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3 SPG1 V ac . 2.5 2 1.5 1 0.5 0 Conv. SPG2 V ac . Conv. SPG3 V ac . SPG4 Conv. V ac . Conv. Figure 16. Scattergram of drying stress – C. citriodora Table 14. Drying stress results – C. citriodora Average Maximum Minimum Standard deviation Significance (p) Grade quality (AS/NZS 4787 ) Collapse Drying stress (Dstress) Vacuum 0.9 0.6 0.5 1.4 1.0 1.9 0.4 0.1 0.0 0.2 0.2 0.4 SPG1 Vacuum Conventional SPG4 SPG2 SPG3 Vacuum Conventional Vacuum Conventional 0.7 1.4 1.7 2.2 0.0 0.6 0.3 0.3 < 0.0001 1.5 1.6 2.7 2.2 0.2 0.3 0.4 0.3 < 0.0001 BC CC < 0.0001 B B B Conventional 1.3 2.4 0.0 0.4 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 15. 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 15. Sawn orientation results – C. citriodora Quartersawn Backsawn Transitional Gross shrinkage There is no difference between the width and thickness gross shrinkage means for the SPG1 and SPG3 vacuum trials but do exist for the SPG2 and SPG4 vacuum trials (Table 16). This suggests that in terms of shrinkage in the radial and a tangential direction; C. citriodora has less transverse anisotropy compared with the other species reported. The results are in agreement with published tangential (6.1%) and radial (4.3%) shrinkages (http://www.dpi.qld.gov.au, 2008). 52 Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final report < 0.0001 C Sawn orientation (%) SPG1 SPG2 9 2 41 71 50 27 SPG3 SPG4 3 2 73 78 24 20 DstressPDF Image | Evaluation of super-heated steam vacuum drying
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