Numerical Simulation of Extrusion Coating
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S. Devisme
Abstract
In packaging industry, many structures are produced by extrusion coating. In this process, a polymer film is extruded through a slit die, then stretched in air, coated on a substrate (paper, aluminium or steel foil) between a chill roll and a flexible pressure roll, and finally cooled on successive chill rolls. Due to their non-polar character, polypropylenes are not suitable for extrusion coating on metallic surfaces. Adhesive properties can be improved by grafting on the polymer chain a polar group like maleic anhydride which may react with the aluminium surface.
Our purpose was to develop a general model in order to predict the temperature field in the thickness of the multilayered structure along the stretching, laminating and cooling steps, and especially near the polymer/metal interface. This model includes crystallization kinetics and accounts carefully for the heat transfer coefficient with the successive rolls and surrounding air. Its predictions have been successfully compared to experimental temperature measurements along the coating line for various processing conditions (velocity, roll temperature, etc). Moreover, thermal history has a real impact on structure and morphology in the film. All these aspects are revealed by microscopic observations of thin microtomed sections of the film and X-ray diffraction experiments. Finally, adhesion properties of the laminate have been tested for the same process conditions. A good correlation has been established between adhesion properties and the thermal history experienced by the grafted polypropylene near the interface with aluminium before crystallization.
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© 2007, Carl Hanser Verlag, Munich
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- International Polymer Processing Special Issue: European Coating Symposium 2005, University of Bradford, UK
- Invited Papers
- Coating and Polymer Processing
- Practical Limitations to Carrier Layer Formation on Inclined Planes
- Simulation of 3D Crystallization of Colloidal Nanoparticles on a Substrate during Drying
- Asymmetric Surface Roughness Formationon Moving Non-isothermal Liquid Coatings
- Inkjet Printing of Conductive and Resistive Coatings
- Moisture Sorption and Transport in Polylactide
- 10.3139/217.0992
- Review Article
- Welding of Plastics: Fundamentals and New Developments
- Regular Contributed Articles
- Numerical Simulation of Viscous Flow in a Partially filled Co-rotating Twin Screw Extruder
- Invited Papers
- A New Calculation Model and Optimization Method for Maddock Mixers in Single Screw Plasticising Technology
- Regular Contributed Articles
- Residual Wall Thickness Distribution at the Transition and Curve Sections of Water-assisted Injection Molded Tubes
- Numerical Simulation of Extrusion Coating
- Correlation between Injection Molding Parameters, Morphology and Mechanical Properties of PPS/SEBS Blend Using Artificial Neural Networks
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- International Polymer Processing Special Issue: European Coating Symposium 2005, University of Bradford, UK
- Invited Papers
- Coating and Polymer Processing
- Practical Limitations to Carrier Layer Formation on Inclined Planes
- Simulation of 3D Crystallization of Colloidal Nanoparticles on a Substrate during Drying
- Asymmetric Surface Roughness Formationon Moving Non-isothermal Liquid Coatings
- Inkjet Printing of Conductive and Resistive Coatings
- Moisture Sorption and Transport in Polylactide
- 10.3139/217.0992
- Review Article
- Welding of Plastics: Fundamentals and New Developments
- Regular Contributed Articles
- Numerical Simulation of Viscous Flow in a Partially filled Co-rotating Twin Screw Extruder
- Invited Papers
- A New Calculation Model and Optimization Method for Maddock Mixers in Single Screw Plasticising Technology
- Regular Contributed Articles
- Residual Wall Thickness Distribution at the Transition and Curve Sections of Water-assisted Injection Molded Tubes
- Numerical Simulation of Extrusion Coating
- Correlation between Injection Molding Parameters, Morphology and Mechanical Properties of PPS/SEBS Blend Using Artificial Neural Networks
- PPS News
- PPS News
- Seikei-Kakou Abstracts
- Seikei-Kakou Abstracts