First look at the degree of light transmission
This is difficult to identify with the naked eye, it is best to use optical instruments to measure, and a simpler method is to select a PE protective film to cut a small piece and put it in the middle of the computer desktop one by one, then create a new one on the computer. A blank WORD document, to see the extent of the WORD document blanking in the area where the film has no film and no film on the computer or in different film areas (professional point is called brightness). The contrast is the brightest material, and the transparency is the best protective film.
Second look at the haze
1. How does the protective film of PE protect the haze? First of all, when the display is turned off, the method is the same as above. After the protective films are sequentially pasted, the clearer the color of the computer display screen, the smaller the haze, and the smaller the haze, the better the material. It is easier to see the difference if you use a black test board.
2. In a slightly dark room, open a fluorescent lamp, remove the PE protective film from the upper and lower film, and hold it between the eyes and the light. Look carefully if there is a misty thing in the PE protective film. Uniform distribution inside, that is the culprit affecting the haze, the more serious this hazy thing, the greater the haze, the worse the material, the better the explanation; (note that haze will affect the penetration rate, but with Transmittance is two different concepts!)
Third, look at static electricity
Since the liquid crystal display is sensitive to static electricity, the static electricity is as small as possible when the protective film is attached. The test method is to prepare the PE protective film to be tested (3 layers or two layers of material), and smoke a cigarette to smoke the ash on the table. , or get some fine paper scraps on the table, then tear off the top protective film of the PE protective film (this step for the 3-layer material), then tear off the protective film of the silicone layer, tear off the PE When the film is protected, immediately use the layer (silicone surface) to get close to the soot or paper dust, and see if the protective film will adsorb these things on the silicone layer of the protective film. The stronger it is, the higher the static electricity generated by this material is, the worse the material is, and vice versa.
Fourth look anti-scratch
1. Whether PE protective film is scratch-resistant or scratch-proof is the most concerned issue for everyone. At present, the anti-scratch material on the market is basically the same (2-3H), the performance is also good, only scratch-proof and non-scratch-proof. The test method is to use a pencil with a hardness of 3H to push 10 times on the PE protective film at a 45-degree angle of 500 G. Without scratching, it is considered to be up to 3H hardness.
2. There is also a simple method, which uses a slightly hard metal device or a newly cut nail to scratch the PE protective film with the intensity of the usual stylus. If it is very easy to scratch, it is not scratch-resistant, no scratches. It can be determined that it has a scratch-proof function.
In recent years, many product screen sizes have become larger and larger, and more and more smart machines plus capacitive screens (using a finger to touch and different from the old-fashioned resistive screen to use pen points to draw) applications, PE protective film There is an increasing need for anti-fingerprint features.