Analysis of influent parameters during infrared radiative heating of PET preform

Abstract : The processing parameters during radiative heating of PET preform are: The number of infrared heaters N h , The temperature T i of each infrared heater L i=1, N h The heating time t h , The cooling time t c , The coordinate vector x i=1,N h of each infrared heater L i=1, N h ,  The heat transfer coefficient h c between cooling air and PET preform. In previous papers [1,2], the spectral emissivity and directivity of different halogen lamps (Philips 300-700W electric nominal power made of a coiled tungsten filament, contained in a quartz tubular enclosure and a diffuse reflector made of a ceramic coating) have been reported. Recent measurements using a 0.6-25 m thermopile sensor on similar halogen lamps of 1000W (used in an industrial oven of injection-blow moulding machine) have been processed. The maximum temperature of the tungsten filament is 2400 K. As shown in fig. 1, these infrared heaters exhibit a slightly different behaviour from a lambertian source (diffuse radiation) due to the reflector. The average discrepancy is about 8 %. In order to take into account the participation of the diffuse reflector in the amount of the incident radiation, a coefficient of efficacy k rf is introduced. Fig. 2 shows the experimental setup that has been developed in order to measure the surface temperature distribution (front face and back face), when a PET sheet is heating using previous infrared heaters. An 880 LW AGEMA infrared camera (8-12 m bandwidth) is used to measure the spatial and transient temperature distribution. The surface dimension of the PET sheet is 20cm  20cm cm and the thickness is 1.5 mm. A 3D control-volume model has been developed for computing radiative heat transfer during the infrared heating stage. The sheet-shape domain sketched in fig. 3 is discretised into cubic elements, called control-volumes [3]. The energy equation including radiative transfer integrated over each control volume V e  x y z and over the time from t to t  t leads to:
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Fabrice Schmidt, Serge Monteix, Yannick Le Maoult, Gérard Denis. Analysis of influent parameters during infrared radiative heating of PET preform. International Conference of Polymer Processing Society, Jun 2000, Shangaï, China. ⟨hal-02056287⟩

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