Because the anodic film generated by the anodising process is transparent, any defects in the underlying aluminium substrate will remain visible after anodising.
The use of poor quality metal and/or poor quality anodising will result in panel gloss or colour variations or poor surface quality which can ruin the finished product – whether viewed from close or long range.
For example, in many Asian countries – where no continuous anodising capabilities exist -, anodising was, until recently, regarded as an inferior product. A combination of poor quality anodising on poor quality metal had always produced an inconsistent finish. Now Coil is rapidly changing all that by setting a new quality benchmark for anodised aluminium for architecural applications.
In order to ensure a perfect finish, the aluminium used must be free of surface defects and to ensure reproducability must have gloss levels which are totally consistent on a coil-to-coil and batch-to-batch basis.
For any product where the aluminium aspect is important, Coil exclusively employs Anodising Quality (AQ) aluminium, which is only available from a small number of European suppliers and a single Japanese supplier.
The added cost of an AQ substrate – where the metal supplier guarantees a perfect and consistent metal finish coil-to-coil and production batch-to-production batch – is essential to achieve Coil quality.
Coil has for 40 years worked in close collaboration with the leading quality metal suppliers in Europe to develop a world-class quality product. Coil is still, today, the only supplier of continuous anodising services to aluminium industry leaders such as Novelis, Hydro, Aleris and Constellium.