| 摘要 |
The disclosure relates to an apparatus for coating a container, for instance a plastic bottle, by means of a plasma treatment, the apparatus comprising at least one high-frequency source, at least one outer electrode located outside the container to be treated, and at least one at least partially electrically conducting gas lance for the supply of process gas into the container, configured to apply a high frequency of the high frequency source to the at least one outer electrode or the at least one gas lance. The gas lance is configured at least in part or in whole as a hollow cathode having at least one internal hollow space. The hollow space of the hollow cathode is fluidically connected to the interior of the container to be treated and to the part of the gas lance that supplies the process gas, for instance, by lateral and/or axial bores or recesses. A plasma can be generated in the interior of the hollow cathode in the at least one hollow space.
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