Process for treating wood

B - Operations – Transporting – 27 – K

Patent

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Details

B27K 3/08 (2006.01) B27K 5/04 (2006.01)

Patent

CA 2248211

A process for treating wood involving impregnation of the wood with a preservative followed by the heat-fixation of the preservative in the wood using a pre-heated aqueous heat tansfer fluid to effect the heat fixation of the preservative. The process particularly relates to steps which are taken to reduce the level of any contamination of the aqueous heat transfer fluid resulting from any wood extractives, any unfixed preservative and/or any particulate matter (i.e. "sludge") that may be present in the fluid. The contamination is preferably reduced by incorporating in the heat transfer fluid an oxidant which will preferentially oxidize any wood extractives resulting from the contact of the treated wood with the fluid without any significant reaction occurring between the oxidant and the preservative. Useful oxidants include inorganic chlorate salts such as sodium chlorate.

Le procédé de traitement du bois implique l'imprégnation dans le bois d'un agent de conservation, ce processus d'imprégnation étant suivi d'une fixation par application de chaleur de l'agent de conservation dans le bois à l'aide d'un fluide aqueux préchauffé de transfert de chaleur permettant d'effectuer la fixation thermique de l'agent conservateur. Le procédé se caractérise par les mesures qui sont prises afin de réduire le niveau de contamination du fluide aqueux de transfert thermique, due à d'éventuels agents d'extraction du bois, agents de conservation non fixés et/ou matières particulaires (par exemple des "boues") pouvant se présenter dans le fluide. La contamination est réduite de préférence par l'incorporation dans le fluide de transfert thermique d'un agent d'oxydation qui va oxyder tout agent d'extraction du bois résultant du contact du bois traité avec le fluide, sans pour autant qu'une réaction significative se produise entre l'agent d'oxydation et l'agent de conservation. Des agents d'oxydation utiles sont les sels de chlorates inorganiques tels que le chlorate de sodium.

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