Thermorheological simplicity is available for the extrusion flow curves of polymers in a way similar to the case of creep or stress relaxation. The true consistency curves for acrylic resin which were obtained from the extrusion flow curves at various extrusion temperatures by the help of the end‐correction factor &xgr; are superimposed by shifting along the logDw′ (whereDw′ is apparent maximum shear rate at the die wall). Thus the consistency curves by extrusion which are useful for evaluating the viscoelastic behavior of amorphous linear polymers can easily be determined over a sufficiently wide range of shear rates by the change of extrusion temperature.