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Dale and Meyers Sawmill (Maryborough, Queensland) supplied material for conventional trials SPG1, SPG3 and SPG4 and Burnett Sawmill (Bundaberg, Queensland supplied material for conventional trial SPG2. Commercial confidentiality prevents details of the conventional drying schedule used by either sawmill from being discussed. Table 4. Vacuum drying schedules – Corymbia citriodora Trial SPG4 DBT (°C) WBD (°C) 64 1.8 64 5.0 65 5.4 66 5.8 66 6.2 67 7.1 69 8.9 71 12.0 75 18.0 80 13.0 80 4.5 SPG1 and SPG2 DBT (°C) WBD (°C) EMC (%) 60 2.4 17.0 60 5.0 12.0 61 5.4 12.0 63 6.0 11.0 64 6.2 11.0 65 7.1 10.0 67 9.1 9.1 69 12.0 7.4 72 18.0 5.4 77 13.0 6.9 SPG3 DBT (°C) WBD (°C) EMC (%) 64 1.8 18.0 64 5.0 12.0 65 5.4 12.0 66 5.8 11.0 66 6.2 11.0 67 7.1 10.0 69 8.9 9.1 71 12.0 7.4 75 18.0 5.5 80 13.0 6.9 80 4.7 13.0 MC change points (%) Heat-up Green - 70 70-60 60-50 50-40 40-30 30-25 25-20 20-15 15 - final Equalise (48 hrs) Moisture content 70 4.8 12.0 EMC (%) 18.0 12.0 12.0 11.0 11.0 10.0 9.1 7.4 5.5 6.9 (72 hrs) 13.5 Initial MC results are shown in Table 5. For trial SPG1, initial MC populations are normally distributed, but are not normally distributed for the other trials, likely because of high MC outliers (Figure 12). Multiple pairwise comparisons produced no significant differences between sample populations of trials SPG1 and SPG4. All other pairwise comparison combinations produced significant differences between sample populations. This is evident by observation, where the initial cross-sectional MC average of trials SPG2 and SPG3 was approximately 3% lower for each successive trial compared with trials SPG1 and SPG4. 60 SPG1 SPG2 55 50 45 40 35 30 25 20 SPG3 SPG4 Table 5. Initial MC results – C. citriodora Trial Average Maximum Minimum Standard deviation Initial MC (%) SPG1 SPG2 37.9 34.8 46.4 51.5 28.2 22.4 3.8 5.5 SPG3 SPG4 32.3 37.3 50.6 54.8 23.1 27.3 4.8 5.0 Figure 12. Scattergram of initial MC – C. citriodora The final cross-sectional MC results are presented in Figure 13 and Table 6. Except for trial SPG4, there are significant differences between the final cross-sectional MC means of end- matched conventional and vacuum trials. In accordance with AS/NZS: 4787 each vacuum trial, and SPG2 conventional trial achieved acceptable grade quality B results for final cross- sectional MC (target = 11%). Both conventional SPG1 and SPG3 trials achieved unacceptable grade quality C due to, • under-drying in the case of the SPG1 trial (average 13.6%) and • over-drying in the case of the SPG3 trial (average 7.9%). 47 Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final report Initial MC (%)PDF Image | Evaluation of super-heated steam vacuum drying
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