In assisting product development the processing behaviour of similar and different samples of polyethylene film grades were compared with laboratory data. Bubble stability of the samples in film blowing on a commercial production line is related to rheological properties in elongation. Strain hardening behaviour enhances stability as is well known. The influence of even small differences can be shown, but in these cases the linear viscoelastic stress growth, the absolute value of the viscosity, and the activation energy of flow become important as well. The experimental results are discussed confirming the pulsations to be a kind of draw resonance.
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M. Fleißner (1988) studied this question.
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