SRDP series vertical ring die pellet machine is different from other horizontal ring die machine, this machine with vertical structure, easy for biomass materials feeding, big pressure, big capacity and working stable. It is the high efficiency equipment for biomass pellet making. This equipment is good at press low adhesive and hard molding materials, such as press the rice husk, hard wood sawdust, sunflower seeds husk, peanut shell, wood bark and other wood waste, it also can press different kind of straw and agriculture waste. This pellet machine is widely using in biomass pellet making industry and other pellet forming industry.