PE is the abbreviation of polyethylene, a thermoplastic resin obtained by polymerization of ethylene. In industry, including copolymers of ethylene with small amounts of α- olefins. Polyethylene odorless, non-toxic, feel like wax, has excellent low temperature performance (the lowest temperature up to -70 ~ -100 ℃), good chemical stability, resistance to most acid-base erosion (impatience with oxidizing properties acid), at 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 resistance is poor. Polyethylene nature because of different varieties, depending on the molecular structure and density. Using different production methods can be of various densities (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 dielectric material. Commonly used on the market by an operator and by the length count (volume). (A) pouch packaging is mainly used for small parts, electronic products, accessories, bags and more anti-static effect, pocket sub-mouth and self-styled structure, which is also known as bone pocket (PE bone bag) or dense bags; (volume) bag There needs its own cut (packaging materials) and print incision (supermarket). Another PE cling film materials can also be known as PE bags, note cling film in direct contact with food, be sure to use PE material (the other is usually PVC) and relatively safe for humans. Resolution methods: transparency, tensile and adhesive PVC cling film wrap stronger than PE. PVC cling film when using fire, flame black, black smoke, a pungent odor, will not drip, it will automatically turn off after leaving the fire source. PE cling film while burning flame yellow, odorless, it will drip and left after the fire source can continue to burn. Food issue has been broad interest in the problem of removing the food itself, the packaging has become another important issue. As food bags material is not the same, so he has the particularity itself is different. As personal food composition, its quality, the printing ink is also very important. Some exquisite designs printed bags, with a lot of ink, benzene substances containing it more if it exceeded the residual amount of words, for human consumption after it, it may cause chronic poisoning. Many companies blindly pursue excessive beautifully packaged, often ignored issue of food security.