Process for producing toner for developing electrostatic images.

摘要

A toner for developing electrostatic latent images is produced by classifying feed toner particles supplied through a supply nozzle (16) into at least three fractions in a classifying chamber divided into at least three sections (11,12,13) 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 (14) and a second gas introduction pipe (15) 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 magnitudes of the static pressures P1 and P2 in the first and second gas introduction pipes are controlled so as to satisfy the relations of: ¦P1¦ @>/=@ 150 mm.aq., ¦P2¦ @>/=@ 40 mm.aq. and ¦P1¦ - ¦P2¦ @>/=@ 100 mm.aq.