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Licensed Unlicensed Requires Authentication Published by De Gruyter March 11, 2015

Improving Film Die Flow Uniformity Using Optimization Methods Coupled with Finite Element Computational Fluid Dynamics (CFD) Analysis

  • P. C. Lee , L. Dietsche , J. Dooley and S. Parashar


The aim of this study was to evaluate various optimization strategies to be used with computational fluid dynamics (CFD), in order to optimize the geometry for a polymer die to meet the dual objectives of uniform flow at the exit with minimal pressure drop. 3D finite element simulations using the numerically optimized geometry predict a more uniform flow than simulations using the baseline geometry. However, some of the initial optimized results yielded die geometries that would be impractical to fabricate. Additional constraints were placed on the allowable geometric parameters and solution space to push the optimization towards more feasible optimal solutions. Thus we have shown how CFD-based optimization methods, coupled with knowledge of die design technology and fabrication techniques can lead to the design of better performing polymer dies.

* Mail address: Patrick C. Lee, School of Engineering, University of Vermont, 33 Colchester Avenue, Burlington, VT, 05405, USA. E-mail:


Chung, C. I., Lohkamp, D. T., “Designing Coat-hanger Dies by Power-law Approximation”, Modern Plastics, March (1976)Search in Google Scholar

Crochet, M. J., Davies, A. R. and Walters, K.: Numerical Simulation of Non-Newtonian Flow, Elsevier, New York (1984)Search in Google Scholar

Lebaal, N., Schmidt, F., Puissant, S. and Schlafli, D., “Design of Optimal Extrusion Die for a Range of Different Materials”, Polym. Eng. Sci., 49, 432440 (2009)10.1002/pen.21298Search in Google Scholar

Lee, P. C., Dietsche, L., Dooley, J. and Metwally, H., “Improving Flow Uniformity from a Film Die by Geometry Modification Using a Three Dimensional Finite Element Optimization Technique”, SPE ANTEC Tech. Papers, 57, 12591266 (2011)Search in Google Scholar

Matsubara, Y., “Geometry Design of a Coat-hanger Die with Uniform Flow Rate and Residence Time across the Die Width”, Polym. Eng. Sci., 19, 169172 (1979) 10.1002/pen.760190302Search in Google Scholar

Metwally, H., Lee, P. C., “Optimization and Sensitivity Analysis of a Film Die,” SPE ANTEC Tech. Papers, 70, 11451149 (2012)Search in Google Scholar

Michaeli, W., Kaul, S., “Approach of an Automatic Extrusion Die Optimization,” J. Polym. Eng., 24, 123136 (2004)Search in Google Scholar

Rigoni, E., Turco, A., “Metamodels for Fast Multi-Objective Optimization: Trading Off Global Exploration and Local Exploitation“, Proceeding of the 8th International Conference on Simulated Evolution and Learning, Springer-Verlag, Berlin, Heidelberg, p. 523532 (2010) 10.1007/978-3-642-17298-4_56Search in Google Scholar

Smith, D. E., Tortorelliav, D. A. and Tucker, C. L., “Optimal Design for Polymer Extrusion. Part I: Sensitivity Analysis for Nonlinear Steady-State Systems”, Comput. Methods Appl. Mech. Eng., 167, 283302 (1998)10.1016/S0045-7825(98)00129-7Search in Google Scholar

Smith, D. E., Tortorelliav, D. A. and Tucker, C. L., “Optimal Design for Polymer Extrusion. Part II: Sensitivity Analysis for Weakly-Coupled Nonlinear Steady-State Systems”, Comput. Methods Appl. Mech. Eng., 167, 303323 (1998b)10.1016/S0045-7825(98)00130-3Search in Google Scholar

Sun, Y., Gupta, M., “Effect of Elongational Viscosity on the Flow in a Flat Die”, Int. Polym. Proc., 20, 380387 (2005) 10.3139/217.2016Search in Google Scholar

Winter, H. E., Fritz, H. G., “Design of Dies for the Extrusion of Sheets and Annular Parisons: The Distribution Problem”, Polym. Eng. Sci.26, 543553 (1986) 10.1002/pen.760260805Search in Google Scholar

Received: 2013-11-04
Accepted: 2014-08-29
Published Online: 2015-03-11
Published in Print: 2015-03-02

© 2015, Carl Hanser Verlag, Munich

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