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Article dans une revue

Cast film problem: A non isothermal investigation

Abstract : An important problem arising in the cast film process is the socalled neck-in phenomenon, which may induce a drastic film width reduction as well as an inhomogeneous film thickness distribution (with the so called "dog-bone" defect on each side of the film). This neck-in phenomenon is highly influenced by the polymer rheology (increasing polymer elasticity leads to decrease markedly the neck-in), the stretching distance, the cooling conditions and the draw ratio. In this paper, we present a 2D Newtonian non-isothermal model based on a membrane approximation for the film. Stress balance, mass balance and temperature balance equations are solved iteratively using various finite element methods adapted to free surface problems and to transport equations. Coupling between mechanical and thermal equations is achieved introducing an Arrhenius temperature dependance for the viscosity. The influence of the heat transfer coefficient has been carefully investigated.
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Article dans une revue
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https://hal-mines-paristech.archives-ouvertes.fr/hal-00613074
Contributeur : Magalie Prudon <>
Soumis le : mardi 2 août 2011 - 15:35:35
Dernière modification le : mercredi 23 septembre 2020 - 04:25:54

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  • HAL Id : hal-00613074, version 1

Citation

Cyrille Sollogoub, Yves Demay, Jean-François Agassant. Cast film problem: A non isothermal investigation. International Polymer Processing, 2003, 18 (1), pp.Pages 80-86. ⟨hal-00613074⟩

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