# US 9,040,122 B2 · Electrostatic abrasive particle coating apparatus and method

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- Number: US 9,040,122 B2
- Document ID: US9040122B2
- Status: Granted
- Kind: B2
- Application number: 14/289,011
- Filed: 2014-05-28
- Published: 2014-09-18
- Granted: 2015-05-26
- Earliest claimed: 2011-02-16
- Assignees: 3M Innovative Properties Company
- Applicants: 3M Innovative Properties Company
- Inventors: Louis S. Moren; Brian G. Koethe; John T. Boden
- Web page: https://patentgrep.com/patent/US9040122B2

## CPC

- B24D 11/005: {Making abrasive webs}
- B05B 5/057: Arrangements for discharging liquids or other fluent material without using a gun or nozzle
- B05B 5/14: specially adapted for coating continuously moving elongated bodies, e.g. wires, strips, pipes
- B05C 19/04: the particulate material being projected, poured or allowed to flow onto the surface of the work (B05C19/02 takes precedence; involving spraying or electrostatic projection B05B ){(B05C19/005 takes precedence)}
- B05D 1/007: {using an electrostatic field (B05D1/02 - B05D1/16 take precedence)}
- B05D 5/02: to obtain a matt or rough surface
- B24D 18/00: Manufacture of grinding tools {or other grinding devices}, e.g. wheels, not otherwise provided for
- B24D 18/0072: {using adhesives for bonding abrasive particles or grinding elements to a support, e.g. by gluing}
- B05B 5/00: Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
- B24D: TOOLS FOR GRINDING, BUFFING OR SHARPENING (abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls B24B31/14; honing tools B24B33/08; lapping tools B24B37/11)
- B05B: SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F25/72; processes for applying liquids or other fluent materials to surfaces by spraying B05D)
- B05C: APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (spraying apparatus, atomising apparatus, nozzles B05B; plant for applying liquids or other fluent materials to objects by electrostatic spraying B05B5/08)
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)

## Abstract

A method of applying particles to a backing having a make layer on one of the backing's opposed major surfaces. The method including the steps of: supporting the particles on a feeding member having a feeding surface such that the particles settle into one or more layers on the feeding surface; the feeding surface and the backing being arranged in a non-parallel manner; and translating the particles from the feeding surface to the backing and attaching the particles to the make layer by an electrostatic force.

## Claims

### Claim 1

A method of erectly applying abrasive particles to a make layer of a backing comprising:
selecting abrasive particles having an ANSI grit size less than 20 or a FEPA grit size less than P20;
supplying the selected abrasive particles onto a feeding surface;
guiding a backing having a make layer on one of the backings opposed major surfaces along a web path between the feeding surface and a conductive member such that the make layer faces the feeding surface;
creating an electrostatic field between the feeding surface and the conductive member;
translating the selected abrasive particles in a non-vertical direction from the feeding surface onto the make layer to erectly apply the selected abrasive particles to the make layer.

### Claim 2 (depends on 1)

The method of claim 1 wherein the feeding surface in a feeding direction is substantially orthogonal to the backing positioned in a gap between the feeding surface and a conductive member.

### Claim 3 (depends on 2)

The method of claim 2 wherein the feeding surface in the feeding direction is substantially horizontal and the backing is substantially vertical.