Particleboard manufacturing using tannin-modified urea formaldehyde adhesive

This study provides an investigation of particleboard manufacture using tannin-urea formaldehyde adhesive. Test board samples were made with regard to various replacement percentage of tannin–urea (levels of 0, 10, 20 and 30%) and press time (12 and 15 min) and their properties were determined. Achieved data were analyzed according to two sides factorial plan. The results showed that with replacement of 10% urea formaldehyde adhesive by tannin-formaldehyde at both 12 and 15 min pressing times, thickness swelling (after 2 and 24 hours immersion in water) was decreased while internal bonding increased. There were no significant effect on modulus of rupture and modulus of elasticity values. In general, the results of present research showed that replacing the UF resin at lower levels of tannin is suitable as adhesive to manufacture particleboard so that with replacement ratio of 90:10, the moisture properties of boards were very close to permissible those of the exterior wood uses.