Abstract
ABSTRACT Due to the fact that raw timber has permeability characteristics unsuitable for some applications, several processing techniques have been developed, such as hydrothermal treatments and freezing, which aim to improve these properties. The objective of this study was to analyze the effects of treatment temperature and duration on the permeability of Eucalyptus grandis wood. Heartwood samples from three E. grandis trees were utilized, each with the dimensions 30 x 8 x 3 (length, width, thickness). The treatments were carried out at three temperatures (-20°C, 60°C, and 100°C) and three exposure durations (5, 10, and 15 hours). Treatments at -20°C were conducted inside a domestic freezer, while treatments at 60°C and 100°C took place inside a Parr Reactor, while the wood being submerged in water. Extractive removal was only observed at the surface and interior of wood treated at 60°C and 100°C; while all treatment conditions increased permeability with respect to control treatments.
Highlights
During the 1960’s, the first studies into engineering timber permeability utilized thermal treatment, as well as freezing, during the drying of wood
The objective of this study was to analyze the effects of treatment temperature and duration on the permeability of Eucalyptus grandis wood
According to Kamdem et al (2002), the treatment of wood with water alters the physical and chemical properties of the wood; and the magnitude of these changes is dependent on several factors including: treatment temperature, treatment duration, wood chemical composition, anatomical structure of the wood and moisture content
Summary
During the 1960’s, the first studies into engineering timber permeability utilized thermal treatment, as well as freezing, during the drying of wood. These studies illustrated that such treatments both increased the drying rate and reduced the frequency of some timber defects. Hemicelluloses adversely affect the dimensional stability of the timber by allowing the adsorption of water in the form of humidity and may cause defects in the final product. This type of treatment may allow the removal of extractives, non-structural components of wood, and those which are soluble in organic solvents and/or water
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