Abstract
Particle size and press time are always two effective factors in the manufacturing of particleboard. In this work we have investigated the effect of these factors on thin particleboard. Experimental 3 mm panels were made while particle size, press time and type of resin have been changed in 4, 3 and 3 levels respectively. Modulus of rupture, internal bond strength, modulus of elasticity, water absorption (2 and 24 h) and thickness swelling (2 and 24 h) of the panels made with a target density of 0.65 g/cm3 were investigated. Based on the results of this work, the particleboards made from phenol formaldehyde resin with mixed size particles in 180 s press time, showed the maximum flexural strength (18/46 MPa). The highest MOE (2027/55 MPa) was found for particleboards that made from melamine formaldehyde resin with particle in size −12 + 18 mesh and 120 s press time. Internal bonding of the panels made with melamine formaldehyde resin, particle size −12 + 18 mesh and 180 s press time exhibited the best results (1/75 MPa). Besides, the best panels in term of thickness swelling were made from phenol formaldehyde with particle size −8 + 12 mesh and 180 s press time. The lowest amount of water absorption for panels manufactured from phenol formaldehyde resin with mixed particles and −18 + 20 mesh and 180 s press time happened.
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