Method and apparatus for automatically fractionating a sample of

Details Method and apparatus for automatically fractionating a sample of Method and apparatus for automatically fractionating a sample of

1977-10-31

1979-01-23

Queisser, Richard C.

Measuring and testing

Liquid analysis or analysis of the suspension of solids in a...

Content or effect of a constituent of a liquid mixture

73432PS, 209270, G01N 1502

Patent

active

041353889

ABSTRACT:
A fractionating apparatus under microprocessor control including a tumbler having a series of screens of progressively larger openings around its periphery. A sample of particulate material is passed successively through each of the screens by incremental rotation of the tumbler. To aid in classifying the fractions, a spray of fluid is projected against the screens and a rocking motion is imparted to the tumbler. The smallest fraction, not being retained, is entrained in a moving stream of fluid and passed directly to a porous weighing member. When this entire fraction is deposited and weighed, the next larger fraction is accumulated in the weighing member. These individual weights and their sum are recorded and from them size percentages are computed.

REFERENCES:
patent: 2782926 (1957-02-01), Saxe
patent: 3439800 (1969-04-01), Tonjes
patent: 3545281 (1970-12-01), Johnson
patent: 3690183 (1972-09-01), Livingood
patent: 3943754 (1976-03-01), Orr, Jr.

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