Rheological Basics for Modeling of Extrusion Process of Wood Polymer Composites

Polymers

KrzysztofJ. Wilczyński¹  Kamila Buziak²  Andrzej Nastaj²  Krzysztof Wilczyński²  Adrian Lewandowski² 

[1] Politech Ltd., 86-031 Osielsko, Poland;Polymer Processing Department, Faculty of Production Engineering, Warsaw University of Technology, 85 Narbutta, 02-524 Warsaw, Poland;

关键词: wood polymer composites;    screw extrusion;    modeling;   

DOI  :  10.3390/polym13040622

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown