using hybrid of fish glue-phenol formaldehyde in plywood manufacturing

in this study, hybrid of phenol formaldehyde-fish glue was used to replace the chemical resin in plywood manufacturing. for this purpose, fish glue was applied at three levels including 0, 10 and 20 percent based on the dry weight of resin. physical and mechanical properties of manufactured plywoods were measured. thickness swelling after 2 and 24 hours immersion in tap water, bending strength, modulus of elasticity and the bonding shear strength of prepared plywoods were measured.the results showed that dimensional stability and thickness swelling upon 2 and 24 hours immersion in water were significantly improved by increasing the fishglue content. on the other hand, by increasing the fish glue content up to 20 percent, bending strength, shear strength and modulus of elasticity (parallel and perpendicular to the grain of top layer) were increased.