(Summary description)1. High isolation: Co-extruded film with high isolation of different plastic materials is used to achieve high isolation of oxygen, water, carbon dioxide, odor, etc. To 2. Stable function: oil resistance, moisture resistance, low temperature freezing resistance, quality, freshness, smell, and can be used for vacuum packaging, aseptic packaging, and inflatable packaging. To 3. High strength: The co-extruded film has the characteristics of stretching during the processing. After the plastic is stretched, it can travel strength correspondingly. It can also participate in the center of nylon, polyethylene and other plastic materials to make it have a composite strength that exceeds the general plastic packaging. . To Fourth, low cost: Compared with glass packaging, vacuum bags and other plastic packaging, co-extruded film has a greater cost advantage. To Five, no pollution: the vacuum bag does not increase the adhesive, there is no doubt about the residual solvent pollution, and it is green and environmentally friendly. To 6. Small volume ratio: The co-extruded film can be packaged by vacuum shortening, and the volume-to-volume ratio is close to 100%, which is unmatched by glass, iron cans, and paper packaging.