Treatment of thermally modified wood

Details Treatment of thermally modified wood Treatment of thermally modified wood

B - Operations, Transporting

27

K

B27K 3/36 (2006.01) B27K 5/00 (2006.01)

Patent

CA 2533114

The invention relates to treatment of thermally modified wood. Thermal modification means controlled heating treatment of wood most appropriately under moist atmosphere so as to improve the dimensional stability and decay resistance of the wood. In accordance with the invention, the water absorption tendency of themally modified wood is reduced by treating the wood with a hydrophobic sizing agent reactive with cellulose, the treatment resulting in water-repellent wood. The wood can be treated with a solution containing a sizing agent, and then the solvent is evaporated by drying. Suitable sizing agents comprise alkyl ketene dimers (AKD) and alkenyl succinic acid anhydrides (ASA) dissolved in acetone, for instance. When ASA is used, the dried wood impregnated with the sizing agent requires an additional heating treatment in order to become hydrophobic.

L'invention concerne le traitement de bois thermo-modifié. Une modification thermique consiste en un traitement thermique commandé du bois de manière la plus appropriée sous une atmosphère humide, afin d'améliorer la stabilité dimensionnelle et la résistance à la désintégration du bois. Selon l'invention, la tendance à absorber l'eau du bois thermo-modifié est réduite par traitement du bois au moyen d'un agent de collage hydrophobe réactif avec la cellulose, le traitement permettant d'obtenir un bois hydrophobe. Le bois peut être traité au moyen d'une solution renferment un agent de collage, puis le solvant est évaporé par séchage. Des agents de collage appropriés comprennent des dimères d'alkyl cétène (AKD) et des anhydrides d'acide alcényle succinique (ASA) dissous dans de l'acétone, par exemple. Quand ASA sont utilisés, le bois séché imprégné au moyen de l'agent de collage nécessite un traitement thermique supplémentaire afin de devenir hydrophobe.

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