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Article

Direct Joule Heating as a Means to Efficiently and Homogeneously Heat Thermoplastic Prepregs

Institut für Kunststofftechnik, University of Stuttgart, Pfaffenwaldring 32, 70569 Stuttgart, Germany
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Polymers 2020, 12(12), 2959; https://doi.org/10.3390/polym12122959
Received: 13 November 2020 / Revised: 7 December 2020 / Accepted: 8 December 2020 / Published: 11 December 2020
Although direct Joule heating is a known technique for heating carbon fiber reinforced plastics, it is a yet unexplored heating method for thermoplastic prepregs before back-injection molding. The knowledge obtained from resistance welding, for example, is not directly transferable because of considerably higher heated volumes and more complex shapes. In this study, the governing parameters and process limits are established for this method. The influences of the contacting, the materials used, and the size of the heated part are investigated with respect to the part temperature and heating efficiency. The findings show that the quality of heating is determined by the shape and size of the electrodes. Larger electrodes lead to a more homogeneous temperature distribution. Parts based on woven fabric can be heated more homogeneously because of the existence of intersections between rovings, generating contact between fibers. An increase in part width results in uneven heating behavior. View Full-Text
Keywords: thermoplastic-based composite; injection molding; process monitoring; electrical properties thermoplastic-based composite; injection molding; process monitoring; electrical properties
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MDPI and ACS Style

Wellekötter, J.; Bonten, C. Direct Joule Heating as a Means to Efficiently and Homogeneously Heat Thermoplastic Prepregs. Polymers 2020, 12, 2959. https://doi.org/10.3390/polym12122959

AMA Style

Wellekötter J, Bonten C. Direct Joule Heating as a Means to Efficiently and Homogeneously Heat Thermoplastic Prepregs. Polymers. 2020; 12(12):2959. https://doi.org/10.3390/polym12122959

Chicago/Turabian Style

Wellekötter, Jochen; Bonten, Christian. 2020. "Direct Joule Heating as a Means to Efficiently and Homogeneously Heat Thermoplastic Prepregs" Polymers 12, no. 12: 2959. https://doi.org/10.3390/polym12122959

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