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MES1 Vacuum Conventional 0.1 -0.2 1.8 1.1 -0.7 -0.9 0.5 0.4 < 0.0001 A A Final MC gradient (%) MES4 Vacuum Conventional MES2 MES3 Vacuum Conventional Vacuum Conventional -0.2 0.8 2.6 2.8 -0.9 -1.3 0.6 < 0.0001 0.8 0.3 1.7 -0.7 0.5 0.0002 0.0 1.3 -1.1 0.6 AA AA Average Maximum Minimum Standard deviation Significance (p) Grade quality (AS/NZS 4787 ) Basic density -0.4 1.2 -2.1 0.4 A 0.4 3.1 -2.3 0.9 A < 0.0001 The basic density results are displayed in Figure 45 and Table 50. Multiple pairwise comparisons produced no significant differences between basic density populations of trials MES1 and MES2, and MES3 and MES4. The average basic density recorded for each trial is considerably lower than the value reported by (Bootle, 2004) of 630 kg/m3 for mature native forest E. obliqua. As the MES3 vacuum boards were partially dried before testing the basic density results for this trial may be erroneous as some of the sections tested were not fully saturated and cannot be directly compared with other trials. 750 700 650 600 550 500 450 400 350 MES1 MES2 MES3 MES4 Table 50. Initial basic density results – E. obliqua Basic density (kg/m3) MES1 MES2 476.1 491.2 621.1 618.5 388.2 375.5 58.7 54.6 MES3 569.5 829.9 451.3 67.7 MES4 544.7 696.2 419.2 64.1 Trial Average Maximum Minimum Standard deviation Figure 45. Scattergram of basic density – E. obliqua Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final report 83 Basic density (kg/m3)PDF Image | Evaluation of super-heated steam vacuum drying
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