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Experimental Investigation of the Development of Interfacial Instabilities in Two Layer Coextrusion Dies

  • R. Valette , P. Laure , Y. Demay and J.-F. Agassant
Published/Copyright: May 2, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 19 Issue 2

Abstract

The stability of two-layer flow of polyethylene and polystyrene is experimentally studied in different flow geometries and for various flow rate ratios. A first coextrusion device allows to stop the coextrusion flow in a very long slit channel, to cool down the polymer sample and to dismantle the die in order to extract extrudate which is then carefully analyzed.

A second device allows to observe the whole slit flow through transparent lateral walls and to record the interfacial waves in both spontaneous and controlled unstable conditions.

Both devices point clearly out that the interfacial defect begins to grow after a specific flow distance and is then quickly amplified. This demonstrates the convective character of interfacial wave. Controlled unstable processing conditions in transparent die allow to measure accurately growth rate of defect in the linear regime and show quick occurrence of non linear regime.

∗ Mail address: R. Valette, Centre de Mise Forme des Matériaux, Ecole Nationale Supérieure des Mines de Paris-UMR 7635 CNRS, 06904 Sophia Antipolis, France E-mail:

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Received: 2003-10-6
Accepted: 2004-2-5
Published Online: 2013-05-02
Published in Print: 2004-05-01

© 2004, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. DuPont, IG Farbenindustrie, ICI and Japanese PA Fiber Manufacturers Polyamides 66 and 6
  5. Screw Extrusion
  6. Modeling the Flow in the Metering Zone of Single Screw Extruders Using a Helical Geometry Model
  7. Engineering Analysis of Devolatilization of Various Additives in Intermeshing Co-rotating Twin Screw Extruders
  8. Die Extrusion
  9. Novel Extrusion Dies with Rotating Rollers for CO2-Plastic Foam Production
  10. Experimental Investigation of the Development of Interfacial Instabilities in Two Layer Coextrusion Dies
  11. Detachment of the Polymer Melt from the Roll Surface: Calendering Analysis and Data from a Shear Roll Extruder
  12. Reactive Extrusion
  13. Reactive Extrusion of SAN/EPDM Blends
  14. Film
  15. Easy Tear Film of Biaxially Oriented PA 6/MXD 6 Blend by Double Bubble Tubular Film Process
  16. Deformation Behavior, Processability and Physical Properties for Biaxially Oriented Film of LLDPE
  17. Stretchability and Properties of LLDPE Blends for Biaxially Oriented Film
  18. Stretchability and Properties of Various LLDPE for Biaxially Oriented Film
  19. Molding
  20. Microinjection Molding with LIGA-Like Process
  21. Thermoforming
  22. On the Use of the Heating Stage to Control the Thickness Distribution in Thermoformed Parts
  23. PPS News
  24. PPS News
https://doi.org/10.3139/217.1819

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. DuPont, IG Farbenindustrie, ICI and Japanese PA Fiber Manufacturers Polyamides 66 and 6
  5. Screw Extrusion
  6. Modeling the Flow in the Metering Zone of Single Screw Extruders Using a Helical Geometry Model
  7. Engineering Analysis of Devolatilization of Various Additives in Intermeshing Co-rotating Twin Screw Extruders
  8. Die Extrusion
  9. Novel Extrusion Dies with Rotating Rollers for CO2-Plastic Foam Production
  10. Experimental Investigation of the Development of Interfacial Instabilities in Two Layer Coextrusion Dies
  11. Detachment of the Polymer Melt from the Roll Surface: Calendering Analysis and Data from a Shear Roll Extruder
  12. Reactive Extrusion
  13. Reactive Extrusion of SAN/EPDM Blends
  14. Film
  15. Easy Tear Film of Biaxially Oriented PA 6/MXD 6 Blend by Double Bubble Tubular Film Process
  16. Deformation Behavior, Processability and Physical Properties for Biaxially Oriented Film of LLDPE
  17. Stretchability and Properties of LLDPE Blends for Biaxially Oriented Film
  18. Stretchability and Properties of Various LLDPE for Biaxially Oriented Film
  19. Molding
  20. Microinjection Molding with LIGA-Like Process
  21. Thermoforming
  22. On the Use of the Heating Stage to Control the Thickness Distribution in Thermoformed Parts
  23. PPS News
  24. PPS News
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