Evaluation of melt flow as a measure of low density polyethylene processability into blown films

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Abstract
Melt capillary flow and extrudate swelling for low density polyethylenes (LDPE), differing in ease of heavy‐duty, blownfilm extrusion, have been employed as processability criteria. LDPE of good processability is characterized by a unique combination of melt fluidity, temperature, shear rate dependence and melt elasticity. These characteristics of flow are correlated with LDPE film blowing process variables such as maximum take‐up speed, film thickness scatter, and extruder temperatures profile. Intuitively, these melt flow criteria should be extended to Trouton's viscosity and the tensile strength of the melt. The limited development of the elongation viscometry techniques, however, has limited their application.

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