Electronic Resource
s.l. ; Stafa-Zurich, Switzerland
Advances in science and technology
Vol. 45 (Oct. 2006), p. 436-441
ISSN:
1662-0356
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Natural Sciences in General
,
Technology
Notes:
A mathematical model has been derived to describe the pressure drop along theconveying and reverse sections of a partly full, fully intermeshing co-rotating twin-screw extruder.The model extends previous work on single screw extrusion, whereby the Benbow-Bridgwatermodel of paste rheology is combined with a force balance on a plug of paste.Experiments to verify the model have been carried out using a laboratory scale twin-screwextruder fitted with a hydraulic feeder and a modified barrel section allowing the collection ofpressure data at numerous points along the extruder. Initial results suggested that the model wasable to correctly predict the trends observed but underestimated the absolute values of the pressure.This was attributed to a change in the rheology of the paste due to viscous heating effects. Furtherexperimental work was carried out to determine the relationship between the rheological parametersand temperature; this allowed a temperature correction to be made to the initial data after which theagreement with the predictions was greatly improved
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.436.pdf
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