The extrusion process with polymer pelletizing is performed as cold or hot process. In case of cold pelletizing process, the flow system in the extrusion head for pelletizing (most often the angular, longitudinal or even transverse extrusion head) is generally very similar to the flow system used in the longitudinal, slit extrusion head. In the extrusion process with hot pelletizing, the pelletizing extrusion heads are used that are the combination of the longitudinal extrusion head and the pelletizer. These extrusion heads are designed for simultaneous extrusion of numerous identical polymer rods of a small diameter and their immediate rotational, non-free cutting into short sections.