Epoxy-paint stripping using TEA CO₂ laser: Determination of threshold fluence and the process parameters

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• 作者：Manoj Kumar ; P. Bhargava ; A.K. Biswas ; Shasikiran Sahu ; V. M ; loi ; M.O. Ittoop ; B.Q. Khattak ; M.K. Tiwari ; L.M. Kukreja
• 关键词：Laser paint stripping ; TEA CO2 laser ; Epoxy paint
• 刊名：Optics and Laser Technology
• 出版年：2013
• 出版时间：March, 2013
• 年：2013
• 卷：46
• 期：Complete
• 页码：29-36
• 全文大小：1038 K

文摘

It is shown that the threshold fluence for laser paint stripping can be accurately estimated from the heat of gasification and the absorption coefficient of the epoxy-paint. The threshold fluence determined experimentally by stripping of the epoxy-paint on a substrate using a TEA CO₂ laser matches closely with the calculated value. The calculated threshold fluence and the measured absorption coefficient of the paint allowed us to determine the epoxy paint thickness that would be removed per pulse at a given laser fluence even without experimental trials. This was used to predict the optimum scan speed required to strip the epoxy-paint of a given thickness using a high average power TEA CO₂ laser. Energy Dispersive X-Ray Fluorescence (EDXRF) studies were also carried out on laser paint-stripped concrete substrate to show high efficacy of this modality.