Abstract:

Saw cutting wood sheet of Populus ussuriensis, rotary cutting wood sheet of Betula platyphylla and planer slicing wood sheet of Tilia amurensis were dipped in water under normal temperature until water-saturated, and then were compressed perpendicular to grain. The micro-structure at across-grain section and along-grain section of wood sheets before and after compression were examined with scanning electron microscope, and aimed to probe the feasibility of this wood sheets strengthened method. The results showed that: the entirety compression deformations of these three species were relatively even and well-distributed, no obvious differences between the surface and the internal. There were no cracks or breaks found at both across-grain and along-grain sections. At along-grain section, the transverse wrinkles at along-grain direction were observed. At across-grain section, the vessel deformation of Populus ussuriensis and Tilia amurensis along compression direction were most obvious, and that vessel deformation of Betula platyphylla was also observed remarkable along its longitude direction, which simultaneously caused the distortions of bilateral xylem ray cells and the fiber cells that arrayed along radial and compression direction.

Key words: compression perpendicular to grain, strengthen, wood sheet, micro-structure, scanning electron microscope