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Table 31. E. marginata results summary Species Trial ID. Drying method E. marginata 2 (JAR1) vacuum conventional (kiln) significance (p) 6 (JAR2) vacuum conventional (kiln) significance (p) 10 (JAR3) vacuum conventional (kiln) significance (p) 14 (JAR4) Days drying [% of conventional kiln drying time ] 25.6 [42] 61 19.5 [32] 61 24.9 [41] 61 61 Initial basic density (kg/m3) [stdev.] 667.8 [48.5] 663.0 [39.5] 654.6 [43.6] Initial MC (%) [stdev.] 72.0 [10.7] 73.5 [8.2] 74.2 [8.7] Final MC (%) average [stdev.] {grade}* 12.2 [2.4] {D} 10.9 [0.9] {B} <0.0001 11.6 [2.0] {B} 14.4 [0.9] {D} <0.0001 12.2 [1.1] {B} 10.6 [0.5] {B} <0.0001 <0.0001 Final MC % select grade (%)** 83 100 91 41 94 100 MC gradient (%) [stdev.] {grade}* 1.3 [1.2] {B} -1.4 [0.6] {A} <0.0001 0.4 [1.7] {B} 0.9 [0.3] {A} <0.0001 0.3 [1.5] {A} -0.6 [0.5] {A} <0.0001 0.9 [0.6] {A} 0.106 Drying stress grade quality [stdev.] {grade}* 0.13 <0.0001 0.8 [0.7] {C} -0.5 [0.4] {A} <0.0001 0.606 Distortion % in grade** [major type] 96 [twist] 92 [twist] 96 [twist] 91 [twist] 94 [twist] Collapse (% affected) 0 0 0 0 0 0 0 Surface check % select** [%check free] 89 [69] 94 [86] <0.0001 83 [40] 97 [91] <0.0001 97 [93] 99 [84] 0.03 100 [95] <0.0001 Internal check % check free 100 100 100 100 100 100 100 End split grade* A C 0.0002 A A 0.0008 A A 0.05 A 0.955 vacuum 25.4 [42] 661.8 [42.3] 72.5 [9.3] 16.2 [2.1] {F} 12 1.0 [1.5] {D} 0.8 [0.6] {C} 94 [twist] 0 93 [57] 100 A conventional (kiln) significance (p) * AS/NZS 4787:2001 Timber-Assessment of drying quality. ** AS 2796: 1999 Hardwood-Sawn and milled products. 1.5 [0.8] {D} 61 [twist] 1.4 [0.5] {C} 79 [twist] 0.6 [0.7] {C} 1.2 [0.3] {C} 12.9 [0.7] {C} 89 0.8 [0.3] {C} Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final report 67PDF Image | Evaluation of super-heated steam vacuum drying
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