Method of preparing powder and toner for electrophotography, and toner therefor
A method of preparing a powder, including bombarding a spray gas to a liquid material through a spray nozzle to form an atomized liquid material; and solidifying the atomized liquid material, wherein 5 to 40% by weight of the spray gas are previously mixed with the liquid material to form a two-phase flow in a flow path of the spray nozzle, and 60 to 95% by weight of the spray gas is further discharged from a circumference of the flow path discharging the two-phase flow and bombarded thereto to uniformly atomize the liquid material.
1. A method of preparing a powder, comprising:
bombarding a spray gas to a liquid material through a spray nozzle to form an atomized liquid material; and
solidifying the atomized liquid material,
wherein 5 to 40% by weight of the spray gas are previously mixed with the liquid material to form a two-phase flow in a flow path of the spray nozzle, and 60 to 95% by weight of the spray gas is further discharged from a circumference of the flow path discharging the two-phase flow and bombarded thereto to uniformly atomize the liquid material.
2. The method of claim 1 , wherein the spray nozzle is a venturi nozzle.
3. The method of claim 1 , wherein the spray nozzle is an ejector nozzle.
4. The method of claim 1 , wherein the spray nozzle is a ring nozzle.
5. The method of claim 1 , wherein the two-phase flow is a swirling flow.
6. The method of claim 1 , wherein the spray gas is a swirling flow.
7. The method of claim 1 , wherein the flow path comprises a torque applicator.
8. The method of claim 1 , wherein the flow path has a length not less than 4 times as long as a diameter of a hole discharging the two-phase flow.
9. A method of preparing a toner, wherein the toner is prepared by the method according to claim 1 .