Principles of Aluminum Coil Coating

The production of aluminum coil color coating is carried out by a precision roller coating machine, which evenly applies the same thickness of coating on the surface of the pre treated aluminum coil, enters the oven with exhaust device at a constant speed, and uses infrared, NIA (near infrared) or hot air circulation baking processes for curing. At a specific temperature, cross-link to form a film and obtain a complete coating with a certain thickness.

Typical coated aluminum roller coating production line

Development direction of coated aluminum roller coating

In terms of pre-treatment, for conventional spray pre-treatment systems, efforts should be made to use more automatic control devices to improve efficiency and save reagents by monitoring the treatment solution. In terms of coatings, efforts will be made to strengthen the research on fast drying water-soluble coatings to reduce the use of diluent solvents and meet the requirements of high-speed units. Simultaneously developing high-performance coatings to improve the density, processability, and corrosion resistance of the coating film. High efficiency refers to the use of less paint, lower baking temperature, and shorter baking time while ensuring quality.

Faced with the choice and combination of traditional conversion treatment methods and on-site drying without rinsing methods in the process route. Research is also underway on low-cost pre-treatment automatic monitoring devices. In terms of baking methods, NIR near-infrared baking technology has been widely adopted abroad, saving energy by 17% to 25%.