Patent ID: 8236474

Claim:
A method for manufacturing a resin layer-coated toner using a rotary stirring apparatus that comprises: a circulation section which repeatedly circulates a toner base particle and fine resin particles in a powder passage comprising a rotary stirring chamber and a circulation pipe by a rotary stirring section comprising a rotary disk having rotating vanes provided on a circumference thereof and a rotary shaft and returns those particles to the rotary stirring chamber; a temperature regulation section which is provided in at least a part of the powder passage and regulates the temperature in the powder passage and the temperature of the rotary stirring section to a given temperature; and a spraying section comprising a two-fluid nozzle which sprays a substance in liquid form for assisting adhesion between the toner base particle and the fine resin particles from a liquid pipe and sprays a carrier gas from an air pipe, the two-fluid nozzle comprising a liquid pipe and an air pipe, the liquid pipe being inserted in the air pipe such that an axis of the liquid pipe coincides with an axis of the air pipe, and at least a part of the liquid pipe and the air pipe being fixed such that centers of those pipes do not move, the method comprising: spraying the substance in liquid form in a constant rate from the two-fluid nozzle while regulating the temperature and circulating the toner base particle and the fine resin particles, in the powder passage, and thereby forming a film on a surface of the toner base particle.