Softal Electronic Erik Blumenfeld Gmbh & Co.

Softal Corona & Plasma Gmbh

Frank Forster

Eckhard Prinz

Peter Palm

A method for continuous atmospheric plasma treatment of an electrically insulating workpiece. The workpiece is arranged at a distance beneath at least one high-voltage electrode which extends across a direction of movement. The electrode and the workpiece are set in motion relative to one another. The high voltage being applied to the high-voltage electrode, preferably is in the form of an AC voltage. A first space situated between the high-voltage electrode and the workpiece is filled with a first atmosphere and a second space on the side of the workpiece facing away from the high-voltage electrode is filled with a second atmosphere that is different from the first atmosphere. The second space is adjacent to a back side of the workpiece. The choice of high voltage and of the first and second atmospheres is made in such a way that a plasma discharge is ignited in the second atmosphere.

Method for continuous atmospheric pressure plasma treatment of workpieces

Disclosure of an electrode arrangement () as high voltage electrode for continual plasma treatment or plasma coating of web material with several knife electrodes () arranged at a right angle to any transport direction of the web material and essentially located parallely to each other which is characterized by the fact that the distances (a&#x2212;e) of adjacent knife electrodes () vary. In tests it has turned out that a more uniform coating result or, respectively, treatment result can be achieved with such an electrode arrangement than with comparable arrangements in which the knife electrodes are arranged equidistant. Preferably, the distances (a) between adjacent knife electrodes () are larger at the edges of the electrode arrangement () than the distances (e) between adjacent knife electrodes () in its center.

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Hamburg, Germany

Frank Forster