Aluminum foil bag can be used as high-temperature cooking bag

How to select high-quality aluminum foil bags as high-temperature cooking bags, three points to pay attention to.

1. The number of pinholes in aluminum foil should be less. Aluminum foil should be a good barrier material, but if it has pinholes, its barrier will be greatly reduced. Gas and light will penetrate directly and quickly, and the content will soon change. Generally speaking, the thicker the aluminum foil, the less the number of pinholes, such as 7 μ For m thick aluminum foil, the number of pinholes should be less than 200 holes per square meter: 9 μ For m thick aluminum foil, the number of pinholes should be less than 100 holes per square meter. No matter how thick the aluminum foil is, the hole diameter of the pinhole should not be greater than 20 μ m。

2. The appearance of aluminum foil should be clean, free of oil and dust, and the surface tension should be high, which should reach more than 72mN/m. A simple way is to check with distilled water, which should be fully moistened on the surface of aluminum foil. If the oil stain on the surface of aluminum foil is severe, it will affect the composite fastness of aluminum foil and other materials, especially after the packaging bag is cooked at high temperature, it will have delamination and peeling.

3. The texture of aluminum foil should be soft, not easy to crack when folded, and should have good durability. The purchased aluminum foil should be kept in a dry state, and should not be placed for too long. It should be used as soon as possible to avoid the aluminum foil from moisture absorption and oxidation and metamorphosis.

Aluminum foil is metal, and the thickness of aluminum foil is 9 μ M (also available 7 μ M thick) soft aluminum foil has excellent moisture resistance, gas resistance and light resistance. If there is no mechanical damage and pinhole, it is completely impermeable to moisture, air and light, and has extremely high heat and oil resistance. Therefore, the composite packaging bag containing aluminum foil has the functions of full sealing, high fragrance, high oil resistance and high temperature resistance.