Abstract

The effect of compression wood, spiral grain and grain angle on deformations of studs from 22-yr-old Scots pine trees was studied. Spiral grain angle was measured on the mantle surface of logs and grain angle on the tangential faces of studs. Bow, spring and twist were measured on studs at green condition and at 18% and 12% moisture content. From each stud four 3 mm thick cross-sections were sawn. The compression wood content and its position within cross-sections were analysed using image analysis. For the short sections, located between cross-sections, bow and spring, but not twist, were significantly correlated with the amount and the position of the compression wood content. Twist was significantly correlated with spiral grain angle and grain angle. In Conclusion, this study suggests that the compression wood content and its position within cross-sections have an effect on deformations such as bow and spring. It is however, evident that the spiral grain angle and the grain angle have a major effect on twist deformations

Published in

Scandinavian Journal of Forest Research
2004, volume: 19, pages: 48-54
Publisher: TAYLOR & FRANCIS AS

Authors' information