Abstract: A fast cured lignocellulosic particle board comprises a hot consolidated laminar mat of lignocellulosic particles. The mat has a middle lamina of particles coated with a fast setting, acid catalyzed, phenol aldehyde thermosetting resin, while the two surface laminae comprise particles coated with a relatively slow curing, alkali catalyzed phenol aldehyde thermosetting resin. The middle lamina is fast curing, but potentially adherent to the metal cauls of the hot press in which the board is manufactured. Although the surface laminae are slower curing, they are nonadherent to the cauls. The net result is a non-sticking particle board curable in the press in about one-half the press time conventionally required.

Abstract: An improved method for the manufacture of wood fiberboard according to the wet system with a closed white water system includes the steps of drying the incoming lignocellulose containing material, prior to the dilution step, to a dryness, or solid consistency, which is higher than the dryness of the wet lap or sheet before final drying to produce the fiberboard product. Formaldehyde is added to the resulting white water which is homogenized to atomize occurring precipitations through efficient agitation and dispersion prior to being recirculated for use for diluting the incoming fiber material. Thus, there is obtained an efficient closed white water system which results in a reduction of environmentally harmful discharge of polluted water as well as the production of fiberboard with enhanced appearance.