Simulation of the two stages stretch-blow molding process: Infrared heating and blowing modeling

Abstract : In the Stretch-Blow Molding (SBM) process, the temperature distribution of the reheated perform affects drastically the blowing kinematic, the bottle thickness distribution, as well as the orientation induced by stretching. Consequently, mechanical and optical properties of the final bottle are closely related to heating conditions. In order to predict the 3D temperature distribution of a rotating preform, numerical software using control-volume method has been developed. Since PET behaves like a semi-transparent medium, the radiative flux absorption was computed using Beer Lambert law. In a second step, 2D axi-symmetric simulations of the SBM have been developed using the finite element package ABAQUS((R)). Temperature profiles through the preform wall thickness and along its length were computed and applied as initial condition. Air pressure inside the preform was not considered as an input variable, but was automatically computed using a thermodynamic model. The heat transfer coefficient applied between the mold and the polymer was also measured. Finally, the G'sell law was used for modeling PET behavior. For both heating and blowing stage simulations, a good agreement has been observed with experimental measurements. This work is part of the European project ``APT_PACK'' (Advanced knowledge of Polymer deformation for Tomorrow's PACKaging).
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Maxime Bordival, Fabrice Schmidt, Yannick Le Maoult, Vincent Velay. Simulation of the two stages stretch-blow molding process: Infrared heating and blowing modeling. NUMIFORM 2007 - 9th International conference on numerical methods in industrial forming processes, Jun 2007, Porto, Portugal. pp.519+. ⟨hal-01703248⟩

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