... rollers. They can press 2-15mm diameter biomass ,wood and fertilizer pellets from sawdust,stalk,straw,peanut,sun flower,paper ... unique China national patent.Becasue,standing out from ring dies and other pellet mills is three rollers, adding one more ... is enlarged, which can bear more pressure between rollers and flat die ,increase output, decrease friction, and delay lifetime.besides, the key parts ...