Coating module for coating a thin layer of ink on a ribbon

A coating module for variable speed ribbon coating, said coating module comprising:

• a ribbon comprising an inner face and an outer face, said outer face being designed to retain ink on its surface;
• a conveyor system comprising a support element holding and transporting the ribbon on its inner face;
• a squeeze ink roller arranged in contact with the outer face of the ribbon, said squeeze ink roller comprising an outer layer made of elastic material;
• a reservoir assembly designed to hold ink thereon and to feed the squeeze ink roller with said ink, and
• a pressure controller comprising an active element for pressing the ribbon between the squeeze ink roller and the support element along a coating zone,
• wherein an elasticity of the outer layer of a surface of squeeze ink roller and a surface of the support element are designed in such a way that stress applied to the ink along the coating zone in a plane perpendicular to a longitudinal axis of the squeeze ink roller is monotonic on both sides of a global maximum.