Patent ID: 7560218
Filing Date: 2009-07-14
Classification: B02C,G03G

Abstract:
1. A process for preparing a toner comprising the following steps: (1) pulverizing a pulverized product, which has a volume-median particle size (D (2) classifying the upper limit cut-off classification powder with a classifier, the classifier comprising two classifying rotors sharing a driving shaft arranged in one casing as a central shaft thereof in a vertical direction, and a stationary spiral guiding vane arranged to share the same central shaft as the classifying rotors, wherein the stationary spiral guiding vane is arranged in a classification zone on an outer circumference of the classifying rotors with a given spacing to the outer circumferences of the classifying rotors, wherein the toner has a volume-median particle size (D wherein the fluidized bed jet mill satisfies a formula (A): wherein L is a nozzle distance of the fluidized bed jet mill, and D is a body diameter of the jet mill.