The material of the composite food packaging bag is composed of 2 to 4 layers of plastic materials. The material matching of the packaging bag requires professionals with certain experience to match the most cost-effective material combination within the effective range of the budget. We first introduce the first layer material of food packaging bags: food bags, food packaging bags 1. The outer layer The outer layer is both printed and the main function is to display and promote copy information, generally BOPP (bright film) BOPP (matt or matte) Anyone who has made PET (white film) or nylon (white film) bags knows that the thickness of these materials is also written on the contract. BOPP is the most widely used, and most bags in supermarkets are printed with BOPP. Vacuum material printing film PET and (PA) nylon, tea packaging uses PET more, because the price is much cheaper than nylon, nylon is used in boiled or boiled bags, generally chicken legs, dried tofu, bamboo shoots, etc. Some cooked foods are sterilized by high temperature at 90°C to 120°C using nylon. Of course, the ink is also high temperature resistant ink. 2. The intermediate material of the intermediate layer is generally PET, PET (aluminized), and aluminum foil. PET (aluminum-coated) and aluminum foil are used to increase the sealing performance and aesthetics of the bag. For example, the potato chip bag is flushed with nitrogen, and the deoxidizer in the nuts uses PET (aluminum-coated) to increase the sealing degree. The aluminum foil material is completely shading and high temperature resistant. Now many bags are made of aluminum foil material. I personally prefer to use aluminum foil material, because aluminum foil has very high barrier properties and air tightness, and the taste of the product will not change after long-term storage. However, the material of aluminum foil also has defects, that is, the bag shape is not beautiful and has creases after being squeezed. I believe that in the future, the material of aluminum foil will be accepted by more and more consumers. In addition (the silver paper used for grilling fish on paper in major restaurants is aluminum foil) 3. Heat-sealing layer The heat-sealing layer is the innermost material, and the middle layer can be discarded. These materials are PE, CPP, these two are the most common, as long as it is a composite bag, there are these two materials. These two materials have a lot of functions. The 90-degree sterilization is called boiled PE, and the 120-degree sterilization is called cooking CPP. There are also highly transparent PE, anti-freeze PE. PE is usually used more often, which is also recommended based on the customer’s uncertain sales. If the product is sold to the north, if PE is not used, it is easy to break the package and crack. In fact, CPP material can also achieve such a function, but it is too unstable, and it will also prevent such incidents from occurring in the future after-sales.
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