WOODY FIBERBOARD AND ITS PRODUCING METHOD

摘要

PROBLEM TO BE SOLVED: To produce a lightweight woody fiberboard having high hardness and high strength irrespective of superior heat resistance with good productivity by a wet sheet-forming method. SOLUTION: The woody fiberboard is obtained by loading water with a bonding agent comprising of woody fibers as a main constituent and containing at least isocyanate groups and carrying out sheet forming of the resultant slurry into a wet mat, and thermally pressure-bonding the wet mat with a thermal press up to the state that the bonding agents on the front and rear layers turn semi-cured to keep the woody fiber on the front and rear layers from being sprung back. Then, the wet mat is pressure released to cause the woody fiber in the core layer of the wet mat to be sprung back, and then heated with hot air to completely cure the bonding agent. Thereby, a woody fiberboard is obtained of an entire density of 0.5 to 0.7 g/cm3, a density of the front and rear layers of 0.6 to 0.9 g/cm3and a density of the core layer of 0.4 to 0.65 g/cm3. COPYRIGHT: (C)2009,JPO&INPIT