Laser cut abrasive article, and methods
Abrasive articles, and methods of making abrasive articles by using a laser to convert (e.g., cut) at least a portion of the abrasive coating to form the abrasive article. The method includes laser propagation impinging on the abrasive back side (opposite the abrasive coating) and progressing through to the abrasive side. Such a process inhibits ridging effects around cut regions (e.g., openings) on the front side.
1. An abrasive article comprising:
(a) a backing having an abrasive coating on a first side of the backing, the abrasive coating comprising abrasive particles less than 40 micrometers; and
(b) greater than about 40 apertures through the backing and the abrasive coating, each aperture having a sidewall; and
wherein the sidewall is fused and a ridge of recast material extends no more than 10 micrometers above the abrasive coating.
2. The abrasive article of claim 1 comprising at least 100 apertures.
3. The abrasive article of claim 1 , comprising a central region having randomly placed apertures and an annular outer region having a plurality of apertures arrayed along a radial arc.
4. The abrasive article of claim 1 , wherein the abrasive coating comprises abrasive particles having a size less than 35 micrometers.
5. The abrasive article of claim 1 wherein the ridge of recast material extends no more than 5 micrometers above the abrasive coating.
6. The abrasive article of claim 1 wherein the fused sidewall is formed by cutting the at least one aperture in the abrasive article by focusing laser energy on the backing, with the laser energy passing through the backing prior to passing through the abrasive coating.
7. The abrasive article of claim 1 wherein a supersize coating is coextensive with the sidewall of the aperture.
8. The abrasive article of claim 7 wherein the supersize coating is applied to the abrasive article after cutting the at least one aperture in the abrasive article by focusing laser energy on the backing, with the laser energy passing through the backing prior to passing through the abrasive coating.