Effects of Pressing Schedule on Formation of Vertical Density Profile for MDF Panels

摘要

A fundamental understanding of mat consolidation during hot pressing will help to optimize the medium-density fiberboard (MDF) manufacturing process by increasing productivity, improving product quality, and enhancing durability. Effects of panel density, fiber moisture content (MC), and pressing schedule on formation of vertical density profile (VDP) during hot pressing were investigated. Different pressing schedules in which the platens were quickly closed to positions of 160%, 140%, 120%, 100%, and 90% of final target thickness then more slowly brought to final target thickness were found to be the most important parameters that affected mat consolidation process. Results indicated that with careful selection of pressing schedule, MDF manufacturers can produce products with designated performances based on VDPs. Results from this study are also needed for eventual verification of various press modeling programs that were recently developed.