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Plate 3. MC resistance probes inserted into a test board The second set of probes was used to determine MC gradient of boards during drying. Plate 4 illustrates the stack preparation method implemented for this study. The 100 sample boards are those with end labels. Shown are the position and labelling of the six test boards where the test boards with the red arrows included specialised instrumentation, and the positioning of the flying wood test board (see section: 3.3.1 Shrinkage and flying wood). Test board 6 Test board 5 Test board 2 Test board 7–flying wood Test board 3 Test board 1 Test board 4 Plate 4. Stack appearance prior to drying showing the position of sample boards (labelled), test boards (red arrows indicate test boards incorporating specialised instrumentation) and the ‘flying wood’ board For the E. obliqua MES1 vacuum drying trial, we stripped boards in two packs separated by bearers. When the average MC of the vacuum dried boards was approximately 15% we removed the top half of the stack from the kiln and reconditioned in a conventional research kiln at 97°C and 100% relative humidity for 6 hours. After reconditioning, the reconditioned and non-reconditioned boards re-entered the vacuum kiln to complete drying. This allowed observations of the effect of reconditioning on collapsed vacuum dried boards and compared with non-reconditioned boards. Specialised instrumentation including anemometers, strain gauges, thermocouples and load cells measured the kiln conditions and wood properties during vacuum drying to test the modelling component of this project. For all trials except SPG1, a 300 mm length section was sawn from the middle of a seventh test board to perform a flying wood test (Brandao and Perré, 1996). 10PDF Image | Evaluation of super-heated steam vacuum drying
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