Tangential action of mixing is thoroughly obtained by two ‘Z’ shaped kneading blades, which rotates in opposite direction to each other in order to transfer material one blade to another resulting which homogeneous mixing operation performs.
Mixing action is combination of movement, elongating, folding, dividing, and recombining of the dough. Shearing & tearing action of
material through blades and the shell causes size reduction of the solid dough. Once sterilizing the batch has elapsed, the heating circuit
shuts of the pneumatics damper (exhaust) opens and cooling operation commences.
In the tangential design, the blades rotate in the trough meeting tangentially. The front blade generally rotates faster than the rear
blade usually in the ratio of 3:2. Tangential blades are generally used for material of higher viscosity such as adhesives, rubber compounds,
flush colors, dyes, and pigments.
In the overlapping design, the blades overlap above the saddle of the container. Due to the overlapping action it is necessary that the
relative position of the two blades is unchanged, and as a result, both the blades rotate at the same speed. Materials that flow freely or creep down into the blades are mixed using the overlapping blade action. This design offers a faster interchange of material from one blade
compartment of the mixer to the other. Overlapping blade action is used for materials of lighter viscosity such as carbon pastes, clay
coating, creams, and ointments. The overlapping blade produces a lower kneading and shearing compared to the tangential blade action.