| 摘要 |
Packages (2) preferably joined in a belt (1) of weldable thermoplastic material display two opposite walls (5, 6) which are joined to edge portions (10, 11) in the vicinity of the openings of the packages. In accordance with the invention the material is heated to a welding temperature in ribbon-shaped, opposite regions (12, 19) in the vicinity of the openings of the packages during the enclosure of both the regions between two pressing ribbons. The material in the ribbon-shaped regions is pressed together by the pressing ribbons, whereby a ribbon-shaped welded region (120) is formed and the packages sealed. In a central area (121) within the welded region the pressing ribbons displace materials, whereby separation of the edge portions (10, 11) from the sealed packages is obtained or made possible. |
