Cars are not allowed to stick dark film. How to shade?
Source: | Author:Anna Qu | Publish Date :2021-09-18 | 344 Times Viewed: | Share:
Cars are not allowed to stick dark film. How to shade?

thermal radiation

ultraviolet rays


The main function of car film is called filtering the above two kinds of light. However, the original car glass is enough to filter all ultraviolet rays, so there is no need to worry about this kind of light harmful to human body. Infrared will produce high temperature. It is possible to be burned if exposed to strong light for a long time. How much can the film play?

"Thermal saturation" refers to the limit of an object's absorption and storage of heat energy. If it exceeds the limit, it will not be able to continuously absorb heat energy, and it will also have thermal radiation. I believe all infrared telescopes have heard of it. Its principle is to find targets by detecting the thermal radiation of organisms; In other words, the human body itself is constantly releasing heat energy, and the solar film adhered to the inside of the window is obviously no exception. Moreover, the thermal saturation limit of the solar film is very low, which will reach the limit in a very short time under strong light. Then, the sun and the solar film conduct thermal radiation at the same time, and the cooling in the car completely depends on the air conditioner.

Can car curtains be used?

After denying the meaning of car film, it seems that the only way to shade is "curtain". The car can be shielded by curtains, but the rear side windows can be used later! Refer to the technical conditions for safety of motor vehicle operation, which is included in the regulations.

The visible light transmittance of automobile windshield and driver's visual area shall be ≥ 70%.

The concept of the viewing area is the front block, as well as the front and rear windows used to observe the road conditions on both sides and behind. In theory, the windows in these positions cannot be covered with films and curtains.

Knowledge point 1: the glass of the original car is not absolutely "transparent and colorless". There are some light background colors in the windows, which are used to filter ultraviolet and infrared rays; The light projection ratio of these glasses is only about 75% ~ 90%. Many vehicles without film are close to the minimum standard. I'm afraid as long as some colors of the film are lower than the standard. The annual inspection of automobile has become more and more standardized and professional. In the later stage, no matter van or car, as long as the vehicles that fail to meet the standard will be required to tear off the film.

Knowledge point 2: there is no requirement for the visible light transmittance of the rear window of the off-road bus (operating medium bus). As long as the reflective sunshade film is not pasted. Therefore, the mainstream household passenger cars can install curtains for the rear window, and the film naturally does not need to control the color depth; Only the HCHO of the sunshade film will always exceed the standard ten times, which will seriously damage the air quality in the car.

Therefore, it is generally not recommended to apply automobile film. Choosing automobile curtains is a good way to shade the sun; As for the rear gear, foldable curtains can be installed, and it is best to be able to open and close electronically. Generally, MPV models will not be punished for installing curtains, and vans should pay due attention.