Abstract: An apparatus for the production of tubular bodies, in particular for packaging tubes, from a foil strip (48) which comprises weldable plastic material and the longitudinal edges of which are thermally joined together has a shaping belt (46) which co-operates with shaping rollers (59, 60) and which shapes the foil strip (48) around a mandrel (45) to provide a tubular body, a lower driven transportation belt (20) which runs in the mandrel (45) and an upper driven transportation belt (33), the longitudinal edges of the foil strip (48) being accommodated in mutually overlapping relationship between the transportation belts. The upper transportation belt (20) is in the form of an endless belt which passes beneath a heating means, a pressing means and a cooling means and the heating means is in the form of an inductively operative high frequency heating means.