Covering panel and process of producing covering panels

1. Process of producing covering panels including floor panels, wall panels or ceiling panels, each covering panel comprising a top layer and at least one substrate, whereby said at least one substrate comprises a synthetic material and a filler material; the method comprising the steps of:

mixing the synthetic material and the filler material, thereby obtaining a mixture;

extruding said mixture, thereby obtaining the substrate;

optionally, laminating the substrate to the top layer;

thereby obtaining the covering panel;

annealing the covering panel,

wherein said filler material is mixed with said synthetic material in an amount from 15 to 75 wt. % based on a total weight of said mixture and whereby said substrate is attached to said top layer at a temperature higher than a softening point but lower than a melt temperature of a principal polymer comprised in said substrate.

2. Process according to claim 1 , whereby a surface of the extruded substrate is not subjected to a surface modification step prior to further processing.

3. Process according to claim 1 , further comprising the step of printing a design directly on the top surface of the substrate, by digital printing.

4. Process according to claim 1 , wherein said filler material is comprised of a mixture of chalk and talc in a ratio of 50:1 to 1:50, based on wt. %.

5. Process according to claim 1 , wherein said substrate is comprised with a void volume from 10 vol. % to 70 vol. %, determined according to ISO 4590 (2016).

6. Process according to claim 1 , wherein at least one of said top layer or said substrate is substantially free of one or more plasticizers.

7. Process according to claim 1 , whereby said substrate and said top layer are subsequently subjected to a double stack lamination process.

8. Process of producing covering panels including floor panels, wall panels or ceiling panels, each covering panel comprising a top layer and at least one substrate, whereby said at least one substrate comprises a synthetic material and a filler material; the method comprising the steps of:

mixing the synthetic material and the filler material, thereby obtaining a mixture;

extruding said mixture, thereby obtaining the substrate;

optionally, laminating the substrate to the top layer;

thereby obtaining the covering panel;

annealing the covering panel,

wherein said filler material is mixed with said synthetic material in an amount from 15 to 75 wt. % based on a total weight of said mixture and whereby at least a surface of said substrate is reheated before attaching said substrate to said top layer.

9. Process according to claim 8 , whereby said substrate and the top layer are subsequently subjected to a double stack lamination process.

10. Process according to claim 8 , whereby the surface of the extruded substrate is not subjected to a surface modification step prior to further processing.

11. Process according to claim 8 , further comprising the step of printing a design directly on the top surface of the substrate, by digital printing.

12. Process according to claim 8 , wherein said filler material is comprised of a mixture of chalk and talc in a ratio of 50:1 to 1:50, based on wt. %.

13. Process according to claim 8 , wherein said substrate is comprised with a void volume from 10 vol. % to 70 vol. %, determined according to ISO 4590 (2016).

14. Process according to claim 8 , wherein at least one of said top layer or said substrate is substantially free of one or more plasticizers.

15. Process of producing covering panels including floor panels, wall panels or ceiling panels, each covering panel comprising a top layer and at least one substrate, whereby said at least one substrate comprises a synthetic material and a filler material; the method comprising the steps of:

mixing the synthetic material and the filler material, thereby obtaining a mixture;

extruding said mixture, thereby obtaining the substrate;

optionally, laminating said substrate to the top layer;

thereby obtaining the covering panel;

annealing the covering panel,

wherein said filler material is mixed with said synthetic material in an amount from 15 to 75 wt. % based on a total weight of said mixture and wherein the substrate is immediately after extrusion arranged on a fibrous material, and is at least partially pressed through said fibrous material.

16. Process according to claim 15 , whereby said substrate is attached to said top layer at a temperature higher than a softening point but lower than a melt temperature of a principal polymer comprised in said substrate.

17. Process according to claim 15 , whereby at least a surface of said substrate is reheated before attaching said substrate to said top layer.

18. Process according to claim 15 , whereby said substrate and said top layer are subsequently subjected to a double stack lamination process.

19. Process according to claim 15 , further comprising the step of printing a design directly on a top surface of the substrate, by digital printing.

20. Process according to claim 15 , wherein said substrate is comprised with a void volume from 10 vol. % to 70 vol. %, determined according to ISO 4590 (2016).