Aluminum foil bag refers to a type of composite bag containing aluminum foil in the composite bag. The sealing machine uses aluminum and other high-barrier materials to dry-composite aluminum foil bag products according to the unique properties of aluminum. Aluminum foil bag is made by dry compounding aluminum and other high barrier materials. Aluminum foil bag has good characteristics because of its light and shiny, strong reverse ability, good barrier property, air permeability and moisture, strong adaptability to temperature, stable shape at high or low temperature, strong shading and excellent moisture resistance. It has the functions of moisture resistance, barrier, light protection, permeability resistance and beautiful appearance, and the water vapor transmission rate can reach <0.015 g / (m2 · 24h)> . The choice of materials is determined by the end use, the contents of the package, the post-processing technology, and the environmental conditions of use. The same is an aluminum foil bag, such as packaging mustard pickles, the inner material is PE , because the pickles contain a certain amount of liquid, the storage conditions are around 0 degrees, suitable for PE . If cooking food like meat, CPP will be chosen . There is also packaging milk powder, and PE is also used for the inner layer . Consider requirements such as pollution resistance and impact resistance. Packaging meat products, but does not require high temperature cooking, CPP quality is not good when stored at 0 ~ 4 degrees . CPP becomes brittle when it is below 10 degrees. The low temperature resistance of PE is good, but it may become soft when the temperature is higher than 65 degrees. It is recommended to select the modified heat sealing material according to the use conditions. Different product packaging, the thickness of the packaging bag used is different, which is determined by the packaging nature of the product, for products with strict vacuum requirements, the thickness of the material used is larger. The greater the thickness of the aluminum foil packaging bag, the tighter the packaging performance, and the more it can meet the packaging requirements, but the packaging cost will be higher, and the packaging material cost is calculated by quality. Food packaging bags are not just made of aluminum foil, but made of composite materials. This composite material is made of aluminum foil and nylon. Some are made of four-layer coextruded film. When it comes to food, it is often a multilayer composite material. The reason for using multi-layer composite materials is to package food and maintain the quality of the food. The other is that rich colors and patterns can be printed on the food packaging bag, which is also a way for food to be recognized by the market. It is also a food The necessary means of publicity.
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