| 摘要 |
The device has sealing bars (9,10,11,12), which are located on the same level as a film draw-off belt (4), and are of the same length of the belt. The sides of the bars acting with the belt, and positioned opposite to the forming tube (3), have two U-shaped anvils (13). These are pushed from above over the belt and guide the film between themselves and the tube, at a small distance to the tube, to force a folded edge (15). The sealing bars move on parallel guides (17,18,19,20), and are moved between an open and a closed operational position, in which they engage on an anvil. |
