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Except for the SPG1 and SPG4 vacuum trials and SPG4 conventional trial, unacceptable average cross-sectional MC results were recorded for all other trials in accordance with Australian Standard AS 2796:1999. For the SPG2 and SPG3 conventional and vacuum trials this was due to under-drying and not the spread of final MC. 18 16 14 12 10 8 6 SPG1 SPG2 V ac . Conv. V ac . Conv. SPG3 V ac . Conv. SPG4 V ac . Conv. Figure 13. Scattergram of final MC – C. citriodora Table 6. Final MC results - C. citriodora SPG1 Vacuum Conventional 10.7 13.6 14.5 15.5 8.0 11.7 Final MC (%) SPG4 Vacuum Conventional SPG2 SPG3 Vacuum Conventional Vacuum Conventional 8.8 9.5 11.5 11.3 7.3 0.7 < 0.0001 7.7 0.7 9.5 7.9 11.4 10.2 7.6 0.9 < 0.0001 6.7 0.7 BB 36 84 BC 70 9 Average Maximum Minimum Standard deviation Significance (p) Grade quality (AS/NZS 4787 ) % permissible (AS 2796 ) 1.4 B 90 1.0 < 0.0001 C 66 10.4 13.0 7.7 0.8 B 96 0.056 10.2 11.9 8.2 0.7 B 95 The final MC gradient results are displayed in Figure 14 and Table 7. For each trial there are significant differences between the final MC gradient means of end-matched conventional and vacuum trials. For all trials, the MC gradient results were acceptable in accordance with AS/NZS: 4787. All trials achieved the best grade quality A except for the SPG3 vacuum and SPG4 conventional trials, which achieved grade quality B. The SPG3 vacuum trial B grade is likely because the harshest and fastest, drying schedule was used for this trial. From this author’s experience, generally harsher more accelerated drying schedules tend to amplify the final spread of final average MC, MC gradient and residual drying stress. Thus, drying schedules are often limited by the acceptance level of these parameters. 48 Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final report Final MC (%)PDF Image | Evaluation of super-heated steam vacuum drying
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