Patent ID: 7130178
Filing Date: 2006-10-31
Classification: B05B,G03G

Abstract:
1. A corona charging device comprising: a powder feed having an outlet; an internal charging cavity having an inlet and a charged powder outlet, the powder feed outlet being positioned at the internal charging cavity inlet, the device being adapted to guide a powder stream downstream from the powder feed outlet to the charged powder outlet; a corona charger comprising at least one needle projection, the at least one needle projection having a tip positioned and adapted to facilitate a corona ion flow from the needle projection and intersecting the powder stream, the corona charger optionally comprising a staggered array of three or more needle projections, each needle projection each having a tip positioned and adapted to facilitate a corona ion flow from the needle projection and intersecting the powder stream; a ground electrode adapted to be charged or grounded to attract the corona flow from the needle projection, which can be a rotating ground electrode adapted to rotate segments of the ground electrode between the internal charging cavity; and one or more of: