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The Polymer Film Casting Process – An Overview

Y. Demay and J. F. Agassant

Abstract

Cast film extrusion allows producing technical polymer films for packaging and coating applications. Different kinds of defects may be observed. For packaging applications, the challenge is to obtain very thin films in stable conditions at the highest throughput. For coating applications, the challenge is to master the film width reduction (called neck-in) and the induced non-uniform film thickness (called dog-bone defect). Well instrumented experiments point out the influence of the polymer and of the processing conditions on the occurrence of these defects. Numerical models of increasing complexity allow capturing the main experimental features and this makes possible to propose technological solutions to delay or even to suppress defects occurrence.


Jean-François Agassant, MINES Paristech, PSL Research University, CEMEF, UMR CNRS 7635, Sophia-Antipolis, 06560 Valbonne, France

Acknowledgements

The authors want to acknowledge the colleagues, PhD and master students who have been involved for thirty years in this deep investigation of the Polymer Cast Film Process: Ph. Barq, R. Bouamra, S. D’Halewyn, J. M. Haudin, A. Kallel, D. Silagy and C. Sollogoub.

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Received: 2020-11-04
Accepted: 2020-12-23
Published Online: 2021-07-07
Published in Print: 2021-07-27

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