The effect of the die geometry on the rheological response at capillary extrusion is studied using isotactic polypropylene (PP). Drawdown force, defined as force needed to stretch a polymer melt uniaxially, increases with an increase in die length. This phenomena attributes to high level of molecular orientation in a long die, leading to a decrease in the density of entanglements, and thus allows rapid crystallization. Furthermore, the swell ratio decreases with the die length, owing to the reduction of the entanglement coupling.