The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform
Fabrice Chopinez - One of the best experts on this subject based on the ideXlab platform.
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Adhesion in Polypropylene/Aluminum Laminates Made by Extrusion Coating
Journal of Applied Polymer Science, 2009Co-Authors: Samuel Devisme, Jean-françois Agassant, Jean-marc Haudin, Damien Rauline, Robert Combarieu, Fabrice ChopinezAbstract:The purpose of this article is to study how processing parameters can promote adhesion in grafted polypropylene/aluminum laminates made by Extrusion Coating. The density of bonds created at the interface is quantified by Xray spectroscopy after dissolution of the polymer film. dynamic mechanical analysis (DMA) and tensile tests are performed to characterize the mechanical properties of polymer films. They are linked with the crystalline structure, as revealed by optical microscopy and X-ray diffraction. A numerical model of Extrusion Coating is used to quantify the impact of cooling conditions on adhesion. A good correlation is found between the temperature history, the formation of bonds, and the mechanical properties of the polymer films. High temperature conditions can improve adhesion by increasing the open time for the reaction and the rate of the chemical reaction between grafted polymer chains and aluminum. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 2609-2624, 2009
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Numerical simulation of Extrusion Coating
International Polymer Processing, 2007Co-Authors: Samuel Devisme, Jean-françois Agassant, Jean-marc Haudin, Damien Rauline, Fabrice ChopinezAbstract: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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Contribution of Thermal Modelisation to Understand adhesion Mechanisms in Extrusion Coating: Case of Polypropylene on Aluminium
2006Co-Authors: Samuel Devisme, Jean-françois Agassant, Jean-marc Haudin, Damien Rauline, Fabrice ChopinezAbstract:Abstract A multilayered structure (polypropylene/grafted polypropylene/aluminium) manufactured by Extrusion Coating has been studied. The polypropylene film is extruded through a slit die, slightly stretched in air, coated on an aluminium foil in a laminator consisting of a chill roll and a flexible pressure roll, and finally cooled on successive chill rolls. Adhesive prope rties of polypropylene can be improved by grafting maleic anhydride on the polymer chain which may react with the aluminium surface. The reaction kinetic is more important for high temperature conditions. The aim of this study is to characterize how process parameters can promote adhesion in multilayered structures made by Extrusion Coating. A model including crystallization has been developed to predict the temperature during stretching in the air and then during cooling on the chill roll. This model describes the film dimensions, the temperature along the process and especially where the polymer crystallizes. Results are in agreement with measurements of the surface temperature at different locations along the process line. Moreover, thermomechanical 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 scattering. Finally, adhesion properties of laminate are linked with this thermomechanical history which depends on process parameters as polymer melt te mperature, line speed and chill roll temperatures.
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Contribution of Thermal Modelisation to Understand adhesion Mechanisms in Extrusion Coating: Case of Polypropylene on Aluminium
2006Co-Authors: Samuel Devisme, Jean-françois Agassant, Jean-marc Haudin, Damien Rauline, Fabrice ChopinezAbstract:A multilayered structure (polypropylene/grafted polypropylene/aluminium) manufactured by Extrusion Coating has been studied. The polypropylene film is extruded through a slit die, slightly stretched in air, coated on an aluminium foil in a laminator consisting of a chill roll and a flexible pressure roll, and finally cooled on successive chill rolls. Adhesive properties of polypropylene can be improved by grafting maleic anhydride on the polymer chain which may react with the aluminium surface. The reaction kinetic is more important for high temperature conditions.
Samuel Devisme - One of the best experts on this subject based on the ideXlab platform.
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Adhesion in Polypropylene/Aluminum Laminates Made by Extrusion Coating
Journal of Applied Polymer Science, 2009Co-Authors: Samuel Devisme, Jean-françois Agassant, Jean-marc Haudin, Damien Rauline, Robert Combarieu, Fabrice ChopinezAbstract:The purpose of this article is to study how processing parameters can promote adhesion in grafted polypropylene/aluminum laminates made by Extrusion Coating. The density of bonds created at the interface is quantified by Xray spectroscopy after dissolution of the polymer film. dynamic mechanical analysis (DMA) and tensile tests are performed to characterize the mechanical properties of polymer films. They are linked with the crystalline structure, as revealed by optical microscopy and X-ray diffraction. A numerical model of Extrusion Coating is used to quantify the impact of cooling conditions on adhesion. A good correlation is found between the temperature history, the formation of bonds, and the mechanical properties of the polymer films. High temperature conditions can improve adhesion by increasing the open time for the reaction and the rate of the chemical reaction between grafted polymer chains and aluminum. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 2609-2624, 2009
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Numerical simulation of Extrusion Coating
International Polymer Processing, 2007Co-Authors: Samuel Devisme, Jean-françois Agassant, Jean-marc Haudin, Damien Rauline, Fabrice ChopinezAbstract: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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Contribution of Thermal Modelisation to Understand adhesion Mechanisms in Extrusion Coating: Case of Polypropylene on Aluminium
2006Co-Authors: Samuel Devisme, Jean-françois Agassant, Jean-marc Haudin, Damien Rauline, Fabrice ChopinezAbstract:Abstract A multilayered structure (polypropylene/grafted polypropylene/aluminium) manufactured by Extrusion Coating has been studied. The polypropylene film is extruded through a slit die, slightly stretched in air, coated on an aluminium foil in a laminator consisting of a chill roll and a flexible pressure roll, and finally cooled on successive chill rolls. Adhesive prope rties of polypropylene can be improved by grafting maleic anhydride on the polymer chain which may react with the aluminium surface. The reaction kinetic is more important for high temperature conditions. The aim of this study is to characterize how process parameters can promote adhesion in multilayered structures made by Extrusion Coating. A model including crystallization has been developed to predict the temperature during stretching in the air and then during cooling on the chill roll. This model describes the film dimensions, the temperature along the process and especially where the polymer crystallizes. Results are in agreement with measurements of the surface temperature at different locations along the process line. Moreover, thermomechanical 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 scattering. Finally, adhesion properties of laminate are linked with this thermomechanical history which depends on process parameters as polymer melt te mperature, line speed and chill roll temperatures.
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Contribution of Thermal Modelisation to Understand adhesion Mechanisms in Extrusion Coating: Case of Polypropylene on Aluminium
2006Co-Authors: Samuel Devisme, Jean-françois Agassant, Jean-marc Haudin, Damien Rauline, Fabrice ChopinezAbstract:A multilayered structure (polypropylene/grafted polypropylene/aluminium) manufactured by Extrusion Coating has been studied. The polypropylene film is extruded through a slit die, slightly stretched in air, coated on an aluminium foil in a laminator consisting of a chill roll and a flexible pressure roll, and finally cooled on successive chill rolls. Adhesive properties of polypropylene can be improved by grafting maleic anhydride on the polymer chain which may react with the aluminium surface. The reaction kinetic is more important for high temperature conditions.
Jean-françois Agassant - One of the best experts on this subject based on the ideXlab platform.
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Origin of the Bubble Defect in the Extrusion Coating Process
Polymer Engineering and Science, 2011Co-Authors: Cyrille Sollogoub, Pierre Montmitonnet, Yves Demay, Jean-françois Agassant, Pascal DeparisAbstract:During the Extrusion Coating process, a polymer film is extruded through a flat die, stretched in air, then coated on a substrate (steel sheet in our case) in a laminator consisting of a chill roll and a flexible pressure roll. The nip, i.e., the area formed by the contact between the pressure and the chill rolls, constitutes the very heart of the Extrusion Coating process. Indeed, in this region, some of the most critical properties, such as adhesion, barrier properties, optical properties, are achieved. The thermomechanical analysis of Sollogoub et al., Polym. Eng. Sci., 48, 1634 (2008), was used to study the origin of the bubble defect appearing during the Extrusion Coating process. First, we investigate the influence of process parameters on the bubble defect. Then, we compute the thermomechanical parameters of the process, and finally, we derive a realistic bubble defect appearance criterion. POLYM. ENG. SCI., 00:000-000, 2010. ª2010 Society of Plastics Engineers
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Adhesion in Polypropylene/Aluminum Laminates Made by Extrusion Coating
Journal of Applied Polymer Science, 2009Co-Authors: Samuel Devisme, Jean-françois Agassant, Jean-marc Haudin, Damien Rauline, Robert Combarieu, Fabrice ChopinezAbstract:The purpose of this article is to study how processing parameters can promote adhesion in grafted polypropylene/aluminum laminates made by Extrusion Coating. The density of bonds created at the interface is quantified by Xray spectroscopy after dissolution of the polymer film. dynamic mechanical analysis (DMA) and tensile tests are performed to characterize the mechanical properties of polymer films. They are linked with the crystalline structure, as revealed by optical microscopy and X-ray diffraction. A numerical model of Extrusion Coating is used to quantify the impact of cooling conditions on adhesion. A good correlation is found between the temperature history, the formation of bonds, and the mechanical properties of the polymer films. High temperature conditions can improve adhesion by increasing the open time for the reaction and the rate of the chemical reaction between grafted polymer chains and aluminum. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 2609-2624, 2009
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Thermomechanical analysis and modeling of the Extrusion Coating process
Polymer Engineering and Science, 2008Co-Authors: Cyrille Sollogoub, Yves Demay, Jean-françois Agassant, Pascal Deparis, Eric Felder, Nathalie MiklerAbstract:During the Extrusion Coating process, a polymer film is extruded through a flat die, stretched in air, and then coated on a substrate (steel sheet in our case) in a laminator consisting of a chill roll and a flexible pressure roll. The nip, i.e. the area formed by the contact between the pressure and the chill rolls, constitutes the heart of the Extrusion Coating process. Indeed, in this region, some of the most critical properties, such as adhesion, barrier properties, optical properties, are achieved or lost. In this article, we first present an experimental investigation of the Coating step, which enables to characterize the leading thermomechanical phenomena. It is shown that there is no polymer macroscopic flow in the nip, but a local flow within the asperities of the steel substrate surface. This microscopic flow, at the interface between the film and the substrate, is slowed by strong cooling conditions in the nip. Several models are then proposed, giving access to the temperature profile through polymer thickness and substrate, the pressure distribution in the nip as well as the behavior of the polymer melt in the nip at the interface with the substrate
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Numerical simulation of Extrusion Coating
International Polymer Processing, 2007Co-Authors: Samuel Devisme, Jean-françois Agassant, Jean-marc Haudin, Damien Rauline, Fabrice ChopinezAbstract: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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Contribution of Thermal Modelisation to Understand adhesion Mechanisms in Extrusion Coating: Case of Polypropylene on Aluminium
2006Co-Authors: Samuel Devisme, Jean-françois Agassant, Jean-marc Haudin, Damien Rauline, Fabrice ChopinezAbstract:Abstract A multilayered structure (polypropylene/grafted polypropylene/aluminium) manufactured by Extrusion Coating has been studied. The polypropylene film is extruded through a slit die, slightly stretched in air, coated on an aluminium foil in a laminator consisting of a chill roll and a flexible pressure roll, and finally cooled on successive chill rolls. Adhesive prope rties of polypropylene can be improved by grafting maleic anhydride on the polymer chain which may react with the aluminium surface. The reaction kinetic is more important for high temperature conditions. The aim of this study is to characterize how process parameters can promote adhesion in multilayered structures made by Extrusion Coating. A model including crystallization has been developed to predict the temperature during stretching in the air and then during cooling on the chill roll. This model describes the film dimensions, the temperature along the process and especially where the polymer crystallizes. Results are in agreement with measurements of the surface temperature at different locations along the process line. Moreover, thermomechanical 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 scattering. Finally, adhesion properties of laminate are linked with this thermomechanical history which depends on process parameters as polymer melt te mperature, line speed and chill roll temperatures.
Rafael J. Taboryski - One of the best experts on this subject based on the ideXlab platform.
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Replication of micro-sized pillars in polypropylene using the Extrusion Coating process
Microelectronic Engineering, 2017Co-Authors: Nastasia Okulova, Peter Johansen, Lars Christensen, Rafael J. TaboryskiAbstract:A recent advancement in nano-pattern replication using roll-to-roll Extrusion Coating (R2R-EC) shows potential for many biomimetic applications. For further development of the technique a study of the micro-replication regime is carried out. In this study a full and partial replication in polypropylene (PP) of micro-sized pillars has been demonstrated using the Extrusion Coating process. The replication fidelity of the pillars is investigated in a systematic variation of different process parameters: the line-speed of the rolls, the extruder output, the cooling roll temperature and the pressure on the cooling roll. The parameter making biggest impact on the replication is the temperature of the cooling roll.The micro-sized pillars show replication behavior opposite to what was found previously for the nano-patterns. The larger structures take the time to fill in and replicate best at the lower speeds. In this article a direct comparison of the speed at the same Coating thickness is conducted. Display Omitted Full replication of micro pillars in roll to roll Extrusion Coating demonstrated.The cooling roll temperature has biggest impact on micro-replication during R2R EC.Line speed has an opposite effect on the micro-replication, then nano-replication.
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Fabrication of Large Area Broadband and Omnidirectional Antireflective Transparent Foils by Roll‐to‐Roll Extrusion Coating
Macromolecular Materials and Engineering, 2017Co-Authors: Swathi Murthy, Henrik Pranov, Henrik Chresten Pedersen, Mikkel Rønne Lotz, Nikolaj Agentoft Feidenhans'l, Morten Hannibal Madsen, Rafael J. TaboryskiAbstract:This study investigates the fabrication and performance of broadband and omnidirectional antireflective polymer foils, in the visible spectrum (400–800 nm), consisting of subwavelength inverted moth-eye structures. The foils are fabricated by a high throughput roll-to-roll Extrusion Coating process allowing structuring on both sides at a rate of 60 m min−1, with web width 45 cm. The highest average transmittance obtained in the visible spectrum is (98 ± 1) %; compared with (92 ± 1) % for the unstructured foil. The antireflective foil shows no significant difference in transmittance between normal incidence and incidence up to at least 60°. The foil performance is also investigated for different depths (Dp) and shapes of structures. The transmittance initially increases with Dp and reaches a maximum at Dp ≈ 120 nm. For process parameters yielding greater depths, other shape factors also play a critical role in the foil's antireflective properties.
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Replication of nanopits and nanopillars by roll-to-roll Extrusion Coating using a structured cooling roll
Journal of Vacuum Science & Technology. B. Nanotechnology and Microelectronics: Materials Processing Measurement and Phenomena, 2016Co-Authors: Swathi Murthy, Henrik Pranov, Henrik Chresten Pedersen, Rafael J. TaboryskiAbstract:This paper investigates a novel, very high throughput, roll-to-roll (R2R) process for nanostructuring of polymer foils, called R2R Extrusion Coating. It has the potential to accelerate the integration of nanostructured materials in consumer products for a variety of applications, including optical, technical, and functional surfaces and devices. In roll-to-roll Extrusion Coating, a molten polymer film is extruded through a flat die forming a melt curtain, and then laminated onto a carrier foil. The lamination occurs as the melt curtain is pressed between a cooling roller and a counter roller. By mounting a nanostructured metal shim on the surface of the cooling roller, the relief structure from the shim can be replicated onto a thermoplastic foil. Among the benefits of Poil, the process are availability of a wide range of commercial extruders, off-the-shelf Extrusion grade polymers, functional additives, polymeric materials with good diffusion barrier properties, and the overall maturity of the technology...
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Superhydrophobic Properties of Nanotextured Polypropylene Foils Fabricated by Roll-to-Roll Extrusion Coating
ACS Macro Letters, 2016Co-Authors: Agnieszka Telecka, Henrik Pranov, Swathi Murthy, Ling Schneider, Rafael J. TaboryskiAbstract:We demonstrate the use of roll-to-roll Extrusion Coating (R2R-EC) for fabrication of nanopatterned polypropylene (PP) foils with strong antiwetting properties. The antiwetting nanopattern is originated from textured surfaces fabricated on silicon wafers by a single-step method of reactive ion etching with different processing gas flow rates. We provide a systematic study of the wetting properties for the fabricated surfaces and show that a controlled texture stretching effect in the R2R-EC process is instrumental to yield the superhydrophobic surfaces with water contact angles approaching 160° and droplet roll-off angles below 10°.
Sara Khayyami - One of the best experts on this subject based on the ideXlab platform.
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Predicting Mechanical Properties of Polymer Films after Extrusion Coating using Supervised Machine Learning Algorithms
2019Co-Authors: Sara KhayyamiAbstract:Tetra Pak is a world leader in providing innovative packaging solutions and processing technologies and has been so for a very long time. It is well – known that the material used for packaging purposes gets subjected to high temperature and pressure during folding and filling which could compromise the integrity of the material. The polymer layer in the packaging material acts as a barrier, and thus a break in the polymer layer will influence the barrier properties. The process by which the polymer layer is applied on to the paperboard is called Extrusion Coating. The barrier properties of the polymer are affected by the process conditions in the extruder. It is therefore important to understand how the processing affects the mechanical properties of the polymer and hence the barrier properties. In this thesis, polyethylene films are created by varying the process settings, line speed and melt temperature, in the extruder. The mechanical properties are measured by the use of tensile tests and the effect from processing on the mechanical properties are investigated. A model for predicting the mechanical properties of polymer films is built using the collected data. The primary tool for data processing used in this thesis is Python, and the predictive model is built using machine learning algorithms. In the data, there is clear and visible effect from line speed on the mechanical properties but effect from melt temperature is not as strong. The predictive capacity of the simplest model based on linear regression has been found to predict with highest accuracy. Predictive models built on random forest regression has also been found to predict fairly well. The complex models are overall sensitive and require more data than was collected in this study to provide reliable predictions. (Less)
