Process for fabricating processed wood material panels

Process of fabricating processed wood material panels, such as chip boards, fiber boards, OSB panels, MDF panels, and the like with processed wood material bonded together with a duroplastic binder, in which the curing of the panel is accelerated by a hardener, the process including the steps of spreading processed wood material particles and binder in the form of a fleece on a conveyor, transporting the fleece on the conveyor to a continuously operating double-band press, compacting the fleece in the double-band press and in the compacting step reducing the fleece thickness from an original thickness to a final thickness, and then pressing the final thickness of the fleece with an applied pressure, and introducing hardener into the fleece, wherein the improvement comprises the steps of introducing the binder free of hardener into the material particles, encapsulating an acid or basic hardener in a gaseous phase or a binary phase with a gaseous carrier agent in microcapsules having an enclosing wall with the enclosing wall being inert relative to the binder, introducing the hardener containing microcapsules into the wood material particles and binder during the period covering when the wood particle material and binder is spread to form the fleece and up to the commencement of the reduction of the thickness of the fleece from the original thickness, transporting the fleece after the introduction of the hardener to a wedge-shaped inlet of the double-band press, compacting the fleece in the wedge-shaped inlet from the original thickness to the final thickness, and destroying the enclosing wall of the microcapsules during the compacting step and releasing the hardener into the fleece for commencing the hardening action and after passage of the fleece through the wedge shaped inlet, pressing the fleece in an average pressure reaction zone followed by a low pressure shape maintenance zone within the double-band press.