Method of seasoning lumber

B - Operations – Transporting – 27 – K

Patent

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B27K 5/00 (2006.01) F26B 5/04 (2006.01) F26B 7/00 (2006.01)

Patent

CA 2081909

A method of seasoning lumber without the occurrence of cracks or warps by raising the turnover ratio of the dryer. In the first step, the lumber is placed into a pressure vessel, and after unifying the temperature within the lumber by charging and discharging of saturated steam in the vessel and fluctuating the steam pressure for pressurizing, the saturated steam maintaining the unified temperature in the vessel is discharged, and by boiling and evaporating the water contained in every tissue of the lumber, it is formed into a state that can be seasoned uniformly. Secondly, the lumber is seasoned by discharging the free water contained in the lumber removed from the pressure vessel. Thirdly, the lumber of which free water is evaporated is placed back into the pressure vessel, and by forming the current of the superheated steam within the vessel, the lumber is pressurized and heated, thus eliminating the contained water. The invention provides no moisture content gradient and no tendency to form moisture content gradient in the lumber.

éthode de séchage du bois d'oeuvre sans apparition de fissures ni gauchissement, par augmentation du taux de rotation du séchoir. Premièrement, le bois est placé dans une enceinte sous pression. Après uniformisation de la température interne du bois par le passage de vapeur d'eau saturée dans l'enceinte et modification de la pression de vapeur pour mettre l'enceinte sous pression, la vapeur d'eau saturée qui maintient la température égale dans l'enceinte est évacuée et par ébullition et évaporation de l'eau contenue dans ses fibres, le bois est placé dans un état favorisant un séchage uniforme. Deuxièmement, le bois est asséché en évacuant l'eau libre que contient le bois retiré de l'enceinte sous pression. Troisièmement, le bois dont l'eau libre a été évaporée est remis dans l'enceinte sous pression et en créant un courant de vapeur surchauffée dans l'enceinte, le bois est mis sous pression et chauffé pour éliminer l'eau qu'il contient. L'invention ne fournit aucun gradient de teneur en humidité et n'a pas tendance à former de gradient de teneur en humidité dans le bois.

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