Heat Treatment of Wood in Liquids

Abstract:

Modern alternative to chemical methods of wood modification is heat treatment, which allows to increase biological stability, to reduce the hygroscopicity of the material and to improve the appearance of products. One of such technologies is heat treatment in liquids. However, this method is characterized by a considerable duration of the process because of cooling the material directly in the liquid. The aim of this work is to improve the technology of thermal modification of wood in liquids by reducing the duration of cooling phase without additional energy consumption. The results of experimental studies of the proposed technology of heat treatment of wood are presented. The obtained data on changes in wood density show that at increasing the average density of the material, there is a reduction in the density of its central layers that is explained by impregnation of the surface layers of wood with wood agent. It can be stated, basing on the analysis of the depth of impregnation of different wood species, that the rate of flow of impregnating liquid is directly proportional to the temperature of heat treatment, in the same time the depth of penetration of the treatment agent into the lumber depends not on treatability of natural wood but its basic density. Therefore, heat treatment of wood in hydrophobic liquids is more rational to use for hard species with greater density, and consequently, a smaller depth of penetration of the treatment agent, which will reduce the flow rate of hydrophobic liquid when carrying out the process and avoid large losses of material during subsequent mechanical processing.

• Periodical: Solid State Phenomena (Volume 284)
• Pages: 975-980
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.284.975
• Online since: October 2018
• Authors: Ruslan R. Safin*, Elena A. Beliakova, A.R. Mukhtarova
• Keywords: Color, Liquid, Thermo Modification, Wood

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