Patent ID: 8469297

Claim:
An airflow classifier comprising: a dispersing chamber to disperse a powdery raw material with high pressure air; a classifying chamber located below the dispersing chamber and including: a center core located on an upper portion of the classifying chamber; and a separator core having an opening at a center thereof and located on a lower portion of the classifying chamber to subject the powdery raw material, which is fed from the dispersing chamber, to centrifugal classification to classify the powdery raw material into relatively coarse particles and relatively fine particles; a fine particle feeding pipe connected with a lower portion of the opening of the separator core to feed the relatively fine particles; a shield ring covering an upper portion of the opening of the separator core; and a louver pipe which is located above the shield ring and in which plural blades are arranged on an edge of the opening of the separator core at predetermined intervals.