Process for size separating toner particles

Details Process for size separating toner particles Process for size separating toner particles

1987-05-06

1989-02-07

Reeves, Robert B.

Classifying, separating, and assorting solids

Fluid suspension

Gaseous

209 2, 209146, 209154, 430137, B07B 700, G03G 908

Patent

active

048029777

ABSTRACT:
A process for classifying toner particles supplied through a supply nozzle into at least three fractions in a classifying chamber divided into at least three sections and placed under a reduced pressure under the action of the inertia force of the toner particles supplied together with a gas stream and the centrifugal force of the curved gas stream due to Coanda effect. A first gas introduction pipe and a second gas introduction pipe are disposed above the classifying chamber so as to provide a first inlet and a second inlet opening with the first inlet being disposed closer to the supply nozzle than the second inlet. The absolute values of the static pressures P.sub.1 and P.sub.2 in the first and second gas introduction pipes are controlled so as to satisfy the relations of: .vertline.P.sub.1 .vertline..gtoreq.150 mm.aq., .vertline.P.sub.2 .vertline..gtoreq.40 mm.aq. and .vertline.P.sub.1 .vertline.-.vertline.P.sub.2 .vertline..gtoreq.100 mm.aq.

REFERENCES:
patent: 2222861 (1940-11-01), Stoner
patent: 4132634 (1979-01-01), Rumpf et al.
patent: 4153541 (1979-05-01), Rumpf et al.
patent: 4159942 (1979-07-01), Greer et al.
patent: 4304360 (1981-12-01), Luhr et al.
patent: 4551240 (1985-11-01), Beppu et al.
patent: 4657667 (1987-04-01), Etkin

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