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Contribution à l'étude de l'extrusion couchage du polypropylene sur l'aluminium

Abstract : In packaging industry, many structures are produced by extrusion coating. This study is focused on the extrusion coating of multilayered structure polypropylene / grafted polypropylene (tie layer) onto an aluminium foil. In these structure, adhesion is strong dependent on the process parameter such as temperature and speed line. During the process, a chemical reaction occurs between the polymeric grafted chains and the aluminium oxides. Indeed, polypropylene used as a tie layer was grafted in order to increase its affinity with a polar surface such as an aluminium foil. Our purpose is to study how process parameters can promote adhesion in grafted polypropylene/aluminium laminates. We investigate the complex interplay between adhesion, the formation of bonds at the interface and the mechanical properties of the polymer film. The density of bonds created at the interface is quantified by X-Ray Spectroscopy measurements after removing the polymer film from the aluminium surface by dissolution in hot xylene. DMA and tensile tests are performed to characterize the mechanical properties of polymer films. A numerical model of extrusion coating has been used to quantify the impact of cooling on adhesion. A good correlation has been found between the thermal history, the formation of bonds and the mechanical properties of the polymer films. It appears that high temperature conditions can improve adhesion by increasing the open time for the reaction and the rate of the chemical reaction between grafted polymer chains and aluminium.
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Submitted on : Thursday, September 3, 2009 - 9:48:53 AM
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  • HAL Id : tel-00413038, version 1

Citation

Samuel Devisme. Contribution à l'étude de l'extrusion couchage du polypropylene sur l'aluminium. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2006. Français. ⟨tel-00413038⟩

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