Openair® plasma is a simple and environmentally friendly method of cleaning aluminum surfaces. Composite films are used in particular in the production of beverage and food packaging to keep the packaging gas-tight. Here, the films are lamintated with the aluminium foil (aluminum layer). The material is additionally coated with PE so the aluminum does not come directly in contact with the contents.
The aluminum in the film system is pretreated with Openair® plasma to ensure a reliable bond with the PE film. All organic substances, such as rolling oils, are split on the material surface during plasma cleaning and removed.
The annealing procedure still widely used in the industry is time- and energy-consuming as compared to Openair® plasma treatment. By contrast, with the Openair® procedure, the plasma system is integrated inline into the existing overall process. This makes plasma pretreatment especially cost-efficient.