Patent ID: 8389193

Claim:
A toner manufacturing method of manufacturing a toner using a toner manufacturing apparatus comprising a powder passage in which powder is flowable, a carrier gas supplying section that supplies a carrier gas to the powder passage, a spraying section that sprays a predetermined substance with the carrier gas to the powder passage, a rotary stirring section disposed in the powder passage for stirring particles in the powder passage to fluidize the particles in the powder passage, and an discharging section that discharges a gas from the powder passage, comprising: a stirring step of rotating the rotary stirring section at a predetermined rotation speed and fluidizing toner core particles and fine resin particles in the power passage as the powder; and a spraying step of spraying with the carrier gas a liquid that plasticizes the fine resin particles as the predetermined substance by the spraying section, during rotation of the rotary stirring section, after a completion of inputting the fine resin particles into the powder passage, and within a period satisfying the following formula (1), the spraying step is started: 1.7≦( F−F 0 )/( F core −F 0 )≦5.7 (1) where F 0 is a load applied to the rotary stirring section when the rotary stirring section is rotated at idle at the predetermined rotation speed, F core is a load applied to the rotary stirring section when the rotary stirring section is rotated at the predetermined rotation speed, and only the toner core particles are fluidized in the powder passage as the powder, and F is a load applied to the rotary stirring section in the stirring step.