METHOD FOR PRODUCING A PANEL FROM SECONDARY RAW MATERIALS, PANEL FORMED FROM SECONDARY RAW MATERIALS, AND PANEL FORMED FROM SECONDARY RAW MATERIALS PRODUCED BY THIS METHOD

摘要

The invention relates to a method for producing a panel (20) from secondary raw materials, in particular from a ground material consisting of comminuted and ground polyurethane foam residues and optionally further solid auxiliaries. To perform the method, a mixture of ground material, isocyanate, water and optionally further liquid or pourable additives is pressed under high pressure and elevated temperature to form a panel. The mixture is continuously fed here in the form of a bulk material, uniformly distributed in width and thickness, to a press nip of a double-belt press (10) formed of endless belts running in parallel. As it passes through the double-belt press (10) the fed bulk material is subjected to a defined pressure perpendicular to the parallel endless belts and to an elevated temperature so as to form a hot endless panel at the discharge from the double-belt press (10). To protect the metallic surfaces of the endless belts from sticking, a separation layer is introduced during the pressing process of the double-belt press (10) between the metallic surfaces of the endless belts and the bulk material.