Toner production process

Details Toner production process Toner production process

1994-01-27

1995-09-05

Eley, Timothy V.

Solid material comminution or disintegration

Processes

By utilizing kinetic energy of projected or suspended material

241 19, 430137, B02C 2330

Patent

active

054472750

ABSTRACT:
A gas stream classifier includes: a gas stream classifying means for classifying feed powder into at least a coarse powder fraction and a fine powder fraction by an inertia force acting on particles and a centrifugal force acting on a curved gas stream due to Coanda effect in a classifying chamber, and a feed supply pipe opening into the classifying chamber for supplying the feed powder into the classifying chamber. The efficiency of the classifier is improved by providing the feed supply pipe with a mixing zone for mixing an upper stream and a lower stream of the feed powder and an accompanying gas stream, respectively flowing through within the feed supply pipe. The classifier is particularly suitably used for producing a toner for developing electrostatic images having a sharp particle size distribution from toner particles having a weight-average particle size of at most 10 .mu.m, especially at most 8 .mu.m.

REFERENCES:
patent: 4657667 (1987-04-01), Etkin
patent: 4784333 (1988-11-01), Hikake et al.
patent: 4802977 (1989-02-01), Kanda et al.
patent: 4844349 (1989-07-01), Kanda et al.
patent: 4989794 (1991-02-01), Askew et al.
patent: 5016823 (1991-05-01), Kato et al.
patent: 5111998 (1992-05-01), Kanda et al.
Okuda, et al., "Application of Fluidics Principle to Fine Particle Classification", Powder Technology, publ. by Hemispher Publishing Corp., pp. 771-780 (1981).

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