AbstractThe elongational viscosity (EV) of two series of linear low‐density polyethylene/low‐density polyethylene blends was estimated using an entry flow analysis. The difference,t−n, between the power law indextof the elongational viscosity and the power law indexnof the viscosity, is proportional to the LDPE content for both series of blends investigated. Comparison of theEVof the LLDPE/LDPE blend estimated from the analysis of the flow into an orifice die to theEVvalue estimated from the analysis of the flow into a capillary die with a flat entry, showed that the difference in geometry had little effect on theEVesti