Abrasive article having a non-uniform distribution of openings

Patent metadata

Field	Value
Publication number	US-9656366-B2
Application number	US-201213731768-A
Country	US
Kind code	B2
Filing date	Dec 31, 2012
Priority date	Dec 31, 2011
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

An abrasive article having a plurality of apertures arranged in a non-uniform distribution pattern, wherein the pattern is spiral or phyllotactic, and in particular those patterns described by the Vogel equation. Also, provided is a back-up pad having a spiral or phyllotactic patterns of air flow paths, such as in the form of open channels. The back-up pad can be specifically adapted to correspond with an abrasive article having a non-uniform distribution pattern. Alternatively, the back-up pad can be used in conjunction with conventional perforated coated abrasives. The abrasive articles having a non-uniform distribution pattern of apertures and the back-up pads can be used together as an abrasive system.

First claim

What is claimed is:

1. An abrasive article comprising:
a coated abrasive having a plurality of apertures arranged in an aperture pattern,
wherein the aperture pattern has a controlled non-uniform distribution,

wherein the aperture pattern is a phyllotactic pattern,
wherein the aperture pattern has a controlled asymmetry, and
wherein the aperture pattern is rotationally asymmetric about the center of the aperture pattern.

2. The abrasive article of claim 1 , wherein the aperture pattern is a spiral phyllotactic pattern.

3. The abrasive article of claim 2 , wherein the aperture pattern has a number of clockwise spirals and a number of counter-clock wise spirals, wherein the number of clockwise spirals and the number of counterclockwise spirals are Fibonacci numbers or multiples of Fibonacci numbers.

4. The abrasive article of claim 3 , wherein the number of clockwise spirals and the number of counterclockwise spirals are in a ratio that converges on the golden ratio.

5. The abrasive article of claim 1 , wherein the aperture pattern is a sunflower pattern.

6. The abrasive article of claim 2 , wherein least about 51% of the aperture pattern is described in polar co-ordinates by the following equation:
φ= n*α, r=c√n   (Eq. 1)

where:
n is the ordering number of an aperture, counting outward from the center of the aperture pattern;
φ is the angle between a reference direction and a position vector of the nth aperture in a polar coordinate system originating at the center of the aperture pattern, such that the divergence angle between the position vectors of any two successive apertures is a constant angle α;
r is the distance from the center of the aperture pattern to the center of the nth aperture; and
c is a constant scaling factor.

7. The abrasive article of claim 6 , wherein the aperture pattern has a divergence angle in polar co-ordinates that ranges from about 100° to about 170°.

8. The abrasive article of claim 6 , wherein the aperture pattern has a divergence angle that is 137.508°.

9. A coated abrasive article comprising:
a backing layer having a first major side and a second major side;
an abrasive layer disposed on the first major side, wherein the abrasive layer comprises a binder and a plurality of abrasive grains; and
a plurality of apertures that perforate the backing layer and the abrasive layer,
wherein the plurality of apertures are arranged in an aperture pattern,
wherein the aperture pattern has a controlled non-uniform distribution and is a phyllotactic pattern,
wherein the aperture pattern has a controlled asymmetry, and
wherein the aperture pattern is rotationally asymmetric about the center of the aperture pattern.

10. A method of making an abrasive article comprising:
disposing an abrasive layer on a backing; and
perforating the abrasive layer and the backing to create a plurality of apertures,
wherein the apertures are arranged in an aperture pattern having a controlled non-uniform distribution that is a phyllotactic pattern,
wherein the aperture pattern has a controlled asymmetry, and
wherein the aperture pattern is rotationally asymmetric about the center of the aperture pattern.

11. An abrasive article comprising:
a coated abrasive having a plurality of apertures arranged in an aperture pattern,
wherein the aperture pattern has a controlled non-uniform distribution, and

wherein the aperture pattern is a phyllotactic pattern.

Assignees

• Seth Anuj
• Dinh-Ngoc Julie M
• Raman Vivek Cheruvari Kottieth
• Krupa Paul A
• Garrah James M
• Saint Gobain Abrasives Inc
• Saint Gobain Abrasifs Sa

Inventors

• Seth Anuj
• Dinh-Ngoc Julie M
• Raman Vivek Cheruvari Kottieth
• Krupa Paul A
• Garrah James M

Classifications

• B24B55/10

  specially designed for portable grinding machines, e.g. hand-guided · CPC title

• C09K3/1436

  Composite particles, e.g. coated particles · CPC title

• B24D11/00 Primary

  Constructional features of flexible abrasive materials; Special features in the manufacture of such materials · CPC title

• B24B55/06

  Dust extraction equipment on grinding or polishing machines (B24B31/12 takes precedence) · CPC title

• B24B37/26 Primary

  characterised by the shape of the lapping pad surface, e.g. grooved · CPC title