US Patent 7557019 Electromagnetic treatment in atmospheric-plasma coating process

A plasma is produced in a treatment space (58) by diffusing a plasma gas at atmospheric pressure and subjecting it to an electric field created by two metallic electrodes (54,56) separated by a dielectric material (64), and a precursor material is introduced into the treatment space to coat a substrate film or web (14) by vapor deposition or atomized spraying at atmospheric pressure. The deposited precursor exposed to an electromagnetic field (AC, DC, or plasma) and then it is cured by electron-beam, infrared-light, visible-light, or ultraviolet-light radiation, as most appropriate for the particular material being deposited. Additional plasma post-treatment may be used to enhance the properties of the resulting coated products.