Aluminum Foil for Air Conditioner

1. Aluminum Foil for Air Conditioner Abstract: With the spreading of air conditioner, the demand for air conditioner aluminum foil keeps increasing. At the same time, the air conditioner foil kinds is richer and the requirements for the converter foil is higher. Learn more here. Different Different Alloys Alloys of of Air Air Conditioner Conditioner Aluminum Aluminum Foils Foils The converter foil is mainly used as fin stock material for air conditioner heat exchanger. At present, the common alloys are 1100, 3102 and 8011. The common tempers are H22/H24/H26. Thickness is between 0.08-0.2mm. There are certain differences in strength and plasticity in each temper. As for which alloy and temper to choose, it depends on the actual situation. Lets’ come to know about their differences. 1100 aluminum foil has good formability, corrosion resistance, thermal conductivity and certain strength. It is widely used in heat exchangers in the refrigeration industry, storage containers in the chemical and food industries, and capacitor shell materials in the electronics industry. 8011 air conditioner foil has added Fe and Si elements. Its tensile strength is 125-165, yield strength is 110 and elongation is 2-5. In terms of performance, although pure aluminum foil has good rust resistance, formability and weldability, compared with 8011 aluminum foil, it is softer and of low work hardening and low tensile strength. 3102 aluminum foil for air conditioner is of small brightness and can reduce the wear of the mold. At the same time, it is not easy to crack during foil rolling and its performance properties can fully meet the requirements. That’s why 3102 aluminum foil is favored by more and more air conditioner aluminum foil manufacturers an the air conditioning market.

2. Properties Properties of of Air Air Conditioner Conditioner Foil Foil Air conditioner foil is often used as a heat-conducting fin material for air-conditioning heat exchangers. It has the advantages of low density, good thermal conductivity, easy processing, odorlessness, environmental protection and low price. Chemical Element The alloys of aluminum foil for air conditioner are mainly 1100, 1200,3102, 8011,etc. Generally, the air conditioner does not have strict requirements on the chemical composition of aluminum heat exchange fins. Without surface treatment, the corrosion resistance of 3A21 aluminum alloy is relatively good. Its mechanical functions such as strength and elongation are high, and the hardness is also large. The choice of alloy depends on the ultimate mechanical function of the raw material and the processing difficulty. For example, 1100 aluminum alloy with higher purity is easier to roll, while 8011 alloy is more difficult. Mechanical Properties It mainly refers to the tensile strength, elongation and Erichsen value of aluminum foil. The ideal situation is that these three indices are all high. But for the aluminum foil, these three indices are opposed to each other. When the tensile strength of the aluminum foil is relatively high, the elongation will decrease; and increasing the elongation of aluminum foil will cause a decrease in tensile strength.Therefore, in practice, the intermediate value of the mechanical function is generally taken. According to the different requirements of the heat exchange fins on the mechanical function, there are currently three tempers of the air conditioner aluminum foil: H22, H24 and H26. Each temper corresponds to a certain strength and plasticity scale. Hydrophilic Hydrophilic Aluminium Aluminium Foil Foil for for Air Air Conditioner Conditioner Fin Fin The aluminum foil for air conditioner is mainly divided into two types: plain

3. aluminum foil and hydrophilic aluminium foil due to their different performance. Plain aluminum foil refers to the rolled and annealed aluminum foil without any surface treatment, and is mainly used for low-grade split air conditioner outdoor units and window-type air conditioner. In recent years, with the improving requirements for energy-saving, environmental protection and corrosion and bacteria resistance, the plain aluminum foil gradually can’t satisfy the need. That’s why more and more air conditioner manufacturers choose hydrophilic aluminum foil. The surface of the hydrophilic foil has a strong hydrophilicity. The water droplets condensed on the radiator are easy to spread and flow down, avoiding affecting the ventilation effect of the radiator, so that the heat exchange efficiency is increased by 5%. In addition, the hydrophilic coated foil is of strong corrosion resistance, great bacteria resistance and no odor, which is mainly used for high-end air conditioners. Hydrophilic aluminum foil is to do hydrophilic treatment for the aluminum foil, which is coated with an anti-corrosion coating and a hydrophilic coating and is dried in a drying furnace. Because the surface is coated with a hydrophilic layer, the condensed water will quickly spread on the hydrophilic aluminum foil and will not condense into water beads, accelerating the cooling and heating speed and effectively avoiding the noise of air flow caused by the obstruction of the condensed water. The main advantages of hydrophilic aluminum fin stock: 1. Excellent hydrophilicity and corrosion resistance. 2. Good formability and no abrasion to the mold. 3. Extremely strong resistance to stamping oil, solvent and heat. 4. The air flow resistance is small, and the heat exchange rate can generally be increased by 10%-15%. The The Quality Quality Requirements Requirements of of Air Air Conditioner Conditioner Aluminum Aluminum Foil Foil The common air conditioner aluminum foils are 1100,1200,8011 and 3102. No matter it is hot-rolled or cast rolled, its alloy components should comply with the provisions of GB 3190-2008(in China). However, during production, the actual control range of different aluminum foil manufacturers is different. The control range of its chemical composition is mainly to consider the product's tensile strength, elongation and Erichsen value to meet the customers’ requirements. The surface quality of aluminum foil for air conditioner requires that it should be flat

4. and clean, and no defects such as corrosion, pinholes, creases, brown oil spots, and cracks. The wettability by brushing of aluminum foil for air conditioner should not be lower than B grade. At present, the aluminum foil thickness for air conditioner is 0.1-0.12 mm,of which the trend is becoming thinner. There are two forming methods for aluminum fin stock: one is the stretch forming method, which has a slow forming speed and requires a large deep drawing ability for air-conditioning foils. The other is the thinning stretch forming method, which has a faster forming speed and the thickness is generally below 0.11 mm, This requires aluminum foil not only to have certain plasticity but also have a higher strength. That is to say, different forming methods have different requirements for the performance of air conditioner foils. According to the market demand for air conditioner foils, it is required to meet the both two forming process. For meeting this requirements, aluminum fin stock should be with H22 temper, tensile strength of 120-130 MPa, elongation of more than 18% and Erichsen value of 6 mm. The The Developing Developing Trend Trend of of Air Air Conditioner Conditioner Foil Foil In recent years, with the continuous development of he air-conditioning industry, the manufacturing of air conditioner foil has also developed very rapidly. The early aluminum foil used for air conditioning was made of pure aluminum such as 1050 aluminum foil. However, with the continuous improvement of air conditioning production technology, the air conditioning fins have undergone major changes. The original 1000 aluminum foil can no longer meet the requirements of air conditioner aluminum foil. The aluminum foil manufacturers are constantly looking for breakthroughs in alloy composition. With the addition of Fe and Si, we get a 8011 aluminum foil. Its tensile strength is 125-165, yield strength is 110 and the elongation is 2-5. It has strong mechanical properties, good tensile strength and easy to process. Another two kinds of aluminum fin stock are 3003 and 3102 aluminum foil. 3102

5. aluminum alloy fin stock is one higher strength aluminum alloy having good corrosion resistance. 3003 aluminum alloy has good formability, few metallurgical defects, uniform thickness, and good flatness. Through the research on the different alloys, the strength and toughness of the hydrophilic aluminum foil has bee improved greatly. At the same time, thinning the thickness of aluminum foil for air conditioner is particularly obvious. The amount of aluminum foil used for air conditioner varies greatly depending on the model and power. The thinner aluminum foil can reduce the amount of aluminum used and reduce the cost of air conditioning radiators under the same heat exchange area. As a big aluminum foil producer, Haomei has introduced the word-class foil rolling mill and adopted ANDRITZ rolls, a guard for the high quality aluminum foil. The aluminum fin stock is flat and free of defects such as black oil spots, small black silk, bright lines, burrs,etc. the trend of