| 摘要 |
Inflation gas pressure interior of a flexible tubing, such as a food casing, advancing continuously through multiple sequential production and processing zones, is selectably controlled as between two adajacent zones by defining an intermediate zone in the form of an inflated bubble trapped in the tubing between two nip rolls co-acting against a larger smooth surfaced backing roll, through which inflation gas is selectably bled from one zone to the other. |
