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The effect of microscopic features upon the transmissivity of enclosed laser ablated laminated metallised polymer films |
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| Authors: | R. Stewart L. Li R. Isherwood |
| Affiliation: | a Laser Processing Centre, Department of Mechanical, Aerospace and Manufacturing Engineering, University of Manchester, Institute of Science and Technology (UMIST), P.O. Box 88, Manchester M60 1QD, UK b De La Rue Limited, Overton Mill, Overton, Hants, UK |
| Abstract: | A vacuum-deposited aluminium layer (20 nm) is sandwiched between two layers of laminated oriented polypropylene (OPP) film whose thickness varies from 20 to 40 μm. Selected areas of this sealed system were transparentised by the redistribution of the aluminium layer without breaking the seal or causing damage to the OPP film using a 75 W Q-switched Nd:YAG laser. The resultant transparentised films contain aluminium particles, distorted polymer areas and intact areas of the vacuum-coated aluminium layer. This paper investigates the effect of microscopic features upon the overall transmissivity of the laser-treated films and hence the quality of the transparentisation process. |
| Keywords: | Laser Ablation Aluminium Enclosed Nd:YAG Polymer Film Foil Confined |
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