Device for producing extrusion-coated laminates

Device for producing extrusion-coated laminates which comprises:

• a substrate film;
• an extruder nozzle with nozzle lip;
• a cooling roller and a contact roller, wherein the cooling roller and the contact roller form a roller gap and the extruder nozzle is directed towards the roller gap and a melt of thermoplastic plastics emerges from the nozzle lip and enters the roller gap while forming a coating film and is joined to the substrate film in the roller gap;
• and a device for promoting adhesion of the coating film to the substrate disposed in the region between the extruder nozzle and the roller gap at a slight distance from the coating film, wherein the device is a corona treatment station which has at least two pin electrodes between which corona discharge burns, including a discharge electrode and a counter-electrode on only one side of the coating film to provide a corona treatment on the coating film, wherein the corona treatment station is disposed between the nozzle lip and the roller gap, with the corona treatment station disposed in the space between the nozzle lip and the narrowest point of the roller gap, such that the corona treatment station lies nearer to the narrowest point of the roller gap than to the nozzle lip, and wherein the melt of thermoplastic plastics is a coating film which has a surface part, and wherein said device provides a corona treatment on said surface part of the coating film while the coating film is at least partly in the molten state to obtain a coating film joined to a substrate film.