Small pellet mill is also called flat die pellet mill, which is a small type pellet making machine with small capacity. This pellet machine has two types, D-type and R-type. The two type flat die pellet mill are all good at making wood pellets. Relatively speaking, the yield of D-type is less than R-type. So it is more suitable for processing soft wood raw materials ( like pine wood ). Besides, the investment is lower. R-type is more suitable for harder wood raw materials ( like Oak wood ). From the aspect of structure, the roller of D-type pellet press is fixed on the upper machine and the die rotates with the main shaft. R-type is contrary to D-type, the die of R-type is fixed while the roller rotates.