Method to provide an abrasive product surface and abrasive products thereof

1. A flexible abrasive product comprising a surface with multiple abrasive zones supported by a backing layer, the abrasive zones comprising abrasive grains adjoined to a resin, each abrasive zone surrounded by interconnected channel portions with limited linear length having substantially constant transverse dimensions along channel portion lengths, wherein the transverse dimension is width by height, the channel portions comprising different widths such that the channel portions comprise first channel portions with a substantially constant first channel width and second channel portions with a substantially constant second channel width.

2. The abrasive product according to claim 1 , comprising more than two channel portion levels such that each increasing level of channel portions comprises a total volume a least equal to or larger than the previous level.

3. The abrasive product according to claim 1 , wherein each channel portion has a substantially constant width and height along the channel portion length.

4. The abrasive product according to claim 1 , wherein the channel portion length refers to the shortest surface distance between two branching points or intersections of a channel between two abrasive zones.

5. The abrasive product according to claim 1 , wherein the backing layer is extruded, die cast or injection moulded and comprises first channel portions with a first transverse dimension arranged to improve the abrasive product flexibility.

6. The abrasive product according to claim 1 , wherein second channel portions comprise curvature to avoid linear interference stripes on a surface of an object treated with the abrasive product.

7. The abrasive product according to claim 1 , wherein the second channel portions comprise a maximum linear length of less than 2.5 times 8 mm.

8. The abrasive product according to claim 1 , wherein the second channel portions define a network of interconnected channel portions.

9. The abrasive product according to claim 8 , wherein the network of interconnected channel portions defines a repeating pattern.

10. The abrasive product according to claim 1 , wherein the area of an abrasive zone is in the range of 0.5 to 75 mm 2 , and wherein 20% to 50% of the abrasive product surface area is free of abrasive zones to enable formation of a network of channel portions between the abrasive zones.

11. The abrasive product according to claim 1 , wherein the abrasive zones have congruent shapes.

12. The abrasive product according to claim 1 , wherein recessed areas matching the second channel portions are provided on the backing layer.

13. The abrasive product according to claim 12 , wherein the position of the recessed areas on the backing layer substantially coincides with the position of the second channel portions on the abrasive layer to increase the volume of the second channel portions.

14. An apparatus comprising an abrasive product according to claim 1 .

15. A method to obtain a flexible abrasive product, the method comprising

providing a backing layer and

forming multiple abrasive zones supported by the backing layer,

wherein each abrasive zone comprises abrasive grains adjoined to a resin and is surrounded by interconnected channel portions with limited linear length and having substantially constant transverse dimensions along channel portion lengths, wherein the transverse dimension is width by height, the channel portions comprising different widths such that the channel portions comprise first channel portions with a substantially constant first channel width and second channel portions with a substantially constant second channel width.

16. The method according to claim 15 , wherein the backing layer comprises one or more functional layers formed by die casting, extruding, co-extruding or injection moulding.

17. The method according to claim 15 , further comprising increasing the surface tension of the backing layer by a corona, plasma or flame treatment.

18. The method according to claim 15 , further comprising applying a friction coating to a second side of the backing layer.

19. The method according to claim 15 , further comprising providing the backing layer with recessed areas for conveying water or abraded material away.

20. The method according to claim 19 , further comprising arranging the position of the recessed areas on the backing layer such that the recessed areas substantially coincide with the position of the second channel portions to increase the volume of the second channel portions.

21. The method according to claim 15 , further comprising forming openings extending through the backing layer, the openings positioned on recessed areas and comprising an opening width equal to or less than the width of the recessed area and a maximum opening length equal to the maximum length of the second channel portions.

22. The method according to claim 15 , wherein the backing layer comprises a polypropylene homopolymer, a random copolymer of propylene and ethylene or a propylene and an alkene, a block copolymer of propylene and ethylene or alternatively propylene and an alkene.

23. The method according to claim 16 , wherein one or more of the functional layers comprises an adhesion promoting compound selected from the group consisting of high density ethylene copolymer, low density ethylene copolymer, ethylene-butyl acrylate copolymer, ethylene vinyl acetate copolymer, ethylene methyl acrylate copolymer, ethylene butyl acrylate copolymer, 2-ethyl hexyl acrylate copolymer, ethylene acrylic ester terpolymer where the acrylic ester type is a methyl, ethyl or butyl acrylate, ethylene vinyl acetate terpolymer where the acrylic ester type is a methyl, ethyl or butyl acrylate.

24. The method according to claim 15 , further comprising providing the backing layer with elevated areas.

25. The method according to claim 24 , wherein the elevated areas are provided

by calendaring the surface of the backing layer,

by applying an abrasive coating on a backing layer, or

by calendaring the surface of the backing layer and applying an abrasive coating on a calendared backing layer surface.