If a plastic material is used as a print bearer there are a need of a special surface treatment to get a god and durable printing. The most used surface treatment technique for the moment is corona treatment. This kind of treatment has unfortunately showed not to be so durable in the long term. Plasma treatment which in this case uses different kind of gases in the treatment of polypropylene is shown as a more effective treatment in this project. When the plasma treated surface has been printed is the good quality last much longer and the adhesion between the ink and the surface is remained. To test this adhesion is for the moment a standard used (ASTM D3359). This standard has appeared unstable and dependent at many different factors, which gives a big variation in the test results. Because of this has new test methods been carried out to give a more even and more reliable result in the test of the adhesion.