Ring Die Pellet Mills

Ring die pellet mills are preferred to flat die pellet mills in large scale commercial and industrial production. Ring die pellet mills are not as widespread as those with flat dies due to the machines' greater complexity and higher costs. As the die's name suggests, the ring die has a wide cylindrical shape and is mounted vertically, rather than flat and horizontally as with a flat die. A surge bin is used to feed biomass materials through a variable speed conditioner before being distributed through the pellet mill door. A screw auger is useful at this last step of centering the materials in the pellet mill chamber.

Advantages of Ring Die Pellet Mill:

There are two main advantages when using ring die pellet mills. First, ring die pellet mills generate less wear and tear since both the inner and outer edges of the roller traverse the same distance. Second, ring die pellet machines are more energy efficient the flat die design. Roller slip during the pelleting process brings extra friction, but this extra friction is an accelerant in the production of quality wood pellets due to the additional heat.