PNEUMATIC CLASSIFIER AND PRODUCTION OF TONER

摘要

PURPOSE: To provide a pneumatic classifier capable of efficiently forming a powder having a fine particle size distribution with higher precision and appropriate for the production of an electrostatic charge image developing toner. CONSTITUTION: A raw powder is classified by a pneumatic classifier utilizing the Coanda effect. A raw powder feed nozzle 16 having an opening 16a for injecting the raw powder into the classifying zone 32 of a classification chamber is provided, a port 40 for supplying the raw powder into the nozzle is furnished above the nozzle, and a Coanda block 26 is provided at a position higher than the opening of the nozzle.