The difference between PE, PO, PP, PVC, OPP, CPE and other commonly used plastic bags

PE plastic bag is a polymer organic compound made by addition polymerization of ethylene. Polyethylene is recognized as the best food contact material in the world. Non-toxic, odorless, and odorless, in line with food packaging hygiene standards. Polyethylene film, light and transparent, has the properties of moisture resistance, oxygen resistance, acid resistance, alkali resistance, general air tightness, excellent heat sealability and so on. It is one of the most widely used plastic bags and the most widely used plastic bags. The bag body is soft, but the transparency is not high enough for other materials, and it is relatively Mongolian. Good pull! Not easy to burst!

PO plastic bag is blow molded from high-density polyethylene (HDPE), non-toxic, feels like wax, has excellent low temperature resistance (minimum use temperature can reach -70 ～ -100 ℃), good chemical stability, can withstand large Corrosion of most acids and alkalis (not resistant to acids with oxidizing properties), insoluble in common solvents at room temperature, low water absorption, excellent electrical insulation; but polyethylene is very sensitive to environmental stress (chemical and mechanical effects) and heat Poor aging. The properties of high-density polyethylene vary from species to species, depending on the molecular structure and density. Different production methods can be used to obtain products with different densities (0.91 ～ 0.96g / cm3). Polyethylene can be processed using general thermoplastic molding methods (see Plastic Processing). The body of the bag is brittle, the transparency is not high enough, it is even thicker than the PE material, it is a little white, and the pulling force is not very good.

PP plastic bag, commonly known as: 100% off plastic. Polypropylene is a representative of poly-α-olefin, a thermoplastic resin prepared by polymerization of propylene, and its monomer is propylene CH2 = CH-CH3. According to different initiators and polymerization processes, polypropylene can be divided into three configurations: isotactic polypropylene, atactic polypropylene and syndiotactic polypropylene. Isotactic polypropylene is easy to form a crystalline state, with a crystallinity of more than 95% and a molecular weight between 80,000 and 150,000, giving him good heat resistance and solvent resistance; random polypropylene is an amorphous, White waxy material with slight stickiness, low molecular weight, 3000-10000, irregular structure, lack of cohesion, less application The bag body is hard, but the transparency is relatively high, clear, the pull is not very good! Explosive!

PVC plastic bag, polyvinyl chloride, plus ingredients to enhance its heat resistance, toughness, ductility, etc. The top layer of this surface film is paint, the main component in the middle is polyvinyl chloride, and the bottom layer is the back coating adhesive. It is a kind of synthetic material that is well-loved, popular and widely used in the world today. Among the materials that can produce three-dimensional surface films, PVC is the most suitable material. The bag body is soft or hard, and can be ordered according to the needs of the customers. The transparency can also be based on the needs. Because there are super transparent materials, ordinary materials and frosted materials, the pulling force is good, and it is not easy to rip or burst. Mouth, because the two layers of material are together with the machine beer.

OPP plastic bags have the best transparency, the highest transparency, and the most translucent appearance. They have the functions of dust prevention and enhancing the value of the packaged products. The products inside can be fully displayed in sales, so OPP plastic bag products are usually used as outer packaging for commodity sales, which not only protects but also beautifies. Widely used in jewelry, jade, stationery, toys, tableware, kitchen utensils, clothing and other fields. The bag is the most brittle, with the highest transparency and insufficient tension, but it is the most explosive. And the printing is the easiest to discolor.

CPE plastic bags are the most commonly used plastic bags for electronic products, such as Ipad tablets, Iphone mobile phones, PSP handheld game consoles, etc. These plastic bags are matte and smooth on both sides. It can also provide more high-end and more luxurious packaging bags.