Cast Film Extrusion
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Abstract
Cast film extrusion is a widely used technique to produce polymer films for packaging or coating applications. The final width of the film may be smaller than the initial die width (necking phenomenon) and therefore is the final film thickness larger than what one could expect. Moreover it is heterogeneous (in terms of showing a larger thickness along the borders, also called dog bone defect). Above a critical draw ratio between the chill roll and the die both width and thickness fluctuations are observed (Draw Resonance Instability). All these phenomena limit the productivity of the process.
This paper provides an overview of the processing and material parameters governing the development of these geometrical defects and instabilities. Numerical models capturing the main experimental features are proposed, allowing to investigate process modifications in order to limit the development of these defects.
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© 2005, Carl Hanser Verlag, Munich
Articles in the same Issue
- Contents
- Contents
- Editorial
- International Polymer Processing Special Issue Macro 2004
- Invited Paper
- A Dilatometer to Measure the Influence of Cooling Rate and Melt Shearing on Specific Volume
- Monitoring Reactive Processes along the Extruder
- Stretch and Shape Distributions of Droplets with Interfacial Tension in Chaotic Mixing
- Cast Film Extrusion
- Nozzle Injection of Physical Blowing Agents in the Injection Molding of Microcellular Foams
- Visualization Analysis of Asymmetric Fountain Flow Phenomenon in Injection Molding of Filler-reinforced Resins by Rotary Runner Exchange System
- In-process Monitoring of Micromoulding – Assessment of Process Variation
- Processing-induced Properties in Glassy Polymers
- Structure Development in Injection Molding: A 3D Simulation with a Differential Formulation of the Kinetic Equations
- Evolution of Morphology of iPP in Processing Conditions
- Regular Contributed Articles
- 3D Simulation of Gas Assisted Injection Molding Analysis of Primary and Secondary Gas Penetration and Comparison with Experimental Results
- Microcellular Injection Molding
- Effect of Material Species on Flash Generation of PPS/GF Composites
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
Articles in the same Issue
- Contents
- Contents
- Editorial
- International Polymer Processing Special Issue Macro 2004
- Invited Paper
- A Dilatometer to Measure the Influence of Cooling Rate and Melt Shearing on Specific Volume
- Monitoring Reactive Processes along the Extruder
- Stretch and Shape Distributions of Droplets with Interfacial Tension in Chaotic Mixing
- Cast Film Extrusion
- Nozzle Injection of Physical Blowing Agents in the Injection Molding of Microcellular Foams
- Visualization Analysis of Asymmetric Fountain Flow Phenomenon in Injection Molding of Filler-reinforced Resins by Rotary Runner Exchange System
- In-process Monitoring of Micromoulding – Assessment of Process Variation
- Processing-induced Properties in Glassy Polymers
- Structure Development in Injection Molding: A 3D Simulation with a Differential Formulation of the Kinetic Equations
- Evolution of Morphology of iPP in Processing Conditions
- Regular Contributed Articles
- 3D Simulation of Gas Assisted Injection Molding Analysis of Primary and Secondary Gas Penetration and Comparison with Experimental Results
- Microcellular Injection Molding
- Effect of Material Species on Flash Generation of PPS/GF Composites
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
