A hammermill is a machine used to shred or crush materials such as woody biomass into smaller pieces. The basic design involves a rotating shaft to which free-swinging hammers rotate at a high speed. The drum holds the material that needs to be processed until it can be crushed by the mill. A hopper feeds the source material into the drum. The hammers gradually break up the material until it is small enough to pass through a screen with openings corresponding to the desired size. The biggest disadvantage of using a hammermill is, having to replace its lining because of the constant wear of the rotating hammers.
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