Patent ID: 9737909
Date: 2017-08-22
CPC Classifications: B05D,C23C

Claim:
1. A machine for treating containers by plasma, comprising: an enclosure suitable for receiving a container to be treated, a cover defining a nozzle in an extension of the enclosure where the container is held rigidly sealed to the cover during plasma treatment, in order to prevent any communication between the nozzle and the enclosure, whereby communication between an interior of the container and an exterior of the container is prevented; a duct for the depressurization of the container, having a terminal end disposed in the cover so as to connect said nozzle to a vacuum source; a first valve having a closed position in which the first valve closes off the depressurization duct, and an open position in which first valve brings the nozzle and the vacuum source into communication; a duct for the pressurization of the container, distinct from the depressurization duct, having a terminal end disposed in the cover so as to connect the nozzle to a pressure source, the terminal end of the depressurization duct being disposed in a portion of the cover between the terminal end of the pressurization duct and the container, so that gas that surges between the depressurization duct and the container does not flow by the terminal end of the pressurization duct; a second valve having a closed position in which it closes off the pressurization duct, and an open position in which it places the nozzle in communication with the pressure source, so that gas which passes through the second valve flows only out through the terminal end of the pressurization duct; an intermediate chamber formed within a wall of the cover; and a partition wall having holes and disposed between the intermediate chamber and the nozzle, wherein the terminal end of the depressurization duct opens into the intermediate chamber and communicates with the nozzle via the partition wall, wherein the nozzle has a central portion and a terminal portion disposed above the central portion, so that the terminal end of the pressurization duct is connected to the terminal portion, wherein the central portion is formed by a bore that forms a post discharge zone and the terminal portion comprises an annular chamber connected to the bore of the central portion by oblique holes.