Aluminum foil is widely used in home air conditioners due to its advantages of low density, good thermal conductivity, ease of processing, odorlessness, environmental protection, and low price. With the rapid development of China's air-conditioning industry, the annual demand for aluminum foil for air-conditioning use has also been reduced from less than 5,000 tons in 1992 to a current annual demand of nearly 200,000 tons. In the extremely fierce competition in the air-conditioning market, the aluminum foil industry will also face new developments.
Aluminum foil performance requirements gradually increased
At present, aluminum foils for air conditioning heat exchange sheets can be mainly divided into two types: uncoated aluminum foil (vegetable foil) and coated aluminum foil. Uncoated aluminum foil refers to an aluminum foil that has been rolled and annealed without any treatment. The coated aluminum foil is an aluminum foil that has been subjected to a surface treatment of a non-coated aluminum foil to give it a special function.
10 years ago, China's aluminum foil used in air-conditioning heat exchangers are all non-coating aluminum foil. In recent years due to technological progress and market demand, the coating aluminum foil has developed rapidly, and sales volume currently accounts for half of the aluminum foil market. Price is the main advantage of non-coated aluminum foil, but this product can no longer meet the requirements of the market for energy-saving, environmental protection, anti-corrosion and anti-bacterial air conditioning. Therefore, the extensive use of coated aluminum foil has become inevitable.
It is understood that the coating of aluminum foil is mainly hydrophilic aluminum foil, hydrophobic aluminum foil and other varieties. It is understood that the basic use of aluminum foil is: inverter air conditioners, high-end models, export and export of air-conditioning more use of hydrophilic aluminum foil; domestic sales of air conditioners, window machines, automotive air conditioners are more prime foil. At present, hydrophilic aluminum foil is a widely used coated aluminum foil. The so-called hydrophilic aluminum foil is an aluminum foil that is coated with an anti-corrosion coating and a hydrophilic coating on an air-conditioning aluminum foil with a thickness of about 0.1 mm and dried in a drying oven. According to reports, the surface of hydrophilic aluminum foil has strong hydrophilicity, and it can be used on air conditioners to enable the water droplets condensed in the hot air to spread on the heat exchange sheet and spread downwards along the sheet material. Avoid the effect of the heat exchanger's ventilation effect due to the water bridging between the heat exchange fins, so as to increase the heat exchange rate by 5%. In addition, the hydrophilic aluminum foil also has other advantages: antisepsis, anti-mold, no odor; due to water-free beads, air-conditioning noise caused by vibration can be reduced accordingly; air-conditioning oxidation powder can be prevented from blowing into the room and adversely affect the human body, comply with environmental protection Requirements; can improve the heat exchanger's corrosion resistance and weather resistance, extend the life of the heat exchanger.
It is to see the advantages of hydrophilic aluminum foil, many aluminum foil companies are expanding the production scale of hydrophilic aluminum foil. Yang Zhiguang Industrial Co., Ltd. said that the company will increase the production of hydrophilic aluminum foil from the current 30,000 tons to 45,000 tons by the end of 2005. Many manufacturers have also developed new types of aluminum foils based on hydrophilic aluminum foils, such as hydrophilic aluminum foils with high corrosion-resistance coatings, hydrophilic aluminum foils with ultra-high corrosion-resistant coatings, and hydrophilic aluminum foils with antibacterial coatings. Hydrophilic aluminum foil and so on. It is reported that although hydrophilic aluminum foils with special properties can bring about better energy-saving, anti-bacterial, and corrosion-resistant effects, due to price constraints, air-conditioning manufacturers mainly choose ordinary hydrophilic aluminum foils, and even cheaper non-coatings. Aluminum foil.
In addition, the hydrophilic film of hydrophilic aluminum foil will deteriorate with time, oxidation, hydrophilic properties will significantly decline, resulting in condensation during the cooling process, forming a water bridge between the aluminum foil fins, blocking the circulating air duct, resulting in refrigeration The effect decays year by year. In order to solve this problem, recently, TCL Corporation and South Korean companies have used composite nanosilver titanium dioxide materials instead of ordinary hydrophilic aluminum foils to launch a “lifetime efficient†TCL titanium air conditioner. It is said that its heat sinks will not change over time. Hydrophilic performance declines.
There are some uncertainties in the production of air-conditioning heat sink aluminum foil. It is understood that the production and sales of aluminum foil are seasonal due to the need to cooperate with air-conditioning production. The general production characteristics of air-conditioning companies are: January-June is the peak season for production, July-October is the off-season production season, and production in November-December is slowly picking up. As aluminum foil is the heat sink material of air conditioners, production and sales are synchronized with the air conditioner industry, and the phenomenon of peak supply is often not available, making it difficult for some companies that do not completely produce aluminum foil for air conditioner radiators to adapt.
Fierce competition and falling profits
According to industry insiders, in 2004, the breakthrough volume of air-conditioning production made aluminum foil enterprises for air-conditioning radiators smile. However, with the increase of aluminum foil production capacity, the market situation has evolved from the initial shortage to the oversupply, and the price war has become an important means to seize the market. In the interview, many aluminum foil manufacturers have shown the difficulties of “reduced profits and fierce competitionâ€.
It is understood that the price of aluminum foil is generally the sum of aluminum ingot prices and processing fees. Air-conditioning companies generally determine the suppliers of air-conditioning aluminum foils through tenders at the beginning of the year of cooling. Generally, the processing cost changes are relatively small, and the price of aluminum ingots is generally the average price of aluminum ingots in the Shanghai Stock Exchange a month before delivery. Therefore, the track of changes in air-conditioning aluminum foil prices is The change trend with aluminum ingots is basically the same in the short term. The profits of aluminum foil manufacturers are processing fees. An employee of an aluminum foil manufacturing company said that the processing fee for aluminum foil for air-conditioning radiators has dropped and dropped. Taking hydrophilic aluminum foil as an example, the processing fee is a few thousand dollars less per ton than it was a few years ago. The main reason is that the total production capacity has far exceeded the actual demand. There are at least 40 rolling enterprises producing air-conditioner aluminum foil in China. Even after it is a hydrophilic foil product, after years of rapid development, its total production capacity has also been surplus, and a few companies have started. Seek overseas markets. A person in charge of Bohai Aluminum Co., Ltd. told the reporter that although the companies that produce air conditioners are becoming more and more concentrated and the brands of air conditioners are gradually decreasing, the purchase of well-known air-conditioning companies also favors large-scale aluminum foil manufacturers with technology and scale, but in recent years, Intensified price wars in the air-conditioning market have forced air-conditioning manufacturers to reduce raw material costs. In particular, for aluminum foil, which consumers “see†raw materials, air-conditioning companies reduce the processing fees as much as possible during the purchase, and some small companies are Without technical advantages, we can only fight prices.
In view of this, are aluminum foil enterprises with advanced technology and large output “have no fun?†a senior person in the industry stated: “Large companies have a large enterprise living method.†Because air-conditioning heat sinks use aluminum foil, the larger role is to dissipate heat, and for aluminum foils. The thickness is not particularly required, so the sales of aluminum foil have always been sold by weight. Therefore, the production of thinner aluminum foil can not only reduce the use of the same heat exchange area, but also reduce the cost of air conditioning radiator. Reduce air conditioning volume and weight. The practice of large-scale aluminum foil companies is "thinning, thinning, and thinning."
“The change in thickness of aluminum foil has always been a concern of the company.†Li Feixiang of Southwest Aluminum (Group) Co., Ltd. stated that thickness is an important parameter in the aluminum foil's geometry, with the advancement of aluminum foil technology and the development of the air-conditioning industry. The thickness of the aluminum foil for air conditioning heat exchange sheets tends to decrease. Ten years ago, the thickness of aluminum foil used in domestic air-conditioning heat exchange sheets was about 0.15-0.2mm, but now it has grown to 0.103-0.15mm. By introducing new technologies, the thickness of aluminum foil will be even thinner, and it is already 0.09mm or even 0.08. The development trend of mm direction.
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