Drying Stresses in Veneer and Their Relief

Flat sawn, planed 1/8-inch check-free veneer samples of Liquidambar styraciflua L. heartwood were subjected to drying at -7? to 360?F. Small microtome knife-sliced layers were evaluated for casehardening stress based on bow resulting from release of stresses and their corresponding elastic strains. Slices of internally stressed strips bowed instantaneously after slicing and the bowing increased with time. Maximum residual casehardening stresses resulted with drying temper atures from 120?F to 160?P. but some residual stresses also occurred at the extreme test temperatures. In the flat-sawn veneer samples shrinkage in thickness increased as dry temperatures increased, but shrinkage in width decreased to some degree. Stresses were relieved at various temperature and moisture content levels. Stress release of casehardened samples was accomplished within a few minutes provided the temperature was high enough. Dry wood required more heat than moist wood.

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