Patent ID: 7678430
Filing Date: 2010-03-16
Classification: C23C,H01J,H05H

Abstract:
1. A method for depositing a coating on one face of several containers made of a thermoplastic using a low-pressure plasma by excitation of a precursor gas by UHF electromagnetic waves in only one circular vacuum chamber containing said containers, said UHF electromagnetic waves being supplied through a window of a side wall of said only one circular vacuum chamber, wherein a frequency of the UHF electromagnetic waves is selected and said only one circular vacuum chamber is sized such that a coupling mode is generated which generates a number of electromagnetic fields inside the only one circular vacuum chamber, and wherein a same number of containers are disposable inside said only one circular vacuum chamber, said-containers being disposable coaxially and respectively within one of said number of electromagnetic fields, whereby it is possible for several respective containers to be simultaneously treated in the only one circular vacuum chamber and wherein the UHF electromagnetic waves have a frequency f=2.455 GHz, and wherein the diameter of said chamber is 273 mm to establish a TM120 coupling mode that generates two central fields in the only one circular vacuum chamber, whereby it is possible for two containers to be simultaneously treated inside said chamber.