Particle size analyzer

Details Particle size analyzer Particle size analyzer

1997-04-10

2000-06-06

Ballato, Josie

Electricity: measuring and testing

Determining nonelectric properties by measuring electric...

738655, 209233, G01N 2700, G01N 1502

Patent

active

060723084

ABSTRACT:
The application describes a particle size analyser comprising a horizontally held close-coiled helical spring which is partly filled with the powder under test. The operation of the technique involves stretching the spring to various known lengths and vibrating it in the lateral direction at or around its first harmonic resonant frequency with a low amplitude of vibration. Measurements of the mass of the powder discharged from spring coils for a given spring extension and relating the latter to the particle size of the discharged powder by reference to a previously generated calibration curve provide data on the particle size distribution.

REFERENCES:
patent: 4022638 (1977-05-01), Weet
patent: 4298836 (1981-11-01), Groves
patent: 5059310 (1991-10-01), Fischer
patent: 5245290 (1993-09-01), Cannon
T. Allen, "Particle Size Measurement", Fourth Edition 1990, Chapman and Hall, London)--cover page; Table of Contents; pp. 192-217, 248-251, 284-293, 310-311, 344-345, 372-373, 404-407, 454-461, 502-507, 540-541, 596-599, 624-625, 652-655, 682-737.

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