Thermal treatment of hardwood species from Italian plantations: preliminary studies on some effects on technological properties of wood (Contributo in atti di convegno)

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Label
  • Thermal treatment of hardwood species from Italian plantations: preliminary studies on some effects on technological properties of wood (Contributo in atti di convegno) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Brunetti M., Cremonini C., Crivellaro A., Feci E., Palanti S., Pizzo B., Santoni I., Zanuttini R. (2007)
    Thermal treatment of hardwood species from Italian plantations: preliminary studies on some effects on technological properties of wood
    in ISCHP’ 2007 International Scientific Conference on Hardwood Processing,, Québec City, Canada
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Brunetti M., Cremonini C., Crivellaro A., Feci E., Palanti S., Pizzo B., Santoni I., Zanuttini R. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#altreInformazioni
  • 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. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • September 24-26, pagg.325-333 http://www.ischp.ca/index07.asp (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • High Temperature Thermal Treatment (HTTT) is generally used in order to improve both the technological performances of the raw material and its aesthetic appearance; as a matter of fact, wood modification by HTTT is well known as an interesting solution for improving the dimensional stability,the durability and the uniformity of the colour of the solid wood of coniferous species with limited decrease of the mechanical properties (Jämsä and Viitaniemi 2001). At present in Italy the aim of HTTT is to reach more interesting and remunerative uses of low quality hardwood, with potential applications for solid wood panels, flooring, furniture and cabinets or other uses in indoor conditions. This paper reports a preliminary evaluation on the effects of HTTT carried out on two Italian hardwoods (European walnut and cherry) in terms of modification of some technological properties of wood, such as surface hardness, durability against insects and dimensional stability. (literal)
Titolo
  • Thermal treatment of hardwood species from Italian plantations: preliminary studies on some effects on technological properties of wood (literal)
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