Abstract: The apparatus for the electrical pretreatment of foils to increase the surface tension (surface energy) comprising a roller electrode forming a counter-electrode and over which is passed the foil to be treated, and at least three knife electrodes, which are arranged parallel to one another and at right angles to the direction of movement of the foil. The discharge edges of the knife electrodes have a constant spacing from the roller electrode surface, which leads to a much better treatment result.

Abstract: A device for laminating two different foils in vacuo with the aid of an electrical gas discharge has two separate treatment chambers or areas, in which different vacuo can be set, so that the treatment can be adjusted in accordance with the corresponding foil, i.e. it can be performed in an optimum manner in accordance with the physical and chemical characteristics of the foil. The electrical gas discharge is a plasma discharge, i.e. a low energy gas discharge in vacuo. Advantageously, the electrodes can be operated at different power levels in the individual, separate treatment areas. For adapting the atmosphere in the treatment areas to the foil characteristics, it is also possible to introduce different gases and optionally carry out an additional heat treatment.

Abstract: Apparatus for the treatment of non-conductive foils or the like by subjecting them to a corona discharge of the type including two elongated electrodes with a gap between them and means for passing the foil or other sheeting through the gap has one of its electrodes, which is preferably the positive electrode, in the form of a profiled roller. The profile of the electrode roller comprises a series of ridges with troughs between them extending along the length of the roller parallel to its axis. The second electrode is also preferably in the form of a roller which has a smooth surface and is coated with dielectric material.