Tetra Laval Holdings & Finance S.a.

Robert Devidal

Pierre Fayet

Jacques Laurent

The described device is introduced into a plastic container with a narrow opening and serves a plasma enhanced process for treating the inside surface of the container. The device ( ) extends between the container opening and the container bottom along the container axis (X) and comprising a gas feed tube ( ) for feeding a process gas into the container and permanent magnets ( ) for establishing a stationary magnetic field inside the container. The magnets ( ) form a column of superimposed magnets which is arranged inside the gas feed tube ( ). The north and south poles of each magnet are positioned on opposite sides of the container axis (X). The device may also comprise cooling means ( ) for cooling the gas feed tube and the magnets. Preferably the plasma used in the plasma enhanced process is sustained by microwaves or radio frequency waves and the magnets ( ) are preferably designed such that electron-cyclotron-resonance conditions are established in an area distanced from the container inner surface by 0 to 30 mm.

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Pont-en-Royans, France

Robert Devidal