Factors Affecting Surface Tension of Stretch Film

The surface tension of the wound film depends on the surface free energy of the film, and the surface energy of the wound film depends on the molecular structure of the film itself. Therefore, there are many factors affecting the surface tension of the wrapping film. So what are the influencing factors?

One factor is that polyester film is a polar polymer, and its surface free energy is high. For high-speed color printing or to increase the bonding force between the vacuum aluminized layer and the surface of the wrapping film, surface treatment is also required to further Increase its surface wet tension. Another factor is that if the surface free energy of the stretched film is small, the surface wet tension will be low, and ordinary inks or adhesives will not be able to adhere firmly, so the surface must be treated.

A relatively strict dynamic and static balance test can be carried out, which must be carried out when the surface tension of the stretched film is tested, so as to prevent the stretched film from being trapped in air and ensure that the plastic film enters the corona roll smoothly, thereby reducing the occurrence of the reverse corona phenomenon .