Papermaking screen apparatus

A screen apparatus comprising:

• a tank configured to accept a papermaking raw material;
• a screen configured to partition the tank into a primary chamber and a secondary chamber;
• a papermaking raw material supply passage that communicates with the primary chamber of the tank, and supplies the papermaking raw material to the tank;
• a foreign material discharge passage that communicates with the primary chamber, and discharges the papermaking raw material containing a foreign material that does not pass through the screen to outside of the tank;
• a papermaking raw material discharge passage that communicates with the secondary chamber, and discharges the papermaking raw material that passed through the screen to the outside of the tank;
• a cylindrical rotor body that is rotatably provided in the primary chamber as the inside of the screen, and stirs the papermaking raw material in the primary chamber;
• and
• a stepped stirring member provided on a side surface of the rotor body except for two end surfaces thereof,
• wherein the stepped stirring member is formed to have a downward gradient with respect to a papermaking raw material flow.