1. Outer layer

The outer layer is the printing material. At present, the commonly used spout pouch 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, the middle layer

The intermediate layer generally chooses high-strength, high-barrier materials, such as PET, PA, VMPET, aluminum foil, etc. Moreover, RFID requires that the surface tension of the intermediate layer material must meet the composite requirements and must have a good affinity with the adhesive.

3. Inner layer

The inner layer is the heat-sealing layer, which is generally made of materials with strong low-temperature heat-sealing properties such as PE, CPE, and CPP. 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 good anti-pollution ability, anti-static ability and heat sealability.

The above is an introduction to the selection of spout pouch composite materials.