Why should the classification of protective films emphasize weather resistance

The protective film of PP appeared on the market earlier, with the chemical name polypropylene. It has no adsorption capacity and is usually adhered with glue. After tearing it off, it will leave a mark of glue on the screen, which will corrode the screen over time.
The characteristic of PVC protective film is that it has a soft texture and is easy to stick. However, this material is relatively thick and has poor transparency, making the screen appear blurry. After tearing it off, it will also leave adhesive marks on the screen. This material is also relatively simple and turns yellow and oil with changes in temperature, resulting in a shorter service life.
PET protective film is a common type of protective film on the market. Mobile phones and tablets use these three layers of PET protective film, chemically known as polyester film, which is characterized by a hard texture and resistance to scratching. Long term use will not turn yellow or oil like PVC materials. However, general PET protective films rely on electrostatic adsorption, which is relatively simple to foam and fall. However, even if they fall, they can be reused after washing in clean water.
AR protective film is one of the better known screen protective films on the market. AR is a composite material that is generally divided into three layers: silicone as the adsorption layer, PET as the middle layer, and the outer layer is a special treatment layer. The special treatment layer is generally divided into two types: AG treatment layer and HC treatment layer. AG is anti glare treatment, and frosted protective film adopts this treatment method. HC is hardness treatment, It is a processing method used for high transmittance protective film. The characteristic of this type of screen protective film is that the screen is not reflective, with a high transmittance (over 95%), and will not affect the flashing effect of the screen.
Among the many performance properties of protective films (viscosity, thickness, color, tensile strength, transmittance, etc.), one is called weather resistance, which, as the name suggests, refers to the ability to withstand environmental and climatic conditions. So why should protective films emphasize this attribute? What impact does weather resistance have on the quality of protective films.
During the use of the protective film, the finished product being protected will also be directly exposed to the sun for a period of up to six months to a year. During this process, there will generally be no fouling of the protective film, but its performance may change, and it may even require being confined in a container and drifting across the sea for several months. The environment encountered by the protective film is actually quite harsh.
The protective film has excellent mechanical functions, which are very suitable for the user's requirements such as mild tensile strength, elastic modulus, elongation, etc. When used, the protective film appears lazy on the surface of the maintained data, and has excellent adhesion function to the maintained data. During data transfer and processing, the maintenance film will not warp or fall.
The protective film has good weather resistance and adhesive stability. After several days or a long time of application, the peeling force does not increase significantly, and it is easy to remove. When removed, there is no residual adhesive or residue on the protected surface.
The protective film has shown outstanding performance in its center after being used for a period of time, but its two ends are raised. The main reason for this phenomenon is that the protective mold has a high degree of stretching during the pasting process of the maintained profile. After pasting, it exhibits unnecessary retraction in high temperature environments.