PE is the abbreviation of polyethylene, a thermoplastic resin obtained by polymerization of ethylene. In the industry, but also copolymers of ethylene with minor amounts of α- olefins. Polyethylene odorless, non-toxic, feel like wax, has excellent low temperature properties (lowest service temperature up to -70 ~ -100 ℃), good chemical stability, resistance to most acid-base corrosion (intolerance with oxidation properties The acid), room temperature, soluble in common solvents, water absorption, excellent electrical insulation properties; but polyethylene for environmental stress (chemical and mechanical action) is very sensitive, heat aging poor. Polyethylene nature because of different varieties, depending on the molecular structure and density. Using different production methods can be of various density (0.91 ~ 0.96g / cm3) of the product. Generally available polyethylene thermoplastic molding method (see plastics processing) processing. Wide range of uses, mainly used to manufacture film, containers, pipes, monofilament, wire and cable, and other daily necessities, and as television, radar and other high-frequency insulating material. Commonly used on the market and according to a count by the length count (volume). (A) pouch packaging is mainly used for small parts, electronic products, accessories bags more anti-static effect, flat pocket divided and self-styled structure, which is also called bone pocket (PE bone bags) or dense bags; (Volume) Bags There needs its own cut (packaging material) and print cut (supermarket). PE cling film other materials can also be known as PE bags, note plastic wrap in direct contact with food must choose PE material (the other is generally PVC) and relatively safe for humans. Resolution methods: transparency, stretchability and adhesive PVC cling film cling film strength than PE. PVC cling film when using fire, flame black, black smoke, pungent odor, will not drip, it will automatically turn off after leaving the fire. While PE cling film flame yellow, odorless, will drop of oil, and the left can continue to burn after the ignition source. Packaging weight reduction will continue to make progress. From some of these projects can be clearly seen in the general trend to reduce packaging quality. Smaller weight plastic containers and flexible packaging, plastic bottles instead of glass and metal containers, can reduce the amplitude of ground transportation costs. Its development trend include: easy to pick up handling, required inventory that due to lighter packaging, pallet load is reduced accordingly, may reduce the spleen motorcycle and fork lifts; for the individual cartons, glass and plastic containers, and flexible packaging other food packaging container packing up, we need to increase their strength, in order to facilitate safe delivery of the store.