Furnish type and mat density effects on temperature and vapor pressure of wood-based panels during hot pressing

Abstract

The goals of this study were to determine the effects of furnish type and mat density on temperature and vapor pressure inside the mat of wood-based panels during hot pressing and to confirm their effects on panel properties. Two furnish types, hinoki strand (HS) and recycled wood particles (RW), were used for experimental panels using urea–formaldehyde resin at five board densities and 15 % mat moisture content. A monitoring device was used to sense the temperature and vapor pressure during hot pressing. The results from this study showed that furnish type and mat density affected temperature and vapor pressure behaviors. The results also showed the effect on panel properties. HS-board had a higher plateau temperature, longer plateau time, and higher vapor pressure than did Mixed- and RW-board. Higher mat density was associated with higher plateau temperature and vapor pressure and longer plateau time and vapor pressure band. Plateau time and temperature were also correlated with vapor pressure. Furthermore, density showed linear relationships with plateau temperature and internal bonding (IB). A linear relationship was also found between plateau temperature and IB, and non-linear relationships were found for vapor pressure with plateau temperature and IB.