Valorisation des boues papetières et du peuplier hybride dans la fabrication de panneaux de fibres de moyenne densité (MDF)
|Advisor:||Koubaa, Ahmed; Riedl, Bernard|
|Abstract:||The wood composites industry has more and more difficulties to find raw materials. The aim of this project is to show that hybrid poplar and paper mill sludge are both sustainable fiber ressources. Thirty medium-density fiberboard panels (MDF) were produced with 12% of ureaformaldehyde resin and various ratios of hybrid poplar fibers and primary paper mill sludge from kraft and thermomechanical processes. According to the ASTM D-1037 standard method, the evaluated properties were modulus of elasticity, modulus of rupture, internal bond strength, thickness swell and linear expansion. Panel density and formaldehyde emission were also measured. The results show that MDF made from hybrid poplar fully satisfies the industrial quality requirements. Panels with 25% of kraft or thermomechanical sludge meet the ANSI A208.2-2002 MDF standard for the highest grade. Overall, kraft sludge give inferior performances than thermomechanical sludge, probably due to their high ash content. For the lowest grade of ANSI A208.2-2002 MDF standard, it is possible to increase the amount of thermomechanical sludge to 75%. Sludge plays a significant role in MDF panel properties, particularly for internal bond strength, linear expansion and formaldehyde emission. In the future, research efforts should demonstrate that formaldehyde-free composites are compatible with paper mill sludge.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||18 April 2018|
|Collection:||Thèses et mémoires|
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