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BBT2 BBT3 Vacuum Conventional Vacuum Conventional 10.1 49.8 1070.0 615.0 0.0 83.6 < 0.0001 0.0 67.7 1.3 34.3 110.0 270.0 0.0 9.5 < 0.0001 0.0 50.6 AD AD BBT1 Vacuum Conventional End splits (mm) BBT4 Vacuum 2.4 480.0 0.0 34.1 NA A Average Maximum 125.0 Minimum 0.0 Standard deviation 13.3 Significance (p) Grade quality (AS/NZS 4787 ) A Drying stress 2.1 28.5 600.0 0.0 84.8 < 0.0001 D Significant differences exist between the drying stress population means of all trials (Table 42). Both vacuum BBT1 and vacuum BBT2 drying trials achieved unacceptable grade quality results for drying stress (quality C). All other trials achieved acceptable grade quality B or better. Using a milder schedule (higher early WBD) and a higher final equalisation EMC, the BBT3 and BBT4 vacuum trials achieved the acceptable grade quality for drying stress, comparable to the conventional drying trials. 3 BBT1 BBT2 Conv. Vac. BBT3 V ac . BBT4 V ac . 2.5 2 1.5 1 0.5 0 -0.5 -1 Vac. Conv. Conv. Figure 36. Scattergram of drying stress – E. pilularis Table 42. Drying stress results – E. pilularis BBT1 BBT4 Vacuum Conventional Drying stress (Dstress) BBT2 BBT3 Vacuum Conventional Vacuum Conventional 1.0 1.8 0.0 0.4 < 0.0001 0.4 1.1 0.0 0.3 0.5 1.8 0.0 0.4 < 0.0001 -0.1 0.4 -1.0 0.2 CB BA Average Maximum 2.1 Minimum 0.0 Standard deviation 0.4 Significance (p) Grade quality (AS/NZS 4787 ) C Collapse Vacuum 0.4 0.4 1.1 0.7 0.0 0.0 0.4 0.2 NA B B 1.2 < 0.0001 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 43). 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. 74 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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