Laser engraving and laser marking of anodized aluminium
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Anodized and coloured anodized aluminium are ideal for inscribing or marking with laser. In this process the very hard approx. 8 - 30 µm protective anodic coating is not completely removed. The image contrast is produced by means of the change of colour in the oxide coating and almost photographic qualities can be achieved with over 600 dpi and up to 250 different grey scales. Special lacquer coatings can also be used to apply durable high-contrast contours or pictures to metallic surfaces, for example. Typical fields of application include high-quality markings for type plates, barcodes, logos, serial numbers etc., although the advertising media sector is coming to rely increasingly on this technology as well.