Abstract
Cutting Power during Milling of Thermally Modified Pine Wood
Highlights
Based on the results of measurements, it was found that, in the case of modified wood, cutting power decreases with an increase in modification temperature and increases with an increase in the working engagement
The experiment indicated a significant reduction of cutting power with an increase in wood modification temperature
Reduced wood density in thermal treatment is caused by the degradation of its components, mainly hemicellulose, to volatile substances, released during wood modification (Bekhta and Niemz, 2003; Pétrissans et al, 2003)
Summary
A further increase in temperature results in changes in the structure of polymer cell wall components, mainly carbohydrates (Hill, 2006; Doczekalska, 2010). Thermal modification of wood results in reduced contents of low-polymer carbohydrates components, depolymerisation of cellulose and a reduction of its crystallinity. Positive effects of these changes include e.g. reduced hygroscopicity and changes in wood colour to darker, resembling that of exotic species (Nakao et al, 1983; Fangel and Wegener, 1984; Jämsä et al, 2000; ThermoWood® Handbook, 2003). Reduced wood density in thermal treatment is caused by the degradation of its components, mainly hemicellulose, to volatile substances, released during wood modification (Bekhta and Niemz, 2003; Pétrissans et al, 2003)
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