There will be many car owners who often use it to ask, why does the car still feel hot after pasting the heat insulation film, and it will not be hot if the heat insulation film is not pasted? This is also one of the common misunderstandings of car film, and I will give you a science popularization here:
To answer the above two main questions, it is important to first know how heat is transferred.
There are three main forms of heat transfer, convection, conduction, and radiation. From a microscopic point of view, it's a bit abstract, but it involves something that's common in the environment, convective heat conduction.
When we stand in front of a hair dryer, we can feel that conduction is similar to the heat we feel when we touch fresh steamed buns with our hands, and radiation is similar to the heat we feel when we stand in front of an infrared lamp.
These three heat transfer methods are placed on the car respectively, the heat in the convective sun enters the car through the gap between the body and the air, conducts the heat into the car through conductors such as doors and roofs, and the radiation is manifested as heat entering the car through the window.
Therefore, when a part of the window glass of the car body acts only for one-third of the period as a heat transfer medium, the heat insulation film attached to the window glass acts only as a barrier to the heat of the window glass entering the car.
In other words, even the highest-grade heat insulation film on the market today is unlikely to block all the heat from entering the interior of the car.
In addition, the rear window film does not have air conditioning, and in the absence of air conditioning, the internal temperature rise is irreversible.
The significance of the membrane is mainly that when the car is parked or driven in a hot environment, the car can slow down the heating rate, rather than the temperature does not rise.
Having said so much, I believe that the first two major problems need to be well understood, no matter what kind of car film is pasted, the temperature in the car will rise if exposed to the sun for a long time, and the difference between high-quality car film and inferior car film is the heating speed.
