Electrostatic deposition of charged coating particles onto a dielectric substrate

摘要

The present invention provides an apparatus for controlling the spray of positively-charged coating particles towards a grounded or negatively- charged dielectric material having a dielectric constant less than 4.0 and in the form of a hollow container. This apparatus includes: (a) a device for inducing a positive charge onto a coating composition, (b) a device for creating a field of positively-charged coating particles, (c) a device for supporting a series of hollow containers in spaced relation to one another which includes a series of vertically- oriented spindles, (d) a device for transporting the spindles in series through the field of positively-charged coating particles, (e) a gripping chuck made from, or coated with, a dielectric material, or both, mounted to the upper end of a spindle, the chuck having a recess defined therein for receiving the opening of a hollow container, and (f) a grounding device positioned such that, when the dielectric container is in the path of the sprayed, positively-charged coating particles the grounding device is also in the path but shielded therefrom by the dielectric material. The grounding device is insulated from direct electrical contact with the supported container. The grounding device can be replaced by an internal charging device for inducing a negative charge onto a hollow container being supported by the gripping chuck. Moreover, the grounding device or the internal charging device can be used in conjunction with an external charging device for inducing a negative charge onto a hollow container being supported by the gripping chuck.