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Poncsák, Sándor; Kocaefe, Duygu; Bouazara, Mohamed; Pichette, Andre
Wood science and technology, 12/2006, Letnik: 40, Številka: 8Journal Article
The thermal treatment of wood is an alternative to the chemical treatment for preservation purposes. The heat treatment process improves wood's resistance to decay and its dimensional stability. However, mechanical strength decreases as a result of heat treatment. Therefore, the treatment parameters have to be optimized to keep this loss at a minimum while improving other properties. Thermal treatment is new in North America, and its parameters are not yet adjusted for the Canadian species. Carrying out the parameter adjustment in an industrial furnace requires many trials which are costly in terms of material and man-power. A laboratory study was carried out to determine the effect of different parameters of the heat treatment on the mechanical properties of birch in order to optimize this process. A thermogravimetric analyzer was built to carry out the laboratory tests. The impact of the process parameters-such as maximum treatment temperature, holding time at this temperature, heating rate, and gas humidity-on the mechanical properties of birch was investigated. Temperature distributions in wood and in gas as well as the weight loss of wood were measured during the experiments. Afterwards, hardness, modulus of elasticity, modulus of rupture, and resistance to screw withdrawal of the samples were measured. The relation between the process parameters and the resulting mechanical properties was examined.
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