How to control the warpage of PET protective film

In the production process of silicone PET protective film, due to the processing technology, it is stipulated that the warpage of the protective film must be a value, so how to control the warpage of the PET protective film, the first thing to know is:

The difference in the material itself, if the materials of the application layer and the bonding layer are different, the warpage is uncontrollable at this time, and the high tension will not be greatly improved. Generally, customers will not require too much.

The 2 is the above tension problem, which is suitable for the control of the same material base material. The thickness difference is not big, and it can be controlled according to the increase or decrease of the tension. This is very simple, but remember that the tension of the drying box should not be too small, otherwise it will cause invalid correction or generate bubbles.

The relative path of film penetration is different, which will change the size and even direction of bending deformation. The portions of the left and right film sheets before and after entering the bonded wheel are changed according to the change angle warp. This method is common. However, due to the reasons of the machine itself, some coating lines do not have adjustment rollers, which need to be modified.

The 4 is that the substrate itself is tight and loose, and the key role of the film is reflected. At this time, the upper and lower sides of the finished product will warp inconsistently, and the serious ones will be overloaded. It is recommended to change the substrate only, there is no other way.

The 5 is that the air pressure on the upper and lower sides of the drum is inconsistent, which mainly affects the warping on both sides of the finished product, which can be solved by changing the standard air pressure of the cylinder.

Note: The pressure of the film film pressure wheel should be small, and the pressure of the thick film film must be large.