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Authors
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Große, S.; Blankschein, U.; Stephan, M.; Stintz, M.
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Title
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Realtime Monitoring of Particles and Inhomogeneities in Flowing Polymer Melts at Extrusion and Injection Molding Processing
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Date
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19.06.2008
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Number
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427
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Abstract
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In this paper an unique optical sensor system will be presented which is able to provide realtime information about particle and inhomogeneity situation in different flowing polymer melts by an inline or online process adaptation. By applying different kinds of signal evaluation in combination with a matched optical sensor setup a broad range of particles sizes and particle concentrations can be covered. This gives the opportunity to use that sensor system for a versatile number of applications in polymer processing. Thus phase morphology in flowing polymer blend melts can be evaluated. There are also first results on estimation of the dispersion degree of (nano-)filler in a flowing polymer composite melt as result of an extrusion compounding. From continuous particle sensor measurement a highly effective process optimization can be established to achieve high and stable product performance and to minimize waste from plastics processing. For unfilled amorphous polymers (PC, PMMA) only a minimum amount of disturbing particles is tolerable for certain high performance products (e.g. optical parts like glasses or lenses, displays, optical storage media). For this reason this optical sensor system can be applied for control of melt purity by an realtime detection of unwanted single particles in terms of process control and quality assurance. The presentation will give an overview about the applied measuring method. The optical sensor system and the possible sensor configurations to fit to different<br />measuring tasks will be explained in detail as well as the possibilities and limitations of the method. Thereby the main focus is set on some of the most relevant results achieved at extrusion processing from laboratory to pilot plant to industrial scale. Furthermore first results at injection molding processes will show the potential of the method as well as further sensor developments which are necessary to meet the demands of this discontinuous polymer processing.
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Publisher
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Proceedings of the Polymer Processing Society 24th Annual Meeting
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Wikidata
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Citation
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Proceedings of the Polymer Processing Society 24th Annual Meeting (2008) 3 Pages
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DOI
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http://www.poly-eng.uakron.edu/pps/meetings.php
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