Tube extrusion of polymeric materials: Optimization of the processing parameters

Mamalis, AG; Vortselas, AK; Kouzilos, G

dc.contributor.author	Mamalis, AG	en
dc.contributor.author	Vortselas, AK	en
dc.contributor.author	Kouzilos, G	en
dc.date.accessioned	2014-03-01T02:14:51Z
dc.date.available	2014-03-01T02:14:51Z
dc.date.issued	2012	en
dc.identifier.issn	00218995	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/30156
dc.subject	computer modeling	en
dc.subject	extrusion	en
dc.subject	polyethylene (PE)	en
dc.subject.other	Computer modeling	en
dc.subject.other	Die wall	en
dc.subject.other	Flow speed	en
dc.subject.other	Inhomogeneities	en
dc.subject.other	Inlet pressures	en
dc.subject.other	Inlet temperature	en
dc.subject.other	Multiparametric optimization	en
dc.subject.other	Non-linear optimization	en
dc.subject.other	Processing condition	en
dc.subject.other	Processing parameters	en
dc.subject.other	Product quality	en
dc.subject.other	Shape distortions	en
dc.subject.other	Weld lines	en
dc.subject.other	Extrusion	en
dc.subject.other	Optimization	en
dc.subject.other	Polyethylenes	en
dc.subject.other	Polymers	en
dc.subject.other	Thermoplastics	en
dc.subject.other	Tubes (components)	en
dc.subject.other	Dies	en
dc.title	Tube extrusion of polymeric materials: Optimization of the processing parameters	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/app.36555	en
heal.identifier.secondary	http://dx.doi.org/10.1002/app.36555	en
heal.publicationDate	2012	en
heal.abstract	In the study described in this article, we aimed to apply multiparametric optimization to the processing conditions in a spider die used for the extrusion of polymers, in this case, high-density polyethylene tubes. Product quality is affected by the homogeneity of the flow speed and the temperature at the die exit. Inhomogeneity causes shape distortions and material weak spots (weld lines), and its major cause in spider dies is the discontinuity and distortion of the flow caused by spider legs, the ties by which the inner mandrel of the die is secured to its external casing. The Nelder-Mead nonlinear optimization technique was applied to the numerical model to pinpoint the processing conditions, namely, the inlet pressure, inlet temperature of the melt, temperature of the die walls, and temperature of the spider legs. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 Copyright © 2012 Wiley Periodicals, Inc.	en
heal.journalName	Journal of Applied Polymer Science	en
dc.identifier.doi	10.1002/app.36555	en
dc.identifier.volume	126	en
dc.identifier.issue	1	en
dc.identifier.spage	186	en
dc.identifier.epage	193	en