The invention relates to a method for the extrusion of plastic materials, especially of polymer melts and mixtures of polymer melts, particularly thermoplastics and elastomers, especially preferred polycarbonate and polycarbonate blends, with the possible admixture of other substances such as e.g. solids, liquids, gases or other polymers or other polymer mixtures having improved optical properties, using a multi-shaft extruder having specific screw geometries.