Some material, such as plastics, have inert and non-porous chemical surfaces that make them non-receptive to the affixing of substrates such as printing inks, adhesives and coatings. Flame increases the surface tension (wettability) of the material so as to prepare it for subsequent applications like printing, painting, dyeing, gluing, coating, lacquering, adhesive tapes, metallisation, lamination and so on.
This process mainly consists in passing flame 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
