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.
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.
Coil coating – the advantages at a glance
- Highly automated, safe and continuous process
- Consistent coating thickness and surface quality
- Constant corrosion protection
- Precise configuration of specifications (coating thickness, visual appearance, functional characteristics)
- Long-term protection of up to 40 years
- Flexible manufacturing of different designs
- Solid, consistent coating of the entire substrate
- Wide range of creative possibilities (coloured top coats)
- Uses up to 100% of the material = sustainable process
- High productivity
- Minimal use of material during cleaning, pre-treatment and coating
- Effective use of resources
- High cost-efficiency
- Materials are wholly recyclable
- Low emissions
- Closed waste disposal cycle