Since the liquid crystal display is a sensitive device that is afraid of static electricity, the smaller the static electricity is, the better when the protective film is attached. The test method is to prepare the PE protective film (three-layer material or two-layer material) to be tested, and smoke a cigarette to light the soot on the desktop , Or get some small paper scraps on the desktop, and then tear off the top layer of PE protective film (this step is for 3 layers), then tear off the protective film of the silicone layer, and tear off this layer of PE When the protective film is used, immediately move the used layer (silica gel surface) close to the soot or paper dust to see if the protective film will adsorb these things on the silica gel layer of the protective film, and whether the adsorption is strong. The stronger it is, the higher the static electricity generated by this material, the worse the material, and vice versa.
Whether the polyethylene film is scratch-resistant and scratch-resistant is a problem that everyone is currently concerned about. At present, the scratch-resistant materials on the market are basically the same (2-3H) and have good performance. There are only scratch-resistant and non-scratch-resistant points. The test method is to use a pencil with a hardness of 3H and push it 10 times on the PE protective film with a force of 500G at a 45 degree angle. If there is no scratch, it is considered that the hardness requirement of 3H can be reached.
Another simple method is to use a slightly harder metal device or a newly cut nail to scratch the polyethylene film with the strength of a normal stylus. If it is very easy to scratch, it is deemed not to be scratch resistant, and it is fine if it is not scratched. Make sure it has scratch resistance. In recent years, the screen size of many products has become larger and larger, and more and more smart phones are equipped with capacitive screens (touch with fingers instead of old-fashioned resistive screens, which need to be drawn with a pen). Polyethylene film There is an increasing need for fingerprint protection.
