Which four layer structure is commonly used for aluminum foil bags?

Which four layer structure is commonly used for aluminum foil bags? Aluminum foil bags are made of aluminum and other high barrier materials based on the unique properties of aluminum, which are dryly compounded into aluminum foil bag products. Aluminum has the characteristics of light weight and luster, strong reverse ability, good barrier property, impermeability to gas and water vapor, strong adaptability to temperature, stable shape at high or low temperatures, strong shading property, and excellent aroma retention.
Therefore, aluminum foil bags have good moisture resistance, barrier, light resistance, permeability resistance, and beautiful appearance. The water vapor transmittance can reach<0.015 g/(m2 · 24h)>. They also have a heat sealing function, and can be vacuumed for packaging. The composite aluminum foil bags have an opaque appearance, a silver white color, and a reflective luster, and can be stored in an environment with a temperature of ≤ 38 ℃ and a humidity of ≤ 90%.
Composite aluminum foil bags are used for food packaging, generally used to package meat products, dried fish, aquatic products, cured meat, roast duck, roast chicken, roast pig, quick-frozen food, ham, bacon products, sausage, cooked meat products, Pickled vegetables, bean paste, seasonings, etc. to preserve flavor, quality, taste and color.

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