METHOD AND DEVICE FOR MICROWAVE PLASMA DEPOSITION OF A COATING ON A THERMOPLASTIC CONTAINER SURFACE
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United States of America Patent
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app pub date -
May 19, 2009
filing date -
Nov 28, 2002
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Abandoned
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Abstract
The deposition of a coating on a thermoplastic container surface using low pressure plasma by excitation of a precursor gas with UHF electromagnetic waves in a circular shaped vacuum cavity receiving the container is provided. It includes dimensioning the cavity with respect to the frequency of the UHF electromagnetic waves so as to obtain a coupling mode generating several electromagnetic fields inside the cavity. In particular a TM 120 coupling mode is provided which generates two central fields (4.sub.A, 4.sub.B) inside the cavity, whereby two containers can be simultaneously treated in said cavity.
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