Method and apparatus for induction charging of powder by contact

Details Method and apparatus for induction charging of powder by contact Method and apparatus for induction charging of powder by contact

1987-12-28

1988-10-25

Bueker, Richard

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

427 31, 427 30, 427 57, 118621, 118626, 118629, B05D 104

Patent

active

047803312

ABSTRACT:
Method and apparatus for charging powdered particles and delivering only these charged particles to a workpiece. A high voltage electric field is created between upper and lower surfaces. Powder is continuously delivered to the lower surface. The lower surface is vibrated to bounce the particles so that each repeatedly contacts the lower surface and picks up an electrostatic charge with each contact. When the charge from the particle is great enough to overcome gravity, the particle levitates and is thereafter transported to a workpiece, where it adheres by electrostatic attraction. Three important features of this method are: (1) No uncharged particles are levitated to the workpiece, thereby eliminating the need for recirculating uncharged powder. (2) The method is capable of producing high throughput of charged particles. (3) The method is capable of producing powder with a controlled charge level.

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patent: 3888207 (1975-06-01), Stutz et al.
patent: 3973517 (1976-08-01), Hudson
Hughes, Electrostatic Powder Coating, John Wiley and Sons, N.Y., .COPYRGT.1984 pp. 8-11.

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