Corona treatment uses the air that is already present (ambient air), and is interesting for many materials from a chemical point of view because of the oxygen based groups (blue groups in the figure below). Where Corona uses the uncontrolled atmosphere that is all around us, Grafting uses a 100% controlled nitrogen based atmosphere, which creates nitrogen based groups on the surface (red groups in the figure below).
iPlasma Grafting works with a nitrogen based atmosphere that can be mixed with other gases, known as dopants, to create other groups, or tune the quantity of the desired Amine, Amide and Imide groups. For example, higher quantities of Amine groups can be created by adding different dopants, and thereby reducing the Amide and Imide groups. This makes it is possible to tune the chemistry on the surface, not only to achieve good adhesion, thanks to high dyne levels, but also to create chemical bonds to inks and adhesives that requires this environment. The figure below, illustrates how each of the Nitrogen molecule groups are created, depending on the composition of the nitrogen based atmosphere.
What makes iPlasma Grafting so unique, is its highly controlled and monitored atmosphere. Unlike older technologies, which have been on the market since the 1990s, iPlasma technology is fully controlled and can be used in large-scale production systems as well as lab sized equipment. We can tune the chemistry in any direction required, and some of the different and proven recipes are shown below.