In the packaging industry, plastic film's or webs are finding more and more applications. The plastic film's today include many different materials and new permutations and combinations of materials are added. The only problem encountered by the industry is that of plastic adhesion. A major component of these problems is due to the fact that many plastics have chemically nonporous surfaces with low surface tension i.e. most plastics are hydrophobic and are not wet table. These properties result in secondary assembly and decorating concern - bonding, printing, coating and painting. Surface pretreatment on today's high performance engineering resins solve many adhesion problems while increasing bond strength performance.

As a general rule, acceptable bonding adhesion is achieved when the surface energy of a substrate is approximately 10 dynes/cm greater than the surface tension of the liquid.