27—29.
• Migler, K.B. and Bur, A.J. 1998: Fluorescence based measurement of temperature profiles during polymer processing. Polymer Engineering and Science 38, 213—21.[CrossRef][Web of Science]
• Nguyen, K.T. and Bendada, A. 2000: An inverse approach of the prediction of the temperature evolution during induction heating of a semi-solid billet. Modelling and Simulation in Materials Science and Engineering 8, 857—70.[CrossRef][Web of Science]
• Ozisik, M.N. 1980: Heat conduction. Wiley, New York.
• Quilliet, S., Le Bot, P., Delaunay, D. and Jarny, Y. 1997: Heat transfer at the polymer-metal interface. A method of analysis and its application to injection molding. Proceedings of the National Heat Transfer Conference 2. ASME, 9—16.
• Reinhardt, H.J. 1993: Analysis of sequential methods of solving the inverse heat conduction problem. Numerical Heat Transfer B 24, 445—74.
• Rietveld, J.X. and Lai, G.Y. 1994: Inverse method for obtaining the temperature profile within a mold cavity via IR pyrometry. Proceedings of the ANTEC Conference. Society of Plastics Engineers, 836—40.
• Saito, M. and Kikuchi, K. 1997: Infrared optical fiber sensors. Optical Review 4, 527—38.[CrossRef][Web of Science]
• Saito, M., Sato, S. and Miyagi, M. 1992: Radiation thermometry for low temperatures using an infrared hollow waveguide. Optical Engineering 31, 1793—99.[CrossRef][Web of Science]
• Shiraishi, Y., Norikane, H., Narazaki, N. and Kikutani, T. 2002: Analysis of heat flux from molten polymers to molds in injection molding processes. International Polymer Processing 2, 166—75.

Transactions of the Institute of Measurement and Control, Vol. 29, No. 5, 431-451 (2007)
DOI: 10.1177/0142331207075587


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This Article Abstract Free Full Text (Free PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Add to Saved Citations Download to citation manager Request Permissions Request Reprints Add to My Marked Citations Citing Articles Citing Articles via Web of Science (1) Citing Articles via Google Scholar Citing Articles via Scopus Google Scholar Articles by Bendada, A. Articles by Lamontagne, M. Search for Related Content Social Bookmarking                         What's this?