Method and coater for coating of a flat substrate

A method for coating a flat substrate by a coater comprising an entry station for receiving the flat substrate to be coated, a control system for controlling print job data, print job settings and coater settings, an application module comprising a supporting roller for supporting the flat substrate and an application roller for transferring a layer of coating from a surface of the application roller towards the flat substrate, an end station for storing the flat substrate when coated, and a first sensor for determining a radius of the application roller,

• wherein the application module is configured to transport the flat substrate from the entry station in-between the supporting roller and the application roller towards the end station, and
• wherein the method comprises the steps of:
• the control system receiving print job data and print job settings;
• the control system determining an impression value of the application roller by means of received print job settings;
• the first sensor determining a radius of the application roller;
• determining an axis location of the application roller having a distance of the radius of the application roller plus a nominal thickness of the flat substrate read from the print job data minus the determined impression value from the supporting roller surface;
• automatically moving the application roller to the determined axis location;
• and
• starting the transport of the flat substrate from the entry station in-between the supporting roller and the application roller towards the end station.