Abstract
Summary 20-year-old plantation-grown Eucalyptus nitens Maiden (shining gum) trees were examined for the production of structural and appearance products from sawn timber. Log characteristics were examined and measurements made of peripheral longitudinal strain. Basic density and mechanical strength characteristics of sawn timber were determined. Four commercial drying schedules were applied to 25 mm and 50 mm thick back—and quarter-sawn products. Measurements for twist spring, bow, width and thickness were made on the 50 mm boards before and after seasoning, and all boards were machined and graded to Australian Standard (AS) 2082 “Visually stress-graded hardwood for structural purposes”. The logs contained a high proportion of sapwood, and the basic density of the wood was lower than that reported for heartwood of mature E. nitens, though the moduli of rupture and elasticity, and crushing strength were comparable. The method of sawing only influenced the amount of bow in freshly sawn products. Drying redu...
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