Study on the bonding characteristics and mechanism of plant-based powder

Two-ply plywood was manufactured by using kenaf core powder and pine bark powder as adhesives. The effects of hot pressing temperature, hot pressing time, maximum pressure, powder size and powder species on the shear strength of the panel were evaluated. The results showed: plant-based powder had good bonding ability. In a certain range, increasing hot pressing temperature, time and maximum pressure would improve shear strength. The shear strength of the panel also increased with decreasing of powder size. The dry shear strength of the panel using 200 mesh bark powder as adhesive could reach 1MPa that surpassed the III-type National plywood standard. The Scanning electron micrograph of the panel cross section showed finer powder had an intimate contact with the veneers.