Two-phase Simulation of Tubular Film Blowing of Crystalline Polymers

B. K. Ashok; G. A. Campbell

doi:10.3139/217.920240

Article

Two-phase Simulation of Tubular Film Blowing of Crystalline Polymers

B. K. Ashok and G. A. Campbell

Published/Copyright: May 27, 2013

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From the journal International Polymer Processing Volume 7 Issue 3

Abstract

Traditionally, modeling of the film blowing process consisted mainly of balances of the forces on a single layer of thin film and a mathematically defined freeze-line. In this publication we develop an alternative approach for the theoretical analysis for film blowing of crystalline polymer melts by treating the film as two layers, crystallized and amorphous. Therefore, a two-phase constitutive model is presented for the process simulation of the tubular film blowing of crystalline polymer melts. An upper convected Maxwell equation of state with a single relaxation time and the Oldroyd derivative is applied to the amorphous or liquid-like phase while a perfect plastic-elastic model with yield is used to describe the deformations of the crystallized phase. The model interpretations and predictions are obtained and found to be in qualitative agreement with published results. For polyethylene the model appears to help explain the interactions of the processing conditions and fluid-mechanics in the film blowing process of crystalline polymers.

* Mail address: Prof. Dr. G. A. Campbell, Polymer Fabrication and Processing Laboratory, Department of Chemical Engineering, Clarkson University, Potsdam, NY 13699-5709, U.S.A.

Received: 1991-9-7

Accepted: 1992-1-21

Published Online: 2013-05-27

Published in Print: 1992-09-01

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https://doi.org/10.3139/217.920240