Wood is a widely used and valuable material. Some waste wood, including industrial pallets, sleepers, medium density fibreboard (MDF), chipboard, trimmings, branches and bark, etc., can be shredded to reduce its volume and recovered and converted into a variety of valuable resources such as wood chips, biomass and fuel sticks (briquettes). Biomass produced from waste wood is one of the most popular sources of energy in some large biomass cogeneration plants.