| 摘要 |
An apparatus for producing tubular articles, in particular for packaging tubes, from a film tape (48) which consists of weldable plastic and the longitudinal edges of which are thermally joined to one another, has a mould strap (46) which interacts with mould rollers (59, 60) and moulds the film tape (48) around a mandrel (45) to form a tubular article, a lower driven conveyor belt (20), running in the mandrel 45, and an upper driven conveyor belt (33), between which belts the longitudinal edges of the film tape (48) are received, overlapping each other. The upper conveyor belt (20) is designed as an endless belt, running underneath a heating device, a pressing device and a cooling device, and the heating device is designed as an inductively acting high-frequency heater. In a method which can be carried out with this apparatus, to form a weld seam in its longitudinal direction, the film tape (48) is moulded into a tube with an overlap formed by the film edges and the overlap is introduced with its outer tube side and inner tube side into a belt gap (70) formed by the two mutually parallel endlessly circulating and driven conveyor belts (20, 33), is melted therein by the conveyor belts (20, 33), at least until the formation of flowable phases, is compressed with preliminary solidification of the flowable phases, and is subsequently cooled with the application of pressure. <IMAGE> |
