Ribbon mixer consists of a U-shaped horizontal trough and an agitator made up of inner and outer helical ribbons that are pitched to move material axially, in opposing directions, and also radially. This combination promotes fast and thorough blending.

Principle (single ribbon)

Mixing is functioned by means of pushing back and forth and stirring between two different diameters of ribbon screws which rotate in counter direction but both connect to main shaft

Principle (double ribbon)
The main mixing shaft assembled with a couple of ribbon screw and another single ribbon that making mixture spray and mixing homogenous to arrive best mixing efficiency.