Generally, it is packaged in aluminum foil. Aluminum foil is a soft metal film. It not only has the advantages of moisture-proof, air-tight, light-shielding, abrasion resistance, fragrance retention, non-toxic and tasteless, but also because of its elegant silver-white luster, it is easy to process beautiful patterns and colors of various colors. pattern, so it is more likely to be favored by people. Especially after the aluminum foil is combined with plastic and paper, the shielding properties of the aluminum foil are integrated with the strength of the paper and the heat sealing properties of the plastic, further improving the shielding performance against water vapor, air, ultraviolet rays and bacteria necessary as a packaging material. , greatly broadening the application market of aluminum foil.