What is the development history of car window tint?

The redevelopment of car window film functions gave rise to the first generation of coating and composite technology in the 1960s, commonly known as tea paper film. The main function of this kind of film is to block light and basically does not insulate. Just like sunglasses, it can only change the visual light perception. Moreover, the clarity of the tea paper film is very low, and the formaldehyde odor is very serious. It is only suitable for passenger cars, excavators, etc., that are used to install goods.

The second generation is a dyed film using a dyeing process. This kind of membrane was produced in the 1970s. Most of the membranes currently on the market are deep dyeing processes. The deep dyeing method is used to add heat absorbers to absorb the infrared rays in the sun to achieve a heat insulation effect. Because it also absorbs visible light, the visible light transmittance is insufficient. Coupled with the limitations of the dyeing process itself, the clarity is relatively poor. Another major disadvantage of dyed film is that its thermal insulation function decays quickly, and it is easy to fade. Many dyed films will not only fade after a year and a half, but will no longer be insulated and may even blister, seriously affecting the visual appearance. This type of film is particularly suitable for instant heat insulation tests. 4S stores often use the characteristic of dyed films to absorb heat instantaneously to fool customers, so inferior dyed films sent by 4S stores must not be given.

In the late 1980s and early 1990s, the third generation of vacuum thermal evaporation process film, namely aluminized film, came out. The vacuum thermal evaporation process evaporates the aluminum layer on the substrate to achieve a heat insulation effect. This kind of film already belongs to the category of metal film and has relatively long-lasting heat insulation. However, its disadvantage is that it has poor clarity, which affects the comfort of the field of vision. Another major disadvantage is that it has high reflectivity, which produces light pollution and affects driving safety. In addition, the formaldehyde phenomenon still exists. Aluminized films are now mostly used in architectural films.

Nowadays, car window tint has developed into the fourth and fifth generation metal magnetron sputtering film, which is free from annoying TVOC pollution and has high heat insulation, high definition, high stability, and low reflective properties.