Measurement and relevance for timber grading of cracks in softwood logs and sawn timber
2012
Wehrhausen, M. | Brüchert, F. | Sauter, U. H., Forstliche Versuchs- und Forschungsanstalt Baden-Württemberg (FVA), Freiburg i.Br. (Germany)
Cracks in timber of Abies alba Mill. and Picea abies (L.) Karst. are of high importance for the optical and mechanical quality of sawn timber products. A sample of 92 logs was assessed in detail before and after the sawing and drying process. The quantity, types and form of cracks were taken on both round wood and sawn product. Emphasis was put on the question, whether cracks take significant influence on the grading results of the sawn timber according to the grading standards DIN 4074-1:2003-06 and DIN EN 1611-1:1999+A1:2002. The assumption that the amount of cracks increases with the log diameter could not be proved. There is a difference between the two tree species as well as between fresh and dried wood. There were no strong correlations found between specific descriptors of cracks in roundwood and the actual amount of cracks in sawn timber.
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