The effect of die materials and pressure-dependent slip on the extrusion of linear low-density polyethylene
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- Timothy J. Person
- Materials Sciences Division, Lawrence Berkeley National Laboratory
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- Morton M. Denn
- Materials Sciences Division, Lawrence Berkeley National Laboratory
抄録
<jats:p>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.</jats:p>
収録刊行物
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- Journal of Rheology
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Journal of Rheology 41 (2), 249-265, 1997-03-01
Society of Rheology
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キーワード
詳細情報 詳細情報について
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- CRID
- 1360011145636241152
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- NII論文ID
- 30016143983
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- DOI
- 10.1122/1.550877
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- ISSN
- 15208516
- 01486055
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- データソース種別
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- Crossref
- CiNii Articles