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Use the laser engraving machines to achieve laser cleaning, laser post-melting and roughness control of the anilox rolls.

Jin, H. (2015) Use the laser engraving machines to achieve laser cleaning, laser post-melting and roughness control of the anilox rolls.

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Abstract:The report includes five parts. The first chapter, introduction, introduces the general information about Apex and the process of flexographic printing. In this part, different types of anilox rolls are described, including the representing parameters. Second chapter is the preparation. Here I introduced the laser sources in Apex, and a simulation tool called "Matlab Laser Toolbox" developed by professors in University of Twente, which could be used to simulate the temperature profile of the material surface during laser treatment. For this tool, I also introduced the thermal properties and light absorbance of the ceramic and inks. Unfortunately, this tool was proved not suitable for the projects in Apex and was not used and shown in the final experiments and report. I also developed an excel calculator to calculate the focus diameter of the laser beam. This excel file would be attached in the final report package. Chapter 3 is the design and results of the experiments for laser cleaning. The purpose of this project is to use laser to clean the inks on the used anilox rolls, without damaging the ceramic surface and cell structures. At the end some improvements and prospects were proposed. Chapter 4 is the design and results of the experiments for laser post-melting. Same trial and error tests were made to select out the most suitable laser treatment parameters. Chapter 5 is about the project of the roughness change by laser treatment. The roughness measurement device was introduced together with the measurement parameters. A Series of comparison test were made to investigate the relation between the laser treatment and the roughness. Experiments data, including the excel file "beam diameter calculator". "Roughness test" data, all the pictures and micro-images in the first two projects, would be arranged into a data package.
Item Type:Internship Report (Master)
Clients:
APEX, the Netherlands
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Sustainable Energy Technology MSc (60443)
Keywords:Anilox roll, Laser cleaning, Laser post-melting, Roll roughness
Link to this item:http://purl.utwente.nl/essays/69204
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