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Raw Materials? of Vertical Ring Die Wood Pellet Mill?Raw material types and features can exert great influence on biomass pellet production. For example:--Biomass pellet made from hard wood has smaller productivity than that made from soft wood as hard wood like birch, elm are drier and denser than soft wood like pine, spruce and firs, thus wood pellet capacity is elastic.--Raw material should not be completely fine powder, although the fiber material in powder is in favor of wood pellet forming, the powder should be 3-5mm,neither too small nor too big.So for super quality wood pellets production, choosing the proper material type is significant.link:http://www.pelletmillchengda.com/pellet-machinepellet-machine/ring-die-pellet-machine/ring-die-mkl560.html