Most aluminum foil wrappers are shiny on one side and matte on the other. Food aluminum foil wrapping paper can be used to wrap food on both sides. It is usually recommended to wrap it with a bright surface to enhance the heat transfer effect.
The original aluminum foil packaging is really made of tin. The tin foil is softer than the aluminum foil packaging, and the food wrapped will have a tint smell. At the same time, the tin foil cannot be heated due to its low melting point, or the heating temperature is high-if it is above 160 ℃ It begins to become brittle-which limits its use in food packaging. If you need to grill food, you cannot use tin foil when baking food. Since the aluminum foil packaging paper has a higher melting point, it starts to melt when heated to above 660°C. It can be applied to ordinary barbecued foods, baked goods, and even traditional chicken chickens are wrapped in aluminum foil packaging paper for baking. It is clean and hygienic at the same time. And maintain the original flavor. Therefore, after the price of aluminum fell, aluminum foil packaging replaced tin foil in daily life. However, because metal aluminum affects the development of the brain, the surface of the current aluminum foil packaging is coated with a coating to avoid the release of metal aluminum.
Aluminum foil wrapping paper is usually used to hold food. It can be used to wrap bean sprouts, potatoes, sweet potatoes, etc. for grilling when used to prevent them from burning. Sometimes it is also used for decoration. Modern aluminum foil packaging paper is made of aluminum, and can also be used as an aluminum electrode for electrolysis. There are also hair stylists who use aluminum foil wrapping paper to perm their guests. Some people also use aluminum foil wrappers to absorb the oil in the soup. Aluminum foil packaging paper is also widely used for isolation layer, heat exchange, and as a conductor. Generally, the thickness of aluminum foil packaging used in paper-wrapped beverage packaging and food packaging bags is only 6.5 microns. This thin aluminum layer can be waterproof, preserve umami, anti-bacterial and anti-fouling. It is very common to use aluminum foil packaging paper trays to hold food. Although aluminum foil packaging paper trays are disposable, they are composed of aluminum and are less harmful to nature.
Air conditioner foil is a special material for manufacturing heat exchanger fins for air conditioners. The air conditioner foil used in the early days is plain foil. In order to improve the surface properties of the plain foil, an anticorrosive inorganic coating and a hydrophilic organic coating are applied before forming to form a hydrophilic foil. Hydrophilic foil accounts for 50% of the total air-conditioning foil, and its use ratio will be further increased. In addition, there is a kind of hydrophobic foil, which makes the surface of the fins have a hydrophobic function to prevent the adhesion of condensed water. As the technology of hydrophobic foil to improve the surface defrosting property needs further research, the actual production is very few.
The air-conditioning foil has a thickness of 0.1mm to 0.15mm. With the development of technology, there is a trend of further thinning of air-conditioning foils. Japan's leading product has a thickness of 0.09mm. In an extremely thin state, aluminum foil packaging must have good formability, its structure and properties must be uniform, metallurgical defects are small, and anisotropy is small. At the same time, it requires high strength, good ductility, uniform thickness, and good flatness. The specifications and alloys of air-conditioning foil are relatively simple and suitable for mass production. However, the market is highly seasonal. For professional manufacturers of air-conditioning foils, it is difficult to solve the contradiction between demand in peak season and almost no demand in off-season.
Due to the strong market demand, the production capacity and technical level of my country's air-conditioning foil have been continuously improved. Now a group of large, medium, small, high-, middle- and low-level production of air-conditioning foil has been formed. The product quality of some large enterprises such as North China Aluminum and Bohai Aluminum has basically reached the international level. Advanced level. Due to excess domestic production capacity, market competition is fierce.