Aluminium foil strip is used as air conditioner aluminium fin strip because of its advantages such as low density, good thermal conductivity, easy processing, tasteless, environmental protection and low price. The heat exchanger of air conditioning also develops to ultra-thin and high strength. In the 1980s, the thickness of the heat exchanger sheet was 0.15-0.2ram, but today it is only 0.09-0.15mm. Classification is as below.
1. Uncoated aluminum foil strip
Uncoated aluminum foil refers to the rolled and annealed aluminum foil without any form of surface treatment. Ten years ago in China and 15 years ago in foreign countries, all the aluminum foils used for air conditioning heat exchanger were uncoated. About 50% of the heat exchanger used in developed countries are still uncoated aluminum foil, while in China, the ratio is about 60%.
2. Coated aluminium foil strip
The so-called coated aluminum foil is to re treat the surface of uncoated aluminum foil, so that it has a special function. In Japan, Germany and other countries with rapid technological development, coated aluminum foil has been used for more than 15 years. In China, the time of using coated aluminum foil is less than 10 years. According to the characteristics of the coated aluminum foil surface, it can also be classified as follows:
3. Corrosion resistant aluminium foil strip
The surface of the corrosion-resistant aluminum foil product has a certain corrosion-resistant protective layer. The air conditioning heat exchange sheet made of the product can be applied to the worse areas, and can significantly improve the service life of the air conditioning. At the same time, due to the improvement of the corrosion resistance of the heat exchanger, the formation of corrosion powder on the surface is greatly reduced, thus improving the ventilation quality and purifying the air in the air conditioning room.
4. Hydrophilic aluminum fin strip
The surface of hydrophilic aluminum foil has strong hydrophilicity. The hydrophilicity is determined by the angle formed by water sticking to the surface of aluminum foil, as shown in Figure 1. The smaller the a angle is, the better the hydrophilicity is; otherwise, the worse the hydrophilicity is. Generally, angle a is less than 35. It belongs to hydrophilic property. Hydrophilic aluminum foil is generally used in evaporator of air conditioner. The main function of the utility model is to make the moisture in the hot air easily spread and flow down the sheet when it condenses on the heat exchange sheet into water drops. In this way, the ventilation effect of the heat exchanger can be avoided due to the “bridging” of the water drops between the heat exchange sheets, so as to improve the heat exchange rate of the air conditioner, and save electric energy under the condition of the same cooling capacity. Before, the general hydrophilic aluminum foil in the market has not only good hydrophilic surface, but also high corrosion resistance, which makes the performance of air conditioning more optimized.
5. Hydrophobic aluminium foil strip
Hydrophobic aluminum foil is also called water repellent aluminum foil. Its surface performance is opposite to hydrophilic aluminum foil. That is to say, when the condensate condenses to the surface of the aluminum foil, the contact angle with the 36 wide aluminum coil stock foil is relatively large, generally at 75. above. The larger the angle, the better the water repellency. The ultimate goal of using hydrophobic aluminum foil is the same as that of hydrophilic aluminum foil, that is, not to let the condensed water stay between the heat exchange sheets. The difference is that the hydrophobic aluminum foil can remove the condensation water between the heat exchanger sheets by increasing the contact angle between the condensation water and the heat exchanger sheets, so that the condensation water can form water drops which are easy to slide.
6. Self lubricating aluminum foil fin strip
In the process of processing and manufacturing, the air conditioner heat exchanger generally needs to add lubricating oil to its surface, then punch and flanging, and finally wash the lubricating oil with trichloroethylene. Because trichloroethylene is harmful to human body, in order to reduce this process, self-lubricating aluminum foil is produced accordingly. As the name implies, the self-lubricating aluminum foil does not need to be added with lubricating oil alone when it is processed, and the lubrication during the processing is undertaken by the pre-treatment film on the surface of the aluminum foil. Since no special lubricating oil is needed, the subsequent cleaning and drying process of trichloroethylene is also omitted.
7. Mould proof aluminum air conditioner foil
Mould proof aluminum foil is mainly used for indoor unit of air-conditioning. Its main function is to prevent the surface of heat exchanger from mildew due to long use or placement time, so as to significantly improve the ventilation quality of air-conditioning, prevent the generation of abnormal smell, and effectively improve the indoor environment of air-conditioning.