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1 International Journal of Applied Mechanics and Engineering

1 2003

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Modelling and simulation of biaxial stretching of PVC-films

Zgardzinski K., Oelschlägel F., Schnabel R.

International Journal of Applied Mechanics and Engineering

2003

Vol. 8, no spec.

325-331

The present work attempts to investigate the behaviour of PVC-U films in a simultaneous biaxial stretching process. The numerical simulations of the biaxial stretching were performed using a finite element method for Newtonian and viscoelastic fluids with POLYFLOW-CFD program (FLUENT Inc.). For the rheological modelling of the PVC-U melts, in this problem will be used the different viscoelastic model, where the modes obey the Phan-Thien-Tanner (PTT) constitutive equation. Measurements of density, viscosity and modules and were used to determine the parameters in the model. Simulation results were compared with practicable findings on a laboratory system. We simplified the equations by the assumption obtained the film thickness and mean value of stress and velocity components in the thickness direction as variables. The effect of biaxial extension under various conditions (temperature and deformation rate) on the morphology and mechanical properties of stretched films is investigated.