The fact that the topic of digital UV direct printing on non-polar plastics such as PE, PP, WPC, laminated MDF or recycled polymers is still current has been shown on the Inprint in April 2014. The increasingly new design and functional coatings for household appliances, such as glossy surfaces, anti-reflective and anti-fingerprint coatings are not only a new challenge for the printing of surfaces, they are already considered as being a high quality standard.
Several years ago, the company BSH Home Appliances changed the surface material from previously processed expensive ABS plastics to PP which is equally high quality but more cost-effective. The aim was an increase of the capacity with a simultaneous reduction in the production costs of immersion mixers. However, the printability of PP, especially printing with high resistance, turned out to be difficult. In order to print the rounded handles of the mixer in pad printing, a previous treatment of the PP surface is needed since a long-term stable adhesion of the printing ink can only be achieved by a high activation of the surface with plasma. A pretreatment with Openair® plasma not only creates optimal conditions for printing, it can also increase the quality of your products!