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Characterization of the Sharkskin Defect and its Development with the Flow Conditions**

  • P. Beaufils , B. Vergnes and J. F. Agassant
Published/Copyright: May 27, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 4 Issue 2

Abstract

We have studied the development of the sharkskin defect of a linear low density polyethylene, by using complementary experimental techniques. Roughness measurements have allowed to accurately characterize the surface of the extrudates. Flow birefringence observations have permitted to visualize the flow conditions inside the die. The development of the defect is strongly dependent on the temperature and quasi-independent on the geometry (die length, entry angle). Theoretical computations of the flow through the slit die have allowed the correlation of the amplitude of the defect with the stress distribution. Sharkskin defect appears as a continuous and regular phenomenon of surface degradation without intervention of wall slip.

* Mail address: Dr. B. Vergnes C.E.M.E.F, Ecole des Mines de Paris, Sophia Antipolis, 06 560 Valbonne, France.

** Paper presented at the fourth annual meeting of the Polymer Processing Society, Orlando, U.S.A., May 1988

Published Online: 2013-05-27
Published in Print: 1989-05-01

© 1989, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Review Paper
  4. New Developments in Fiber- and Filmextrusion
  5. Original Contributions
  6. Use of Chilled Die Lips to Improve Production Rates in Extrusion of PE
  7. Characterization of the Sharkskin Defect and its Development with the Flow Conditions**
  8. Modifying Threadline Dynamics in the High-speed Melt Spinning Process
  9. Computer Simulation of Multi filament Air Jet Melt Spinning
  10. Structure Development in the Melt Spinning and Drawing of Poly p Phenylene Sulfide Fibers
  11. Cast Film Extrusion of Polypropylene Films
  12. Air Ring Effect on Blown Film Dynamics
  13. Computer Simulation of Melt Viscoelasticity Functions for Binary Polyblends
https://doi.org/10.3139/217.890078

Articles in the same Issue

  1. Contents
  2. Contents
  3. Review Paper
  4. New Developments in Fiber- and Filmextrusion
  5. Original Contributions
  6. Use of Chilled Die Lips to Improve Production Rates in Extrusion of PE
  7. Characterization of the Sharkskin Defect and its Development with the Flow Conditions**
  8. Modifying Threadline Dynamics in the High-speed Melt Spinning Process
  9. Computer Simulation of Multi filament Air Jet Melt Spinning
  10. Structure Development in the Melt Spinning and Drawing of Poly p Phenylene Sulfide Fibers
  11. Cast Film Extrusion of Polypropylene Films
  12. Air Ring Effect on Blown Film Dynamics
  13. Computer Simulation of Melt Viscoelasticity Functions for Binary Polyblends
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