Device and method for coating of a metallic strip substrate on one side and/or on both sides

A device for coating a metallic strip substrate, comprising:

• a guiding apparatus for guiding the strip substrate during the coating along a predetermined movement path;
• a first coating device for coating a first main side of the strip substrate with electrostatically charged coating powder stored in a fluidized state in a first container, the first container being arranged at least partially geodetically below a first path section of the movement path;
• a second coating device for coating a second main side of the strip substrate with electrostatically charged coating powder stored in a fluidized state in a second container, the second coating device being arranged downstream of the first coating device with respect to a running direction of the strip substrate along the movement path of the first coating device;
• a redirecting unit arranged between the first coating device and the second coating device with respect to the movement path for redirecting the strip substrate,
• wherein the first path section transitions into a second path section of the movement path by means of the redirecting unit,
• wherein the redirecting unit redirects the strip substrate in such a manner that the strip substrate in the second path section runs in the opposite direction to the strip substrate in the first path section, and
• wherein the second container is arranged at least partially geodetically below the second path section;
• a measuring device for contact-free measurement of a coating thickness produced by the first coating device or the second coating device, the measuring device being arranged downstream of the respective coating device;
• a first stabilizing roller arranged upstream of the first coating device;
• a second stabilizing roller arranged upstream of the second coating device;
• and
• a control device connected to the measuring device, which controls at least one of
• an operation of the first coating device,
• an operation of the second coating device,
• a positioning of the first coating device,
• a positioning of the second coating device,
• a positioning of the first stabilizing roller, and
• a positioning of the second stabilizing roller
• as a function of a target coating thickness and measurement data generated by the measuring device.