Decorated screens for use in motor vehicle instrument panels and door interior modules put high requirements on surface purity, optics and quality appearance. A German plastic processing plant supplemented its production of in mould decoration with decorative foils. In order to avoid surface defects due to dust particles, the foils are treated with ionised air and the mould fitting space is provided with a laminar pure air flow Through early co-operation with an injection moulding machine manufacturer as a system supplier it succeeded in integrating all necessary components into the injection moulding machine in a particularly short time.