Aluminum foil bags are more and more widely used in food packaging, and the composite bags materials contain aluminum foil bags. The wide application of aluminum foil bags is related to their material properties. According to the unique physical properties of aluminum, it is light and shiny, has strong reflection ability, can be used as heat-proof and insulating packaging, has good barrier properties, is impermeable to air and water vapor, has strong temperature adaptability, stable shape at high or low temperature, shading and durability. Excellent etc. After multi-layer lamination and compounding with other high-barrier materials, it is made into a product, which has the functions of good moisture barrier, barrier, light-proof and permeability resistance, and is vacuum-packed. The biggest advantage of aluminum foil is that it blocks oxygen and moisture very well, and the water permeability and oxygen permeability are both 1, which is a good barrier material. In addition, aluminum foil has good heat resistance, good light reflectivity and gloss, good shape at high temperature and low temperature, suitable for high temperature cooking, and high temperature resistance of 125 degrees Celsius. Food bags, packaging bags As the material itself, aluminum foil bags have their own limitations. First of all, the biggest disadvantage of aluminum foil is that it is very brittle and easy to break. more difficult to combine. The disadvantage of aluminum foil is poor acid resistance. When packaging juice or acidic items, it is generally not placed in the inner sealing layer to ensure that the layer will not be penetrated by acid and separated. Furthermore, it has no heat sealability and cannot be used as the innermost layer of a composite bag. In view of the above material characteristics, aluminum foil can only be used as the middle material of the bag. Aluminum foil bags, plastic packaging bags Aluminum foil packaging bags generally adopt a four-layer structure. According to different uses, the materials of aluminum foil packaging bags can also be divided into: PET/NY/AL/PE (general packaging), and PET/NY/AL/CPP ( high temperature cooking). The characteristics of the materials of each layer are as follows: PET-good printing effect, NY-low oxygen permeability, PE-inner layer of ordinary packaging, CPP-inner layer of high temperature cooking, AL-strong barrier property and opaque. In production, all layers of materials are perfectly combined, and the aluminum foil packaging bag has many of the above-mentioned excellent characteristics. Aluminum foil bags can be made into different bag-type packaging bags, such as three-side sealing bags, self-supporting zipper bags, yin-yang bags, etc. According to different bag types and functional purposes, aluminum foil packaging bags are widely used in many industries. Specifically: 1. Food packaging bag series: rice, meat products, dried fish, aquatic products, preserved meat, roast duck, roast chicken, roast pig, quick-frozen food, ham, cured meat products, sausages, cooked meat products, pickles , bean paste, condiments, etc. Second, it is suitable for packaging of various circuit boards, electronic products, precision machinery parts, consumer goods, industrial products, etc. For example: PC boards, IC integrated circuits, electronic components, SMT patches in various LED industries, light strip packaging, precision hardware, auto parts and other packaging. As a popular product in the flexible packaging industry, vacuum packaging bags are used in vacuum packaging in various food, catering, electronics, chemical and other industries, because vacuum packaging bags can extend the shelf life and safety of products longer than ordinary plastic packaging bags. . There are two common types of vacuum packaging bags: transparent vacuum packaging bags and aluminum foil vacuum packaging bags, through a brief description of the material characteristics and performance characteristics of the two. 1. Material: 1. The material of aluminum foil vacuum packaging bag is: PET/AL/PE, PA/PET/AL/PE, PET/AL/cooking CPP Features: good performance, no transparent effect, high temperature resistance, as high temperature cooking aluminum foil Generally speaking, it is recommended to buy this bag if you have certain requirements for moisture and waterproof. Food packaging bags, vacuum packaging bags Goose and other poultry packaging) packaging. Second, the price: The vacuum packaging bag made of aluminum foil is more expensive than the transparent vacuum packaging bag. There are two types of bags of the same specification and thickness. For example, the transparent vacuum packaging bag is 1–4 cents, and the aluminum foil material is 2–6 cents. Around, the price changes with the price of raw materials. The vacuum packaging bag should be selected according to the actual requirements of the product, and it is the best to find the packaging bag that meets the product. , tea packaging bags, composite packaging bags