Depending on the material chosen, the colour is applied to the roller shutter using a decorative film or extruded on the material. In the so-called extrusion process, the film is already applied to the PVC during production and fuses permanently with it. Coil coating, on the other hand, is used for aluminium: here, the colour is burnt in at around 240° C. Both processes protect the surface of the material and ensure that it is not damaged.