Characterization of Quartersawn Beech Sapwood

The quartersawn common beech (Fagus sylvatica L.) sapwood planks, stored for two years in a room with air relative humidity of 30% and temperature 23 °C, were selected as a studied wooden substrate material. The gravimetrically determined nominal density of wood with (7.1 ± 0.4)% moisture content was (688.7 ± 24.5) kg × m^–3. The wood was mechanically processed by sawing and peripheral planing into eight samples with dimensions (400 mm × 70 mm × 20 mm) and corresponding wood grain orientation longitudinal × radial × tangential (L × R × T). The samples were furtherly divided to the smaller samples for each analysis, as schematically presented in Fig. 1. All the analyses were conducted on the surfaces with R wood grain orientation, which were manually sanded with rotational-vibrational sanding machine (paper grit P180).Figure 1

Distribution of wood samples preparation for different studies. The numbers present the sample size in individual wood grain direction (in millimeters): L—longitudinal, R—radial and T—tangential.