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Fibers 2018, 6(4), 81;

Effect of Density and Fiber Size on Porosity and Thermal Conductivity of Fiberboard Mats

Centre de Recherche sur les Matériaux Renouvelables (CRMR), Université Laval, 2425 rue de la Terrasse, Québec, QC G1V 0A6, Canada
Direction de la Modernisation de L’industrie des Produits Forestiers, Ministère des Forêts, de la Faune et des Parcs, 5700, 4e avenue Ouest, bureau A-202, Québec, QC G1H 6R1, Canada
Author to whom correspondence should be addressed.
Received: 31 August 2018 / Revised: 11 October 2018 / Accepted: 14 October 2018 / Published: 19 October 2018
(This article belongs to the Special Issue Natural Fibre Biocomposites)
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The thermal conductivity and porosity of fiberboard mats are crucial parameters for efficient energy consumption of the hot-pressing process and for final panel quality. In this work, the effect of fiber size and mat density on porosity and thermal conductivity of the mat were investigated. The fiber size was characterized as fine, medium and coarse. The mat porosity was measured by image analysis using the black and white contrast method. The thermal conductivity was determined at different density levels with a temperature gradient of 1.6 °C mm−1 and 7.6% (s = 0.3) moisture content. The results showed that fiber size was a dominant variable governing heat conduction and mat porosity. The mats made with medium size fibers showed a higher resistance to compression. The thermal conductivity of coarse fiber mats decreased drastically between 700 kg m−3 and 810 kg m−3. This was likely due to a higher fracture frequency observed for coarse fibers in comparison to the other fiber sizes studied. Hence, the fine and medium fibers conducted heat more efficiently. Moreover, fiber bundles and fractured fibers were observed during the mat porosity measurements, principally in mats made with fine fiber size. View Full-Text
Keywords: mat porosity; mat thermal conductivity; fiber size; density; hot-pressing process mat porosity; mat thermal conductivity; fiber size; density; hot-pressing process

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Rebolledo, P.; Cloutier, A.; Yemele, M.-C. Effect of Density and Fiber Size on Porosity and Thermal Conductivity of Fiberboard Mats. Fibers 2018, 6, 81.

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