METHOD FOR PRODUCING A MULTILAYER PANEL PROVIDED WITH A WATER IMPERVIOUS COATING

The present invention pertains to a method for producing a multilayer polysaccharide fibre based panel provided with a surface coating that is impervious to water， comprising providing a first polysaccharide fibre based sub-panel having a bottom side and a top side， providing a second polysaccharide fibre based sub-panel which is congruent to the first sub-panel， the second panel having a bottom side and a top side， applying a layer of a hot melt adhesive on the top side of the first sub-panel， stacking the second sub-panel in a spatially aligned relationship on the first sub-panel by lying the bottom side of the second sub-panel on the layer of hot melt adhesive， applying a coating material on the top side of the second sub-panel， leading to an intermediate product comprising the stacked first and second sub-panel with an intermediate layer of the hot melt adhesive and the coating material on its top side， heating the intermediate product such that the hot melt adhesive reaches a temperature above its melting temperature， while applying pressure on the intermediate product， cooling down the intermediate product， thereby forming the multilayer panel with its water impervious coating. The invention also pertains to a multi-layer panel produced when using this method.