Wood accelerating drying process based on its rheological...

B - Operations – Transporting – 27 – K

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B27K 5/00 (2006.01) F26B 7/00 (2006.01) F26B 21/06 (2006.01)

Patent

CA 2399853

The objective of the present invention is an accelerated drying process for wood, capable of use with all species and of maintaining the quality of the dried wood intact, in which the temperature of the system is kept within the glass transition temperature range, for an appropriate period so as to attain the intended humidity ratio of the wood. It relates to an accelerated drying process for wood based on the rheological properties (hygro- thermalviscoelastic) of the latter, where the glass transition temperature of lignin is used as a relaxant or neutralization agent for the residual growth stress of trees, as well as those from the drying process. The process is controlled by monitoring the temperatures of the wood through the use of thermocouples placed along the length of the pieces. Furthermore, the use of the process of the present invention provides a significant reduction in the drying time and a reduction of the defects because molecular fluidity is maintained.

La présente invention concerne un procédé de séchage accéléré du bois pouvant être appliqué à tous les types de bois et permettant de maintenir la qualité du bois séché intacte. Ce procédé fait appel à un système fonctionnant dans la plage de température de transition vitreuse de la lignine, pendant un temps donné, permettant ainsi d'atteindre le taux d'humidité souhaité du bois. La présente invention concerne un procédé de séchage accéléré du bois fondé sur les propriétés rhéologiques (hygro-thermo-visco-élasticité) de ce dernier, la température de transition vitreuse de la lignine étant utilisée comme relaxant ou comme agent de neutralisation des contraintes résiduelles de croissance des arbres et de séchage. Ce procédé est mis en oeuvre selon une technique consistant à surveiller la température du bois à l'aide de thermocouples placés le long des pièces de bois. Par ailleurs, le procédé de la présente invention permet de réduire sensiblement le temps de séchage et les défauts du bois, car il permet de maintenir la fluidité moléculaire.

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