Aluminum foil is a flexible metal foil made of industrial pure aluminum with a thickness of 0.4-0.7mm (more 0.5mm is used) after repeated cold rolling and thinning. In the manufacture of metal cans, aluminum foil is mostly used for the manufacture of new easy-to-tear lids and sealed foils in cans. The thickness of aluminum foil used for metal cans is mostly between 0.06 ~ 0.09mm. Next, I will introduce the uses of aluminum foil and the various properties of aluminum foil.
Aluminum foil use
1. Air-conditioning foil
Air conditioner foil is used in the manufacture of air conditioners and is an important component of air conditioners-a special manufacturing material for heat exchangers. Air conditioning foil is an aluminum foil with fewer metallurgical defects and better ductility, so it has good formability during processing and the aluminum foil material is very uniform. After post-corrosion protection and other processing, the air-conditioning foil also has good surface properties. Generally speaking, the thickness of the air-conditioning foil is between 0.10-0.15 mm, but due to the gradual exquisite processing technology, the thickness of the air-conditioning foil has a tendency to decline. For example, the thickness of the air-conditioning foil made in Japan can reach only 0.09 mm.
2. Cigarette packaging foil
This kind of aluminum foil can be said to be the closest to our daily life. We can see the use of cigarette foil in cigarette boxes. Especially in China, the domestic demand and export volume of cigarettes are large, so the cost of cigarette packaging foil is also very large. Generally speaking, 70% of cigarette foil is rolled aluminum foil, and another 30% is sprayed foil. At present, the cigarette foils produced by several domestic companies can reach the world-class level, but on the whole, the average quality is still a certain distance from the world level.
3. Foil for decoration
Because aluminum foil has excellent coloring properties and good light and heat reflectivity, it can also be used for decoration and packaging. About the last century was the era when decoration foils were used in the decoration field, and then quickly became popular. Because the decoration foil also has the characteristics of moisture-proof, anti-corrosion, heat insulation and sound insulation, it is a very good decoration material. In addition, aluminum foil packaging is exquisite and high-end, which has gradually become popular in recent years.
4. Cable aluminum foil
Because aluminum foil is hermetic and shielding, aluminum foil can also be used as a shield for cables. But before use, aluminum foil needs to be processed with plastic film. For cable aluminum foil, there are certain requirements on the length, mechanical properties, sealing performance, especially the length requirements are very strict.
Various properties of aluminum foil
1. Mechanical
The mechanical properties of aluminum foil mainly include tensile strength, elongation, and crack strength. The mechanical properties of aluminum foil are mainly determined by the thickness. The national standard GB / T3189-2003 "Aluminum and Aluminum Alloy Foil" specifies the longitudinal mechanical properties of aluminum foil in China.
Generally speaking, aluminum foil is light in weight, good in ductility, thin in thickness, and small in mass per unit area. However, it is low in strength, easy to tear, and easy to break when folded, which can cause perforation, so it is generally not used alone for packaging products. In many cases, it is compounded with other plastic films and paper to overcome its shortcomings.
2. High barrier
Aluminum foil has a high barrier to water, water vapor, light, and fragrance, and is not affected by the environment and temperature. Therefore, it is often used in fragrance-preserving packaging, moisture-proof packaging, etc. to prevent moisture absorption, oxidation and volatile deterioration of the contents of the package. Especially suitable for high temperature cooking and sterilization packaging of food.
3. Corrosion resistance
An oxide film is naturally formed on the surface of the aluminum foil, and the formation of the oxide film can further prevent the continuation of oxidation. Therefore, when the content of the package has high acidity or alkalinity, it is often coated with a protective coating or PE on the surface to improve Its corrosion resistance.
4. Heat resistance and low temperature resistance
The high temperature and low temperature of aluminum foil are stable, and the temperature does not expand and contract at -73 ~ 371 ℃. At the same time, it has good thermal conductivity and its thermal conductivity can reach 55%. Therefore, it can be used for high-temperature cooking or other thermal processing, and can also be used for frozen packaging.
5. Shading
Aluminum foil has a good light-shielding property, its reflectivity can be as high as 95%, and its appearance is silver-white metallic luster. The surface printing decoration can show good packaging and decoration effects, so aluminum foil is also a high-end packaging material.
Editor's summary: The purpose of aluminum foil and various properties of aluminum foil are introduced here, and I hope it will be helpful to everyone. For more related knowledge, you can follow the information on this website.
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