Wood fibre based panels with a thin surface layer

A method of manufacturing a floor board comprising a wood fibre based core, a thin surface layer and a sub layer between the surface layer and the core, the sub layer comprises wood fibres and a binder, wherein the method comprises the steps of:

• mixing particles comprising wood fibres and an uncured binder for the sub layer;
• applying the wood fibres and the uncured binder in a powder form for the sub layer on the core;
• applying a surface layer on the wood fibres and the uncured binder;
• and
• pressing:
• the core,
• the surface layer, and
• the wood fibres and the uncured binder, in powder form, under increased pressure and temperature with an embossed pressing matrix such that the surface layer obtains upper portions and embossed portions lower than the upper portions, such that the embossed portions extend into the sub layer, and forming them into a floor board by curing the binder.