Compounds of powder rubber based on NR/CB were produced by using the twin-screw extruder equipped with well-designed screw configuration. A significant increase of the output was achieved with increasing screw speed at moderate mixing temperatures, while retaining good material properties. In addition the development of the degree of dispersion, Mooney-viscosity and temperature along the extruder screw was studied. Several configurations of the latter were tested at constant parameters. A high mixing quality could be reached by one extrusion zone with appropriate mixing elements. Two extrusion concepts are proposed for the simplification of the continuous mixing process of powder rubber.