... raw material, such as straw, sawdust, wood chips, waste wood, rice husk etc, make density pellets of 1.0-1.4 ... ring die, combine advantages of both flat die pellet machine and traditional ring die pellet machine, unique design, vertical double layer ... materials by adjusting the pressure between roller and die. the material can be wood sawdust, rice husk, bagasse, cottonseed hull mixed with ...