Wood hardening procedures

B - Operations – Transporting – 27 – K

Patent

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Details

B27K 3/08 (2006.01) B27K 3/15 (2006.01) B27K 3/34 (2006.01) B27K 3/36 (2006.01)

Patent

CA 2608040

A process for providing a hardened wooden product from a source wooden item, said process comprising or including loading a pressure vessel with sapwood items of sufficient dryness, drawing a reduced pressure in the closed pressure vessel, immersing the sapwood in the pressure vessel in an aqueous aminoplast resin impregnating composition ('aqueous formulation"), pressurising the impregnating composition in the treatment vessel, removing excess impregnating composition from the fully impregnated sapwood in the pressure vessel, lowering the pressure in the vessel, opening the pressure vessel, removing the impregnated sapwood from the pressure vessel, subjecting the removed impregnated sapwood to conditions to reduce its moisture content, subjecting the dryer impregnated sapwood to conditions to facilitate curing, subjecting the at least substantially cured impregnated sapwood to conditions to further reduce the moisture content thereof thereby to derive the hardened sapwood product.

L'invention concerne un procédé permettant d'engendrer un produit en bois durci à partir d'un article en bois de source. Ce procédé consiste à charger un récipient sous pression avec des articles en aubier suffisamment secs, à amener une pression réduite dans ledit récipient sous pression fermé, à immerger l'aubier du récipient sous pression dans une composition d'imprégnation de résine d'aminoplaste aqueuse ("préparation aqueuse"), à mettre sous pression la composition d'imprégnation dans le récipient de traitement, à éliminer l'excès de ladite composition de l'aubier entièrement imprégné dans le récipient sous pression, à abaisser la pression dans le récipient, à ouvrir ledit récipient, à éliminer l'aubier imprégné dudit récipient, à soumettre l'aubier imprégné éliminé à des conditions visant la diminution de son contenu d'humidité, à soumettre l'aubier imprégné du dispositif de séchage à des conditions visant à faciliter le durcissement, à soumettre l'aubier imprégné sensiblement durci à des conditions destinées à diminuer encore plus le contenu d'humidité, ce qui permet de dériver le produit en aubier durci.

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