Why does the plastic surface protective film appear residual glue?
Mar 22, 2019
After the protective film is used, after the protective plastic surface protective film is uncovered, residual pressure-sensitive adhesive is found on the protected surface and cannot be easily removed. It not only destroys the aesthetics of the item, but also causes contamination of the material being protected. There are usually three cases of residual glue. First, cohesive failure: pressure-sensitive adhesive on the surface to be protected and the substrate, and the surface of the protective film is tarnished. Second, the adhesion of the adhesive base: the surface to be protected is more The rubber residue remains, and the surface of the protective film is visible on the substrate; thirdly, the migration residue: a small amount of pressure sensitive adhesive remains on the surface to be protected, and the gloss of the protective film is maintained well.
The reasons for the participation are more complicated, and different mechanisms have created the three cases of the above-mentioned residual glue. One of the more common reasons is that the peeling strength of the protective film changes after a period of time, and the protective material is attached to the plastic surface protective film. After that, it takes a while to uncover it. It is only a few minutes short, and the long one is more than one year, most of it is 3 to 12 months. During this time, the peeling strength of the protective film tends to be over time. The continuation increases, usually first fast and then slow, and finally stabilizes.
When the peel strength rises above the cohesive strength or the cohesive force, cohesive failure or sticking damage occurs, resulting in residual glue. Another reason is the aging of the protective film. The protective film is composed of a plastic substrate and a pressure sensitive adhesive, both of which are high molecular polymers. The aging mechanism mainly includes heat aging and ultraviolet aging. After the protective film is aged, the macromolecular chain constituting the substrate and the pressure-sensitive adhesive is broken, the average molecular mass is lowered, the cohesive strength is lowered, and cohesive failure occurs.
https://www.xmlfilm.com/
