Due to the design, extruders do not ensure a very constant pressure at the outlet. Also, the efficiency of increasing the pressure in an extruder is not very good. Therefore, a gear pump is used after the extruder. On the one hand, the pump takes over the pressure build-up and thus relieves the extruder. On the other hand, the gear pump ensures even pressure and reduces the pulsations. The extrusion tools are optimally supplied with the melt.