Method is for production of floor panels and involves floor panel exposed to an active gas-form material

The method is for the production of a floor panels and involves a floor panel (1) exposed to a gas-form material (2) which is made fluid at room temperature, after being heated by a heating component (3). The gas is pumped into an autoclave (4) by a compressor (5). The exposure of the panel takes place in the autoclave. The laminate floor panel has a one-part substrate (6) and on its upper side (7) a top layer (8) based on two support layers (9) immersed in resin. The floor panel, preferably on all opposing sides, has profiled edge areas (12) which have coupling parts (13), which are of one-part structure with the substrate, mostly formed as a tooth (14) and groove (15) combination. The active material in the autoclave is an acetic acid anhydride, i.e. an acetylate reaction with the wood fibers which comprise the substrate. As a result, the substrate is so modified that at the sides more water-resistant zones (16) are in evidence. Apart from the active material quoted, other substances can be used which can have a favorable influence on the efficiency and/or costs of the process. Catalyzers can be used for the chemical reaction.