Experimental and numerical infrared heating of thermoplastic sheet during thermoforming process

Abstract : Thermoforming includes a heating stage of thermoplastic sheets by infrared lamps. The temperature distribution on the surface and through the thickness of the sheet conditions the distribution thicknesses of the thermoformed part. Our objective is to understand the heat transfers between the infrared heaters and the thermoplastic sheets. For that we developed an infrared heating device which makes it possible to carry out temperature measurements of a sheet during the heating with an infrared oven. An AGEMA 880 LW infrared camera allows measuring the back surface (non-directly exposed to the radiation) temperature distribution of the sheet. An indication of temperature discrepancy through the thickness is given by a RAYTEK Thermalert TX pyrometer. Two infrared ovens (halogen and ceramics lamps) were studied characteristics of infrared ranges (short and long wavelengths respectively) on a polymer representative of the thermoforming market (white PS 3mm-thickness sheets). These experimental measurements allow validating the numerical models. A method of radiative transfer based on ray tracing is used to calculate the irradiance with lamp reflectors. The Rosseland approximation is used to take into account the optical properties of the polymers that were measured using infrared spectrometry. The transient heat balance equation (including 3D radiative diffusion) is solved.
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Sylvia Andrieu, Fabrice Schmidt, Yannick Le Maoult. Experimental and numerical infrared heating of thermoplastic sheet during thermoforming process. Polymer Processing Society 20th anniversary celebration, Jun 2004, Akron (Ohio), United States. 9 p. ⟨hal-01796841⟩

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