Silicon Oxide Permeation Barrier Coating and Plasma Sterilization of PET Bottles and Foils

Authors

  • Michael Deilmann,

    Corresponding author
    1. Institute for Electrical Engineering and Plasma Technology, Ruhr-Universität, Bochum, Universitätsstr. 150, 44801 Bochum, Germany
    • Institute for Electrical Engineering and Plasma Technology, Ruhr-Universität, Bochum, Universitätsstr. 150, 44801 Bochum, Germany.
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  • Helmut Halfmann,

    1. Institute for Electrical Engineering and Plasma Technology, Ruhr-Universität, Bochum, Universitätsstr. 150, 44801 Bochum, Germany
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  • Simon Steves,

    1. Institute for Electrical Engineering and Plasma Technology, Ruhr-Universität, Bochum, Universitätsstr. 150, 44801 Bochum, Germany
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  • Nikita Bibinov,

    1. Institute for Electrical Engineering and Plasma Technology, Ruhr-Universität, Bochum, Universitätsstr. 150, 44801 Bochum, Germany
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  • Peter Awakowicz

    1. Institute for Electrical Engineering and Plasma Technology, Ruhr-Universität, Bochum, Universitätsstr. 150, 44801 Bochum, Germany
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Abstract

The results of silicon oxide permeation barrier coating and plasma sterilization are shown using a low-pressure microwave plasma reactor system based on a Plasmaline antenna developed for the treatment of polyethylene terephthalate bottles and foils. The influence of the coating composition on the barrier properties is analyzed and a good correlation is found. The optimized barrier coatings are analyzed regarding coating defects, which are visualized by means of capacitively coupled oxygen plasma etching of the coated substrates. The capabilities of plasma sterilization are exemplarily demonstrated for spores of Bacillus atrophaeus allowing for a spore reduction according to today's regulations for aseptic food packaging.

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