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Some investigations of melt fracture

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Summary

During melt fracture shear stresses and velocity profiles were measured in capillaries and slits. Different polymers show large differences in flow behaviour during melt fracture. The type of melt fracture can be predicted from the shape of the velocity profile in front of the entrance of the capillary or slit. Particular attention was paid to the behaviour of high-density polyethylene during instable flow accompanied by pressure and output variations.

Zusammenfassung

Scherspannungen und Geschwindigkeitsprofile wurden in Kapillaren und Schlitzen bei Schmelzbruch gemessen. Verschiedene Polymere zeigen bei Schmelzbruch große Unterschiede in ihrem Fließverhalten. Die Form des Geschwindigkeitsprofiles vor Eintritt in Kapillare oder Schlitz bestimmt den Typ des Schmelzbruches. Insbesondere wurde das Verhalten von Polyäthylenen hoher Dichte unter Bedingungen untersucht, bei denen instabiles Fließen, Druck- und Ausstoßschwankungen auftreten.

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  1. J. L. den Otter

    Present address: Centraal Laboratorium TNO, Delft, Netherlands

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    1. J. L. den Otter
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    den Otter, J.L. Some investigations of melt fracture. Rheol Acta 10, 200–207 (1971). https://doi.org/10.1007/BF02040441

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    • DOI: https://doi.org/10.1007/BF02040441

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