The compression ratio of the biomass pellet machine ring die is determined according to the density and hardness of different wood chips. Generally, different wood chips use different compression ratios. The conventional requirement is that the compression ratio of softwood is relatively large, and the compression ratio of hardwood is smaller. Therefore, when we produce biomass pellets, we must confirm the compression ratio according to the type of wood chips. Before the biomass pellet machine ring die is officially put into production, it is necessary to carry out a trial run first, mix wood chips with oil and fine sand, conduct a trial run, grind the ring die, and then the biomass pellet machine ring die will achieve a good working state, so that the biomass pellets produced will be shiny.

The compression ratio of biomass pellet machine ring die is calculated as follows:
For example, 560 biomass pellet machine ring die, the thickness is 65mm, the compression hole stroke is 45mm, and the aperture is 8mm. The compression ratio is 45/8=5.6. This compression ratio is suitable for pine, straw, rice husk, etc.
For example, 560 biomass pellet machine ring die, the thickness is 65mm, the compression hole stroke is 55mm, and the aperture is 8.5mm. The compression ratio is 55/8.5=6.5. This compression ratio is suitable for poplar, tree heart, palm silk, etc.