Device for applying transverse welded seams to thermoplastic tubular films, preferably tubular films with gussets folded inwards at the longitudinal edges, with two interacting welding jaws

摘要

In machines for producing, filling and sealing plastic bags and in machines for producing prefabricated plastic bags, difficulties occur in welding with tubular films gussets folded inwards at the longitudinal edges during the processing due to the double number of layers in the region of the gussets. To obtain the necessary quality of a weld seam, it is necessary to shape the weld jaws, which are pivotable about a common fulcrum, corresponding to the cross-section of the plastic tubular film. The permanently heated welding jaws according to the invention comprise a plurality of partial jaws, preferably four, the distance from the closed partial jaws to the different number of layers of plastic tubular film being adjustable. IMAGE