Melting Quality of Polymer in Internal Mixer Diagnosed by Ultrasound

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DOIResolve DOI: http://doi.org/10.3139/217.2166
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TypeArticle
Journal titleInternational Polymer Processing
Volume2009
Issue05
Pages375383; # of pages: 8
AbstractReal-time, non-intrusive and non-destructive ultrasonic technology has been used to monitor the melting process in an internal mixer. Visual observation, mechanical torque measurement, and ultrasonic signatures, such as amplitude and time delay of transmission and reflection echoes were used for the diagnosis of the melting process of low density polyethylene (LDPE). Phenomena during the melting process, including phase change from solid to melt, partially melted pellets, air bubbles inside the melt, were successfully monitored by ultrasound. The ultrasonic signatures were able to determine when the polymer has melted completely. The method of moving standard deviation (MSD) was applied to establish the melting completion timing accurately. Higher temperature of mixing chamber and faster rotation speed of blades reduced melting completion period, indicated by MSD of ultrasonic signatures. The presented ultrasonic technique can be utilized to optimize the melting process.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number50471
NPARC number15160437
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Record identifier2a0b76f0-9c17-4afc-adba-7800e70b7eac
Record created2010-05-07
Record modified2016-05-09
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