Patent ID: 7670453
Filing Date: 2010-03-02
Classification: C08J

Abstract:
1. A device for processing the surface of a container, in which the processing is accomplished by a low-pressure plasma, by excitation of a reaction fluid with microwave electromagnetic waves, the device for processing comprising: an enclosure in which the container is placed, the container having an elongated neck portion, the enclosure being made of a conductive material, inside of the enclosure, microwaves are introduced by a coupling device; a tube which surrounds the container to delimit an internal cavity of the enclosure, such that an open space is provided between the enclosure and the tube; a device extending into the enclosure to hold the neck of the container; wherein the enclosure is a cylinder and its central axis is a main axis of the container, such that the coupling device has a wave guide tunnel which is disposed outside of the tube and which extends towards the main axis of the enclosure and which is provided within a window of a wall of the enclosure, said wave guide tunnel projected on a plane tangent to the enclosure and is rectangular in shape, the smaller dimension of the rectangle corresponds to its dimension along the direction of the axis of the enclosure, and wherein the inside diameter of the enclosure is such that the microwaves are propagated into the open space between the enclosure and the tube, before reaching the tube, primarily according to a mode in which an electrical field, resulting from the propagation of the microwaves, has an axial symmetry with respect to the central axis of the enclosure, the device for processing further comprising a first ring-shaped plate and a second ring-shaped plate provided entirely inside the enclosure and formed so as to surround the tube, wherein the first ring-shaped plate is axially offset from the second ring-shaped plate so that the first ring-shaped plate is provided above the window of the wall of the enclosure and the second ring-shaped plate is provided below the window of the wall of the enclosure.