Semi-empirical equations for the description of Rheotens measurements
As a lab-scaled spinning device the Rheotens test is a well-established method to evaluate the extensional properties of polymer melts. The study presented proposes novel semi-empirical expressions for the description of the force versus draw ratio curve of Rheotens measurements. As a fact of its relevance for spinning processes, a commercial polypropylene grade was used. For the first time a fitting routine is revealed considering not only the steady-state curve of the experiment but also the force oscillations commonly known as draw resonance. Applying the fit function one has access to the melt strength and the critical draw ratio which are characteristic material parameters. This tool enables one to investigate or benchmark polymers whether they are suitable for fibre spinning.
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