Contact forces between two substances because of molecular interaction.
Essential factor for a good stability of laminates, prints, covers and bondings.
In particular the adhesion forces between the molecules of a substrate and of a deposition must be bigger than the internal adhesion forces between the molecules of the deposite.
It is a most important application of plasma treatment to increase the surface energy, i.e. the adhesion potential of a substrate.
For more information click ⇒ Adhesive strength
