Some material, like plastics, have inert and non-porous chemical surfaces that make them non-receptive to the anchoring of substrates such as printing inks, adhesives and coatings.
The flame increases the surface tension (wettability) of the material so as to prepare it for subsequent applications such as: printing, painting, dyeing, gluing, coating, lacquering, adhesive tapes, metallization, lamination and so on.
This process mainly consists in passing flame controlled (in composition, speed and distance) over the surface of the material to be treated. Flame treatment can be used to improve the adhesion capacity of all plastics as well as some non-plastic materials including aluminium, paper or metallised products generally
