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Aluminum foil has the advantages of good barrier, shading, gorgeous appearance, small weight, non-toxic and other packaging materials. Therefore, aluminum foil is widely used in the field of packaging, packaging is the only metal foil. In the use of aluminum foil as packaging materials, to find out the performance of aluminum foil, in order to better reflect the performance of aluminum foil as packaging materials.
Aluminum foil is widely used in the field of packaging, There are many aluminum foil packaging properties. In the use of aluminum foil as packaging materials, to find out the performance of aluminum foil, in order to better reflect the performance of aluminum foil as packaging materials.
First, mechanical
The mechanical properties of aluminum foil mainly include tensile strength, elongation, crack resistance and so on. The mechanical properties of aluminum foil is mainly determined by the thickness, the national standard GB/T3189-2003 "aluminum and aluminum foil" in the longitudinal mechanical properties of China's aluminum foil made the corresponding provisions.
On the whole, the quality of aluminum foil is light, the ductility is good, the thickness is thin, the unit area is small. However, the strength is low, easy to tear, easy to break when folded, perforation, it is generally not used alone for packaging products. In many cases, and other plastic film and paper composite, in order to overcome its shortcomings.
Two, high barrier
Aluminum foil has high barrier properties to water, water, light, smell, and is not affected by the environment, the influence of temperature, so commonly used in packaging, packaging and other fragrance preserving performance moisture, to prevent moisture absorption, oxidation and volatilization of deterioration of the contents of the package. High temperature cooking sterilization packaging for food.
Third, corrosion resistance
Natural aluminum foil surface oxide film formation, the formation of the oxide film can be further continue to prevent oxidation, therefore, in the packaging contents have high acidic or alkaline, often on its surface coated with protective coating or coating PE etc, in order to improve its corrosion resistance.
Four, heat resistance, low temperature resistance
Aluminum foil of high temperature and low temperature is stable, the temperature in 73 ~ 371 ℃ when the shrinkage deformation does not go up, at the same time has good thermal conductivity, the heat transfer rate can reach 55%. So not only can be used for high temperature cooking or other hot working, and can be used for refrigerated packing.
Five, the shading sex
Aluminum foil has the very good shading sex, the reflective rate can be as high as 95%, is silvery white metal luster appearance at the same time, through the surface printing decoration can show a good packaging decoration effect, so the aluminum foil is also a kind of high-grade packaging materials.
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