Effect of Graphite powder on thermal conductivity, physical and mechanical properties of 3-layer particleboard

This study، has investigated effect of using graphite powder on thermal conductivity during the time of production in three-layer boards made of planer shaving particles (70% in the middle layer) and the particles poplar (30% of the surface) at 4 levels of 0، 5، 10 and 15% (oven dry adhesive). After that physical properties and mechanical strength measured. Overall، results have shown that use of graphite powder، increases amount of thermal conductivity significantly. Also found that modulus of rupture and modulus of elasticity had significantly increased and the thickness swelling and water absorption decreased، but they had no significant effect on shear strength parallel to surface. So the boards produced by 15% graphite powder had maximum amount of modulus of rupture (18. 42 MPa) and modulus of elasticity (2298MPa) and also had minimum amount of water absorption and thickness swelling.