Usinor

Gérard Baravian

Daniel Chaleix

Patrick Choquet

Vincent Puech

Bernard Lacour

An apparatus is provided that performs continuous cleaning of a surface of a grounded material which is coated with an organic substance. The apparatus includes a plurality of electrodes covered with a dielectric and disposed along the surface of the material. The electrodes are connected to a high-voltage generator using a MOS power transistor connected to a step up transformer to convert low-voltage pulses generated from a low-voltage power supply into high-voltage pulses. The apparatus is configured to provide a pulsed electric field wherein the maximum voltage of the positive pulses Uis greater than the arc-striking voltage U, and the maximum absolute value of the voltage of the negative pulses Uis less than the striking voltage U.

Method of cleaning the surface of a material coated with an organic substance and generator and device for carrying out said method

A method for the continuous cleaning of the surface of a material () which is coated with an organic substance. Steps of the method are: introducing the material () into a treatment area which is supplied with a gas stream containing oxygen; earthing the material (); and generating a plasma by imposing an electric field between the surface of the material () and at least one dielectric-covered electrode (), the electric field being pulsed and providing a succession of positive and negative voltage pulses in relation to the material (). Moreover, the maximum voltage of the positive pulses U+ is greater than the arc-striking voltage Ua, and the maximum absolute value of the voltage of the negative pulses U&#x2212; is less than the striking voltage Ua. Also, a generator and a device which are used to carry out this method.

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Limours, France

Gérard Baravian