Patent ID: 6220533
Filing Date: 2001-04-24
Classification: B05B

Abstract:
A powder-spraying apparatus comprising:a high-voltage source;an earth electrode;at least one external high-voltage electrode provided for an external powder charging;a plurality of internal high-voltage electrodes, said earth electrode and said plurality of internal high-voltage electrodes being provided for an internal powder charging;a ring formed of high-resistance material and having a circumference, said plurality of internal high-voltage electrodes uniformly distributed about said circumference of said ring, said ring having regions lying between said plurality of internal high-voltage electrodes and said regions having an ohmic resistance in a range of between 10 to 30 M.OMEGA.;connection elements formed of said high-resistance material connecting said high-voltage source to both said at least one external high-voltage electrode and said ring; andsaid high-voltage source providing a first current to said plurality of internal high-voltage electrodes and a second current to said at least one external high-voltage electrode; andsaid connection elements and said ring being provided for setting a desired ratio between the first current and the second current.