As one of the important soft packaging materials, aluminum foil has its unique characteristics. So what are these characteristics? This article will introduce the various properties of aluminum foil packaging bag, and teach you how to "play" aluminum foil.
1. Mechanical properties
The mechanical properties of aluminum foil mainly include tensile strength, elongation and crack resistance. The mechanical properties of aluminum foil are mainly determined by the thickness. The national standard GB / t3198-2003 "aluminum and aluminum alloy foil" has made corresponding provisions on the longitudinal mechanical properties of aluminum foil in China.
In general, aluminum foil is light in weight, good in ductility, thin in thickness and small in weight per unit area. But the strength is low, easy to tear, easy to break when folding, producing holes, so it is not used alone for packaging products. In many cases, it is compounded with other plastic film and paper to overcome its disadvantages.
2. High barrier
Aluminum foil has high barrier to water, steam, optical fiber and fragrance, and is not affected by environment and temperature. Therefore, aluminum foil is commonly used in fragrance preserving packaging and moisture-proof packaging to prevent moisture absorption, oxidation and volatilization deterioration of packaging contents. Aluminum foil packaging bag is especially suitable for high temperature cooking and sterilization packaging of food.
3. Corrosion resistance
The formation of oxide film on the surface of aluminum foil can further prevent the oxidation. Therefore, aluminum foil has certain durability and air corrosion resistance. However, it is not resistant to acid and alkali corrosion. Therefore, when the content of the package has high acidity or alkalinity, it is often coated with protective material or coated with PE to improve its corrosion resistance.
4. Heat and low temperature resistance
The aluminum foil is stable at high and low temperature. It does not swell and shrink at - 73-371 ℃, and has good thermal conductivity, and its thermal conductivity can reach 55%. Therefore, it can be used not only for high temperature cooking or other hot processing, but also for frozen packaging.
5. Shading performance
Aluminum foil has a good shading performance, and its reflection rate can be as high as 95%. At the same time, the appearance of aluminum foil packaging bag is silvery white metallic luster, which can show good packaging decoration effect by surface printing decoration. Therefore, aluminum foil is also a kind of high-grade packaging material. http://www.ycritai.cn/
Dongguan Beite packaging materials Co., Ltd
Aluminum foil packaging bags, mask bags, self-supporting zipper bags, eight side sealing bags, red wine bags, dog food bags, beverage bags, bags in boxes, wrapped films, perforated fruit bags.