Weld lines often generate mechanical weak points, because of the unfavorable orientation of the macromolecules, fibers and/or other fillers perpendicular to the main flow direction. In order to reduce these weak points, the IKT is developing a new technique for injection molding which can be integrated into the molding tool. The technique provides a reorientation of unfavorably oriented fillers. A ram is integrated into the weld line area, thus creating a second cavity in the retracted state. This cavity is filled with melt during the filling process. The goal is to create a flow through the weld line by pushing back this melt into the main cavity and hence to achieve the targeted reorientation of the fillers. Injection molding simulation results of fiber-filled plastics show that this fiber reorientation is possible. First trials by means of a prototype molding tool confirm these results. However, further investigations are necessary in order to elaborate the optimal design and to fully exploit the potential of this new method.