The basic types of automotive films
Automotive films can be classified into four categories: coating and composite process films, dyeing films, vacuum thermal evaporation films, and metal magnetron sputtering films.
1. Coating and composite process film:
The film of this process was produced in the 30s of the 20th century, and its main function is to block strong sunlight. This type of film basically does not have the effect of thermal insulation and is only used for shading light. What can be seen on the market is the early sun paper, commonly known as tea paper.
2. Dyeing film:
This kind of film was produced in the 60s of the 20th century, and most of the products seen on the market are deep dyeing processes, in which endothermic agents are added to absorb infrared rays in sunlight to achieve the effect of heat insulation. Because it also absorbs visible light, the visible light transmittance is not enough, and the clarity is poor due to the limitation of its own process. Another major weakness of this type of film is that the thermal insulation function decays quickly and fades easily, so this type of film is relatively cheap.
3. Vacuum thermal evaporation film:
This type of film was produced in the early 90s of the 20th century, and the vacuum thermal evaporation process is to evaporate the aluminum layer on the substrate to achieve the thermal insulation effect. This type of film has entered the field of what we commonly call metal films, which have long-lasting thermal insulation, but the weakness is that the clarity is not high, which affects the comfort of the field of vision. Another outstanding weakness is the high reflectivity, whether it is internal reflection or external reflection. The internal reflection will affect the driver's driving, and the severe ones will cause visual fatigue and cause accidents, and the external reflection will affect the vision of the industry or the car will be trapped.
4. Metal magnetron sputtering film:
The highest technology of glass film, produced in the late 90s of the 20th century, has undergone a variety of technological innovations, magnetron sputtering process is the nickel, silver, titanium, gold and other advanced aerospace alloy materials using the most advanced multi-cavity high-speed rotation equipment, magnetron sputtering process products in addition to good metal texture, stable thermal insulation performance, but also with other processes can not achieve the clarity and low reflection and lasting color.
Process differences
Coating process film – no thermal insulation:
There is basically no thermal insulation;
It does not contain metal insulation, only a dye is added to the glue to block the light;
Low transmittance of visible light and poor transparency;
It fades easily (often turning purple) and blisters easily after long-term use.
Dyeing process membranes – thermal insulation through chemical absorption:
Mainly in the glue to add endothermic chemicals, in a short period of time can absorb some heat, produce a seemingly excellent thermal insulation effect, after saturation will produce far infrared rays for secondary radiation (similar to the effect of radiators), far infrared rays are non-directional, not like the near infrared rays in the sun, the place to feel the heat;
The demonstration is concealed because the short-term heat does not expose its defects, so as to achieve the purpose of deceiving consumers:
Vacuum thermal evaporation process membranes – blocking heat by reflection of metals:
Non-spectral selectivity: while high light transmittance, infrared rays that generate heat are also transmitted in large quantities; The thermal insulation performance is improved, but it also greatly affects the penetration of visible light.
High reflection similar to mirror, easy to cause light pollution, some products to reduce reflection; The glue in the film is mixed with a dyeing agent, which is easy to age and fade;
Most of them contain only a single layer of metal, and the metal layer is uneven;
Most of them are made by evaporation (tin-like platinum paper production process) or by single-layer sputtering process.
Multilayer magnetron sputtering spectral selection film – (true reflected heat) Smart film with spectral selection produced using multilayer magnetron sputtering technology:
While ensuring high clarity, its thermal insulation performance is extremely excellent;
Sputtered with up to 5 to 11 layers of precious metals;
It completely relies on reflection to block the infrared rays that generate heat, and will not produce secondary radiation;
It does not contain dyeing ingredients, and the color is stable and will never fade.
Comparison of important application parameters
|
attribute |
Coating process films |
Dyeing process membranes |
Vacuum thermal evaporation membrane |
Magnetron sputtering film |
|
Thermal insulation |
not |
difference |
Poor |
Good |
|
Thermal insulation durability |
not |
Easy to decay |
So so |
Permanent |
|
Color and performance stability |
Staining, easy to fade, 3-5 months |
Stained, easy to fade, 3 months - 2 years |
The color is uneven, the stability is not high, 1-3 years |
Stable, 5-10 years |
|
definition |
difference |
difference |
Poor |
high |
|
Reflective |
low |
low |
high |
low |
|
Effect on electronic signals |
No, it doesn't |
not |
high |
influential |
|
Thermal insulation principle |
not |
Endothermics |
reflection |
reflection |
In the 21st century, led by quantum film, a new generation of window film was born - spectral selective film, this technology through the mutual extinction of a variety of metal film layers, so that the reflectivity of the car film greatly reduced, and the metal layer according to the infrared heat band, selectively reflect a large amount of infrared heat. As a result, a new generation of automotive film with high light transmittance, high heat insulation and low reflection has been achieved.
