公开(公告)号：JPH02237667A

公开(公告)日：1990-09-20

申请号：JP1047890

申请日：1990-01-19

Applicant: NORDSON CORP

Inventor： ROBAATO ERU UOOKAA ,  DONARUDO II SHIYASUTAA ,  JIYON SHIYAAPURESU ,  ARAN JIEE NOBE ,  JIEEMUZU SHII MAAFUI

IPC: B05B5/04 ,  B05B5/053 ,  B05B5/06 ,  B05B7/08

Abstract: PURPOSE: To provide an electrostatic spraying apparatus which is safe and is high in coating material transfer efficiency by reducing the amt. of a conductive material used for a rotary atomizer as far as possible. CONSTITUTION: The liquid coating material in an annular cavity 34 is admitted through a coating material passage 36 into a forward cup cavity 38 by rotation of a cup 20 and is moved toward a front atomizing edge 42 along an inside cup wall 40. The coating material is then atomized by centrifugal force to form an atomizing spray pattern 29. The liquid coating material is electrified by coming into contact with an electrifying electrode 46 at the time of moving from the passage 36 to the front atomizing edge 42 of the cup. The forward projecting ends of conductors 214, 218b and 220b part extremely slightly from the outside surface of a semiconductor ring 102 and when high voltage is transmitted from an insulation cable 74 to the conductors 214, 218b and 220b, the electrostatic energy is transmitted beyond this spacing to the semiconductor ring 102 and is transferred to the ring electrode 46 via a pin 104, by which the liquid coating material is contactually electrified.