Coil-coated steel is used in a wide range of sectors and fields of application. Coating ensures long-term, effective protection of surfaces against corrosion and other influences.
DÖRKEN serves a specialist niche market with coil coating products as well as supplying high-quality coating systems for special applications in the steel field. As a development partner, we offer individual solutions tailored optimally to the respective technical requirements.
Coil coating is a continuous process for the coating of one or both sides of rolled coils of refined steel, stainless steel or aluminium with an organic coating material. In contrast to other coating processes, the coils are first coated and then processed (e.g. formed, bent, drawn). Depending on requirements, the application of the coating material – typically lacquers and plastic films – lends the coils decorative and functional characteristics as well as surface and corrosion protection. The result is a high-performance composite of a metallic base material and an organic coating.
The fully-automated coil coating process typically has multiple steps, runs continuously and - compared to the coating of individual pieces - is considerably more efficient and less prone to interruptions.
|The substrate of steel, stainless steel or aluminium that is destined for coating is supplied to the coating plant in coiled form, uncoiled and guided through a looper. In the first stage the coils are cleaned of oil and grease and chemically pre-treated.
|The actual coating occurs in a roller process, it is precisely tailored to the respective area of use of the coil and can occur in various forms. For example, a base coat (primer) is first applied and annealed, with a topcoat added in a second step.
|After coating the coil is dried in a special oven and subsequently cooled. If necessary, an additional lamination stage can add a protective plastic film.
|In the last stage the coated coil is rolled back up again.