Multicolour coating layer on plastic films for interference filters - is produced on roll and has thin metal film, transparent varnish with varying thickness and final metal layer

摘要

Producing multicoloured reflecting interference colours on plastic films is claimed. The coating consists of a reflective metal layer vaporised onto a plastic film, a transparent varnish layer which is printed on and a translucent metal layer. Transparent varnish thickness is varied locally from 120-2000 nm to achieve the required multi-colour effects. Coatings can be applied to one or both sides of the plastic film. USE/ADVANTAGE - For continuous or semi-continuous prodn. of interference filters. Known technology e.g. offset printing, is used to apply the variable thickness varnish coating.