The numerical analysis of the flow in a wedge slit with plane walls is presented for fluids with pseudo plastic flow behavior. Additionally to this analysis the flow in a combined wedge-rectangular-slit system is calculated. Shear, elongation and resulting total deformation at the wedge slit exit are quantified with specific numbers. The calculated residential time in the wedge slit allows the determination of the elongational rate and the Deborah number in order to characterize the entropy elastic state of melt particles.