METHOD FOR PRODUCING A COATED METAL STRIP WITH AN IMPROVED APPEARANCE
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United States of America Patent
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N/A
Issued Date -
Mar 1, 2012
app pub date -
May 11, 2010
filing date -
May 14, 2009
priority date (Note) -
Published
status (Latency Note)
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Abstract
The subject of the invention is a process for manufacturing a metal strip having a metal coating for corrosion protection, comprising the steps consisting in:
- making the metal strip pass through a bath of molten metal; thenwiping the coated metal strip by means of nozzles that spray a gas on each side of the strip, said gas having an oxidizing power lower than that of an atmosphere consisting of 4% oxygen by volume and 96% nitrogen by volume; and thenmaking the strip pass through a confinement zone bounded: at the bottom, by the wiping line and the upper faces of the wiping nozzles,at the top, by the upper part of two confinement boxes placed on each side of the strip, just above the nozzles, and having a height of at least 10 cm in relation to the wiping line andon the sides, by the lateral parts of the confinement boxes,the atmosphere in the confinement zone having an oxidizing power lower than that of an atmosphere consisting of 4% oxygen by volume and 96% nitrogen by volume and higher than that of an atmosphere consisting of 0.15% oxygen by volume and 99.85% nitrogen by volume, as well as a coating installation and a confined wiping device (10; 20; 30) for implementing this process.
First Claim
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