OPP bag is the stretchability of polypropylene, is a kind of plastic, is plastic bags, whose character is: easy to burn. Under the situation of flame: movement of molten drop, yellow blue, away from the fire and smoke less, continue to burn. OPP (Oriented polypropylene) : Oriented polypropylene (film), is one of the types of polypropylene and two-way polypropylene (BOPP) O (Oriented) : should mainly refers to the production process. PP (polypropylene), polypropylene, but as a general structure parts, corrosion-resistant chemical equipment spare parts, electric heating insulation Has such characters as high transparency, brittle, by OPP monolithic folded after lateral sealing side and in mouth tongue stick adhesive stickers, when used in products to tear to protect the skin on the surface of the seal with the tongue folded after cement can, use convenient, beautiful generous, widely used in clothing, food, printing, stationery, cosmetics, paper and other industries. You can print all sorts of design according to customer needs and the butterfly hole, hole plane. OPP bag has distinct advantages: A, sealing is good. Experimental data show that the new type sealing OPP bag is more than double its traditional bag, so that the moisture of their products, preservation sex is stronger, last longer; Second, the security. New bag used synthetic technology and special printing technology has the very high technological content, only Germany and Japan, two countries master the technology, counterfeit production, anti-counterfeiting provides strong guarantee for goods; Three, the new OPP bag of the raw materials for biodegradable materials, used in full compliance with international environmental protection standards. PE is short for polyethylene, ethylene polymerization of a thermoplastic resin. In industry, including ethylene and small amounts of alpha olefin copolymer. Polyethylene odourless, non-toxic, feel like wax, has good low temperature resistance (the lowest temperature can reach 70 ~ 100 ℃), chemical stability is good, most of acid and alkali erosion (acid) with characteristics of oxidation resistance, temperature does not dissolve in solvents, small water imbibition, excellent electrical insulation properties; But polyethylene for environmental stress (chemical and mechanical effect) is very sensitive, heat aging. The properties of polyethylene owing to the different varieties, mainly depends on the molecular structure and density of different production methods can get different density (0.91 ~ 0.96 g/cm3) of the product. Polyethylene available general thermoplastic plastic molding method (see plastic machining). PE cling film of material also can be called PE bag, pay attention to the plastic wrap of direct contact with food must choose PE material (the other is PVC), safe to human body. Discrimination method, the transparency of PVC cling film, stretchability, and viscosity is better than PE cling film. Black PVC cling film in the fire, fire, smoke, a pungent odor, does not drip, left after the fire will automatically go out. And PE cling film combustion flame yellow, odorless, will drip, and left after the fire could continue to burn.