Self-supporting nozzle bag refers to a flexible packaging bag with a horizontal support structure at the bottom and a suction nozzle on the top or side; its self-supporting structure can stand on its own custom pouch bag in china without any support and whether the bag is opened or not. How do you choose the material of the self-supporting nozzle bag? 1. Outer layer The outer layer is the printing material. Now the commonly used stand-up bag printing materials on the market are not only ordinary OPP, but also high-strength and high-barrier materials such as PET and PA, which can be selected according to the situation. If it is used to package dry fruit solid products, common materials such as BOPP and matte BOPP can be used. If packaging liquid products, PET or PA materials are generally used. 2. Intermediate layer The intermediate layer is generally made of high-strength, high-barrier materials, such as PET, PA, VMPET, aluminum foil, etc. And RFID, the surface tension of the interlayer material is required to meet the composite requirements, and it must have a good affinity with the adhesive. 3. Inner layer The inner layer is the heat-sealing layer, and materials with strong low-temperature heat-sealing function such as PE, CPE, and CPP are generally used. The surface tension of the composite surface is required to meet the composite requirements, but the surface tension of the hot cover must be lower than 34mN\/m, and it must have excellent anti-pollution, anti-static and heat-sealing properties. 1. Self-supporting bags are defined in many ways on the Internet: A packaging bag that can stand on its own without relying on external support is called a self-supporting bag. The editor believes that such a definition is easy to mix stand-up bags, four-side sealing bags, and eight-side sealing bags. The editor gives such a definition: the bottom has a fold and has 2 edge sealing, one edge sealing on the left and right, and a packaging bag that can stand on its own after the bottom is opened. 2. Eight-side sealed bag Eight-side sealed bag is also called eight-side sealed flat bottom bag. Its bottom is flat, and there are eight sealed sides, hence the name. There are 4 edge seals at the bottom and 2 edge seals on the left and right, for a total of 8 edges. The eight-side sealing bag has 5 display surfaces: 1 on the front and back, 1 on the left and right, and 1 on the bottom. In this way, the eight-sided sealed bag can carry more information and media information, and better display and promote food and brands.