Aluminum foil is high barrier and shading. Compared with paper, plastic film, aluminum foil due to a high density of metal crystal structure, so it has excellent barrier, such as moisture resistance, resistance to gas, light and fragrance of high. When aluminum foil composite with paper, film and others, almost completely cut off any the transmission of gas, water vapor and light can effectively protect the contents of the package, prevent the contents from being corrupted due to moisture absorption and oxidation, thus greatly extending the storage life and shelf life of the contents of the package.
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