Six major characteristics for choosing PET protective films
2025/6/13 11:09:43 13
1. Transmittance: This point is rather difficult to identify with the naked eye. It is best to measure it with optical instruments. Another clumsy method is to cut a small piece of each type of protective film to be selected and place it in the middle of the computer desktop, then stick them out one by one. Then open a blank WORD file and check the whiteness (professionally speaking, it's called brightness) of the blank WORD files in the areas with and without the film or in different film areas. By comparing them separately, you can choose the brightest material, and its transmittance is the best protective film.
2. Haze: The haze should mainly be observed when the monitor is turned off. After different protective films to be selected are applied one by one, the more the screen background color is displayed, the smaller the haze will be. Of course, this material is better. If a black test board is used for this method, it will be easier to notice the difference. Another method is to turn on a fluorescent lamp in a slightly darker room. After removing the upper and lower release films of the protective film, hold it in your hand between your eyes and the light. Carefully observe if there is a layer of fog-like substance evenly distributed inside the protective film. That is the culprit affecting the haze. The more severe the fog-like substance is, the greater the haze and the poorer the material. Conversely, the worse it is, the better it is. Note that haze can affect transmittance, but it is a different concept from transmittance!
3. Static electricity Since LCD monitors are sensitive devices and are afraid of static electricity, the static electricity should be as small as possible when applying protective films. The testing method is to prepare the protective film to be tested (three-layer or two-layer material), smoke a cigarette and sprinkle some ash on the table, or get some fine paper scraps on the table, then remove the top layer of the protective film (this step is for three-layer material), and then remove the protective film with the silicone layer. When removing this protective film, immediately bring the use layer (silicone surface) close to cigarette ash or paper scraps to see if the protective film will adsorb these substances onto the silicone layer of the protective film and whether the adsorption is strong. The stronger the static electricity, the higher the static electricity generated by this material and the poorer the quality of the material. Conversely, the weaker the static electricity, the better. As far as I know, in the entire market, only the entire series of materials from Fujifilm Kopin in Japan will not be adsorbed at all, and they belong to the anti-static electronic grade materials.
4. Scratch resistance: This is the point that everyone is most concerned about and it is also a problem that most manufacturers have basically solved. Currently, the scratch resistance materials in the industry are basically the same (2-3 hours), with good properties. There is only a distinction between scratch-resistant and non-scratch-resistant. The standard method is to use a Japanese Sanling brand pencil with a hardness of 3H (available in stationery stores) to press and push it away at a 45-degree Angle with a force of 500G for 10 times. If there are no scratches, it is considered to meet the 3H hardness requirement. A simple method is to use a slightly hard metal part or a newly cut fingernail to scrape the surface of the material with the force of a regular stylus. If it is very easy to get scratched, it can be determined that it is not scratch-resistant. If there are no scratches, it can be determined that it has a scratch-resistant function. However, cutting and processing manufacturers should pay more attention to the uniformity of the scratch resistance of the entire piece or batch of materials, as some material manufacturers have not yet achieved adequate uniformity in coating.
5. Anti-fingerprint: Due to the increasing size of screens in recent years and the growing application of capacitive screens (which can be touched with fingers instead of the old-fashioned resistive screens that require pen strokes) on more and more smart phones, protective films are increasingly needed to have anti-fingerprint functions. Nowadays, such products are increasingly expected by more and more customers.