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Étude de l'extrusion monovis de mélanges d'élastomères : approche expérimentale et simulation numérique

Abstract : The understanding and the modeling of the physics phenomena involved during the single screw extrusion process of rubber is the aim of this research work. After the formulation of a white rubber compound, different rheological experiments have been performed. Addition of zinc stearate was done on the same compound, in order to increase the slipping effect. We showed that the volume rheology remained unchanged and we suggested different slipping laws, using the classical methods found in the literature. A systematic experimental study was carried out, first of all on an industrial extruder (5 screws, representative of the one used in production), then on a laboratory extruder (simple and modular profiles). Information was obtained through experimental parameters, such as pressure, flow rate, temperature and filling rate. Then, thanks to the experimental results and their interpretation, we were able to compare the performance of different geometries and compounds. Morover, we were able to extrapolate the results from a laboratory to an industrial scale. The one dimensional approach shown the importance of side effects, related to the very pseudoplastic nature of the material. In consequence, the 1D model cannot be used. Then, we moved to a two dimensional FEM method, including different coupling, that was validated step by step. The experimental comparison showed a disagreement between experimental and simulation results. The comparison between a true three dimensional computation and a coupling 2D computation revealed a bigger difference with the decrease of the pseudoplastic coefficient. Like for the 1D approach, the 2D coupled (longitudinal/transversal) approach produced errors for rubber product, due to the very low pseudoplastic coefficient. The future seems to be moving towards a 3D approach. We presented a feasibility study of the flow along screw parts. Comparison with experiment was satisfactory.
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Submitted on : Thursday, December 31, 2009 - 2:12:50 PM
Last modification on : Thursday, September 24, 2020 - 5:22:54 PM
Long-term archiving on: : Thursday, June 17, 2010 - 10:13:38 PM

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  • HAL Id : tel-00443625, version 1

Citation

Matthieu Koscher. Étude de l'extrusion monovis de mélanges d'élastomères : approche expérimentale et simulation numérique. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2003. Français. ⟨NNT : 2003ENMP1109⟩. ⟨tel-00443625⟩

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