| 摘要 |
Calibration device 15 for calibrating an extruded film tube 8 above the frost line 14, wherein an annular gap 36 is formed between the calibration device 15 and the film tube 8, comprising a plurality of calibration segments 16 distributed around a longitudinal axis L and forming a central feed through opening 26 for feeding through the film tube 8 along the longitudinal axis L, wherein the calibration segments 16 are adjustable for adjusting the diameter of the feed through opening 26, and at least one blowing nozzle 28 for each calibration segment 16, said at least one blowing nozzle 28 feeds a calibration gas to the feed through opening, that said at least one blowing nozzle 28 is formed such, that the calibration gas is guided to the annular gap 36 substantially parallel to a surface of the film tube and that the calibration gas flows through the annular gap 36 in a single flow direction. |
