The effect of die materials and pressure-dependent slip on the extrusion of linear low-density polyethylene
作者:
Timothy J. Person,
Morton M. Denn,
期刊:
Journal of Rheology
(AIP Available online 1997)
卷期:
Volume 41,
issue 2
页码: 249-265
ISSN:0148-6055
年代: 1997
DOI:10.1122/1.550877
出版商: The Society of Rheology
关键词: Slip;Sharkskin;Materials of construction, effect on flow;Pressure, effect on slip;POLYETHYLENES;SHEAR PROPERTIES;PRESSURE DEPENDENCE;X-RAY SPECTROSCOPY;PHOTOELECTRON SPECTROSCOPY;STAINLESS STEELS;RHEOLOGY
数据来源: AIP
摘要:
The flow of linear low-density polyethylene through stainless-steel slit dies occurred at shear rates approximately 12% higher than in identical α-brass dies at the same wall shear stresses, indicating near-wall slip. The flow curves were independent of gap spacing. We show through the slip theory of Hill and co-workers [J. Rheol.34, 891–918 (1990)] that a measurable gap dependence of the flow curve is not a necessary consequence of wall slip; the flow curves for both stainless steel and α-brass dies can be fit with the same rheological parameters, with a difference in the work of adhesion accounting for the differences in the flow curves. X-ray photoelectron spectroscopy revealed differences in the chemistry of brass surfaces with different pretreating, corresponding to small differences in flow curves. Fluorocarbon-coated die surfaces showed no more slip than stainless steel, while the flow curve with gold-coated surfaces followed stainless steel at intermediate stress and brass at high stress.
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