Process for the manufacturing of surface elements with a structured top surface

1. A process for the manufacturing of a decorative surface element, which element comprises a base layer and a decorative upper surface, the decorative upper surface comprises a decor layer and a wear layer, which wear layer is applied on top of the decor layer, wherein lacquer curable by radiation is printed in a predetermined pattern as an uppermost layer on the decorative upper surface, the lacquer curable by radiation covering only parts of the decorative upper surface, leaving a portion of the decorative upper surface uncovered by the lacquer curable by radiation, whereby the lacquer is exposed to radiation whereby it cures whereby a surface structure is achieved.

2. A process according to claim 1 , wherein the lacquer curable by radiation is cured by UV or electron beam radiation and are selected from the group consisting of an acrylic, epoxy and a maleimide lacquer.

3. A process according to claim 1 , wherein the lacquer curable by radiation is applied in several steps with intermediate curing.

4. A process according to claim 1 , wherein the lacquer curable by radiation includes hard particles with an average particle size in the range 50 nm-150 μm.

5. A process according to claim 4 , wherein the hard particles are selected from the group consisting of silicon oxide, a-aluminium oxide or silicon carbide.

6. A process for the manufacturing of a decorative surface element, which element comprises a base layer and a decorative upper surface wherein a lacquer curable by radiation is printed by means of an inkjet printer in a predetermined pattern as an uppermost layer on the decorative upper surface, the lacquer curable by radiation covering only parts of the decorative upper surface whereby the lacquer is exposed to radiation whereby it cures whereby a surface structure is achieved, the lacquer curable by radiation includes hard particles with an average particle size in the range 50 nm-150 μm; and the main part of the hard particles are, optionally, selected from the group consisting of silicon oxide, α-aluminium oxide and silicon carbide while a smaller amount of the hard particles consisting of diamond.

7. A process according to claim 6 , wherein the hard particles consisting of diamond is in the average particle size range 50 nm-2 μm and is placed close to the upper surface of the decorative upper surface.

8. A process for the manufacturing of a decorative surface element, which element comprises a base layer and a decorative upper surface wherein a lacquer curable by radiation is printed by means of an ink-jet printer in a predetermined pattern as an uppermost layer on the decorative upper surface, the lacquer covering only parts of the decorative upper surface whereby the lacquer is exposed to radiation whereby it cures whereby a surface structure is achieved, and the lacquer curable by radiation is applied by means of an ink-jet printer.

9. A process according to claim 8 , wherein the lacquer curable by radiation is translucent.

10. A process according to claim 8 , wherein the lacquer curable by radiation is semi-translucent.

11. A process according to claim 8 , wherein the lacquer curable by radiation includes a matting agent which creates a structure enhancing effect in the structure.

12. A process according to claim 1 , wherein the wear layer comprises lacquer of an acrylic curable by UV or electron beam, the lacquer being an acrylic, epoxy or a maleimide lacquer which is cured before the step where the uppermost, structured layer is applied.

13. A process according to claim 1 , wherein the wear layer comprises hard particles with an average particle size in the range 50 nm-10 μm.

14. A process according to claim 13 , wherein the hard particles are at least one selected from the group consisting of silicon oxide, α-aluminium oxide and silicon carbide.

15. A process according to claim 1 , wherein the decorative upper surface comprises a decor layer, which decor layer originates from a digitally stored original, that the digitally stored original is processed in order to achieve a digital structure original whereby a surface structure that in every essential aspect matches the decor is achieved.

16. A process according to claim 15 , wherein digital structure original is used for guiding the ink-jet printer used for printing the lacquer curable by radiation of the uppermost, structured layer.

17. A process according to claim 1 , wherein,

i) the lacquer curable by radiation is printed in a predetermined pattern on the decorative upper surface, the lacquer curable by radiation covering only parts of the decorative upper surface whereupon,

ii) hard particles with an average particle size in the range 1-150 μm is sprinkled on the still sticky lacquer whereupon,

iii) the lacquer is exposed to radiation so that it cures whereupon,

iv) possible residual particles are removed whereupon,

v) a layer of lacquer curable by UV or electron beam is applied on the decorative upper surface in one or more steps, so that the particles becomes mainly embedded in the lacquer.

18. The process according to claim 6 , wherein the main part of the hard particles are selected from the group consisting of silicon oxide, α-aluminium oxide and silicon carbide.