Experimental Investigation of the Cooling Flow in the Film Blowing Process
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F. Peters
Abstract
The film blowing process relies on external air cooling of the extruded polymer hose. The air is supplied by a ring nozzle surrounding the die. We investigate the flow as it emanates from a commercial nozzle by a laser light sheet method which reveals the instantaneous rather than the mean flow structure. Flow separation in the nozzle is diagnosed as well as a high degree of disturbances affecting the thermal boundary layer. To improve the flow a modified nozzle is investigated in the same way, which shows how separation is avoided and how the regular structure of a wall jet is attained. The limits of this approach are highlighted. The optical measurements are amended by pressure measurements inside and outside the nozzle. They show what the flow disturbances mean in terms of normal forces on the film.
References
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© 2006, Hanser Publishers, Munich
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- PPS News
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Articles in the same Issue
- Contents
- Contents
- Regular Contributed Articles
- New Multicomponent Compatibilization System for Polyolefin/Polystyrene Blends
- Preparation and Characterization of HMW PA 6 via Anionic Polymerization of ∊-Caprolactam by Using a Mixture of Di- and Tri-functional Chain Initiators
- Polymer Processing Extrusion Instabilities and Methods for their Elimination or Minimisation
- Microcellular Wood Fibre Reinforced PP Composites
- Effects of Take-up Speed of Melt Spinning on the Structure and Mechanical Propertiesof Maximally Laser Drawn PA9-T Fibers
- Description of the Pressure/Throughput Behavior of a Single-screw Plasticating Unit in Consideration of Wall Slippage Effects for Non-Newtonian Material and 1-D flow
- Study of Starch Gelatinization in a Flow Field Using Simultaneous Rheometric Data Collection and Microscopic Observation
- Analysis of the Residual Stresses in the Process of Nanoimprint Lithography
- The Reactive Extrusion of Thermoplastic Polyurethane and the Effect of the Depolymerization Reaction
- Simulation of Core Deflection in Powder Injection Molding
- Experimental Investigation of the Cooling Flow in the Film Blowing Process
- Study of the Compatibilizer Effect on Blends Prepared from Waste Poly(ethylene-terephthalate) and High Density Polyethylene
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
