Wood fibre based panel with a surface layer

1. A method to produce a building panel, the method comprising:

applying a wood fibre powder and a binder on a first side of a wood fibre based core, to obtain a first sub-layer;

applying a first wood veneer, comprising holes through the first wood veneer, on the first sub-layer; and

applying heat and pressure to bond the first wood veneer, the first sub-layer and the wood fibre based core together, thereby material from the first sub-layer is pressed into the holes of the first wood veneer, to form a first surface layer,

wherein the building panel comprises a second surface layer, wherein the second surface layer is on a second side opposite the first side of the wood fibre based core, wherein the second surface layer comprises a second sub-layer of a wood fibre powder and a binder, and a second wood veneer on the second sub-layer, and

the method further comprising, prior to applying heat and pressure to form the first surface layer, pre-pressing the first sublayer, wherein the binder of the first sub-layer is partially cured during the pre-pressing.

2. The method as claimed in claim 1 , further comprising applying a foaming agent in the first sub-layer.

3. The method as claimed in claim 2 , wherein the wood fibre powder comprises lignocellulosic particles or cellulose particles.

4. The method as claimed in claim 1 , further comprising applying different colour pigments, wherein portions of the first sub-layer are visible in the holes of the first veneer, wherein the colour of the visible first sub-layer portion varies along the building panel, or such that the portion of the first sub-layer in the holes forms a pattern.

5. The method as claimed in claim 1 , further comprising applying a protective overlay with wear resistant particles on the first wood veneer.

6. The method as claimed in claim 1 , wherein the first sub-layer comprises colour pigments and/or a colorant.

7. The method as claimed in claim 1 , wherein the first sub-layer comprises wear resistant particles.

8. The method as claimed in claim 1 , further comprising applying a protective overlay with wear resistant particles on the first wood veneer prior to pressing.

9. The method as claimed in claim 1 , further comprising pre-treating the first veneer, prior to applying heat and pressure.

10. The method as claimed in claim 9 , further comprising pre-treating the first veneer, prior to applying heat and pressure, by brushing.

11. The method as claimed in claim 1 , wherein after applying pressure, the first wood veneer comprises embossed portions, and wherein a part of the first sub-layer is more compressed under an embossed surface portion than under a non-embossed surface portion.

12. The method as claimed in claim 1 , wherein the first surface layer comprises embossed portions and protrusions, wherein the binder of the first sub-layer bonds porous portions of the first wood veneer in a compressed position to form the embossed portions, and wherein the binder does not bond non-porous portions of the first wood veneer in the compressed position so that non-porous portions of the first wood veneer form the protrusions.

13. The method as claimed in claim 1 , the method further comprising applying a protective overlay with wear resistant particles on the first wood veneer prior to pressing,

wherein the first sub-layer comprises wear resistant particles, wherein the panel comprises, after pressing, the first surface layer with surface portions comprising material from the first sub-layer, wherein the surface portions comprising material from the first sub-layer are flush with a remainder of the first surface layer, to obtain an entire surface layer with wear resistant particles.