Atmospheric pressure plasma pretreatment is one of the most efficient plasma processes for cleaning, activating or coating plastics, metals, (e.g., aluminum), glass, recycled materials and composite materials.
During ultrafine cleaning with Openair® plasma (plasma cleaning), surfaces are gently and safely cleaned of release agents and additives and sterilized (plasma sterilization), while plasma activation makes later adhesion of glues and coatings possible. By using the nanocoating PlasmaPlus® (plasma coating), functionalized surface characteristics can also be produced that meet special product requirements.
Corona treatment is a high frequency discharge that increases the adhesion of a plastic surface.
The set-up of a corona discharge system generally consists of one or several high-voltage electrodes arranged at a distance of between 1 to max. 12 mm from a grounded roller. If a high voltage is applied to the electrodes, a corona discharge occurs in the gap between the electrodes and the roller, and a plasma is formed.More about corona surface treatments
The treatment is effected by direct exposure of the substrate to a gas flame for a short period of time. The flame carries some excess oxygen, which takes part in the combustion, building intermediate products in form of active ions such as hydroxyl and carboxyl groups. These ions are bound into the surface, thus building polar groups, which enable a reaction with the coating to be applied.
The surface ,which is nonpolar by nature, becomes polar and can be bonded with ink, varnish, adhesion etcetera.Therefore, flame treatment is not a heat application, but the controlled use of a chemical property of the flame.Read more
Low pressure plasma
These plasmas are generated in closed chambers in a vacuum (10-3 to 10-9 bar). The decreased particle count per volume in comparison to atmospheric pressure leads to a greater free travel length and to a comparatively lower number of impact processes. Therefore the plasma has a lower tendency to relax and can spread more widely in the space. Strong pumps are necessary for evacuating the chamber. Low pressure plasma does not have inline capability.