Rheological Basics for Modeling of Extrusion Process of Wood Polymer Composites
1
Polymer Processing Department, Faculty of Production Engineering, Warsaw University of Technology, 85 Narbutta, 02-524 Warsaw, Poland
2
Politech Ltd., 86-031 Osielsko, Poland
*
Author to whom correspondence should be addressed.
Academic Editor: Salim Hiziroglu
Polymers 2021, 13(4), 622; https://doi.org/10.3390/polym13040622
Received: 3 February 2021
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Revised: 13 February 2021
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Accepted: 17 February 2021
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Published: 19 February 2021
(This article belongs to the Special Issue Advances in Screw Processing of Polymeric Materials - In Memory of Professor James Lindsay White)
Wood polymer composites are materials with pseudoplastic and viscoelastic properties. They have yield stress and exhibit slip during flow. Studies on extrusion and rheology, as well as on process modeling of these highly filled materials are limited. Extensive rheological and extrusion modeling studies on the wood polymer composite based on the polypropylene matrix were performed. Viscous and slip flow properties were determined (with Rabinowitsch, Bagley, and Mooney corrections) at broad (extrusion) range of shear rate and temperature, using a high-pressure capillary rheometer. Rheological models of Klein and power-law were used for flow modeling, and Navier model was applied for slip modeling. A novel global computer model of WPC extrusion with slip effects has been developed, and process simulations were performed to compute the extrusion parameters (throughput, power consumption, pressure, temperature, etc.), and to study the effect of the material rheological characteristics on the process flow. Simulations were validated experimentally, and were discussed with respect to both rheological and process modeling aspects. It was concluded that the location of the operating point of extrusion process, which defines the thermo-mechanical process conditions, is fundamentally dependent on the rheological materials characteristics, including slip effects.
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Keywords:
wood polymer composites; screw extrusion; modeling
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MDPI and ACS Style
Wilczyński, K.; Buziak, K.; Lewandowski, A.; Nastaj, A.; Wilczyński, K.J. Rheological Basics for Modeling of Extrusion Process of Wood Polymer Composites. Polymers 2021, 13, 622. https://doi.org/10.3390/polym13040622
AMA Style
Wilczyński K, Buziak K, Lewandowski A, Nastaj A, Wilczyński KJ. Rheological Basics for Modeling of Extrusion Process of Wood Polymer Composites. Polymers. 2021; 13(4):622. https://doi.org/10.3390/polym13040622
Chicago/Turabian StyleWilczyński, Krzysztof, Kamila Buziak, Adrian Lewandowski, Andrzej Nastaj, and Krzysztof J. Wilczyński. 2021. "Rheological Basics for Modeling of Extrusion Process of Wood Polymer Composites" Polymers 13, no. 4: 622. https://doi.org/10.3390/polym13040622
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