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Film casting of viscoelastic liquid
Author(s) -
Alaie Seyed M.,
Papanastasiou T. C.
Publication year - 1991
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760310203
Subject(s) - materials science , viscoelasticity , shear thinning , rheology , composite material , polypropylene , casting , shear (geology) , constitutive equation , relaxation (psychology) , thermodynamics , psychology , social psychology , physics , finite element method
Melt film‐casting is analyzed by means of a nonlinear integral constitutive equation that incorporates shear history effects, spectrum of relaxation times, shear thinning, and extension thinning or thickening. Film temperature and thickness profiles are predicted. The effects of shear‐thinning, relaxation time, and die‐design on the final film thickness are evaluated. Temperature variations are investigated by means of the pseudo ‐time concept. The process dependence on the rheological characteristics of the viscoelastic fluid, the die‐design through the history effects, the conditions at the take‐up end, and the film temperature is discussed. Predicted film and temperature profiles of casting of polypropylene are compared with experimental data taken from the literature.