STUDIES OF THICKNESS SWELLING ON WOOD COMPOSITE Ⅲ. ESTABLISHMENT OF EQUATIONS FOR DEFORMATION IN THE THICKNESS OF PARTICLEBOARD STUDIES ON THICKNESS DEFORMATION OF WOOD COMPOSITE Ⅱ. THE FOUNDATION AND COMMENTING OF DEFORMATION IN THE THICKNESS OF PARTICLEBOARD THE EFFECTS OF ALL MAIN MANUFACTURING FACTORS ON THE THICKNESS SWELLING IN PARTICLEBOARD