For pelleting with ring dies, the monoroll design with support roll with patent claim (EP 0867273A3) was developed.
Ring dies with support roll in
Patent EP 0867273A3
A support roll in the die ensures pressure compensation of the leverage force. This design would be suitable for conversion of existing ring die presses with multiple rollers to the monoroll system. The material feed is realized by gravity via a sliding mechanism between roller/die or a screw conveyor.
Figures 1 A and 1 B