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Étude mécanique et physico-chimique du contact rouleau - papier lors du calandrage

Abstract : Calendering consists of running a sheet of paper at high pressure and speed (contact time less than 1 ms) between at least two heated rolls so as to improve the paper surface quality. However, this operation reduces paper thickness. Our study focused on the mechanical behaviour of paper in the nip and on the surface interactions between the paper and the rolls. Different grades of printing and writing paper were studied (coated, un-coated).Two spherical indentation tests on paper samples were developed (falling ball and quasi-static compression) and calendering trials were performed. The contact time in the falling ball test is equivalent to that in calendering. The mechanical interpretation of these tests and trials allows us to obtain stress / strain curves and the evolution of " static " elastic modulus with the permanent deformation. The mechanical variables are influenced by the paper formulation, conditioning and time of solicitation. Using the quasi-static compression test, a model permits to evaluate the nip width in static conditions.The adhesion between the paper surface and the rolls is studied with a rolling friction test and calendering trials. Calendering trials enable to link the improvement of paper surface properties (gloss, smoothness) to the thickness reduction and to specify how the roll surface roughness is transferred onto the paper.
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Submitted on : Tuesday, February 10, 2009 - 9:58:00 AM
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  • HAL Id : tel-00359998, version 1

Citation

Eric Tourette. Étude mécanique et physico-chimique du contact rouleau - papier lors du calandrage. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2007. Français. ⟨NNT : 2007ENMP1510⟩. ⟨tel-00359998⟩

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