| 摘要 |
The invention concerns a device (1) for depositing a coating on a surface of a thermoplastic container (10) using a low pressure plasma derived from a precursor gas excited by UHF electromagnetic waves in a circular vacuum cavity housing the container, said device comprising a UHF generator (3) connected through a waveguide (4) to a window (5) of the side wall of the cavity enclosing a UHF wave-transparent envelope (6) and arranged coaxially to a central field, two outer trays (14, 15) respectively upper and lower with adjustable vertical positioning for adjusting the return field impedance, and respective columns (16, 17) for adjustable support of both trays; at least one support column (16) of the upper tray (14) made of a UHF wave-transparent material. |
