The WL 20 single-shaft shredder is used in the woodworking industry for shredding large quantities of timber waste. The rotor width is 2000 mm. The machine is driven by an electric motor with an output of 55 kW to 110 kW. The level of required drive output depends on the material to be shredded, the number of shredding knives being used and the required throughput rate. Material is fed through the hopper to fall in front of a hydraulically operated drawer that presses the material, according to load, onto the turning rotor. The material is shredded between the rotor knives and a fixed stationary counter knife. The drawer is equipped with castellation as is the floor to prevent materials being lodged between the drawer and the machine casing. The chips produced can be conveyed from the output of the machine by an air extraction system, screw or belt conveyor.