Myth #1: In order to have a good heat insulation effect, deep-colored automotive insulation film should be purchased.
The truth: The first thing that must be made clear is that the darker-colored insulation film may pose a security risk because it will block the driver's eyesight. The automotive insulation film is divided into front and rear windshield films and side windshield films. The most demanding insulation film is the front windshield. Due to driving requirements, the front windshield has the highest requirements for light transmittance. According to the "Technical Conditions for the Safe Operation of Motor Vehicles" promulgated by the General Administration of Quality Supervision, Inspection and Quarantine and the National Standardization Administration, "The visible light transmittance of the front windshield is not allowed to be less than 70%." Therefore, the front windshield is particularly claustrophobic with a dark color film.
Insulation and heat insulation, in fact, is mainly due to the heat from solar radiation. The heat insulation effect is good or bad, we must first look at what causes the "hot" inside the car. There are three ways of heat transfer, heat conduction, heat radiation, and thermal convection. Obviously, thermal radiation has the most significant effect on the interior temperature, especially in summer. The main purpose of the car's thermal insulation film is to form an insulating layer on the car's glass to prevent heat from entering the car through the glass and increase the temperature inside the car. Sunlight can be divided into visible light, ultraviolet light and infrared light. Infrared, which accounts for 53% of the sun's energy, is the main source of heat and is the focus of thermal insulation. Visible light is the basis of human vision and is the light that should be preserved. Ultraviolet penetration, can make the skin melanin deposition, resulting in black skin, excessive UV exposure is likely to cause skin aging and disease, but also easy to make the car equipment fade aging, but also should be blocked as much as possible. In other words, the focus of automotive film is to isolate ultraviolet and infrared rays from the sun.
In the early days, the insulation film was mainly based on the dyeing process, and the color was used for heat insulation. The deeper the color was, the more effective it was. In fact, this method is not good. According to Peng Jianjun, technical manager of 3M China Research and Development Center, color insulation is due to the fact that colored paint can absorb light of a certain wavelength. This principle causes the film to absorb only part of the heat in the film. Over time, the heat will be slowly transferred to the car through conduction, which will eventually cause the temperature inside the car to rise. . It is equivalent to delaying the heating process of the sun and cannot be considered as a real insulation. In addition, the absorption of visible light, ultraviolet rays, and infrared rays by dyed thermal insulation films is not targeted, and even the absorption of visible light that does not require the most barrier is the strongest, and it can be said that not only does not give force when heat insulation, but also often gives wrong power. . In general, the effect of color insulation is very poor.
At present, there is no direct relationship between the heat insulation effect and the color depth of high-quality automotive insulation film (especially the front-shield film, with clear top). Take some high-quality thermal insulation films on the market as an example. They use a multi-layer composite structure. The design function of each layer is different. By coating special material particles, it can reflect different wavelength bands of infrared rays and ultraviolet rays, selectively blocking Different parts of the sun. Reflection also makes the heat virtually permanently sequestered. The high-quality insulation film can achieve a rejection rate of 97% for infrared rays, and less than 10% for visible light, which is higher than the national regulations.
Conclusion: rumors cracked. There is no inevitable relationship between the heat insulation effect of the automotive insulation film and the color depth of the film. The high quality insulation film not only can effectively insulate heat, but also ensure high light transmittance at the same time and ensure the safety of driving.
Rumor 2: Good quality metal foil will not block the car signal.
Truth: Most foils today are multi-layer laminates. Metal foils are foils that contain metal insulation. This layer of metal heat insulation layer is treated with a special process on a PET film (PET polyester-based film) and coated with a metallic nano-metal layer of aluminum, silver, and nickel. Aluminum, silver, and nickel were selected because of their high electrical conductivity, shallow depth of penetration, and high reflectivity to infrared rays.
Such a layer of nano-metal layer plays an effective role in heat insulation, but at the same time it also brings problems: a metal-shelled car, together with a metal-containing film on the window glass, does not become a solid one. Metal cover thing. Think about the content of the high school physics class. Is there a device called the "Faraday Cages?? A cage made of metal or good conductor named after the founder of electromagnetism and the English physicist Michael Faraday's surname. "Faraday cage" can effectively block the electric field and electromagnetic wave interference inside and outside the cage. This property has application in many aspects. However, when the car is equivalent to a "Faraday cage", it also brings some problems: Car GPS signals, cell phone signals, etc. that need to pass through the body are easily masked. This is determined by the nature of the metal film itself, regardless of quality. If you do not want to interfere with the signal, you can only choose non-metallic insulation film.
Conclusion: rumors cracked. Metal foils do cause the GPS signal in the car to be blocked, which is determined by the nature of the film itself. If you need to ensure the smooth flow of signals, you can choose non-metallic film.
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7. X-axis travel: 400mm;
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