Apparatus and process for producing powders and other granular m

Details Apparatus and process for producing powders and other granular m Apparatus and process for producing powders and other granular m

1987-06-16

1988-11-29

Lawrence, Evan

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

Utilizing electrical energy

239 3, 239690, 425 6, B29B 900, B05B 502

Patent

active

047880163

ABSTRACT:
Electrostatic spraying apparatus and process for spraying liquids which form a coalescent resistant surface in flight in a particular environment to produce a powder or granular material. The process involves delivering a liquid to a spraying site of an electrostatic spray head; making contact with the liquid via an electrically conducting or semiconducting liquid contacting surface; charging the liquid contacting surface to a high voltage of one polarity relative to a reference surface to intensify the electric field strength at the spraying site sufficiently that the liquid at the spraying site is drawn out preponderantly by electrostatic forces into at least one cone from which a corresponding ligament issues and breaks up into a spray of electrostatically charged droplets; providing the environment in a space sufficient that droplets from the spray head form, in flight, particles having a substantially coalescent resistant surface; and collecting the particles so formed.

REFERENCES:
patent: 4148932 (1979-04-01), Tada et al.

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