# US 2014/0193588 A1 · Device for producing coated steel sheet and method for producing coated steel sheet

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- Number: US 2014/0193588 A1
- Document ID: US20140193588A1
- Status: Published application
- Kind: A1
- Application number: 14/238,535
- Filed: 2012-03-14
- Published: 2014-07-10
- Earliest claimed: 2012-03-14
- Assignees: Nippon Steel & Sumitomo Metal Corporation
- Inventors: Katsuhide Soya; Masayoshi Nagatomi; Fumio Shibao; Hiroyasu Furukawa
- Web page: https://patentgrep.com/patent/US20140193588A1

## CPC

- B05D 7/14: to metal, e.g. car bodies (involving a chemical reaction between the metal and the coating C23)
- B05C 5/005: {Curtain coaters (B05C5/008 takes precedence)}
- B05C 11/06: with a blast of gas or vapour
- B05C 11/1039: {Recovery of excess liquid or other fluent material; Controlling means therefor}
- B05D 1/305: {Curtain coating}
- B05D 3/042: {Directing or stopping the fluid to be coated with air}
- B05D 3/12: by mechanical means
- B05D 2202/15: Stainless steel
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- 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)

## Abstract

A device for producing a coated steel sheet includes: a blowing-off unit which sprays a gas onto and remove an excessive coating that accumulates along a side edge of a steel sheet that threads along one direction; and a coating-collection unit which collects the excessive coating removed by the blowing-off unit. The blowing-off unit includes a spray nozzle and a gas supply member. The coating-collection unit includes a duct and a coating container. In a case where the duct is seen in a plan view, an outlet thereof is disposed to fit in and overlap an inside of an opening of the coating container, and in a case where the duct is seen in a side view, a gap is provided between the outlet and the opening of the coating container.

## Claims

### Claim 1

A device for producing a coated steel sheet, comprising:
a blowing-off unit which sprays a gas onto and remove an excessive coating that accumulates along a side edge of a steel sheet that threads along one direction; and
a coating-collection unit which collects the excessive coating removed by the blowing-off unit,
wherein the blowing-off unit includes a spray nozzle which is directed in a direction from an inside to an outside in a sheet-width direction of the steel sheet and directed toward the side edge, and a gas supply member which supplies the gas to the spray nozzle,
the coating-collection unit includes a duct having an inlet that receives the excessive coating and an outlet that discharges the received excessive coating, and a coating container having an opening that receives the excessive coating discharged from the outlet, and
in a case where the duct is seen in a plan view, the outlet is disposed to fit in and overlap an inside of the opening of the coating container, and in a case where the duct is seen in a side view, a gap is provided between the outlet and the opening of the coating container, and
when an angle between an extension line of a center axis line of the spray nozzle and a projection line of the extension line on a surface of the steel sheet is defined as β, an angle between the projection line and a sheet threading direction of the steel sheet in a case where the surface is seen in a facing view is defined as α, and a distance from a tip end of the spray nozzle to a point that intersects a plane including the surface when seen along with the extension line is defined as d in units of mm, all the following Expressions 1, 2, and 3 are satisfied, and a discharge direction of the spray nozzle is disposed to be opposite to the sheet threading direction of the steel sheet,
30°<α<60° (Expression 1)
30°<β<60° (Expression 2)
10 mm<d<55 mm (Expression 3).

### Claim 2

(canceled)

### Claim 3 (depends on 1)

The device for producing a coated steel sheet according to claim 1, wherein a size of the gap in a side view is 60 mm or more and 100 mm or less.

### Claim 4 (depends on 1)

The device for producing a coated steel sheet according to claim 1, wherein a viscosity of the coating applied to the steel sheet is 700 Mpa·sec or higher and 2000 mPa·sec or lower.

### Claim 5 (depends on 1)

The device for producing a coated steel sheet according to claim 1,
wherein the blowing-off unit is adjusted so that a discharge flow rate of the gas discharged from the spray nozzle is 12 m3/h or more and 20 m3/h or less, a discharge flow velocity of the gas discharged from the spray nozzle at a position of 5 mm from a tip end of the spray nozzle in a discharge direction when seen along an extension line of a center axis line of the spray nozzle is 420 m/s or more and 520 m/s or less, and a discharge flow velocity of the gas discharged from the spray nozzle at a position of 5 mm from a point where the extension line intersects a plane including a surface of the steel sheet toward the spray nozzle when seen along the extension line of the center axis line of the spray nozzle is 130 m/s or more and 520 m/s or less.

### Claim 6 (depends on 1)

The device for producing a coated steel sheet according to claim 1,
wherein the inlet of the duct is provided with an extension member which receives the excessive coating directed to an outside of the inlet.

### Claim 7 (depends on 1)

The device for producing a coated steel sheet according to claim 1,
wherein the spray nozzle is disposed so that the discharge direction of the gas is along with the sheet threading direction when seen in the plan view.

### Claim 8 (depends on 1)

The device for producing a coated steel sheet according to claim 1,
wherein the spray nozzle is disposed so as to further satisfy the following Expression 4,
0.1≦sinα·cosβ≦0.9 (Expression 4).

### Claim 9 (depends on 1)

The device for producing a coated steel sheet according to claim 1, wherein a shape of a discharge port of the spray nozzle in a facing view is any of a rectangle, a circle, an ellipse, and a flat shape.

### Claim 10

A method for producing a coated steel sheet, the method comprising:
blowing off and removing an excessive coating that accumulates along a side edge of a steel sheet on which a coating is applied by a spray nozzle which is directed in a direction from an inside to an outside in a sheet-width direction of the steel sheet and directed toward the side edge; and
receiving and collecting the removed excessive coating by a coating container via a duct having an inlet and an outlet,
wherein an internal pressure of the duct is released from a gap between the outlet of the duct and an opening of the coating container, and
when it is assumed that an angle between an extension line of a center axis line of the spray nozzle and a projection line of the extension line on a surface of the steel sheet is β, an angle between the projection line and a sheet threading direction of the steel sheet in a case where the surface is seen in a facing view is α, and a distance from a tip end of the spray nozzle to a point that intersects a plane including the surface when seen along the extension line is d in units of mm, all the following Expressions 4, 5, and 6 are satisfied, and a discharge direction of the spray nozzle is disposed to be opposite to the sheet threading direction of the sheet,
30°<α<60° (Expression 4)
30°<β<60° (Expression 5)
10 mm<d<55 mm (Expression 6).

### Claim 11 (depends on 10)

The method for producing a coated steel sheet according to claim 10, wherein a viscosity of the coating applied to the steel sheet is 700 Mpa·sec or higher and 2000 Mpa·sec or lower.

### Claim 12 (depends on 3)

The device for producing a coated steel sheet according to claim 3, wherein a viscosity of the coating applied to the steel sheet is 700 Mpa·sec or higher and 2000 Mpa·sec or lower.

### Claim 13 (depends on 3)

The device for producing a coated steel sheet according to claim 3, wherein the blowing-off unit is adjusted so that a discharge flow rate of the gas discharged from the spray nozzle is 12 m3/h or more and 20 m3/h or less, a discharge flow velocity of the gas discharged from the spray nozzle at a position of 5 mm from a tip end of the spray nozzle in a discharge direction when seen along an extension line of a center axis line of the spray nozzle is 420 m/s or more and 520 m/s or less, and a discharge flow velocity of the gas discharged from the spray nozzle at a position of 5 mm from a point where the extension line intersects a plane including a surface of the steel sheet toward the spray nozzle when seen along the extension line of the center axis line of the spray nozzle is 130 m/s or more and 520 m/s or less.

### Claim 14 (depends on 4)

The device for producing a coated steel sheet according to claim 4, wherein the blowing-off unit is adjusted so that a discharge flow rate of the gas discharged from the spray nozzle is 12 m3/h or more and 20 m3/h or less, a discharge flow velocity of the gas discharged from the spray nozzle at a position of 5 mm from a tip end of the spray nozzle in a discharge direction when seen along an extension line of a center axis line of the spray nozzle is 420 m/s or more and 520 m/s or less, and a discharge flow velocity of the gas discharged from the spray nozzle at a position of 5 mm from a point where the extension line intersects a plane including a surface of the steel sheet toward the spray nozzle when seen along the extension line of the center axis line of the spray nozzle is 130 m/s or more and 520 m/s or less.

### Claim 15 (depends on 3)

The device for producing a coated steel sheet according to claim 3, wherein the inlet of the duct is provided with an extension member which receives the excessive coating directed to an outside of the inlet.

### Claim 16 (depends on 4)

The device for producing a coated steel sheet according to claim 4, wherein the inlet of the duct is provided with an extension member which receives the excessive coating directed to an outside of the inlet.

### Claim 17 (depends on 5)

The device for producing a coated steel sheet according to claim 5, wherein the inlet of the duct is provided with an extension member which receives the excessive coating directed to an outside of the inlet.

### Claim 18 (depends on 3)

The device for producing a coated steel sheet according to claim 3, wherein the spray nozzle is disposed so that the discharge direction of the gas is along with the sheet threading direction when seen in the plan view.

### Claim 19 (depends on 4)

The device for producing a coated steel sheet according to claim 4, wherein the spray nozzle is disposed so that the discharge direction of the gas is along with the sheet threading direction when seen in the plan view.

### Claim 20 (depends on 5)

The device for producing a coated steel sheet according to claim 5, wherein the spray nozzle is disposed so that the discharge direction of the gas is along with the sheet threading direction when seen in the plan view.