A method of performing an impregnating treatment on a...

B - Operations – Transporting – 27 – K

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B27K 3/02 (2006.01) B27K 3/34 (2006.01) A62D 3/00 (2006.01)

Patent

CA 2350799

The impregnating or extracting treatments of resin-containing wood substrate using a resin-soluble supercritical fluid as delivering or extractive solvent medium problems due to exudation of resin from the wood substrate at pressure release necessary before the termination of the treatment are avoided or reduced by displacing at least partially the supercritical fluid by a fluid of relatively low solubility in the resin before pressure release down to atmospheric pressure is terminated. Thereby the total process time can be substantially reduced.

Lors des traitements d'imprégnation ou d'extraction réalisés sur des substrats de bois contenant de la résine au moyen d'un fluide supercritique soluble dans la résine en tant que milieu solvant d'imprégnation ou d'extraction, au moment de la décompression nécessaire à la réalisation du traitement, une exsudation de la résine hors du substrat de bois se produit. Pour éviter ou réduire les problèmes qui en découlent, on déplace au moins partiellement le fluide supercritique à l'aide d'un fluide à solubilité relativement basse dans la résine, avant que la pression ne soit baissée au niveau de la pression atmosphérique. Le temps total de traitement peut ainsi être sensiblement réduit.

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