Method for producing toner

A method for collecting a toner, the method comprising:

• introducing, using an airflow inlet, a centrifugation cylinder with an airflow containing a toner;
• centrifugally separating, using the centrifugation cylinder, the toner by a swirling flow caused by the introduced airflow;
• discharging, using an airflow outlet, the airflow from which the toner has been separated in the centrifugation cylinder,
• wherein the airflow outlet is located at an upper end of the centrifugation cylinder;
• collecting, using a toner collector, the toner separated in the centrifugation cylinder,
• wherein the toner collector is located at a lower end of the centrifugation cylinder;
• suctioning, using a suction unit, an inside of the centrifugation cylinder through the toner collector;
• and
• filtering out, using a filtration filter of the suction unit, the toner in an airflow suctioned by the suctioning unit,
• wherein a ratio of a suction quantity QBD (m3/min) of the airflow suctioned by the suction unit to an introduction quantity Qin (m3/min) at which the airflow containing the toner is introduced to the centrifugation cylinder is more than 0% and 30% or less, and
• wherein a ratio of a filtration area A (m2) of the filtration filter to the suction quantity QBD (m3/min) of the airflow suctioned by the suction unit is 0.4 or more and 4.0 or less.