What Factors Affect The Tightness Of The Membrane

It should be known that winding film is used for packaging industry products, has a very good use effect, but the use effect of the product and its tightness has a very close relationship. So what factors can affect the tightness of the membrane?

1, polyester (PET, PBT, PEN, PETG) is a polar polymer, its surface free energy is high, surface wet tension in 40 dyne/cm above. However, for high-speed color printing or to increase the binding force between the vacuum aluminized layer and the surface of BOPET film, surface treatment of BOPET film is also needed to further improve its surface wet tension.

2, non-polar polymer, winding film surface free energy is small, surface wet tension is low, generally about 30 dyne/cm. In theory, if the surface tension of the object is less than 33 dyne/cm, ordinary ink or adhesive will not adhere firmly, so it is necessary to treat the surface;

3, aluminum plating will occur when the aluminum coating layer transfer, in the coating will occur when the coating layer transfer. The main measure to prevent corona on the reverse side of the winding film is to adjust the pressure of the rubber compression roller before the corona treatment roller, and the pressure at both ends of the compression roller should be consistent and the pressure size should be appropriate.

In fact, in the production process of winding film, there will also be the problem of too loose. We can know from the answers of professionals that the tightness of the winding film surface depends on the molecular structure of the film material itself, and the size of the free energy of the winding film surface determines whether the winding film has a good tightness. Therefore, the performance of all aspects of the winding film are related to each other, so no matter in the production or use of the winding film, must be in accordance with the provisions of the relevant operation, more matters needing attention to understand.

Therefore, through the above content, it can be seen that the tightness of the winding film is mainly affected by these factors, so whether you buy the product or use the product, you should pay more attention to this aspect.