Casting unit, unit for producing a film as well as method for producing a film

A unit for producing a film, comprising:

• a casting unit;
• a stretching unit;
• wherein the casting unit comprises a slot die, a chill roll and an air nozzle apparatus;
• wherein the chill roll comprises a circumferential surface and is designed to rotate about an axis so that the circumferential surface moves in a direction of rotation;
• wherein the slot die is configured to generate a melt that contacts the circumferential surface at a line of application,
• wherein the air nozzle apparatus is connected to the slot die so that an intermediate space is delimited by the circumferential surface of the chill roll, the melt, the slot die and the air nozzle apparatus;
• and,
• wherein the air nozzle apparatus is designed to generate an air flow that impinge on the circumferential surface along a line of action counter to the direction of rotation and generates negative pressure in the intermediate space.