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5 SPG1 SPG2 V ac . SPG3 V ac . SPG4 Conv. V ac . 4 3 2 1 0 -1 -2 V ac . Conv. Conv. Conv. Figure 14. Scattergram of MC gradient – C. citriodora Table 7. MC gradient results – C. citriodora Final MC gradient (%) SPG2 SPG3 Vacuum Conventional Vacuum Conventional 0.7 1.0 3.6 2.3 -2.2 -0.1 0.8 0.5 0.0002 1.4 0.6 3.5 3.0 -0.7 -1.0 0.9 0.7 < 0.0001 AA BA Average Maximum Minimum Standard deviation Significance (p) Grade quality (AS/NZS 4787 ) Basic density SPG1 Vacuu m Conventional 1.0 1.3 2.1 2.2 -0.8 0.0 0.6 0.5 < 0.0001 A A SPG4 Vacuum Conventional 0.7 2.0 -1.0 0.7 A 1.5 -0.6 3.0 0.8 < 0.0001 B The basic density results are displayed in Figure 15 and Table 8. Multiple pairwise comparisons produced no significant differences between basic density populations of trials SPG1 and SPG2, and SPG2 and SPG3. All other pairwise comparison combinations produced significant differences between sample populations. The average basic density of trial SPG4 is significantly lower than the other trials. The average basic density recorded for each trial is similar to the value recorded (http://www.fwpa.com.au, 2003) of 865 kg/m3 for mature native forest C. citriodora. 1050 1000 950 900 850 800 750 700 SPG1 SPG2 SPG3 SPG4 Table 8. Basic density results – C. citriodora Trial SPG1 Average 887.4 Maximum 963.4 Minimum 805.0 Standard deviation 34.4 Basic density (kg/m3) SPG2 891.7 1002.7 780.1 44.3 SPG3 904.8 981.2 768.2 42.2 SPG4 852.2 1036.5 735.7 53.3 49 Figure 15. Scattergram of basic density – C. citriodora Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final report Basic density (kg/m3) MC gradient (%)PDF Image | Evaluation of super-heated steam vacuum drying
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