Tubing extrusion of a fluoropolymer melt

Mitsoulis, E; Hatzikiriakos, SG

dc.contributor.author	Mitsoulis, E	en
dc.contributor.author	Hatzikiriakos, SG	en
dc.date.accessioned	2014-03-01T02:14:52Z
dc.date.available	2014-03-01T02:14:52Z
dc.date.issued	2012	en
dc.identifier.issn	0930777X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30157
dc.subject.other	Flow behaviours	en
dc.subject.other	Flow curves	en
dc.subject.other	Fluoropolymer	en
dc.subject.other	Slip model	en
dc.subject.other	Viscoelastic effects	en
dc.subject.other	Viscous models	en
dc.subject.other	Coatings	en
dc.subject.other	Fluorine containing polymers	en
dc.subject.other	Pressure effects	en
dc.subject.other	Tubing	en
dc.subject.other	Extrusion	en
dc.title	Tubing extrusion of a fluoropolymer melt	en
heal.type	journalArticle	en
heal.identifier.primary	10.3139/217.2534	en
heal.identifier.secondary	http://dx.doi.org/10.3139/217.2534	en
heal.publicationDate	2012	en
heal.abstract	The tubing extrusion-forming process of a fluoropolymer (FEP) melt was studied both experimentally and numerically. The flow behaviour of a FEP resin was determined by using a tubular die used in industrial-scale operations and these data were compared with simulation results using (i) a viscous model (Cross) and (ii) a viscoelastic one (the Kaye - Bernstein, Kearsley, Zapas / Papanastasiou, Scriven, Macosko or K-BKZ/PSM model) in order to assess the viscoelastic effects. In all simulations, compressibility, thermal and pressure effects on viscosity were taken into account. It was found that the viscoelastic results for the pressure, and hence the stresses at the wall, were always higher than the viscous results. Both were higher than the experimental results. A quadratic slip model plus viscoelasticity was found necessary to reproduce the experiments. The smooth flow curves resulting from this industrial tubular-coating die are a further manifestation that this is an appropriate design for coating fluoropolymers at very high apparent shear rates, exceeding 5 000 s-1. © Carl Hanser Verlag GmbH & Co. KG.	en
heal.journalName	International Polymer Processing	en
dc.identifier.doi	10.3139/217.2534	en
dc.identifier.volume	27	en
dc.identifier.issue	2	en
dc.identifier.spage	259	en
dc.identifier.epage	269	en