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Two separate ranges for shear flow instabilities with pressure oscillations in capillary extrusion of HDPE and LLDPE

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Summary

In polymer melt extrusion at constant piston rates, it is well known that linear polymers show a characteristic type of flow instability within a single range of flow rates. In this range, pulsations of the extrusion pressure occur in connection with typical distortions of the extrudate. When several HDPE and LLDPE samples were tested, it was found that one HDPE and one LLDPE sample showed two separate ranges of pulsating pressure in connection with characteristic distortions of the extrudate.

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Authors and Affiliations

  1. Department 6, Teachers Office, Beijing Institute of Technology, 621, Beijing, China

    H. Li

  2. Institut für Polymere, Eidgenössische Technische Hochschule (ETH), CH-8092, Zürich, Switzerland

    H. P. Hürlimann & J. Meissner

Authors
  1. H. Li
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  2. H. P. Hürlimann
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  3. J. Meissner
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Li, H., Hürlimann, H.P. & Meissner, J. Two separate ranges for shear flow instabilities with pressure oscillations in capillary extrusion of HDPE and LLDPE. Polymer Bulletin 15, 83–88 (1986). https://doi.org/10.1007/BF00263497

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  • DOI: https://doi.org/10.1007/BF00263497

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