- Salamon, M.
- Kozak, A.
Transverse shrinkages of sapwood and heartwood of Douglas-fir were measured on 160 samples from eight young trees. This objective was to compare shrinkage of sapwood and heartwood of samples and furthermore to examine the influence of moisture content, specific gravity, and extractive contents on the magnitude of tangential and radial shrinkages of sapwood and heartwood.
Two series of experiments were carried out, one using isothermic conditions and the other oscillating ambient atmospheric conditions. These led to the following conclusions: Shrinkage in the sapwood was the same as or greater than that of adjacent heartwood, regardless of variations in specific gravity. Total extractive content was shown to have more effect on shrinkage than specific gravity, when the effect of moisture content was removed in an analysis.