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18 BBT1 V ac . 16 14 12 10 8 6 4 Conv. BBT2 V ac . Conv. BBT3 V ac . Conv. BBT4 V ac . Figure 33. Scattergram of final MC – E. pilularis Table 34. Final MC results – E. pilularis BBT1 Vacuum Conventional 10.8 10.5 15.2 11.1 8.8 10.0 1.3 0.2 0.1620 B A 94 100 Final MC (%) BBT4 Vacuum 11.8 15.5 10.2 1.0 NA A 96 BBT2 BBT3 Vacuum Conventional Vacuum Conventional 12.0 7.8 16.8 8.8 10.2 5.4 1.4 0.6 < 0.0001 11.4 8.7 14.8 9.9 10.0 7.2 1.0 0.6 < 0.0001 BD 93 0 AD 97 38 Average Maximum Minimum Standard deviation Significance (p) Grade quality (AS/NZS 4787 ) % permissible (AS 2796 ) For each trial, we recorded significant differences between the final MC gradient means of end- matched conventional and vacuum trials (Figure 34 and Table 35). All trials achieved acceptable grade qualities (B or A) for final MC gradient. However, vacuum trials BBT1, BBT2 and BBT3 produced boards with high outlying MC gradients as observed via the scattergrams. 5 BBT1 4 V ac . 3 2 1 0 -1 -2 Conv. BBT2 V ac . Conv. BBT3 V ac . Conv. BBT4 V ac . Figure 34. Scattergram of MC gradient – E. pilularis Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final report 70 MC gradinet (%) Final MC (%)PDF Image | Evaluation of super-heated steam vacuum drying
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