scholarly journals Studies on single-screw extrusion of wood-polymer composites with yield stress and slip effects

2020 ◽  
Author(s):  
K. Wilczyński ◽  
K. Buziak ◽  
A. Lewandowski ◽  
K. J. Wilczyński ◽  
A. Nastaj
Keyword(s):  
Polymer Composites ◽  
Yield Stress ◽  
Single Screw ◽  
Single Screw Extrusion ◽  
Wood Polymer ◽  
Slip Effects ◽  
Screw Extrusion ◽  
Wood Polymer Composites

Modeling of starve-fed single screw extrusion of wood-polymer composites

Polimery ◽  
2018 ◽  
Vol 63 (7/8) ◽  
pp. 542-548 ◽  
Author(s):  
Krzysztof J. Wilczynski ◽  
Andrzej Nastaj ◽  
Kamila Buziak
Keyword(s):  
Polymer Composites ◽  
Single Screw ◽  
Single Screw Extrusion ◽  
Wood Polymer ◽  
Screw Extrusion ◽  
Wood Polymer Composites

scholarly journals Rheological Basics for Modeling of Extrusion Process of Wood Polymer Composites

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 622
Author(s):  
Krzysztof Wilczyński ◽  
Kamila Buziak ◽  
Adrian Lewandowski ◽  
Andrzej Nastaj ◽  
Krzysztof J. Wilczyński
Keyword(s):  
Polymer Composites ◽  
Process Modeling ◽  
Slip Flow ◽  
Extrusion Process ◽  
Process Conditions ◽  
Rheological Models ◽  
Wood Polymer ◽  
Slip Effects ◽  
Process Simulations ◽  
Wood Polymer Composites

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.

Water Absorption of Wood-Polymer Composites Based on PVC with Partial Replacement of Wood Filler by Mineral One

2019 ◽  
Vol 770 (5) ◽  
pp. 62-66
Author(s):  
A.A. ASKADSKII ◽  
◽  
T.A. MATSEEVICH ◽  
V.I. KONDRASHCHENKO ◽  
◽  
...  
Keyword(s):  
Water Absorption ◽  
Polymer Composites ◽  
Partial Replacement ◽  
Wood Polymer ◽  
Wood Polymer Composites

scholarly journals Dielectric Properties of Wood-Polymer Composites: Effects of Frequency, Fiber Nature, Proportion, and Chemical Composition

2021 ◽  
Vol 5 (6) ◽  
pp. 141
Author(s):  
Imen Elloumi ◽  
Ahmed Koubaa ◽  
Wassim Kharrat ◽  
Chedly Bradai ◽  
Ahmed Elloumi
Keyword(s):  
Dielectric Properties ◽  
Polymer Composites ◽  
Wide Frequency Range ◽  
Dielectric Constants ◽  
Cellulose Content ◽  
Wood Fibers ◽  
Low Frequencies ◽  
Wood Polymer ◽  
Wood Polymer Composites ◽  
New Applications

The characterization of the dielectric properties of wood–polymer composites (WPCs) is essential to understand their interaction with electromagnetic fields and evaluate their potential use for new applications. Thus, dielectric spectroscopy monitored the evolution of the dielectric properties of WPCs over a wide frequency range of 1 MHz to 1 GHz. WPCs were prepared using mixtures of different proportions (40%, 50%, and 60%) of wood and bark fibers from various species, high-density polyethylene, and maleated polyethylene (3%) by a two-step process, extrusion and compression molding. Results indicated that wood fibers modify the resistivity of polyethylene at low frequencies but have no effect at microwave frequencies. Increasing the fiber content increases the composites’ dielectric properties. The fibers’ cellulose content explains the variation in the dielectric properties of composites reinforced with fibers from different wood species. Indeed, composites with high cellulose content show higher dielectric constants.

scholarly journals Analysis of Creep of Wood-Polymer Composites

2021 ◽  
Vol 1079 (4) ◽  
pp. 042022
Author(s):  
M A Elesin ◽  
N A Mashkin ◽  
V F Khritankov ◽  
N V Karmanovskaya
Keyword(s):  
Polymer Composites ◽  
Wood Polymer ◽  
Wood Polymer Composites

Analysis of wood polymer composites by two-stage pyrolysis–GC/MS

2008 ◽  
Vol 83 (2) ◽  
pp. 213-219 ◽  
Author(s):  
Clemens Schwarzinger ◽  
Manuela Leidl ◽  
Robert Putz
Keyword(s):  
Polymer Composites ◽  
Two Stage ◽  
Wood Polymer ◽  
Wood Polymer Composites
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