Universite de Toulouse, INPT 1 article published in JoVE Engineering Twin-Screw Extrusion Process to Produce Renewable Fiberboards Philippe Evon1, Laurent Labonne1, Saif Ullah Khan1,2,3, Pierre Ouagne3, Pierre-Yves Pontalier1, Antoine Rouilly1 1Laboratoire de Chimie Agro-industrielle (LCA), Université de Toulouse, INRAE, INPT, 2Balochistan University of Information Technology, Engineering and Management Sciences, 3Laboratoire Génie de Production (LGP), Université de Toulouse, INPT A versatile twin-screw extrusion process to provide an efficient thermo-mechano-chemical pretreatment on lignocellulosic biomass was developed, which leads to an increased average fiber aspect ratio. A natural binder can also be added continuously after fiber refining, leading to bio-based fiberboards with improved mechanical properties after hot pressing of the obtained extruded material.