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Transient Swell of a High Density Polyethylene Using Adjustable Gap Slit Die

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Published/Copyright: November 29, 2017
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Abstract

A novel slit die with an adjustable gap is designed to perform transient swell measurements while changing the die gap dynamically. A generalized control model is developed to predict time-dependent swell using characteristic relaxation time and corresponding steady state swell as model parameters. Further, a series of slit dies are designed and used to measure steady state thickness swell of a high-molecular-weight blow-molding grade high density polyethylene resin under various operating and geometrical conditions. A generalized expression for steady state thickness swell is obtained by applying multi-variable nonlinear regression on thus obtained steady state thickness swell data, and is used in the empirical control model to predict transient extrudate swell.


*Correspondence address, Mail address: Savvas G. Hatzikiriakos, Department of Chemical and Biological Engineering, The University of British Columbia, Vancouver, BC, 2360 East Mall V6T1Z3, Canada, E-mail:

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Received: 2017-01-22
Accepted: 2017-02-20
Published Online: 2017-11-29
Published in Print: 2017-11-17

© 2017, Carl Hanser Verlag, Munich

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