| 摘要 |
The invention relates to a process for the fine correction of the thickness profile of a blown portion (10) in the production of bubble film in which the flow of cooling air (6) is varied in individual peripheral regions of the film bubble. According to the invention, at least part of the cooling air is taken via an exit slot (20) which is divided into individual separately fed segments in the peripheral direction of the film bubble and the supply of additional cooling air (4) via the exit slot (20) is, for example, controlled per segment using radial blowers (7). In this manner it is possible accurately to regulate the cooling action and thus the film thickness in the individual peripheral regions of the film bubble. |
