کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9693392 | 1459117 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Coating kinetics of fluoropolymer processing aids for sharkskin elimination: The role of droplet size
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The ability of fluoropolymer based polymer processing aids (PPA) to eliminate surface melt fracture (sharkskin) during extrusion of polyethylene is studied in relation to blend morphology (PPA droplet size) and processing conditions (shear rate). Under a constant throughput, the die entrance pressure, the PPA coating thickness and the degree of fracture are simultaneously monitored. The thickness of the fluoropolymer coating on the die surface is measured in situ through frustrated total internal reflection. A substantial enhancement in the coating rate and the magnitude of the steady state coating thickness as well as the faster elimination of sharkskin upon increase of PPA droplet size have been determined. These results are consistent with a recently developed model of the coating process.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Newtonian Fluid Mechanics - Volume 131, Issues 1â3, 30 November 2005, Pages 22-31
Journal: Journal of Non-Newtonian Fluid Mechanics - Volume 131, Issues 1â3, 30 November 2005, Pages 22-31
نویسندگان
D. Bigio, M.G. Meillon, S.B. Kharchenko, D. Morgan, H. Zhou, S.R. Oriani, C.W. Macosko, K.B. Migler,