The heat shrinkable film is classified as PE heat shrinkable film PE polyethylene, which is a transparent thermoplastic. There are three types of PE commonly used, namely, LDPE, HDPE, LLDPE. The monomers of the three kinds of polyethylene are the same. However, the process conditions used in the synthesis of these polyethylene are different. Therefore, three different polyethylene varieties are generated. The properties of the three materials are quite different PE film is a kind of material with good toughness, which is not easy to be crushed by ordinary plastic crusher. As the PE film is soft and tough, it is not easy to cut, not to mention the high temperature of the tool at high speed, which will make LDPE melt and adhere to the blade. The PE granulation can be directly put into the extruder feeding port in strips, and the PE film can be pulled into the barrel by the shearing force of the screw to heat, melt and extrude for granulation. The first grade materials recycled from PE can still be blown, used for non food and drug packaging, and also widely used in the production of oxford leather and waterproof cloth, with a bright future. PE heat shrinkable film is widely applied to the whole package of liquor, pop can, mineral water, various beverages, cloth and other products. The product has good flexibility, strong impact and tear resistance, is not easy to damage, is not afraid of moisture, and has a large shrinkage rate. PVC shrinkable film PVC heat shrinkable film PVC, with additional ingredients to enhance its heat resistance, toughness, ductility, etc. The top layer of this surface facial mask is paint, the main component in the middle is PVC, and the bottom layer is back coated adhesive. It is a kind of synthetic material which is very popular and widely used in the world today. Among the materials that can produce 3D surface facial mask, PVC is the most suitable material. PVC is widely used in building materials and packaging industries due to its unique properties (rainproof, fire-resistant, anti-static, easy molding) and its low input and high output. Therefore, PVC film has the characteristics of high transparency, good glossiness, and high shrinkage. OPS heat shrinkable film OPS (oriented polystyrene) heat shrinkable film is a new type of body fitted packaging material that meets the environmental requirements. OPS heat shrinkable film has high strength, large rigidity, stable shape, and good gloss and transparency. Easy processing, easy coloring, good printing performance, and high printing resolution. It is completely a material progress for trademarks that constantly pursue exquisite printing. Because this high shrinkage and strength of OPS film can closely fit with containers of different shapes, it can not only print beautiful patterns, but also meet the use of new packaging containers with different shapes. This non-toxic, tasteless, grease resistant film, which meets the food hygiene standards, allows designers to use eye-catching colors to achieve 360 ° label design, giving full play to creativity and imagination, This makes the design of drinks and other goods more vivid in the use of labels, highlights the image on the shelf, and produces an unexpected container effect. PET heat shrinkable film PET heat shrinkable film is a new type of heat shrinkable packaging material. Because it is easy to recycle, non-toxic, tasteless, and has good mechanical properties, especially in line with environmental protection, polyester (PET) has become an ideal substitute for PVC heat shrinkable film in developed countries.