Properties of Plywood Panels Composed of Thermally Densified and Non-Densified Alder and Birch Veneers

Ukrainian companies mainly use birch in the manufacture of plywood, but species, such as black alder, are not yet widely used plywood due to their poorer properties. It is well known that thermal compression often improve properties solid wood. Good lay-up schemes veneer can maximize advantages and minimize disadvantages these wood generally utility value plywood. This research aimed develop panels with two species types treatments order evaluate influences different on Five-layer were formed 16 using (Betula verrucosa Ehrh.) (B) alder (Alnus glutinosa L.) (A) veneers, which non-densified (N) thermally densified (D). The identify opportunities mechanical physical by replacing structure an alternative veneer. sheets a laboratory hot press at temperature 180 °C pressure 2 MPa for 3 min. conducted study showed bending strength, modulus elasticity shear strength mixed-species (BD–AN–AN–AN–BD) increased up 31.5%, 34.4% 16.8%, respectively, comparison those from (AN–AN–AN–AN–AN), positioning veneers core layers outer layers. Moreover, surface roughness was lower than shown non-treated veneer, despite exhibiting somewhat could be successfully proper veneer-based products industry.