Method for controlling amount of electric charge on finely divid

Details Method for controlling amount of electric charge on finely divid Method for controlling amount of electric charge on finely divid

1998-08-19

2000-05-16

Parker, Fred J.

Coating processes

Direct application of electrical, magnetic, wave, or...

Electrostatic charge, field, or force utilized

427480, 427485, 427486, 427458, 361227, B05D 106

Patent

active

060634510

ABSTRACT:
A method for controlling an amount of electric charge on a finely divided powder. When the finely divided powder is supplied into a powder transportation pipe in a substantially discrete particle state and transported therethrough in a discrete particle state by a stream of a compressed gas having a very small water content whose dew-point is 0.degree. C. or less, electric charge is inevitably produced by friction on the powder by the collision thereof against the inner wall of the transportation pipe. By controlling the dew-point of the compressed gas, the amount of frictional electric charge produced on the powder can be controlled even if there is a change in the type of the finely divided powder, the piping system, the spray nozzle, the type and state of the gas serving as a carrier medium, and environmental conditions such as the atmosphere. Further, a finely divided powder spraying method and apparatus uniformly spray the powder, whose amount of frictional electric charge is controlled as described above, onto a grounded sheet surface in a discrete particle state by means of a two-dimensionally-swinging nozzle.

REFERENCES:
patent: 4597534 (1986-07-01), Ruud
patent: 5000624 (1991-03-01), Steiger
patent: 5332133 (1994-07-01), Murata et al.

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