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Table 43. Sawn orientation results – E. pilularis Sawn orientation (%) Quartersawn Backsawn Transitional BBT1 BBT2 12 7 58 67 30 26 BBT3 BBT4 1 24 46 40 53 36 Gross shrinkage Significant differences exist between the width and thickness gross shrinkage means for all trials suggesting that, in terms of shrinkage in the tangential and radial directions, E. pilularis is not isotropic. The results are higher than published tangential (7.3%) and radial (4.3%) 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. BBT1 BBT2 BBT3 BBT4 Width Thickness Width Thickness Width Thickness Width Thickness 8 6 4 2 0 20 18 16 14 12 10 Figure 37. Scattergram of gross shrinkage – E. pilularis Table 44. Gross shrinkage results – E. pilularis Gross shrinkage (mm) BBT2 BBT3 Width Thickness Width Thickness 8.6 7.1 13.3 14.3 4.9 2.0 0.0370 0.7 2.9 8.9 7.1 13.9 15.9 4.9 3.0 2.0 2.4 < 0.0001 Width Average 9.1 Maximum 16.2 Minimum 3.9 BBT1 Thickness 7.8 18.0 1.0 3.0 BBT4 Width Thickness 8.0 5.5 15.9 14.3 3.0 0.9 2.5 2.5 < 0.0001 Standard deviation Significance (p) 2.8 < 0.0001 Drying times and vacuum kiln output For conventional trial BBT1, the total kiln drying time was 144 days as it was pre-air dried before final kiln drying. The remaining conventional trials were kiln dried from green, whereby the total drying time was 58 days. 75 Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final report Shrinkage (%)PDF Image | Evaluation of super-heated steam vacuum drying
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