Measuring and modelling of process induced discoloration in Tasmanian Blackwood (Acacia melanoxylon)

Process induced discoloration of Tasmanian Blackwood (Acacia melanoxylon) has a significant economic impact on the timber industry in Tasmania Australia. This research aims to reduce hardwood timber discolouration caused by Tasmanian Blackwood drying processes as practiced in Tasmania, Australia which affect the amount of solid timber production waste from sawmill operations. Methods used in this research included site and rack surveys which were analysed using statistical and graphical methods and chemical and biotic analyses. To understand if we could replicate the results in a more economical process, two dimensional hygrothermal simulation was also undertaken. The site-based rack surveys and supporting statistical analysis identified a range of factors contributing to process induced discoloration. The two-dimensional hygrothermal analysis showed a strong correlation between the location of types of discoloration and the movement of heat and moisture within the timber over a two-year simulation period.