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Investigation of the Cooling Jets Used in the Blown Film Process

  • N. Gao , S. Li and D. Ewing
Published/Copyright: April 30, 2013
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International Polymer Processing
From the journal International Polymer Processing Volume 20 Issue 1

Abstract

Measurements were performed to characterize the development of the cooling jets produced by a typical dual-lip air ring used in the blown film manufacturing process. The distribution of the pressure on the bubble surface and the velocity field in the region above the forming cone were measured for a rigid model bubble with a blow-up ratio of 2.5. The measurements indicated that the development of the flow below the top of the forming cone in the air ring could be divided into two regions separated by local maxima in the static and fluctuating pressure. These maxima seemed to be associated with the location where the lower jet attached to the bubble surface. There was a region of negative gauge pressure on the bubble surface below the forming cone that should act to stabilize the bubble against the forming cone in practical applications. Above the forming cone, the lower jet was initially decelerated and then entrained into the upper jet. The upper jet then attached to the bubble surface and finally the flow recovered to a wall jet along the bubble surface. The profiles of the static and fluctuating pressure in the first and third regions above the forming cone collapsed reasonably well when they were scaled using the velocity of the lower jet and the velocity of the upper jet, respectively. The magnitude of the local maxima in the static and fluctuating pressure where the upper jet attached to the bubble depended on the upper jet velocity and the ratio of the upper and lower jet velocities.

∗ Mail address: D. Ewing, Dept. of Mech. Eng., McMaster University, Hamilton, Ontario, Canada, L8S 4L7 E-mail:

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Received: 2004-10-14
Accepted: 2004-12-13
Published Online: 2013-04-30
Published in Print: 2005-03-01

© 2005, Carl Hanser Verlag, Munich

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. New at International Polymer Processing
  5. Regular Contributed Articles
  6. Preparing of Homogeneous Solution of Ultrahigh Molecular Weight PAN
  7. Non-linear Viscoelastic Behavior of PVC Plastisol
  8. Algorithms for Two Gate Optimization in Injection Molding
  9. Viscoelastic Properties of Flexible Organic Fiber Composites
  10. Mold for Manipulation Microstructure Development
  11. Simultaneous Biaxial Stretching of PP Resins of Varying Tacticity
  12. Rotational Moulding of PVC Plastisol
  13. Drawability of As-spun PP Fibres
  14. Melt Fracture of Linear PE
  15. Investigation of the Cooling Jets Used in the Blown Film Process
  16. Non-linear Crystalline Spherulitic Growth Behavior for LLDPE
  17. Design Sensitivity Analysis for the Optimization of the Injection Molding Process
  18. Preparation and Characteristics of Reactive Blends of Phosphate-containing Maleimide and Epoxy
  19. Easy Tear Multilayer Film of Biaxially Oriented PA6/MXD6 by Double Bubble Tubular Film Process
  20. PPS News
  21. PPS News
  22. Seikei-Kakou Abstracts
  23. Seikei-Kakou Abstracts
https://doi.org/10.3139/217.1866

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. New at International Polymer Processing
  5. Regular Contributed Articles
  6. Preparing of Homogeneous Solution of Ultrahigh Molecular Weight PAN
  7. Non-linear Viscoelastic Behavior of PVC Plastisol
  8. Algorithms for Two Gate Optimization in Injection Molding
  9. Viscoelastic Properties of Flexible Organic Fiber Composites
  10. Mold for Manipulation Microstructure Development
  11. Simultaneous Biaxial Stretching of PP Resins of Varying Tacticity
  12. Rotational Moulding of PVC Plastisol
  13. Drawability of As-spun PP Fibres
  14. Melt Fracture of Linear PE
  15. Investigation of the Cooling Jets Used in the Blown Film Process
  16. Non-linear Crystalline Spherulitic Growth Behavior for LLDPE
  17. Design Sensitivity Analysis for the Optimization of the Injection Molding Process
  18. Preparation and Characteristics of Reactive Blends of Phosphate-containing Maleimide and Epoxy
  19. Easy Tear Multilayer Film of Biaxially Oriented PA6/MXD6 by Double Bubble Tubular Film Process
  20. PPS News
  21. PPS News
  22. Seikei-Kakou Abstracts
  23. Seikei-Kakou Abstracts
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