How is the bonding process of protective film made

Protective film pasting process.
1. Determination of the direction of the protective film pasting steps. The protective film is generally composed of three layers, so when pasting, these three layers of protective film should be placed together on the screen surface to determine the pasting direction.
2. The cleanliness of the surface during the protective film pasting step is closely related to the normal use of the protective film. If the dirt on the surface is not completely removed, the protective film cannot fully contact the screen and is prone to detachment. Therefore, the second step is to use a fiber cloth to wipe away fingerprints, dust, oil stains, and dirt on the screen.
3. Protective Film Removal Method: When removing the protective film, first pinch the transfer sticker, then remove 1/3 of the protective mold instead of completely removing it. Then, face the exposed intermediate film towards the screen, carefully align it with the edge and gently stick it onto the screen. Then, slowly remove the entire protective film, and align all exposed intermediate films with the edge and stick it onto the screen.
4. Remove the bubbles in the protective film pasting step.
After completing the above steps, it will be found that there are many small bubbles in the protective film. At this time, it is necessary to use a flat scraper to remove the bubbles to prevent residue and reduce the effectiveness and service life of the protective film.
The principle of protective film adhesive (adhesive): a polymer with viscoelastic properties. Film application: The adhesive layer can be in close contact with the surface of the adhesive and flow into the grooves of the adhesive surface as much as possible, increasing the effective contact area. Film tearing: The adhesive layer has high peel resistance, and the higher the peel speed, the higher the peel strength of the pressure sensitive adhesive. Adhesive performance (adhesive):.
The main factors affecting the adhesion of the protective film are: wetting: Pressure sensitive adhesive can only achieve close contact with the surface of the adhered object by having good wetting, creating conditions for physical and chemical bonding. Molecular movement and diffusion: Pressure sensitive adhesive molecules will move towards the surface of the adhered material. When the distance between the two is less than 5A, biological, physical and chemical bonding will occur. Permeation: The adhesive layer flows and penetrates into the grooves and voids under a certain pressure, By increasing the contact area between the two, mechanical bonding force is generated between the adhesive and the material being adhered.
Surface treatment of substrate film: Corona treatment: Formation of polar reaction groups, formation of extremely fine pits, coating: Uniform coating of liquid adhesive on the substrate film, preliminary drying.