Analysis of Polymer Flow in a Stepped Parallel Bore Coating Unit by Power Law

摘要

Polymer flow for a continuum coating in a stepped parallel bore pressure unit was simulated where the flow is dependent on the wire velocity,geometry of the unit,and the properties of the polymer melt.In a hydrodynamic wire coating process the pulling action of the solid continuum through a circular cross-section stepped parallel or conical orifice filled with polymer melt generates hydrodynamic pressure as well as polymer coating on the continuum.In this paper a mathematical model was developed for the pressure distribution within a stepped parallel bore pressure unit.Results were also obtained for different wire speeds in terms of the changes in viscosity,shear rate,shear stress,and drawing force within the unit.Theoretical hydrodynamic pressure and drawing force results have been compared with the experimental results from literature.