Types and Functions of Car Window Films

[SanKingston]

There are four main types of car window films: coated and composite process films, dyed films, vacuum thermal evaporation films, and metal magnetron sputtering films. The functions of each type are as follows: 1. Coated and composite process films: Their primary function is to block intense sunlight. These films are early-stage products and basically do not provide heat insulation. They were initially called sun paper or tea paper. 2. Dyed films: Most dyed car films on the market use deep-dyeing technology, which involves adding heat absorbers through deep-dyeing to absorb infrared rays from sunlight for heat insulation. However, since they also absorb visible light, the visible light transmittance is insufficient, and their clarity is poor due to technological limitations. Another major weakness is that their heat insulation function degrades quickly, and they are prone to fading, though they are relatively cheaper. 3. Vacuum thermal evaporation films: These use vacuum thermal evaporation technology to evaporate an aluminum layer onto the substrate for heat insulation. These are typically referred to as metal films, offering long-lasting heat insulation. However, their clarity is not high, affecting visual comfort, and another major drawback is their high reflectivity. 4. Metal magnetron sputtering films: As of 2018, these represent the highest technology in glass films, developed in the late 1990s after multiple technological innovations. The magnetron sputtering process involves using advanced multi-chamber high-speed rotating equipment to uniformly sputter high-grade aerospace alloy materials like nickel, silver, titanium, and gold onto high-tension PET substrates with high speed and force, based on electric and magnetic field principles. Products made with magnetron sputtering technology not only have excellent metallic texture and stable heat insulation performance but also achieve clarity, low reflectivity, and long-lasting color that other processes cannot match.