Appliance and method for surface treatment of a board shaped material and floorboard

1. A device comprising:

a machining device which removes the top layer of a building panel in order to obtain a machined surface portion, the machined surface portion comprising core material of the building panel;

a container for containing a liquid coating material;

a coating wheel having a main plane and an outer edge wall extending in a direction other than in the main plane such that the outer edge wall faces radially outward from the coating wheel, said coating wheel being arranged so as to obtain the liquid coating material from the container and transfer the liquid coating material via surface tension from the outer edge wall of the coating wheel to the machined surface portion by a rotary motion, to obtain a coating which covers said machined surface portion; and

a positioning device for positioning of the building panel relative to the coating wheel;

wherein the coating wheel is positioned below the machined surface portion.

2. The device of claim 1 , wherein the positioning device comprises chains and bands.

3. The device of claim 1 , wherein the machining device removes an edge portion of the top layer of the building panel such that the machined surface portion is an edge of the sheet-shaped blank.

4. The device of claim 1 , wherein the machining device removes a groove portion of the top layer of the building panel such that the machined surface portion is a groove in the sheet-shaped blank.

5. The device of claim 1 , wherein the machining device is configured to remove a laminate top layer material from an HDF core material.

6. The device of claim 1 , wherein the machining device is configured to remove a plastic, linoleum or rubber top layer material from an HDF core material.

7. The device of claim 1 , wherein the machining device is configured to remove a wood or wood veneer protected with one or more layers of oil or varnish top layer material from a wood or wood fiber core material.

8. The device of claim 1 , wherein the machining device is configured to remove a protecting layer of oil or varnish top layer material from a massive wood core material.

9. The device of claim 1 , wherein the coating wheel is configured to apply a pigmented oil coating material.

10. The device of claim 1 , wherein the coating wheel is configured to apply a liquid coating material comprising pigments, a binder and a viscosity-reducing agent.

11. The device of claim 1 , wherein the coating wheel is configured to apply a liquid coating material comprising organic pigments, vegetable alkyds and mineral oil.

12. The device of claim 1 , wherein the coating wheel is adjustable relative to the building panel at a vertical or horizontal angle.

13. The device of claim 1 , wherein container comprises a first and second container, and wherein the liquid coating material is circulating between the first and second container to obtain a correct amount of liquid coating material in the first container supplied to the coating wheel.

14. The device of claim 1 , wherein a part of the coating wheel is arranged to rotate in the container.

15. The device of claim 1 , wherein the container is positioned below the building panel.

16. The device of claim 1 , wherein the coating wheel has an application surface that transfers the liquid coating material directly onto the machined surface portion, and the application surface of the coating wheel is positioned below the machined surface portion.

17. The device of claim 1 , wherein the entire coating wheel is positioned below the machined surface portion.

18. The device of claim 1 , further comprising an air system arranged downstream of the coating wheel, the air system configured to remove excess liquid coating material from a top surface of the building panel.

19. The device of claim 14 , wherein the container includes the liquid coating material.

20. A device comprising:

a machining device which removes the top layer of a building panel in order to obtain a machined surface portion, the machined surface portion comprising core material of the building panel;

a coating wheel having a main plane and an outer edge wall extending in a direction other than in the main plane such that the outer edge wall faces radially outward from the coating wheel, said coating wheel being arranged so as to transfer a liquid coating material directly from the outer edge wall of the coating wheel to the machined surface portion by a rotary motion, to obtain a coating which covers said machined surface portion; and

a positioning device for positioning of the building panel relative to the coating wheel;

wherein the coating wheel is positioned below the machined surface portion,

further comprising an air system arranged downstream of the coating wheel, the air system configured to remove excess liquid coating material from a top surface of the building panel,

wherein the air system includes a compressed air nozzle disposed proximal to the top surface of the building panel, said compressed air nozzle directing the excess liquid coating applied to the top surface toward the machined surface portion of the building panel,

wherein

when in use, the coating wheel transfers the excess liquid coating to the machined surface portion and to at least part of the top surface of the building panel, and the compressed air nozzle applies air to the top surface so as to move at least the excess liquid coating applied to the top surface in a contactless manner using an air flow, and

when in use, the air nozzle applies air in a direction substantially parallel to the top surface of the building panel and towards the main plane of the coating wheel.

21. The device of claim 1 , wherein the coating wheel is moved vertically and/or horizontally with respect to the building panel as the positioning device moves the building panel past the coating wheel at a feeding speed.