Points for attention in selecting aluminum foil bags as high-temperature cooking bags

If you want to choose the aluminum foil bag as the high-temperature aluminum foil cooking bag, you should first choose the aluminum foil used in the cooking package, and pay attention to three points:

1. The surface cleanliness of aluminum foil should be high, without oil and dust, and the surface tension should be high, which should reach more than 72mN/m. A simple method is to test with distilled water. The distilled water should be completely soaked on the surface of aluminum foil. If the surface of aluminum foil is heavily oiled, the composite fastness of aluminum foil and other materials will be affected, especially after the packaging bag is cooked at high temperature, delamination and peeling will occur.

2. 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 deteriorate. 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。

3. The aluminum foil should be soft, not easy to break when folded, and have good toughness. The purchased aluminum foil should be stored in a dry state, and should not be placed for too long. It should be used as soon as possible to prevent the aluminum foil from moisture absorption and oxidation and deterioration. Aluminum foil is metal. The thickness of aluminum foil used in cooking packaging bags 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 properties of full sealing, high fragrance, high oil resistance and high temperature resistance.