1. The used glue ratio is not suitable or not good, resulting in a large amount of residual glue and degumming when the protective film is removed.

2. The protective film has no corona or insufficient corona, resulting in poor adhesion of the adhesive layer to the protective film. When peeling off the film, the adhesive force between the adhesive layer and the board is greater than the adhesive force between the adhesive layer and the original film, and degumming and transfer phenomenon occurs.

3. The adhesive force is not matched, and the adhesive force between the adhesive surface of the protective film and the surface of the product is too high, so that the adhesive layer is destroyed, separated from the PE film, and degummed.

4. There are residual solvents on the surface of the object to be affixed that can react with the adhesive layer of the protective film, making the protective film difficult to tear or degumming.