Transverse Anisotropy and Dimensional Stability of Thermal Treated Beech Red Heartwood

Abstract

This research is mainly focused on the impact of thermal modification on the transverse anisotropy and dimensional stability of native beech wood (Fagus sylvatica L.) and beech red heartwood. Applied to two time-temperature regimes, the first period of maximum temperature to 180° C and the second to 230° C. The factor of anisotropy in native beech wood is 1.29 and beech red heartwood is 1:24. Dimensional stability of the native beech wood is improved for 33.3% and beech red heartwood for 29.1%. The changing of the volume mass per thermal modification of 6% is too small and does not affect other properties.

An Investigation on the Visible Characteristics of Four Caesalpiniaceae Wood Species in Gabon

“…Particularly, for one species, surface glossiness values parallel to the wood grain direction were generally higher than those perpendicular to grain. The main reason for these results was its unique structural characteristics, mainly from the anisotropic structure of wood [20,21]. The longitudinal surface of the wood after smooth shaving was observed to have numerous narrow cell lumens with many indentations When light emitted along the wood grain, the light entered the cell cavity could be refracted directly along the long axis of the cell with little energy loss.…”