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Figure 4. Automated Meshpore contour generated for Eucalyptus pilularis. We calculated basic density by determining a samples green volume and dry weight in accordance with Australian and New Zealand Standard AS/NZS 1080.3:2000 – Timber – Methods of Test – Method 3: Density (Standards Australia 2000). To ensure samples were fully saturated we placed them in a beaker of water, which we positioned in an airtight container surrounded by an ice/water mixture (Plate 15). The ice water was used to maintain the samples at low temperature to minimise leaching of extractives and provide accurate density measurements. We connected the container to a small vacuum pump and a vacuum pressure of 15 mbar was drawn. The samples remained in this state for approximately 1 hour before slow depressurisation. This was repeated 3 times to ensure the samples were fully saturated. The green volume of the samples was determined using the water immersion method. We dried the samples in a laboratory oven at 103 ± 2°C for 48 hours and weighed to determine the oven dry weight. We calculated sample basic density using: (36) 27 Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final report ρ b = Vm d g Where ρb is the basic density (kg/m3), md is the oven dry mass (kg), and Vg is the green volume (m3). Plate 15. Samples prepared for vacuum saturation (container uncovered for photo) Using the measured fibre porosities, density was calculated to determine if density can be predicted using only these parameters. The formula uses the oven dried density of wood Water/ice mixture Samples in beaker of waterPDF Image | Evaluation of super-heated steam vacuum drying
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