چکیده مقاله
Remarkable functional characteristics and low material costs of polypropylene PP foams have rendered them as a promising substitute for other thermoplastic foams in industrial applications This paper investigates the effect of nucleating agent talc on expansion behaviours of non crosslinked high melt strength HMS polypropylene PP foamed using supercritical carbon dioxide CO2 A charge coupling device CCD camera was installed at the die exit to carefully monitor the shape of the extruded polypropylene foam The expansion behaviour of HMS PP was observed and visualized by using varying amounts of talc Different die geometries which are related to die pressure and pressure drop rate and varying amounts of CO2 is also used in experiments Experimental results indicated that talc content did not play an important role to enhance the expansion ratio of the foamed sample Results also indicated that the expansion ratios of PP foams exhibited mountain shaped curves This demonstrated the existence of an optimum temperature range for maximum expansion However, the typical mountain shaped expansion curves were not observed for some cases
کلیدواژهها
نویسندگان
T Azdast
Assistant Professor ۱Corresponding Author Address: Manufacturing Engineering Group, Mechanical Engineering Department, Faculty of Engineering, Urmia University, Urmia, Iran
C.B. Park
Full Professor of Department of Mechanical and Industrial Engineering, University of Toronto, Canada
A.H Behravesh
Associate Professor of Mechanical Engineering Department, Tarbiat Modares University, Tehran, Iran
E. K Lee
PhD Student of Department of Materials Science and Engineering, University of Toronto, Toronto, Canada
شیوه ارجاع
Azdast, T and Park, C.B. and Behravesh, A.H and Lee, E. K,1387,Visualization of Talc Amount Effect on Expansion Behaviour of HMS PP Extruded Foam,9th Iranian Conference on Manufacturing Engineering,Birjand
ارائهشده در
مجموعه مقالات نهمین کنفرانس مهندسی ساخت و تولید13 اسفند 1387 · بیرجند