Underwater Pelletizer

An underwater pelletizer including a die plate, a cutting chamber housing having a cutting chamber and a rotatably drivable cutter head, which is arranged in the cutting chamber for dividing melt strands output from the die plate into pellets. The cutting chamber is flushed through by process water which can be introduced through at least one inlet into the cutting chamber and, together with the cut pellets, can be discharged from the cutting chamber via an outlet. A plurality of flow channels and/or chambers are provided in the cutting chamber housing for generating different process water streams, which include at least one co-rotating flow path passing through at least one cutter head channel through the rotating cutter head, as well as at least one flow path which does not co-rotate and which leads from a fixed inlet into the cutting chamber.