Heat shrinkable film is used in the sales and transportation of various products, and its main function is to stabilize, cover and protect the products. Shrinkage film must have high puncture resistance, good shrinkage and certain shrinkage stress. In the process of shrinkage, the film will not produce holes. Because shrink films are often suitable for outdoor use, it is necessary to add UV anti-ultraviolet agents. Heat shrinkable film is widely used in the packaging of various products, such as food, medicine, sterilized tableware, cultural and sports supplies, craft gifts, printed matter, hardware and plastic products, telephones, electronic appliances and so on. Especially in the combined (bundled) packaging of irregular articles or commodities, it can not only meet the functions of moisture-proof, dust-proof, touch-proof and transparent display. , but also increase the attractiveness of products, can also be used to replace all kinds of cartons, not only saving packaging costs.