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Rheologica Acta
Published in: Rheologica Acta 1/2005

01-09-2005 | Original Contribution

Correlation between rheological behaviour in uniaxial elongation and film blowing properties of various polyethylenes

Authors: Helmut Münstedt, Thomas Steffl, Anneli Malmberg

Published in: Rheologica Acta | Issue 1/2005

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Abstract

Six various low density polyethylenes and one blend were rheologically characterized in elongation. Their different strain-hardening behaviour could qualitatively be related to their molecular structure. All the materials were blown to films on laboratory equipment under various conditions. The take-up force and the film homogeneity were determined quantitatively, the bubble stability was visually assessed. The bubble stability increased with growing take-up force. The take-up force was found to be the stronger the higher the elongational viscosity was. The homogeneity of film thickness is not related to the bubble stability but to the occurrence of strain hardening in the uniaxial elongational experiment at high Hencky strains. Measurements of the uniaxial elongational behaviour of polyethylene melts are a valuable and promising way to assist the development and optimisation of film blowing materials.
previous article Numerical simulation of flow kinematics and fiber orientation for multi-disperse suspension
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Footnotes
1
For the sake of clarity the curves for the LDPE/LLDPE blend were shifted by a factor of 0.5.
 
2
The curves of mLLDPE 11 were shifted by factor 5.
 
Literature
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Metadata
Title
Correlation between rheological behaviour in uniaxial elongation and film blowing properties of various polyethylenes
Authors
Helmut Münstedt
Thomas Steffl
Anneli Malmberg
Publication date
01-09-2005
Publisher
Springer-Verlag
Published in
Rheologica Acta / Issue 1/2005
Print ISSN: 0035-4511
Electronic ISSN: 1435-1528
DOI
https://doi.org/10.1007/s00397-005-0435-6

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