Pressure drop estimation for polyamide 6 flow through spinnerets and filters

Gustin, A; Zupancic, A; Mitsoulis, E

dc.contributor.author	Gustin, A	en
dc.contributor.author	Zupancic, A	en
dc.contributor.author	Mitsoulis, E	en
dc.date.accessioned	2014-03-01T01:24:53Z
dc.date.available	2014-03-01T01:24:53Z
dc.date.issued	2006	en
dc.identifier.issn	0021-8995	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17489
dc.subject	Extrusion	en
dc.subject	Polyamides	en
dc.subject	Polycondensation	en
dc.subject	Viscoelastic properties	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Extrusion	en
dc.subject.other	Polyamides	en
dc.subject.other	Polycondensation	en
dc.subject.other	Rheology	en
dc.subject.other	Sintering	en
dc.subject.other	Viscoelasticity	en
dc.subject.other	Spinnerets	en
dc.subject.other	Viscoelastic properties	en
dc.subject.other	Weave filters	en
dc.subject.other	Pressure drop	en
dc.subject.other	computer simulation	en
dc.subject.other	filter	en
dc.subject.other	mathematical model	en
dc.subject.other	rheology	en
dc.subject.other	sensor	en
dc.subject.other	synthetic polyamide	en
dc.subject.other	viscoelasticity	en
dc.title	Pressure drop estimation for polyamide 6 flow through spinnerets and filters	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/app.23308	en
heal.identifier.secondary	http://dx.doi.org/10.1002/app.23308	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	The pressure drop resulting from polyamide 6 flow through industrial spinnerets and wire-mesh filters was examined as a possible parameter for improving spinning process constancy with experimental techniques and a numerical approach. The rheological characterization of the polymer melt was performed with a capillary rheometer and a controlled-stress rotational rheometer equipped with a high-temperature oven cell. Measurements in a nitrogen atmosphere were carried out at different temperatures and at various moisture contents to determine the effect of the postcondensation process on the rheological properties of the polymer melt. These experiments were used to collect all basic material information necessary to fit the data with the purely viscous Cross model and the viscoelastic Kaye, Bernstein, Kearsley, Zappas (K-BKZ) model. A spinning pilot plant (consisting of an extruder, a gear pump, a pressure sensor, and a spin beam with several spin packs installed) was used to measure pressure drop values through industrial spinnerets and through two types of filters: (1) Dutch twilled weave filters and (2) sintered filters. Pilot plant tests on filters showed that in the examined range of melt throughputs, the pressure drop increased linearly with an increase in the melt flow rate for all the filters considered. The results with respect to the spinneret geometry led to the conclusion that the numerical simulations gave satisfactory predictions even for experimental data coming from complex systems such as spinning plants, as long as extensional properties were accounted for by the model. On the contrary, pressure drop predictions obtained from the Cross model underestimated the pilot plant values by approximately 20% because of the inability of the model to consider the extensional component of the flow. (c) 2006 Wiley, Periodicals, Inc.	en
heal.publisher	JOHN WILEY & SONS INC	en
heal.journalName	Journal of Applied Polymer Science	en
dc.identifier.doi	10.1002/app.23308	en
dc.identifier.isi	ISI:000235556400091	en
dc.identifier.volume	100	en
dc.identifier.issue	2	en
dc.identifier.spage	1577	en
dc.identifier.epage	1587	en