Investigation of the Cooling Jets Used in the Blown Film Process
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N. Gao
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.
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© 2005, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- New at International Polymer Processing
- Regular Contributed Articles
- Preparing of Homogeneous Solution of Ultrahigh Molecular Weight PAN
- Non-linear Viscoelastic Behavior of PVC Plastisol
- Algorithms for Two Gate Optimization in Injection Molding
- Viscoelastic Properties of Flexible Organic Fiber Composites
- Mold for Manipulation Microstructure Development
- Simultaneous Biaxial Stretching of PP Resins of Varying Tacticity
- Rotational Moulding of PVC Plastisol
- Drawability of As-spun PP Fibres
- Melt Fracture of Linear PE
- Investigation of the Cooling Jets Used in the Blown Film Process
- Non-linear Crystalline Spherulitic Growth Behavior for LLDPE
- Design Sensitivity Analysis for the Optimization of the Injection Molding Process
- Preparation and Characteristics of Reactive Blends of Phosphate-containing Maleimide and Epoxy
- Easy Tear Multilayer Film of Biaxially Oriented PA6/MXD6 by Double Bubble Tubular Film Process
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- New at International Polymer Processing
- Regular Contributed Articles
- Preparing of Homogeneous Solution of Ultrahigh Molecular Weight PAN
- Non-linear Viscoelastic Behavior of PVC Plastisol
- Algorithms for Two Gate Optimization in Injection Molding
- Viscoelastic Properties of Flexible Organic Fiber Composites
- Mold for Manipulation Microstructure Development
- Simultaneous Biaxial Stretching of PP Resins of Varying Tacticity
- Rotational Moulding of PVC Plastisol
- Drawability of As-spun PP Fibres
- Melt Fracture of Linear PE
- Investigation of the Cooling Jets Used in the Blown Film Process
- Non-linear Crystalline Spherulitic Growth Behavior for LLDPE
- Design Sensitivity Analysis for the Optimization of the Injection Molding Process
- Preparation and Characteristics of Reactive Blends of Phosphate-containing Maleimide and Epoxy
- Easy Tear Multilayer Film of Biaxially Oriented PA6/MXD6 by Double Bubble Tubular Film Process
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
