Tempering device and blown film line with a tempering device

A tempering device for tempering of a film tube extruded in a haul-off direction above a frost line, the tempering device comprising:

• several guide segments which are distributed around a longitudinal axis arranged parallel to the haul-off direction of the film tube and form a central guide opening for guiding the film tube along the longitudinal axis, wherein the guide segments are adjustable transversely to the longitudinal axis for adjusting a diameter of the guide opening;
• a guide roller for each guide segment, wherein the guide roller is adjustable together with the guide segment and is configured to guide the extruded film tube;
• and
• a nozzle section associated with the guide roller, which is adjustable together with the guide segment,
• wherein the nozzle section has a blow-out nozzle which is designed to blow out a tempering gas in the direction towards the longitudinal axis, and
• wherein the nozzle section is arranged, relative to the longitudinal axis, in at least partial radial overlap with the guide roller.