The neck-in level and the maximum drawdown speed at extrusion coating for low-density polyethylene are studied with the evaluation of the rheological properties in the molten state and the dilute solution properties. It is found that the viscous properties in the molten state and the dilute solution properties are not sensitive to the processability, whereas the elastic nature has a great impact. In particular, the elastic response in the nonlinear region, such as drawdown force and strain-hardening behavior in elongational viscosity, can be employed for the prediction of the processability at extrusion coating.

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