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One of the limitations of UV curing systems is the difficulty to get adherence on non porous
substrates. The goal of this study, carried out by Cray Valley, is to understand mechanisms of adherence of UV coatings and to propose guidelines for formulations of UV varnishes on plastic substrates. It has been shown (1,2) that a good wetting is necessary for adhesion and that adherence is mainly governed by two parameters:
the thermodynamical work of adhesion WT and a function of the coating network structure:
Wm = WT x f (coating network structure)
Adherence Wm represents the measured work required to separate the coating from the substrate,
whereas adhesion (WT) represents all the interfacial intermolecular interactions.
A more detailed equation explaining the function of coating network structure has been set up by
D. Perera (3) : he took into account the energy expanded in plastic deformation, the viscous dissipation and the
internal stress.
In this study, we will present the main parameters influencing the adherence tests and how to modify
the thermodynamical work of adhesion and the coating network structure in order to get good adherence
properties.
