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4 JAR1 JAR2 V ac . Conv. V ac . 3 2 1 0 -1 -2 Conv. JAR3 V ac . Conv. JAR4 V ac . Conv. Figure 26. Scattergram of drying stress – E. marginata Table 28. Drying stress results – E. marginata JAR1 Vacuum Conventional Drying stress (Dstress) JAR4 Vacuum Conventional JAR2 JAR3 Vacuum Conventional Vacuum Conventional 0.6 3.0 0.0 0.7 < 0.0001 1.2 2.4 0.5 0.3 0.8 2.6 0.0 0.7 < 0.0001 -0.5 1.0 -1.4 0.4 CC CA Average Maximum 3.1 Minimum 0.0 Standard deviation 0.8 Significance (p) 0.13 Grade quality (AS/NZS 4787 ) D Collapse 1.5 1.4 2.7 2.4 0.1 0.0 0.5 0.6 C C 0.8 0.8 1.3 0.0 0.3 C 0.606 No signs of collapse were present for any boards from any trial. Sawn orientation The majority of boards were a combination of back sawn and transitionally sawn (Table 29). Backsawing is the desired cutting pattern for this species as it usually provides a higher green off-saw (GOS) recovery than quartersawing, and better aesthetics because of growth ring orientation. Table 29. Sawn orientation results – E. marginata SPG1 SPG2 Sawn orientation (%) Quartersawn Backsawn Transitional 9 2 41 71 50 27 SPG3 SPG4 3 2 73 78 24 20 Gross shrinkage Significant differences exist between the width and thickness gross shrinkage means for all trials suggesting that, in terms of shrinkage in the radial and tangential directions, E. marginata is not isotropic. The results are considerably higher than published tangential (7.4%) and radial (4.9%) shrinkages (http://www.dpi.qld.gov.au, 2008). The results may be somewhat skewed however, as the outlying high shrinkage samples correspond to those boards that were cupped. Unfortunately, a PLC circuit board malfunction cut short the JAR4 trial; consequently, we cannot directly compare the results with the other trials. 63 Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final report DstressPDF Image | Evaluation of super-heated steam vacuum drying
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