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Thermal treatment of hardwood species from Italian plantations: preliminary studies on some effects on technological properties of wood

Palanti S;Pizzo B;Santoni I;
2007
2007
Istituto per la Valorizzazione del Legno e delle Specie Arboree - IVALSA - Sede Sesto Fiorentino
ISCHP’ 2007 International Scientific Conference on Hardwood Processing,
Sì, ma tipo non specificato
Québec City, Canada
Surface hardness of treated wood has been compared by applying the standards EN 1534 (Brinell method) and ISO 3350 (Janka method). Tests of durability against insects referred to EN 350-1, EN 20-1 and EN 46-1 standards and EN 335 for use class of wood assortments. All treated materials have also been characterised in terms of bonding quality by verifying the strength of the wood-to-wood joint when glued with polyvinyl acetate emulsions belonging to the D2 and D3 class of durability of the standard EN 204. Dimensional and shape stability were then evaluated according to EN 1910, measuring the linear variations and warping of treated wood between dry (20°C, 30% RH) and wet conditions (20°C, (80% RH). Cherry and walnut sawnwood treated with high temperature displayed notable changes in their properties. Hygroscopicity was reduced, and results also revealed an oven dry density reduction, a bending strength decrease, a modulus of elasticity increment in treated wood and an increase in surface hardness. After one month from the beginning of tests, the durability of cherry and walnut against insects was not modified by the thermal treatment. The HTTT in walnut reduced the quality of gluing with PVAc-dispersed products belonging to D3 and D2 classes of durability of EN204, but the application of acetone appreciably increased the performance of the D2-class adhesive. Finally, the thermal treatment stabilized the wood, and the varnish layer could contribute in the same way.
8
none
Brunetti, M; Cremonini, C; Crivellaro, A; Feci, E; Palanti, S; Pizzo, B; Santoni, I; Zanuttini, R
273
info:eu-repo/semantics/conferenceObject
04 Contributo in convegno::04.01 Contributo in Atti di convegno
04.01 Contributo in Atti di convegno
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.14243/433555
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