DRY POWDER ELECTROSTATIC DEPOSITION METHOD AND APPARATUS

摘要

A method and apparatus are presented for electrostatic deposition of dry powder onto a pharmaceutical tabkets. The apparatus includes a magnetic brush (10) with a rotatable multi-pole magnetic core (22) and a stationary outer shell (24), a developer supply (16), a printhead (160 and 162) on the outer shell and a tablet or other substrate (150). The printhead (160 and 162) includes microchannels (42) for forming a plurality of parallel lines in the channels, a corresponding plurality of transfer electrodes (46) for selectively transferring the powder from the lines to a substrate. Driver circuitry (62), power supplies (66), signal connections and a logic and control circuit (64) are also provided.