It can meet the packaging requirements of various items, and is an ideal material for packaging easy-to-store and easy-to-place convenience foods, daily necessities, and small-packaged goods in supermarkets. This is the early use of stretch film, and more packaging forms have been developed as a result. Full-width packaging. This type of packaging requires the film width to cover the pallet, and the pallet has a regular shape, so it has its own use. The suitable film thickness is 17~ 35m manual packaging This kind of packaging is a simple type of stretch film packaging. The film is mounted on a shelf or hand-held, rotated by the tray or the film is rotated around the tray. Secondly, PIB is a translucent viscous liquid. It has a process of migration and will be affected by temperature. When the temperature is high, the viscosity is strong; when the temperature is low, it is not too viscous, and the viscosity decreases after stretching. However, as the number of manufacturers of stretched film is increasing, how to distinguish the quality of stretched film has become a publicly understood problem. The annual output of stretch film in my country is more than 30,000 tons, of which there are only 9 large stretch film production lines, and the rest are small-line production films. Like the texture of the cling film we usually use, the tensile strength of the stretch wrap film is much stronger than that of the fresh-keeping film, and the wrapping is also stronger. Use stretch wrap film to wrap scattered items or just want to wrap it up. The article presents a whole state so that the article will not fall off and can be wrapped in a film. There are many materials for the stretch film, which mainly depend on the application field of the product, so if you want to control the viscosity of the stretch film, you can work hard on the material. The surface coefficient of the stretch film When discussing the surface coefficient of the stretch film, we often say what we and our customers require that the surface factor of the wrapping surface of the stretch film should be, for example, less than 0.1; and the coefficient occurs before and after the production process. How much has changed and so on.