Medium-density fiberboard performance as affected by wood fiber acidity, bulk density, and size distribution |
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Authors: | Cheng Xing S Y Zhang James Deng Bernard Riedl Alain Cloutier |
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Institution: | (1) Forintek Canada Corporation, 319 rue Franquet, Quebec City, QC, Canada, G1P 4R4;(2) Département des Sciences du Bois, Faculté de foresterie et de géomatique, CRB, Université Laval, Ste-Foy, Quebec, Canada, G1K 7P4;(3) Present address: Tennessee Forest Products Center, The University of Tennessee, 2506 Jacob Dr., Knoxville, TN 37996-4570, USA |
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Abstract: | The properties of medium-density fiberboard (MDF) panels as affected by wood fiber characteristics were investigated. Wood chips from three softwood and one hardwood species were refined under the same refining conditions to make four different types of fibers. The resulting fibers were characterized by fiber size distribution, bulk density, pH value, and buffering capacity. Using the same resin system and hot-pressing parameters, MDF panels were produced and evaluated for internal bonding (IB), modulus of rupture (MOR), modulus of elasticity (MOE), thickness swelling, and linear expansion. The pH values and alkaline buffering capacities of raw materials were reduced considerably after refining. IB was strongly related to the pH value of fibers. The mechanical properties increased with alkaline buffering capacity. IB, MOR, and MOE increased with the bulk density of fibers. Increased proportions of coarse fibers had negative effects on the panel mechanical properties. |
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