Droplet generation

Details Droplet generation Droplet generation

1986-11-13

1990-09-11

Fertig Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Encapsulating normally liquid material

264 5, 264 7, 264 9, 264 10, 435 1, 435178, B29B 910, C12N 1104

Patent

active

049561286

ABSTRACT:
Perfectly spherical, smooth and uniform microcapsules, which may contain living cells, are produced having a diameter less than 700 .mu.m by employing an electrostatic droplet generator. A droplet is suspended from a pointed source, such as a needle, and is charged with high static voltage. A collecting vessel or ring device is charged with opposing polarity and attracts the droplet. When a voltage potential threshold is passed, the droplet moves from the source to the collecting vessel. The voltage pulse height, pulse frequency and length, and extrusion rate of the droplets are adjustable so that predetermined sizes of droplets may be repeatedly generated and collected.

REFERENCES:
patent: 2323025 (1943-06-01), Formhals
patent: 4097373 (1978-06-01), Allred
patent: 4347935 (1982-09-01), Merrill
patent: 4352883 (1982-10-01), Lim
patent: 4391909 (1983-07-01), Lim
patent: 4395716 (1983-07-01), Crean et al.
patent: 4599294 (1986-07-01), Matsumoto et al.

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