Optimisation of a paint coating ablation process by CO2 TEA laser: Thermal field modelling and real-time monitoring of the process

Coutouly, J.F.; Deprez, Paul; Breabăn, Florin; Longuemard, J.P.

doi:10.1016/j.jmatprotec.2009.06.001

Cited by 25 publications

(13 citation statements)

References 10 publications

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“…The stripping rates obtained were 150 cm 2 /min for FEP and 600 cm 2 /min for PTFE. In other studies similar to this work, using laser sources for removal of epoxy polyester or polyurethane paint values between 50 and 140 cm 2 /min have been obtained [34,36,49]. The fluoropolymers appear to show a low stripping rate compared to other polymer coatings.…”

Section: Discussionsupporting

confidence: 68%

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Study on the Main Influencing Factors in the Removal Process of Non-Stick Fluoropolymer Coatings Using Nd:YAG Laser

et al. 2019

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The coatings with fluoropolymer resins rich in fluorinated ethylene propylene (FEP) and polytetrafluoroethylene (PTFE) are applied as anti-adherent coatings on aluminum–magnesium substrates for use in food containers. In many cases, due to wear, they must be stripped for the application of a new coating on the same substrate. There are several processes for this: blasting, plasma, pyrolysis, chemical processes, laser, high pressure water, and combinations of these. This work focuses on the characterization of the main factors that condition the FEP coating removal process by a continuous wave (CW) Nd:YAG laser, and on the determination of the efficiency of this type of technology used for this purpose. Stripping surface per unit of time and energy consumption per unit area has been determined among other efficiency indicators. Regarding the characterization of the coating object of study, its thickness, surface roughness, contact angle, microhardness and absorbance-reflectance responses have been determined, and the results have been compared with those obtained in the case of PTFE. In addition, to evaluate the mechanical damage caused in the substrate after coating removal by (CW) Nd:YAG laser, the tensile strength, Vickers hardness, Ra and Rz roughness, and the substrate thickness have been measured and analyzed.

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Section: Discussionsupporting

confidence: 68%

“…Therefore, with the development of lasers that can be driven by high-power optical fiber, research on paint and coating stripping processes has received renewed attention. This is evident in various scientific investigations, culminating with the experimental and theoretical models recently published [33,34,35,36,37].…”

Section: Introductionmentioning

confidence: 96%

Study on the Main Influencing Factors in the Removal Process of Non-Stick Fluoropolymer Coatings Using Nd:YAG Laser

et al. 2019

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“…Frente a las anteriores, la eliminación de revestimientos como pinturas, barnices u óxidos, e incluso restos biológicos o restos de petróleo (Mateo et al, 2005;López et al, 2010) utilizando un haz láser, mediante el procedimiento conocido como ablación láser, es un proceso que tiene importantes ventajas en comparación con las técnicas convencionales de eliminación por medio de abrasivos, químicos o pirolítico (Flores et al, 1998;Duarte y Peças, 1998;Schmidt et al, 1999;Schmidt et al, 2000;Schmidt et al, 2003;Mongelli et al, 2005;Shuöcker y Bielak, 2007;Coutouly et al, 2009). Entre ellas, cabe destacar la posibilidad de eliminar la capa superficial sin dañar el sustrato o minimizando el daño, la supresión de productos químicos y la producción mínima de gases y vapores contaminantes (Freiwald et al, 1998;Marimuthu et al, 2010).…”

Section: Introductionunclassified

Ablación láser de recubrimientos de politetrafluoretileno (PTFE) aplicados sobre sustratos EN AW-5251

2014

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RESUMEN:En la actualidad se utilizan diversos sistemas de eliminación de recubrimientos ricos en politetrafluoretileno (PTFE) sobre sustratos metálicos: granallado, pirólisis, procedimientos químicos y combinaciones de ellos, presentando todos ellos serias dificultades. En el presente trabajo se propone el uso de ablación láser para eliminar recubrimientos ricos en PTFE que previamente han sido aplicados en chapas de la aleación de aluminio magnesio EN AW-5251 H34. Para ello se han analizado los valores del límite elástico convencional, resistencia a la tracción, alargamiento porcentual, energía retenida por impacto y dureza. También se ha evaluado la distribución del tamaño de grano a nivel microestructural, el tamaño medio de grano ASTM y la distribución de partículas constituyentes. Los estudios se han efectuado en tres etapas sucesivas de aplicación y eliminación láser del recubrimiento. De forma paralela, se determinan y se comparan las propiedades con los mismos sustratos y etapas, pero eliminados por pirólisis. De la comparación de los resultados se concluye que la eliminación por ablación láser no produce un empobrecimiento añadido de las propiedades de los sustratos y que puede convertirse en una alternativa industrial a los procedimientos de eliminación tradicionales. ABSTRACT: Laser ablation of polytetrafluoroethylene (PTFE) coatings applied on EN AW-5251 substrates.Currently the most common used methods for removing PTFE rich coatings on metal substrates are: grinding, pyrolysis, chemical processes or a combination of these. While effective, all present serious difficulties. In this paper the use of laser ablation to remove PTFE rich coatings, which have previously been applied to sheets of aluminum magnesium alloy EN AW-5251 H34, is proposed. For this purpose the values of the yield strength, tensile strength, percent elongation, impact energy retained and hardness are analyzed. Equally, the grain size distribution at the microstructural level, the ASTM average grain size and distribution of constituent particles have been evaluated. Measurements were performed to three successive stages of application and laser coating removal. Moreover, the previous set of properties have been determined for the same substrates and stages but using pyrolysis to remove the coating. Comparison of the results shows that the removal by laser ablation does not cause any reduction in the properties of the substrates and may become an industrial alternative to traditional disposal procedures.

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“…Compared with the above mentioned methods, removal of coatings such as paints, varnishes or oxides using a laser beam, known as removal by laser ablation or laser decoating [6][7][8][9][10][11][12][13], has important advantages. Among them, removing the surface layer without damaging the substrate, the elimination of chemical products and the minimum polluting gases and vapours production, can be highlighted [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Laser and pyrolysis removal of fluorinated ethylene propylene thin layers applied on EN AW-5251 aluminium substrates

Guerrero‐Vaca

Sevilla

Soriano

2015

Applied Surface Science

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Optimisation of a paint coating ablation process by CO2 TEA laser: Thermal field modelling and real-time monitoring of the process

Cited by 25 publications

References 10 publications

Study on the Main Influencing Factors in the Removal Process of Non-Stick Fluoropolymer Coatings Using Nd:YAG Laser

Study on the Main Influencing Factors in the Removal Process of Non-Stick Fluoropolymer Coatings Using Nd:YAG Laser

Ablación láser de recubrimientos de politetrafluoretileno (PTFE) aplicados sobre sustratos EN AW-5251

Laser and pyrolysis removal of fluorinated ethylene propylene thin layers applied on EN AW-5251 aluminium substrates

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