Tetra Pak (suisse) S.a.

Bertrand Roessler

Pierre Fayet

Walter Schwarzenbach

In a process for treating a surface with the aid of a glow discharge plasma sustained in a gas of substantially ambient pressure between two electrodes (') unwanted effects of plasma filaments occurring in such a plasma are prevented by positioning the surface () to be treated in an edge region (&#x2032;) of the plasma. The surface is placed on one side of a plasma space () defined by the electrode faces (&#x2032;) beyond a pair of aligned edges (&#x2032;) of the electrode faces (&#x2032;), at a distance of a few millimeters from these edges (&#x2032;), and facing these edges (&#x2032;). The treatment gas or treatment gas mixture is fed to the plasma space () from a second side opposite the edge region (&#x2032;) in which the surface () to be treated is positioned. During treatment, a substrate () whose one surface () is to be treated is either stationary or is advanced in a direction substantially perpendicular to the electrode faces (&#x2032;).

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Marly, Switzerland

Bertrand Roessler