The high temperature heat resistant foil with aluminum alloy 3003, 1235, 8079, 8011 are supplied by Haomei Aluminum. And the soft package aluminum foil with a thickness of 9μm (7μm can also be used) is mainly used in the sterilization tank packaging bag. Heat resistant aluminium foil has excellent moisture resistance, gas barrier and light barrier properties. If there is no mechanical damage and pinholes, it is completely impermeable to moisture, air and light, and has extremely high heat resistance and oil resistance. Therefore, the composite packaging bag containing high temperature heat resistant aluminum foil has the functions of complete sealing, high aroma retention, high oil resistance and high temperature resistance.
When choosing high temperature cooking bags, the general raw material is high temperature heat resistant foil, so why can high temperature resistant aluminum foil bags be used for high temperature cooking? This article will analyze in detail the characteristics of high temperature resistant aluminum foil bags as high temperature cooking bags.
1, The high temperature resistant aluminum foil bag has good sealing performance and strong barrier properties.
The number of pinholes in the high-temperature aluminum foil should be reduced. However, if there are pinholes, its barrier properties will be greatly reduced. Gas and light will penetrate directly and quickly, and their contents will quickly change. Generally speaking, the thicker the aluminum foil, the smaller the number of pinholes. For example, the number of pinholes in an aluminum foil with a thickness of 7μm should be less than 200 holes per square meter: for an aluminum foil with a thickness of 9μm, 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 20μm!
2, The food safety grade of high temperature resistant aluminum foil bags, with high surface cleanliness, no oil and dust, and high surface tension, should reach 72mN/m or more.
A simple method is to use distilled water for inspection. The distilled water should be fully wetted on the surface of the aluminum foil. If the surface of the heat resistant foil is severely greasy, it will affect the composite fastness of the aluminum foil and other materials, especially after high-temperature cooking of the packaging bag, delamination and peeling will occur!