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Flow induced birefringence study of vortices in LDPE polymer melt extrusion

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dc.title Flow induced birefringence study of vortices in LDPE polymer melt extrusion en
dc.contributor.author Zatloukal, Martin
dc.contributor.author Musil, Jan
dc.contributor.author Gough, Tim
dc.contributor.author Martyn, Mike T.
dc.relation.ispartof Annual Technical Conference - ANTEC, Conference Proceedings
dc.date.issued 2019
utb.relation.volume 2019-March
dc.event.title 77th Annual Technical Conference of the Society of Plastics Engineers, ANTEC 2019
dc.event.location Detroit
utb.event.state-en United States
utb.event.state-cs Spojené státy americké
dc.event.sdate 2019-03-18
dc.event.edate 2019-03-21
dc.type conferenceObject
dc.language.iso en
dc.publisher Society of Plastics Engineers
dc.description.abstract During polymer melts extrusion wide range of unstable phenomena (die drool, slip-stick, wall slip, melt fracture etc.) can occur. These instabilities significantly limit production rate and decrease final product quality. Due to significant viscoelastic nature of polymer melts, secondary flows (vortices) inside the processing tools can also occur. In these vortices, polymer melt slowly rotates which significantly extends residence time at high processing temperature. This can lead to unwanted thermal degradation. Contrary to majority of flow instabilities visually detected on extrudate surface, vortices are always hidden inside processing tools. Thus, the study of them can only be done through visualization cells and special experimental techniques mapping velocity fields (particle tracking or laser-Doppler velocimetry) or stress fields (flow induced birefringence). Despite vortices are stress induced instability, theirs study is commonly performed through velocity fields only, which is however not fundamentally correct. This work is focused on development of novel method for study of vortices in polymer melt extrusion based on flow induced birefringence. Testing of the proposed method has been done for LDPE Lupolen 1840H polymer melt. Vortex boundary obtained from stress field have been directly compared with velocity one visualized through rotating gel particle tracking. Effect of temperature and shear rate on vortex area have also been studied and successfully correlated with laser-Doppler velocity data available in open literature for the same polymer melt and similar processing conditions. © 2019 Society of Plastics Engineers. All rights reserved. en
utb.faculty Faculty of Technology
dc.identifier.uri http://hdl.handle.net/10563/1009220
utb.identifier.obdid 43880620
utb.identifier.scopus 2-s2.0-85072986661
utb.identifier.coden ACPED
utb.source d-scopus
dc.date.accessioned 2019-11-20T10:30:30Z
dc.date.available 2019-11-20T10:30:30Z
utb.contributor.internalauthor Zatloukal, Martin
utb.contributor.internalauthor Musil, Jan
utb.fulltext.sponsorship The authors wish to acknowledge Grant Agency of the Czech Republic (Grant registration No. 16-05886S) for the financial support. J.M. thanks Steve Brook, Ian Smith and Roy Dixon from University of Bradford for technical support during the experiments.
utb.scopus.affiliation Polymer Centre, Faculty of Technology, Tomas Bata University in Zlin, Vavreckova 275, Zlin, 760 01, Czech Republic; IRC in Polymer Engineering, School of Engineering, Design and Technology, University of Bradford, Bradford, BD7 1DP, United Kingdom
utb.fulltext.projects 16-05886S
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