# US 5,702,578 A · Method of applying a surface coating

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- Number: US 5,702,578 A
- Document ID: US5702578A
- Status: Granted
- Kind: A
- Application number: 08/618,085
- Filed: 1996-03-19
- Granted: 1997-12-30
- Earliest claimed: 1992-07-06
- Assignees: Mazda Motor Corporation
- Inventors: Hironori Umeda; Tohru Mashimo; Kazuo Hironaka; Tadamitsu Nakahama; Takakazu Yamane; Makoto Aizawa; Yukifumi Taniguchi
- Web page: https://patentgrep.com/patent/US5702578A

## CPC

- B05D 7/532: {the two layers being cured or baked together, i.e. wet on wet}
- B05B 13/0442: {Installation or apparatus for applying liquid or other fluent material to separate articles rotated during spraying operation}
- B05B 13/0452: {the objects being vehicle components, e.g. vehicle bodies}
- B05D 1/002: {the substrate being rotated}
- B05D 5/068: {achieved by multilayers (B05D5/066 takes precedence)}
- B05D 7/57: {the last layer being a clear coat}
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- 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)

## Abstract

A surface coating applied to a subject surface includes an undercoating, a color base layer, coated over the undercoating layer, which contains a coloring material, and a color clear layer, coated over the color base layer, which contains a coloring dye of a hue within +/-10 from a hue of the coloring material of the base color layer on the 100-division Mansell hue ring. The color clear layer may be applied with a paint spray device while rotating the subject surface around an axis and continuously moving the subject surface along the axis to form a spiral pattern of paint spray relative to and around the subject surface at regular pitches. Preferably, the ratio of each of the regular pitches to a width of the pattern of paint spray is less than 0.3.

## Claims

### Claim 1

A method of applying a surface coating to a subject surface with a paint spray device which forms a spray pattern of paint having a specified diameter comprising the steps of:
forming an undercoating on the subject surface;
coating an opaque colored base layer over the undercoating; and
coating a transparent layer containing dye coloring on said opaque colored base layer by (1) rotating the subject surface around an axis while continuously moving the subject surface along said axis, (2) operating said paint spray device while continuously moving and rotating the subject surface thereby forming a spiral pattern of paint spray relative to and around said subject surface at regular pitches, (3) keeping a preselected ratio of each of said regular pitches to a width of said pattern of paint spray less than 0.3 and (4) keeping a preselected range of thicknesses of said transparent layer containing dye coloring.

### Claim 2 (depends on 1)

A method as defined in claim 1, wherein said opaque colored base layer and said transparent layer are coated by wet-on-wet coating.

### Claim 3 (depends on 2)

A method as defined in claim 2, and further comprising the step of baking said transparent layer after coating said transparent layer on said opaque colored base layer so as to form an interface between said opaque colored base layer and said transparent layer with a surface roughness of less than approximately +/-2 .mu.m.

### Claim 4 (depends on 1)

A method as defined in claim 1, wherein said undercoating is formed by electrodeposition.

### Claim 5 (depends on 1)

A method as defined in claim 1, wherein said subject surface is a vehicle body surface.

### Claim 6 (depends on 1)

A method as defined in claim 1, and further comprising the step of adjusting the width of the paint spray by changing a distance between said paint spray device and said subject surface.

### Claim 7 (depends on 1)

A method as defined in claim 1, and further comprising the step of controlling said regular pitches by adjusting a speed at which said subject surface rotates around said axis and a speed at which said subject surface moves along said axis.