Device and method for deaerating a flattened tubular film

A device for production of a tubular film in a blown film method with a blown film line, the device comprising a lay-flat device and a take-off device with a pair of take-off rolls in which the tubular film can be flattened, and at least one deaerating device configured for deaerating a flattened tubular film,

• wherein the at least one deaerating device comprises a movement device for a cutting device with cutting elements, arranged downstream of the pair of take-off rolls in a transport direction of the flattened tubular film, so that the flattened tubular film can be slit through both layers of the flattened tubular film and deaerated by the deaerating device, and
• wherein the movement device is movable by at least one actuator so that the cutting device is movable between a parking position in a frame of the take-off device and a base position in front of the flattened tubular film.