Development of Atmospheric Plasma Jet With Long Flame

In this paper, an atmospheric plasma jet with long flame has been developed. The plasma jet is covered with a cylindrical glass container, where the inner volume is purged by the working gas. The flame of N
₂
plasma jet has been elongated to about 200 mm, while the conventional plasma jet has a flame of only 10-20-mm length. It has been confirmed that the long-flame plasma jet can modify polymer film with a work distance of over 200 mm. This plasma-jet device could be applicable for treating and cleaning objects having deep channels or large structures and could be used in the wider application fields.