HEAT TREATMENT DEVICE FOR POWDER PARTICLE AND METHOD FOR PRODUCING POWDER PARTICLE

摘要

PROBLEM TO BE SOLVED: To provide a method for producing toner where, in the case where powder particles for toner comprising wax are spheroidized by heat treatment, the exudation of the wax to the surfaces of the powder particles is suppressed, and fusion at the inside of the device can be reduced.SOLUTION: Provided is a heat treatment device of heat-treating powder particles, comprising: a treatment chamber; a powder particle feeding means 2; a hot air feeding means 3; a cold blast feeding means 4; a regulation means 5; and an exhaust port 6. The hot air feeding means comprises a revolving part, in the powder particle feeding means, the angle (°) formed between the cross-section orthogonal to the central axis of the cylindrical treatment chamber and the introduction direction of the powder particles introduced from the powder particle feeding means outlet satisfies 17(°)37(°), and, in the cold blast feeding means, the angle (°) formed between the cross-section orthogonal to the central axis of the cylindrical treatment chamber and the introduction direction of the cold blast introduced from the cold blast feeding means outlet satisfies 17(°)37(°).SELECTED DRAWING: Figure 1