The reason that affects the surface tension of pe protective film

Many users imagine the use of PE protective film to be very simple, but it is not. Its use process, links, steps, including precautions, are relatively complicated, and it is the existence of this idea that makes the The effects of the film, such as the surface tension of the film, cannot be fully manifested. This property is important to the use of the membrane, affecting certain structures of the membrane itself. The following mainly talks about what factors affect the surface tension of the film. One: non-polar polymer, the surface free energy of the pe protective film is small, and the surface wet tension is low, generally about 30 dynes/cm. In theory, if the surface tension of the object is lower than 33 dynes/cm, ordinary inks or adhesives cannot be attached firmly, so the surface must be treated; two: polyester (PET, PBT, PEN, PETG) ) is a polar polymer with high surface free energy and surface wet tension above 40 dynes/cm. However, for high-speed color printing or to increase the bonding force between the vacuum aluminized layer and the surface of the BOPET film, it is also necessary to perform surface treatment on the BOPET film to further increase its surface wet tension; three: aluminized layer will occur during aluminum plating. Transfer, the transfer of the glue layer will occur when gluing the pe protective film. The main measure to prevent corona on the reverse side of the film is to adjust the pressure of the rubber pinch roller in front of the corona treatment roll, and the pressure at both ends of the pinch roll should be consistent and appropriate. When testing the surface tension of the PE protective film, we also need to carry out a strict dynamic and static balance test. The detailed test steps can be viewed in some ways, and the precautions must be understood. When we judge the surface tension of the membrane, we must first consider the influencing factors, so as to ensure that the use of the membrane will not be greatly affected, so that it can play a better role.