Use of acousto-ultrasonic techniquesto determine properties of remanufactured particleboards made solely from recycled particles

Properties of particleboard manufactured entirely from recycled particleboard were determined and a method for processing three-layered particleboard from all-recycled particles was described. Dynamic MOE (modulus of elasticity) before and after re-manufacturing was tested by a longitudinal stress wave technique and compared with other stress wave techniques. Nondestructive AU (acousto-ultrasonic) techniques were used to evaluate static, dynamic, and dimensional properties of re-manufactured boards. The results showed a large decrease in mechanical and physical properties for remanufactured boards, particularly for those made from high-density boards. AU parameters corresponded with density in the volume between the surfaces of transducers. Correlation between static MOE and dynamic MOE was improved by using the AU calculated density. Water absorption and thickness swell corresponded with the AU calculated density. Keywords: Particleboard, AU (acousto-ultrasonics), recycle, remanufacture, dynamic MOE (modulus of elasticity), MOR (modulus of rapture), density, water absorption