The sliding grid discharge is recommended for pellet sizes from 2 mm to 10 mm. Design of the system is such that pellets are not crushed. They are "coaxed" rather than forced through the discharge system. Movement of pellets through the system is extremely gentle so as to maintain pellet quality and minimize fines. The grid is virtually self-cleaning, as there are no ledges that could collect material thus reducing cross contamination.
The rotary grid discharge is used when processing a mixture of pellets and large cubes, or when cooling large flakes. The blade rotation allows the pellet to move downward to the hopper discharge. Flow through the system is controlled by adjusting the degree of opening and closing of the grid. This provides a gentle action to maintain pellet quality and minimize fines.