Method of providing decorative designs and structural features on an article of footwear

1. A method of providing a feature on a surface of a sole portion of an article of footwear, the method comprising:

positioning a laser proximate the surface of the sole portion;

directing a laser beam from the laser to the surface of the sole portion to mark or engrave at least a portion of the surface of the sole portion: and

moving at least one of the laser and the sole portion to create a pattern comprising a series of distributed structural features comprising at least one of discrete unconnected polyhedronal elements and a conjoined grid of connected polyhedronal elements on the surface of the sole portion, the pattern providing at least one of an aesthetic and a structural feature on the surface of the sole portion, wherein the pattern comprises a first region extending over a first surface portion of the sole portion and a second region extending over a second surface portion of the sole portion, and wherein at least one of a cross-sectional shape, an orientation, a depth, and a density of the structural features differs between the first region and the second region.

2. The method of claim 1 , wherein the surface of the sole portion comprises a sidewall of a midsole of the article of footwear.

3. The method of claim 1 , wherein the laser comprises at least one of a UV laser and a CO 2 laser.

4. The method of claim 1 , wherein marking the surface of the sole portion comprises changing color of at least a portion of the surface of the sole portion without removing material therefrom to provide the aesthetic feature on the surface of the object.

5. The method of claim 4 , wherein the sole portion comprises at least one of an energy-absorbing color-sensitive additive and a coloring agent to achieve a desired external color on the surface of the sole portion when exposed to the laser.

6. The method of claim 1 , further comprising:

applying a masking medium to at least a portion of the surface of the sole portion prior to activation of the laser;

marking or engraving the surface of the sole portion through the masking medium; and

removing the masking medium.

7. The method of claim 1 , further comprising applying a fluid to the surface of the sole portion prior to activation of the laser, the fluid acting to support the marking or engraving of the surface of the object.

8. The method of claim 7 , further comprising repeating the application of fluid to the surface being marked or engraved during marking or engraving.

9. The method of claim 7 , wherein the fluid is an aqueous solution comprising at least one of an additive, a surfactant, and water.

10. The method of claim 1 , wherein the sole portion comprises a single, unitary material and wherein engraving the surface of the sole portion comprises removing material therefrom to one or more predetermined depth to provide at least one of the aesthetic and the structural feature on the surface of the sole portion.

11. The method of claim 10 , wherein the predetermined depth is between about 0 mm to about 15 mm.

12. The method of claim 10 , further comprising:

priming the engraved sole portion;

drying the primed sole portion;

curing the primed sole portion;

applying a coloring agent to at least one engraved portion; and

applying heat to dry the coloring agent on the sole portion.

13. The method of claim 1 , wherein the pattern further comprises a transition region between the first region and the second region, wherein at least one of the cross-sectional shape, the orientation, the depth, and the density of the structural features changes gradually within the transition region.

14. The method of claim 1 , further comprising removing residue from the surface of the sole portion wherein removing residue comprises:

washing residue created during engraving from the sole portion with an aqueous solution; and

drying the surface of the sole portion.

15. A method of producing an aesthetic feature on a surface of a sole portion of an article of footwear, the method comprising:

positioning a UV laser proximate the surface of the sole portion;

directing a laser beam from the laser to the surface of the sole portion to change a color of at least a portion of the surface of the sole portion without removing material therefrom; and

moving at least one of the laser and the sole portion to create a pattern comprising a series of distributed structural features on the surface of the sole portion, the pattern providing an aesthetic feature on the surface of the sole portion, wherein (i) the distributed structural features comprise at least one of discrete unconnected polyhedronal elements and a conjoined grid of connected polyhedronal elements, (ii) the pattern comprises a first region extending over a first surface portion of the sole portion and a second region extending over a second surface portion of the sole portion, and (iii) at least one of a cross-sectional shape, an orientation, a depth, and a density of the structural features differs between the first region and the second region.

16. A method of providing an aesthetic or a structural feature on a surface of a sole portion of an article of footwear, the method comprising:

applying a masking medium to the surface of the sole portion;

positioning a laser proximate the surface of the sole portion;

directing a laser beam from the laser to the surface of the sole portion to remove material and masking medium therefrom to provide a pattern comprising a series of distributed structural features on at least a portion of the surface of the sole portion, wherein (i) the distributed structural features comprise at least one of discrete unconnected polyhedronal elements and a conjoined grid of connected polyhedronal elements, (ii) the pattern comprises a first region extending over a first surface portion of the sole portion and a second region extending over a second surface portion of the sole portion, and (iii) at least one of a cross-sectional shape, an orientation, a depth, and a density of the structural features differs between the first region and the second region; and

removing the masking medium.

17. The method of claim 16 , further comprising applying at least one color to the surface of the sole portion prior to removing the masking medium.

18. The method of claim 17 , wherein applying at least one color comprises:

immersing the sole portion into a primer solution to prime an unmasked portion of the surface of the sole portion;

drying the primed sole portion;

curing the primed sole portion;

applying a coloring agent to at least a portion of the unmasked portion of the surface of the sole portion; and

drying the coloring agent on the sole portion.

19. The method of claim 18 , wherein the primer solution comprises an ultra-violet primer.