Effect Of Particle Shape And Resin Technology On Mechanical Properties Of Particleboard

As the product of modern industry, particleboard is occupying a position in the wood-based panel market with the advantages of raw material and cost. However, the particleboard industry is facing some important concerns. Its low quality, combined with the need to reduce costs and formaldehyde emission by reducing the consumption of resin, is forcing a reexamination of particleboard construction. Compared with foreign countries, resin technology in domestic is relatively backward, resulting in more resin content of particleboard, serious broken shape of wood particles, lower mechanical properties and high production costs. It greatly reduces the market share of particleboard, hinders the healthy development of the particleboard industry.This study explored options to reduce resin content and density by varying particle size and resining technology, and resulting in reducing both formaldehyde emissions and cost without adversely influencing the mechanical properties of particleboard(bending strength, elastic modulus, internal bond strength).The results shows as following:(1) The values of HR and Carr evaluate the reunion and flowability properties of wood particles. The reunion properties of large wood particles is lower than the small wood particles. To keep the low reunion properties values, the size of wood particles should be increased as soon as possible.(2) Adopting new resining technology also can reduce the resin content and enhance the value MOR、MOE、IB of particleboard.(3) Increasing the slenderness ratio of particle, combined with reducing resin content and density could be a way to remain static bending strength and elastic modulus of particleboard; Decreasing slenderness ratio of particle, and reducing resin content、density of particleboard, particleboard could also be maintained within the same bonding strength.(4) 3 Mechanical models are performed: MOR=D2.4693.G.0.3075.(L/t)0.1916.e2.4868 MOE=D.2405.G0.3477.(L/t)0.2327.e6.9449 IB=D1.5102.G1.2252.(L/t)0.1922e-1.1938(5)It is feasible to reduce production cost of particle board and harmful material volatilize quantity by adopting vertical resining technology or controlling the size of the particles to reduce the resin content and the density of particleboard.