In order to obtain informations about utilization of particleboard as a substitute for the core of plywood, an oriented particleboard was prepared by a vertical pressing method similar to that used in making extrusion particleboard and then a composite plywood was made with both faces of veneer and a core of the oriented particleboard. The effects of preparation conditions such as the board density, kinds of binder, resin content and orientation of particles on the properties of particleboard were investigated. The physical properties and durability of the composite plywoods having variously reconstituted particleboard cores were examined. From the experimental results it was proved that the particleboard produced by the vertical pressing technique had excellent strength and dimensional stability in the direction parallel to the grain of particles, and the properties of the composite plywood made of a core of oriented particleboard and faces of veneer were comparable to those of plywood.
