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The coil coating process

The metal substrate (steel or aluminium) is delivered in coil form from the rolling mills. Coils weight varies from 5-6 tonnes for Aluminium and up to 20 tonnes for steel.

The coil is positioned at the beginning of the line, and then unwound at a constant speed, passing through the various pre-treatment and coating processes before being recoiled.

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Two strip accumulators found at the beginning and the end of the line enable the work to be continuous, allowing new coils to be added (and finished coils removed) by a metal stitching process without having to slow down or stop the line.

The following steps take place on a modern coating line:

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• Mechanical stitching of the strip to its predecessor
• Cleaning the strip
• Power brushing
• Surface treatment by chemical conversion
• Drying the strip
• Application of primer on one or both sides
• Passage through the first curing oven (between 15 to 60 seconds)
• Cooling down the strip
• Coating the finish on one or both sides
• Passage through the second curing oven (between 15 to 60 seconds)
• Cooling down to room temperature
• Rewinding of the coated coil.