| 摘要 |
The method involves withdrawing a film tube (14) from a ring nozzle (12) of a film blowing die (11) and leading away the tube in a withdrawing direction. Two cooling gas streams (KG, KA) from outside are led at the tube in two blowing levels that are spaced from the nozzle. The streams are blown against and in the withdrawing direction, respectively. One of the streams is controlled in its flow rate or temperature over a circumference in sectors. An independent claim is also included for a device for cooling a film tube during manufacturing a tubular film by a blow film extruder. |
