It is known that it is possible to improve adhesion of coatings, including metallization, by using any of a variety of surface treatments on polymer substrates. It is also known that the surface treatment can be optimized to give maximum adhesion. But if the treatment is not optimized, the adhesion will be lower. This includes being able to over-treat the surface and lose some, if not all, of the benefits of the surface treatment. The expectation has been that some of these surface treatments may be cumulative and that it is possible to over-treat the film because of the combination of more than one surface treatment. As most metallized processes are onto either oriented polypropylene (OPP) or polyethylene teraphthalate (PET) experiments were conducted on samples of each polymer type.
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