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Figure 2. Diagram of ripping method for assessing drying stress (image taken from AS/NZS 4787:2001) Collapse Collapse observations occurred for each sample board at the completion of drying, on a present or absent basis, by inspecting the wide face surfaces. For the vacuum trial drying E. obliqua (MES1), a highly collapse prone species, scanned cross sections were analysed using MeshPore (Perré, 2005a), an image analysis software package developed to characterise the morphology and produce finite element meshes of wood anatomy. For the purpose of this study, we used MeshPore to determine the area of board cross sections as an aid to quantify collapse. In line with industry practice, we deemed collapse present in boards after dressing to be unacceptable. Sawn orientation We classified sawn orientation into three groups: q (quarter sawn), t (transitionally sawn) and b (backsawn). Transitionally sawn boards are boards with a sawn orientation between quarter and backsawn. Gross shrinkage We measured width and thickness at the centre of each of the sample board’s length before drying. This was repeated at the same position for the undressed dry boards. We used these measurements to calculate the gross percentage shrinkage from green to dry using equations 2 and 3. Width shrinkage (%) Thickness shrinkage (%) Where, Wg = board width green Wd = board width dry Tg = board thickness green Td = board thickness dry. W −W = g d ×100 (2) (3) Wg T −T = g d ×100 Tg 8PDF Image | Evaluation of super-heated steam vacuum drying
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