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Evolution of lignocellulosic fibre lengths along the screw profile during twin screw compounding with polycaprolactone
Affiliation:1. Université de Reims Champagne-Ardenne, UMR614 Fractionnement des AgroRessources et Environnement, F-51100 Reims, France;2. INRA, UMR614 Fractionnement des AgroRessources et Environnement, F-51686 Reims, France;3. MINES ParisTech, Centre de Mise en Forme des Matériaux (CEMEF), CS 10207, F-06904 Sophia Antipolis, France;1. Institut de Génie Biomédical, Department of Physiology, Faculty of Medicine, Université de Montréal, CP 6128, Succ Centre-Ville, Montréal H3C 3J7, Canada;2. Centre de Recherche, Hôpital du Sacré-Coeur de Montréal, Canada;1. Institute of Parasitology, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 266a, 8057 Zurich, Switzerland;2. Section of Epidemiology, Vetsuisse Faculty, University of Zurich, Winterthurerstrasse 270, 8057 Zurich, Switzerland;1. Université de Bretagne-Sud, IRDL, CNRS UMR 6027, BP 92116, 56321 Lorient Cedex, France;2. Van Robaeys Frères, 83 Rue Saint-Michel, 59122 Killem, France;3. Biopolymères Intéractions Assemblages (BIA), INRAE, Rue de la Géraudière, F-44316 Nantes, France;4. Soleil Synchrotron, Swing Beamline, Gif-sur-Yvette, France;1. Department of Chemical Engineering Materials Environment, Sapienza-Università di Roma, Roma, Italy;2. Elettra Sincrotrone Trieste, Area Science Park, Trieste, Italy;3. The Biological Materials Group, Department of Biomimetics, HSB – City University of Applied Sciences, Bremen, Germany
Abstract:Composites made of polycaprolactone reinforced by 20% hemp fibres were prepared by melt blending in a twin screw extruder (TSE). The influence of the extrusion parameters (feed rate and screw speed) on the fibre length evolution along the screw profile was investigated. The fibre length rapidly decreased after the introduction of the fibres and during the flow through the kneading blocks. Fibre fragmentation was increased at high screw speeds and low feed rates. The flow conditions along the TSE were calculated using Ludovic© software, focusing on the specific mechanical energy (SME) provided to the fibres. The fibre length evolution can be correctly estimated for various flow conditions using an exponential function of the SME.
Keywords:A  Fibres  B  Fragmentation  C  Computational modelling  E  Extrusion
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