Abstract: A method carried out in a facility having an enclosure, a support for the substrate, a counter-electrode, a head provided with an electrode, a device for diffusing an inert gas and device for injecting an active gas mixture towards the support. The method involves continuously introducing bath the inert gas and the active gas mixture towards the support, continuously activating the reactive gas in the electrical discharge and treating the surface of the moving substrate, continuously discharging, via the outlet, the gaseous atmosphere from the inner volume comprising a fraction of the inert gas and the active gas mixture, adjusting the effective cross-section of the outlet and/or adjusting the total flow rate of the inert gas and the active gas mixture, such that the inner volume of each head is at a slight overpressure relative to the inner volume of the enclosure.

Abstract: An installation having a housing, a substrate support (20) received in the housing, diffuser (42) for diffusing an inert gas towards the substrate support, and at least one head (30) defining an inner volume (V) opened opposite to the top, the head being provided with at least two electrodes (8, 8?, 8?) for creating an electric discharge and with an injector (7, 7?, 7?) for injecting a gaseous mixture towards the substrate. The injector has at least one injection tube (7, 7?, 7?) placed between two adjacent electrodes or between one electrode and a peripheral wall, the tube being provided with injection holes facing the substrate support, for injecting the gaseous mixture on the substrate, whereas diffuser is provided inside the head, the injection tube being placed between the substrate support and the diffuser so that, in use, the gaseous mixture is urged against the substrate by the inert gas.

Abstract: This method for surface treatment with a plasma at atmospheric pressure comprises the step of introducing a treatment gas into a treatment reactor (16), in which a surface (14) to be treated is placed between two exciting electrodes (22, 24), and applying a supply voltage to the two electrodes so as to cause the appearance of a discharge (12) in the treatment gas. The supply voltage is an AC voltage whose amplitude and frequency are adapted in order to maintain at least some of the components of the treatment gas in the excited state, and/or the presence of electrons, between two successive half-cycles of the supply voltage.

Abstract: Method for creating an electric discharge in an initial gas which is at atmospheric pressure and lies between two exciting electrodes, comprising applying a supply voltage to the two electrodes which is an AC voltage whose amplitude and frequency are adapted in order to maintain (1) at least a portion of the components of the gas in the excited state, and/or (2) the presence of electrons, between two successive half-cycles of the supply voltage.