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4. Modification of usage properties, quality
The purpose of treatment is to modify the material's macro-scopic or "use" properties. Wood is treated in its mass, and it is therefore possible to re-machine parts without losing the benefits of the treatment. Retification is accompanied by a loss of sample mass coupled with anisotropic volume shrinkage of the structure. On leaving the kiln, retified wood emits an odor similar to that of roasted coffee, which diminishes over the course of a few days and then disappears. One of the most important commercial characteristics is the darkening of the material. Measuring color and mass loss are the simplest tools of quality control.
4.1 Color measurement
Chemical changes in the wood's components darken its color, bringing it closer to that of exotic woods. The higher...
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Modification of usage properties, quality
User guide and applications
Bibliography
Patents
Anti-shrink treatment for wood United States Patent Office 2,296,316 Alfred J. Stamm 09, 22 (1942)
Process for manufacturing a lignocellulosic material by heat treatment and materials obtained by this process n° 8614138, ARMINES (1986)
Process for manufacturing an agglomerated material based on a lignocellulosic material and material obtained by carrying out this process. N° 87...
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Standards and norms
- Wood – Determining shrinkage - NF B51-006 - 1985
- Wood – Static bending test – Determination of the static bending strength of small flawless specimens - B 51-008 - 1987
- Wood – Determination of Monnin hardness - NF B51-013 - 1985
- Durability of wood and wood-based materials – Classes of use: definitions, application to solid wood and wood-based materials - NF EN 335 - 2013
- Durability of...
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