1. Uncoated aluminum foil
Uncoated aluminum foil refers to aluminum foil that has been rolled and annealed without any form of surface treatment. In my country 10 years ago, the aluminum foil used for air-conditioning heat exchangers in foreign countries about 15 years ago was all uncoated aluminum foil. Even at present, about 50% of the heat exchange fins used in foreign developed countries are still uncoated aluminum foil, while in my country, this ratio is about 60%.
2. Coated aluminum foil
The so-called coated aluminum foil is to reprocess the surface of the uncoated aluminum foil to make it have some special function. In countries with rapid technological development such as Japan and Germany, the use of coated aluminum foil has a history of more than 15 years. In my country, the use of coated aluminum foil does not exceed 10 years.
3. Corrosion-resistant aluminum foil
The surface of the corrosion-resistant aluminum foil product has a certain anti-corrosion protective layer. The air-conditioning heat exchange fins made of this product can be used in relatively harsh areas and can significantly improve the service life of the air conditioner. At the same time, due to the improvement of the corrosion resistance of the heat exchange sheet, the generation of surface corrosion powder is greatly reduced, thereby improving the ventilation quality and purifying the air in the air-conditioned room.
4. Hydrophilic aluminum foil
The surface of hydrophilic aluminum foil has strong hydrophilicity. The hydrophilic performance is determined by the angle formed by the water sticking to the surface of the aluminum foil. The smaller the angle a, the better the hydrophilic performance, and vice versa, the worse the hydrophilic performance. Generally speaking, the angle of a is less than 35. It belongs to the hydrophilic properties. Hydrophilic aluminum foil is generally used on condensers of air conditioners. Its main function is to make the moisture in the hot air condense into water droplets on the heat exchange sheet and spread out easily and flow down the sheet. In this way, the ventilation effect of the heat exchanger can be avoided due to the “bridging” of water droplets between the heat exchange fins, thereby improving the heat exchange rate of the air conditioner and saving electric energy under the condition of the same cooling capacity. At present, the general hydrophilic aluminum foil on the market not only has good hydrophilicity on the surface, but also has high corrosion resistance, so that the performance of the air conditioner is more optimized.
5. Hydrophobic aluminum foil
Hydrophobic aluminum foil is also called water-repellent aluminum foil, and its surface properties are just the opposite of hydrophilic aluminum foil. That is, when the condensed water condenses on the surface of the aluminum foil, the contact angle formed with the aluminum foil is relatively large, generally 75. above. The larger the angle, the better the water repellency. The ultimate purpose of using hydrophobic aluminum foil is the same as that of hydrophilic aluminum foil, that is, to prevent condensed water from remaining between the heat exchange fins. The difference is that the hydrophobic aluminum foil achieves the purpose of removing the condensed water between the heat exchange fins by increasing the contact angle between the condensed water and the heat exchange fins, so that the condensed water forms droplets that are easy to slide off.
6. Self-lubricating aluminum foil
In the process of manufacturing the air-conditioning heat exchange fin, lubricating oil should be added to its surface first, then punching and flanging, and finally washing off the lubricating oil with trichloroethylene. Since trichloroethylene is harmful to the human body, in order to reduce this process, self-lubricating aluminum foil is produced accordingly. As the name implies, self-lubricating aluminum foil does not need to add lubricating oil separately during its punching process, and the lubrication during punching is borne by the pre-treated film on the surface of the aluminum foil. Since there is no need to add lubricating oil, the subsequent cleaning and drying processes of trichloroethylene are also omitted.
7. Anti-mildew aluminum foil
Mildew-proof aluminum foil is mainly used for the indoor unit part of the empty wither. Its main function is to prevent the surface of the heat exchange fin from becoming moldy due to use or placement for a long time, thereby significantly improving the ventilation quality of the empty withering and preventing the generation of abnormal odors. Effective to improve the air-conditioned indoor environment.