Patent ID: 8100578

Claim:
Helical ribbon mixing gear with a mixing vessel ( 1 ), the inside of which is axially symmetrical, and a motor-driven central agitator axis ( 2 ) with laterally extending agitator arms ( 30 , 31 , 32 ) to which at least one sloping helical ribbon ( 4 ) with a circular inclination in a direction of rotation (D) is attached, an outside edge of the helical ribbon ( 5 ) being positioned near to a mixing vessel wall ( 10 ), characterized in that an outer tooth profile ( 50 - 52 ) is formed at the wall-sided edge of the helical ribbon ( 40 ), with a radial profile depth (T), which is lower than a radially adjacent ribbon width (B), and with a circular tooth spacing (W) of one to ten times of the profile depth (T).