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External Calibration in PA12 Tube Extrusion

Part I: On-line Draw Ratio Measurement and Lubrication Estimate for Determination of Tensile Properties
  • A. Carin , J.-M. Haudin , M. Vincent , B. Monasse , G. Bellet and D. Silagy
Published/Copyright: April 30, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 20 Issue 3

Abstract

In PA12 tube extrusion, calibration or sizing is the key step of the process that affects subsequent mechanical properties. The extruded tube is pulled through a cylindrical calibrator under vacuum. A water flow rate is applied at the inner side of the calibrator, creating a lubricant water layer at the polymer outer surface. The scope of this article is to show how this lubrication influences the elongation at break of tubes through drawing kinematics of the polymer. Lubricant water layer thickness measurements and on-line video recording have been employed to monitor the lubrication dependence of the velocity profiles from the extruder die to the end of calibrator. Velocities were measured through three independent innovative methods and thirty-two calibration conditions have been carried out to validate our work. Three main calibration parameters were found to determine the water layer thickness: the level of vacuum applied in the calibration tank, the water flow rate at the calibrator entrance, and the line speed. The influence of each parameter on lubrication level was found out. Simultaneously, the draw ratio in the calibration tank was deduced from velocity profiles. This parameter was found to affect tensile properties and to depend strongly on the level of lubrication during calibration. We showed quantitatively that rising the water layer thickness leads to a diminution of the draw ratio in the calibration tank and an increase of the elongation at break. This implies that we are now able to optimize tensile properties by fitting the main calibration parameters to improve lubrication and restrict draw ratio in the calibration tank.

∗ Mail address: A. Carin, Centre de Mise en Forme des Matériaux, UMR CNRS n° 7635, Ecole des Mines de Paris, BP 207, 06904 Sophia Antipolis Cedex, France E-mail:

References

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Received: 2004-11-15
Accepted: 2005-5-13
Published Online: 2013-04-30
Published in Print: 2005-09-01

© 2005, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Regular Contributed Articles
  4. Assessment of the Degree of Mixedness of Filled Polymers
  5. Screw Extrusion
  6. Numerical Analysis of Rubber Moulding Using Finite Element Modelling
  7. Regular Contributed Articles
  8. Experimental Study on the Filling of a Micro Injection Molding with Cylindrical Dot Patterns
  9. The Gloss of Injection-Moulded Recovered Polypropylene
  10. Injection Moulding and Mechanical Properties of Recovered Polypropylene
  11. Advanced Finite Element 3D Injection Molding
  12. Using Multi-Objective Evolutionary Algorithms to Optimize Mechanical Properties of Injection Molded Parts
  13. On PVT and Rheological Measurements of Polymer Melts
  14. External Calibration in PA12 Tube Extrusion
  15. Screw Extrusion
  16. External Calibration in PA12 Tube Extrusion
  17. Regular Contributed Articles
  18. Two Dimensional Description of Pressure-Throughput Behaviour of Newtonian Materials Considering Wall Slippage Effects
  19. Experimental Studies and Modeling of Development of Dispersion and Fiber Damage in Continuous Compounding
  20. PPS News
  21. PPS News
  22. Seikei-Kakou Abstracts
  23. Seikei-Kakou Abstracts
https://doi.org/10.3139/217.1891

Articles in the same Issue

  1. Contents
  2. Contents
  3. Regular Contributed Articles
  4. Assessment of the Degree of Mixedness of Filled Polymers
  5. Screw Extrusion
  6. Numerical Analysis of Rubber Moulding Using Finite Element Modelling
  7. Regular Contributed Articles
  8. Experimental Study on the Filling of a Micro Injection Molding with Cylindrical Dot Patterns
  9. The Gloss of Injection-Moulded Recovered Polypropylene
  10. Injection Moulding and Mechanical Properties of Recovered Polypropylene
  11. Advanced Finite Element 3D Injection Molding
  12. Using Multi-Objective Evolutionary Algorithms to Optimize Mechanical Properties of Injection Molded Parts
  13. On PVT and Rheological Measurements of Polymer Melts
  14. External Calibration in PA12 Tube Extrusion
  15. Screw Extrusion
  16. External Calibration in PA12 Tube Extrusion
  17. Regular Contributed Articles
  18. Two Dimensional Description of Pressure-Throughput Behaviour of Newtonian Materials Considering Wall Slippage Effects
  19. Experimental Studies and Modeling of Development of Dispersion and Fiber Damage in Continuous Compounding
  20. PPS News
  21. PPS News
  22. Seikei-Kakou Abstracts
  23. Seikei-Kakou Abstracts
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