In a study funded jointly by Metla and the Finnish Forest Industries Federation green wood density factors were determined for the main roundwood types in different geographical areas. The factors were determined years ago but had to be updated. Especially the rate of roundwood procurement has changed a lot since the currently used green wood density tables were adopted, so there was reason to suspect that the tables were partly unreliable. It was not possible to suggest an update version for all parts of the tables, but clear differences were found in the status.
The results presented a common feature for almost all roundwood types, especially pulpwood: seasonal variation was less than in the previous tables. For pine and spruce logs the wood densities for winter and spring green wood were lower than in the currently used tables. For pine and spruce pulpwood the summer and autumn green density factors were higher, which can be assumed to be a consequence of the shorter storage times in forests. In contrast, for birch pulpwood the green density factors were lower or at the same level throughout the year as in the current tables. The green wood density figures for coniferous pulpwood were fairly similar to those for pine pulpwood, only slightly lower. Seasonal variation was observed in green wood density factors for cellulose fibre spruce, considerably more than for mechanical pulpwood spruce.
Project 7181: National wood density factors based on the sampling for weight scaling method.
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