Conventional hot pressing has been commonly used in manufacturing thin medium density fiberboard.However,when manufacturing thicker medium density fiberboard,it is found to take a longer pressing cycle to transfer the heat from the surfaces of the panel to the core.The steam injection-vacuum hot pressing technique was developed to improve pressing efficiency and productivity.This steam injection-vacuum technique was modified and adopted in this study to accommodate a domestic medium density fiberboard production line.It was found that this modified line had improved production capacity and the performance of products,with nominal thicknesses of 30 mm and 35 mm,exceeded the specifications ofChina’s national MDF product standard GB/T 11718-1999.