Process for manufacturing a coated metal strip of improved appearance

Patent metadata

Field	Value
Publication number	US-11098396-B2
Application number	US-202016856232-A
Country	US
Kind code	B2
Filing date	Apr 23, 2020
Priority date	May 14, 2009
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

An installation for continuous hot-dip coating of a metal strip is provided. The installation includes a tank containing a bath of molten metal, a metal strip running through the bath and a confined wiping device. The confined wiping device includes at least two wiping nozzles placed on each side of a path of the strip after the strip has left the bath of molten metal. Each nozzle has at least one gas outlet orifice and an upper face. The confined wiping device also includes a confinement box adjacent each upper face. The confinement boxes are open on a face which faces the strip. Each box includes at least one upper part and two lateral parts.

First claim

What is claimed is:

1. An installation for the continuous hot-dip coating of metal strip, comprising:
a tank containing a bath of molten metal;
a metal strip running through the bath; and
a confined wiping device comprising:
a respective wiping nozzle placed on each side of a path of the strip after the strip has left the bath of molten metal, each wiping nozzle having at least one gas outlet orifice and an upper face; and
a respective confinement box located adjacent the upper face of each wiping nozzle, wherein the confinement boxes open on a face which faces the strip, each confinement box including an upper part including a vertical plate and a horizontal plate, each confinement box further including two lateral parts, wherein each confinement box further includes a plurality of vertical blades extending from the upper face of the adjacent wiping nozzle up to the upper part of said each confinement box, said plurality of vertical blades located between the two lateral parts of said each confinement box,
wherein the confined wiping devices further include anti-noise plates on each side of the strip, facing part of the outlet orifice of the wiping nozzles,
wherein the confinement boxes further include edge confinement pieces placed between the confinement boxes above the anti-noise plates, facing edges of the strip,
wherein each of the edge confinement pieces includes two rectangular plates inclined to a plane in which the strip runs and joined together along a vertical edge, the vertical edges placed facing the edges of the strip, and
wherein the edge confinement pieces further include a return device connecting the rectangular plates, the rectangular plates being sufficiently inclined to the plane in which the strip runs in order to be in contact with the lateral parts of the confinement boxes.

2. The installation as recited in claim 1 , further comprising edge confinement pieces placed between the confinement boxes, facing the edges of the strip and extending so as to face part of the outlet orifice of the wiping nozzles.

3. The installation as recited in claim 1 , wherein the wiping nozzles include a single outlet orifice in a form of a longitudinal slot with a width at least equal to that of the strip to be coated.

4. The installation as recited in claim 1 , wherein, in each confinement box, a width of the horizontal plate is equal to a width of each lateral part.

5. The installation as recited in claim 4 , wherein the width of the horizontal plate and the width of each lateral part is less than or equal to a depth of the wiping nozzles.

6. The installation as recited in claim 1 , wherein each of the wiping nozzles has a triangular general shape defined by two longitudinal plates fixed together by two triangular end plates.

7. The installation as recited in claim 1 , wherein a distance D between an end of the lateral parts of the confinement boxes and the strip is from 10 to 100 mm.

8. The installation as recited in claim 1 , wherein a height H of the confinement boxes in relation to a wiping line is greater than or equal to 10 cm.

Assignees

• Arcelormittal

Inventors

• Diez Luc
• Mataigne Jean-Michel
• Orsal Bertrand
• Saint Raymond Hubert

Classifications

• C23C2/20 Primary

  Strips; Plates · CPC title

• C23C2/16

  using fluids under pressure, e.g. air knives · CPC title

• C23C2/06

  Zinc or cadmium or alloys based thereon · CPC title