Sound Proof Window Film

1. Thermal insulation principle of automotive window film

(1) Where does the heat come from

Sunlight includes three main types of light: 53% infrared, 44% visible, and 3% ultraviolet. The main source of heat is infrared.

72% of the heat in a car is radiated into the car by sunlight through the car glass, and the remaining 28% is transferred to the car by convection through parts such as the car body and door seams.

(2) Classification of principles of automotive window film insulation

① Single layer metal reflective film

Only when the light transmittance is low can part of the heat be blocked, which results in a lack of both transparency and thermal insulation.

② Heat absorbing film (used chemical heat absorbing agent)

It can only be temporarily insulated. "Because it absorbs heat into the car, it gets even hotter after driving for a long time.".

③ Magnetron sputtering metal film (metal film is physically insulated)

True thermal insulation. By radiating the heat radiated on the car glass to the outside of the car, long-term thermal insulation is ensured.

2、 Calculation formula for thermal insulation effect of automotive window film

Total solar barrier ratio=infrared barrier ratio * 53%+visible light barrier ratio (1-visible light transmittance) * 44%+ultraviolet barrier ratio * 3%

Using this formula, it is possible to roughly calculate whether the thermal insulation efficiency of a certain car window film meets the advertising requirements.

3、 How to judge whether the thermal insulation effect of car window film is good or not?

(1) Calculate by the above formula;

(2) Identification method of heat absorbing film: Use an infrared ray irradiator to irradiate a car window film. If the car window film becomes hotter after a few minutes, it is a heat absorbing film.

Hot Tags: sound proof window film, China sound proof window film manufacturers, suppliers, factory