Moderation of entrance pressure drop and extrudate swelling of wood fiber/polypropylene composites melt in rotating-die extrusion process

Conference proceedings article

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Publication Details

Author list: Lntawong N., Kantala C., Lotaisong W., Sombatsompop N.

Publisher: Trans Tech Publications

Publication year: 2009

Volume number: 79-82

Start page: 1491

End page: 1494

Number of pages: 4

ISBN: 0878493042; 9780878493043

ISSN: 1022-6680

eISSN: 1662-8985

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-74049147849&doi=10.4028%2fwww.scientific.net%2fAMR.79-82.1491&partnerID=40&md5=598642b1b181bd2e6572abc7b362be38

Languages: English-Great Britain (EN-GB)

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Abstract

A novel rotating-die system was proposed to moderate the elastic swelling for molten polypropylene (PP) and wood/polypropylene (WPP) composite. The results suggested that the neat PP and WPP melts followed the psuedoplastic non-Newtonian pattern. The rotation of the die could moderate the extrusion load and entrance pressure drop. The die rotation effect appeared to be very pronounced for the PP with high wood contents and high extrusion rates. The decreases in extrusion load and entrance pressure drop were related with reductions of melt viscosity due to shear heating effect. The results practically implied that use of the rotating die system could increase the productivity in the extrusion process. In terms of elastic swelling, in all cases, it was found that the swelling ratio of neat PP and WPP melt composite increased with increasing shear rate, but for any given shear rates, the addition of wood particles and the use of rotating die caused decreases in swell ratio of the melts, the wood content being more welldefined than the die rotating speed.

Keywords

Rheometer