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Coil coating by Dörken MKS:
A safe, long-term surface protection

Coil coated metal sheets are used in a wide range of industrial segments and applications. The coating effectively protects the surface from corrosion and other external influences over a long period of time.

Coil

With its coil coating products and high-quality coating systems for special applications in the steel segment, Dörken MKS serves a highly specialised niche-market. As a development partner, we offer individual solutions matched to the technological challenge posed. A current example here are our solutions for use in high temperature corrosion protection, which have been awarded, amongst others, with the Effizienz-Preis NRW 2015.

Coil coating – the definition

Coil coating is a continuous process that coats metal sheets such as steel, stainless steel or aluminium on one or both sides using an organic coating material. The metal sheets are coated first and then processed, for example: reshaped, flexed, deep-drawn. Applying the coating material – varnishes or foils – ensures that the metal sheets are not only aesthetic and functional, but thoroughly protected against surface damages and corrosion at the same time. The result is a high-performance composite consisting of a metal carrier and an organic coating.

Efficient production process

The fully automated coil coating process is a continuous process that usually involves multiple steps. It is much more efficient than coating per piece and free of disruptions. To start with, the coiled steel, stainless steel or aluminium substrate to be coated is delivered to the coating unit, where it is positioned at the beginning of the coating line before being unwound. Any fat or oil residue on the surface of the sheet is then removed prior to chemical pre-treatment. An individualised rolling process applies the coating in the thickness required for the sheet’s later use. In most cases, the coating involves a base coat, which is applied first and cured at around 220-240°C, followed by a top coat (the second layer). The metal sheets are then dried in a special oven and finally allowed to cool. If necessary, they can be further laminated using a protective plastic foil before being re-coiled.

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