Drill pattern
The die hole type is another important issue. At present, the state-of-the-art step-shaped die hole has been practically proved to the most successful and mature design for pellets production and, in particular, for wood pellet production. This picture below shows what a step-shaped ring die hole looks like:
Step-shaped die hole of the pellet mill
Step-shaped die hole
This design mainly benefits in greatly extending the service lifespan for a ring die, which is known to be the most worn part in pellet making equipments.
- See more at: http://www.biofuelmachines.com/Study-on-Dies-for-Wood-Pellet-Machines.html#sthash.Q2baamrr.dpuf