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Gross shrinkage Width and thickness vacuum drying gross shrinkage results, split into non-reconditioned (n-r) and reconditioned (r) groups, are presented in Figure 48 and Table 59. Significant differences exist between the width and thickness gross shrinkage means of reconditioned and non– reconditioned samples for each trial (p<0.0001). The reduction of gross shrinkage (width and thickness) for the reconditioned samples is due to collapse recovery. As the MES3 vacuum boards were partially dried before testing the results can not directly be compared with other trials. This is evident from the lower shrinkage values recorded for this trial, as slower pre-drying usually causes less collapse to occur. than published tangential (8.9%) and radial (4.4%) shrinkages (Bootle, 2004) due to the presence of collapse shrinkage. MES1 MES2 MES3 MES4 Width. Thick. Width Thick. Width Thick. Width Thick n-r r n-r r n-r r n-r r n-r r n-r r n-r r n-r r 5 0 30 25 20 15 10 Figure 48. Scattergram of gross shrinkage – E. obliqua Table 59. Gross shrinkage results – E. obliqua Trial Average Maximum Minimum Standard deviation Average Maximum Minimum Standard deviation Average Maximum Minimum Standard deviation Average Maximum Minimum Standard deviation Gross shrinkage (mm) Not reconditioned Reconditioned Width Thickness 7.0 11.6 16.0 23.2 2.4 5.8 2.8 4.6 9.9 10.3 13.7 17.5 4.9 5.6 2.4 3.1 6.7 6.9 14.0 19.8 2.2 1.0 2.4 3.5 8.4 11.6 13.9 23.6 4.6 3.7 2.4 3.6 MES1 MES2 MES3 MES4 Width 8.5 14.4 2.5 3.0 11.6 20.0 4.6 3.1 7.4 15.1 1.4 2.8 10.6 17.2 6.6 2.8 Thickness 15.8 24.9 6.5 5.7 16.7 28.7 3.9 5.4 9.1 20.3 1.8 4.6 15.0 27.8 6.3 4.8 Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final report The results are higher 89 Shrinkage (%)PDF Image | Evaluation of super-heated steam vacuum drying
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