DRYING DEVICE, DRYING METHOD AND TONER FOR DEVELOPING ELECTROSTATICALLY-CHARGED IMAGE

摘要

PROBLEM TO BE SOLVED: To prevent production of a coagulated matter of powder such as toner in a drying machine in drying wet powder.;SOLUTION: This drying device comprises a hollow drying portion, at least one gas discharge nozzle discharging a gas into the drying portion, a wet powder supply portion for supplying the wet powder into the drying portion, and a discharge portion for discharging the gas and the dried powder. The dry powder is obtained by dispersing the wet power into the gas discharged from the gas discharge nozzle to the inside of the drying portion, a cross-sectional area in the vertical direction of a shaft of the gas discharge nozzle is maximum at a gas outlet, the relationship of 1.1A1/A24.0 is satisfied when the cross-sectional area of the gas outlet is A1, and a cross-sectional area of a part of the minimum cross-sectional area is A2, and a spread angle from the minimum part of the cross-sectional area to the gas outlet is 10° or less.;COPYRIGHT: (C)2008,JPO&INPIT