Views: 0 Author: Site Editor Publish Time: 2022-06-27 Origin: Site
The main cause of corrosion is that the product is affected by moisture or water during production and circulation. Therefore, to control the generation of corrosion waste products, it is mainly to prevent the aluminum foil from contacting with water. Anti corrosion measures: ① strengthen the management of the air dryer to ensure that there is no moisture in the compressed air. ② Strengthen the management of rolling oil and control its water content at 400 × Below 0.000001. ③ The package of aluminum foil roll shall be sealed, and an appropriate amount of desiccant shall be put into each roll. ④ The humidity of the wooden shaft and box plate of the packing box shall not be greater than 18%, and the temperature of the aluminum coil shall not be greater than 45 ℃. ⑤ Do not open the sealed package immediately when transporting from the low temperature area to the high temperature and humidity area. ⑥ Aluminum foil roll shall not be placed on the roof of workshop and warehouse where there is rain or snow leakage. ⑦ When transporting aluminum foil from low-temperature area to high-temperature area, the sealing of the package shall be strengthened, and desiccant shall be added if necessary. ⑧ When packaging aluminum foil products in rainy season, strengthen the sealing packaging and add desiccant.
(1）Air conditioning foil
Air conditioning foil is a special material for manufacturing heat exchanger fins for air conditioners. The early air conditioning foil was plain foil. In order to improve the surface properties of plain foil, anti-corrosion inorganic coating and hydrophilic organic coating are applied before forming to form hydrophilic foil. Hydrophilic foil accounts for 50% of the total amount of air conditioning foil, and its use proportion will be further improved. In addition, there is a kind of hydrophobic foil, which makes the fin surface hydrophobic and prevents condensate from adhering. Because the technology of improving the surface defrostability of hydrophobic foil needs to be further studied, the actual production is very few.
The thickness of air conditioning foil is 0.1mm ~ 0.15mm. With the development of technology, the air conditioning foil has a trend of further thinning. The thickness of the leading product in Japan is 0.09mm. In the extremely thin state, aluminum foil must have good formability. Its structure and properties must be uniform, with less metallurgical defects and anisotropy. At the same time, it is required to have high strength, good ductility, uniform thickness and good flatness. The specification and alloy of air-conditioning foil are relatively single, which is suitable for large-scale production. However, the market is highly seasonal. For professional air-conditioning foil manufacturers, it is difficult to solve the contradiction between short supply in peak season and almost no demand in off-season.
Driven by the strong market demand, the production capacity and technical level of air-conditioning foil in China have been continuously improved in recent years. Now, a group of enterprises producing air-conditioning foil in large, medium, small, high, medium and low levels has been formed. The product quality of some large enterprises such as Huabei aluminum and Bohai aluminum has basically reached the international advanced level. Due to the excess domestic production capacity, the market competition is extremely fierce.
（2） Cigarette packaging foil
China is the world's largest producer and consumer of cigarettes. There are 146 large-scale cigarette factories in China, with an annual output of 34million boxes of cigarettes. Most of them are packed with cigarette foil, of which 30% are sprayed foil and 70% are rolled aluminum foil. The consumption of rolled aluminum foil is 35000 tons. With the enhancement of people's health awareness and the impact of imported cigarettes, the growth of demand for cigarette foil has slowed down significantly and is expected to increase slightly in recent years. China's cigarette packaging foil accounts for 70% of the total amount of double zero foil. At present, twoorthree domestic enterprises can produce high-quality cigarette foil, and the technical level is equivalent to the international level. However, the overall quality of domestic cigarette foil lags behind the international level.
（3） Decorative foil
Decorative foil is a decorative material applied in the form of aluminum plastic composite, which makes use of the characteristics of aluminum foil, such as good colorability and high light and heat reflectance. It is mainly used for decoration of buildings and furniture and packaging of some gift boxes. The application of decorative foil in China's construction industry began in the 1990s. It has spread rapidly from central cities such as Shanghai, Beijing and Guangzhou to all parts of the country. In recent years, the demand has increased sharply. It is generally used as the decorative material for the inner wall of buildings and indoor furniture. It is also widely used in the door and indoor decoration of commercial institutions.
Decorative foil has the advantages of heat insulation, moisture-proof, sound insulation, fire prevention and easy cleaning. Moreover, it has luxurious appearance, convenient processing and fast construction and installation. China's construction and home decoration industries have formed an upsurge in the application of decorative foil. With the rapid development of China's construction industry and the continuous popularization of decorative foil application, the demand for decorative foil will increase significantly. In addition, the use of decorative foil packaging gifts is very popular abroad. In recent years, it has developed rapidly in China and is expected to have a good prospect.
（4） Cable foil
Cable foil is a kind of aluminum \plastic composite foil, which is formed by applying plastic film on one or both sides based on the airtightness and shielding of aluminum foil, and is used as the shield of cable. The cable foil requires less oil on the surface, no holes, and high mechanical properties. The overall quality requirements are not high, but the length requirements are extremely strict.
Domestic advanced cold rolling mills, 10000 rolling mills and aluminum foil roughing mills can all produce, but the market growth is poor. The domestic annual demand is about 25000 tons.