| 摘要 |
Film blowing systems for producing tubular films have, above the cooling zone, supporting and guide rolls. So that the air does not build up in front of the supporting and guide rolls, the rolls (4, 5) have on their circumference surrounding depressions (6). The depressions may be helical in shape. In particular, the rolls are designed as brushes, the bristles (8) being arranged helically. <IMAGE> |
