Why can aluminum foil bags be used as food packaging bags? Why do food packaging bags use aluminum foil?
The aluminum foil of the 25KG aluminum foil bag for food is a flattened metal aluminum tool that can be used in the kitchen to cook, hold food, or make some materials that can be easily cleaned. Aluminum foil packaged foods on the market are generally heatable and can be stored for a long time. Most of the aluminum foil used in food processing has one side that is bright and the other side that is gray. Aluminum foil paper for food can be used to wrap food on both sides. It is usually recommended to wrap food on the glossy side to improve the heat conduction effect.
Why do food packaging bags use aluminum foil? This is because metal aluminum will be oxidized by oxygen, forming a dense protective film of aluminum oxide on the metal surface to prevent oxygen from continuing to oxidize the metal aluminum. Of course, packaging bags made of aluminum foil use this The dense protective film can effectively isolate outside air from entering the inside of the bag and prevent food from being oxidized and spoiled. On the other hand, aluminum foil has good ductility, excellent barrier properties, strong corrosion resistance, and good printing adaptability. Rather, it prevents food from reacting with oxygen.
Aluminum foil is used in food packaging bags because of its good barrier properties. The oxygen transmittance of aluminum foil is extremely low, which can effectively block gases in the air that can easily cause food to deteriorate, such as oxygen, gas, etc. And aluminum foil is opaque and has good light-shielding properties, preventing certain foods from discoloration or deterioration due to exposure to light. Aluminum foil itself has extremely poor corrosion resistance and is easily corroded by acidic or alkaline substances.
In addition, 25KG aluminum foil bags have strong plasticity and can be made into a variety of bag types, such as three-side sealing food packaging bags, four-side sealing bags, eight-side sealing bags, self-standing zipper bags, special-shaped bags, etc. Different bag types The aluminum foil packaging bags can be applied to different types of food packaging.
Moisture-proof aluminum foil bags have metallic luster, good light protection, and high reflective ability to heat and light. The metallic luster and reflective ability can improve the brightness of printed colors; they have good isolation and protection, are impermeable to gas and water vapor, and prevent internal The material absorbs moisture and vaporizes, and is not susceptible to bacteria and insects; it has good shape stability and is not affected by changes in humidity. It is easy to process and can be used for printing, color difference, embossing, surface coating, gluing and painting on aluminum foil bags. Composite aluminum foil bags also have advantages such as insulation.
The production process of aluminum foil bags is simple and cumbersome. The overall production process is: aluminum ingot smelting-casting and rolling-cold rolling-intermediate annealing-cold rolling-aluminum foil wool-rough rolling-intermediate rolling-finishing Rolling (double closing) - slitting - annealing of finished aluminum foil - compounding - bag making - finished aluminum foil bag - packaging. In this process, it is the whole process from aluminum foil wool to processing of plain foil, and then composite bag making. In order to save costs and time, companies that produce aluminum foil bags generally choose to directly purchase aluminum foil films and then composite materials to make bags.
