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The Mechanism of Neck-in Phenomenon in Film Casting Process

Published/Copyright: April 29, 2014
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Abstract

In this study, the non-isothermal viscoelastic simulation of the film casting process was carried out. Low-density polyethylene polymerized by a high-pressure process (LDPE) was used for the simulation. The LDPE exhibited strain hardening in elongational viscosity since it has long chain branching. The Phan-Thien/Tanner model, as a constitutive equation of the viscoelastic fluid, and temperature dependence of the Arrhenius law were employed for the simulation to investigate the effect of viscoelasticity on extrusion drawing, so-called neck-in phenomenon. We developed the theoretical model on the basis of deformation type and force balance of a film to recognize the mechanism of the neck-in phenomenon. It was confirmed from a combination of the simulation results and the theoretical model that neck-in was determined by the ratio of planar to uniaxial elongational viscosity rather than the strain hardening nature of a uniaxial elongational viscosity.


* Correspondence address Mail address: Seiji Shiromoto, Sumitomo Chemical Co. Ltd., 2-1 Kitasode, Sodegaura-city, Chiba 299-0295, Japan E-mail:

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Received: 2013-03-12
Accepted: 2013-09-11
Published Online: 2014-04-29
Published in Print: 2014-04-29

© 2014, Carl Hanser Verlag, Munich

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