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In-line measurement of residence time distribution in twin-screw extruder using non-destructive ultrasound  

Lee, Sang-Myung (Applied Rheology Center, Dept. of Chemical Engineering, Sogang University)
Park, Jong-Cheol (Applied Rheology Center, Dept. of Chemical Engineering, Sogang University)
Lee, Sang-Mook (Applied Rheology Center, Dept. of Chemical Engineering, Sogang University)
Ahn, Young-Joon (Applied Rheology Center, Dept. of Chemical Engineering, Sogang University)
Lee, Jae-Wook (Applied Rheology Center, Dept. of Chemical Engineering, Sogang University)
Publication Information
Korea-Australia Rheology Journal / v.17, no.2, 2005 , pp. 87-95 More about this Journal
Abstract
In this study, we performed RTD measurement at the die exit of co-rotating twin-screw extruder using a non-destructive ultrasonic device. The ultrasonic device was attached at slit die and was composed of a steel buffer rod and 10 MHz longitudinal piezoelectric ultrasonic transducer. This in-line ultrasonic monitoring method is based on the ultrasonic response of $CaCO_3$ filled in polymer. The RTD is evaluated by variation of ultrasonic attenuation with time caused by change of the tracer concentration during extrusion. The ultrasonic tracer, pellet type of compounded $CaCO_3$ in polymer was used in this study. The effects of tracer concentration on RTD and flow patterns were studied. Evaluation for the residence functions at different screw speeds, feeding rates and screw configurations were also carried out.
Keywords
RTD; ultrasound; extruder; tracer; calcium carbonate;
Citations & Related Records

Times Cited By Web Of Science : 6  (Related Records In Web of Science)
Times Cited By SCOPUS : 6
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