Device and method for the continuous heating of a pressed material mat

The invention relates to a device for the continuous heating of a pressed material mat (1)， in particular in the course of the production of wood-based panels， with a continuous furnace (4) which has at least one continuous chamber (5)， in the interior (7) of which the continuous pressed material mat (1) can be acted upon by microwaves， an inlet tunnel (8a) and / or an outlet tunnel (8b) being connected to the flow chamber (5) on the inlet side. This device is characterized by at least one radiation measuring device (10)， which is arranged in or in front of the inlet tunnel (8a) and / or in or behind the outlet tunnel (8b) and with which the intensity of the microwave radiation reaching and / or exiting on the inlet side (8a) of the inlet tunnel (8a) and / or the intensity of the microwave radiation reaching the exit end of the exit tunnel (8b) or exiting the exit tunnel (8b) on the exit side can be measured， and a control or regulating device (9) connected to the radiation measuring device (10)， with which the geometry of the inlet tunnel (8a) and / or the outlet tunnel (8b) can be adjusted via at least one adjusting device (11) as a function of the measured intensity or intensities is.