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Table 46. Vacuum drying schedules – E. obliqua Trial 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 MES3 and MES4 MES1 MES2 DBT (°C) WBD (°C) EMC (%) DBT (°C) WBD (°C) EMC (%) 44 2.4 18.0 44 2.6 16.0 44 3.2 15.0 45 3.8 14.0 45 4.4 13.0 45 5.2 12.0 48 6.7 10.0 53 9.5 9.0 60 14.0 6.7 67 13.0 6.9 44 2.4 18.0 44 2.8 16.0 44 2.8 16.0 45 3.4 15.0 45 4.8 13.5 45 5.0 12.5 48 7.1 10.0 53 9.5 9.0 60 14.0 6.7 67 13.0 6.9 67 5.4 12.0 67 5.4 12.0 DBT (°C) 44 44 44 45 45 45 58 64 72 80 72 WBD (°C) 2.4 2.8 2.8 3.4 4.8 5.0 7.5 10.0 16.0 13.0 5.5 EMC (%) 18.0 16.0 16.0 15.0 13.5 12.5 10.0 8.4 6.1 6.9 12.5 The initial MC results are shown (Table 47). Multiple pairwise comparisons produced significant differences between sample populations of all trials indicating a high variability in initial MC for this species. The average MC for trial MES3 is almost half of the other two trials (Table 47). As the MES3 vacuum boards were partially dried before testing the results cannot be directly compared with other trials. 180 160 140 120 100 80 60 40 20 MES1 MES2 MES3 MES4 Table 47. Initial MC results – E. obliqua Initial MC (%) Trial MES1 Average 122.0 Maximum 170.7 Minimum 76.5 Standard deviation 20.0 MES2 MES3 MES4 112.5 65.3 98.0 178.3 97.7 144.4 73.2 20.5 69.2 22.7 19.8 20.5 Figure 42. Scattergram of initial MC – E. obliqua Except for trial MES2, we recorded significant differences between the final cross-sectional MC population means of end-matched conventional and vacuum trials (Figure 43 and Table 48). In accordance with both AS/NZS 4787:2001 and AS 2796:1999 all trial achieved acceptable grade quality in terms of average final cross-sectional MC. Vacuum trial MES2 and conventional trial MES 4 resulted in some outlying boards with higher than normal final cross-sectional MC. As the MES3 vacuum boards were partially dried before testing the results cannot be directly compared with other trials. 81 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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