Supermarket shopping plastic bags to carry convenient, not afraid of wrestling, for people's daily life and the production of various industries to provide a greater convenience, but the plastic bags according to different materials and functions, its type is very much. Which supermarket shopping plastic bags and pp plastic bags is an important component of plastic bags, the difference between the two mainly include the following aspects.

First, the supermarket shopping plastic bags and pp plastic bags of different chemical structure. Pe is polyethylene, is a simple structure of the polymer, by the repeated -CH2-unit connection, polyethylene is added by the polymerization of ethylene. Pp refers to polypropylene, is a semi-crystalline thermoplastics.

Second, the supermarket shopping plastic bags and pp plastic bags are different characteristics. Polyethylene odorless, non-toxic, feel like wax, low temperature performance, supermarket shopping bags, the minimum temperature of up to -70 ~ -100 ℃. Polyethylene chemical stability, able to endure most of the acid-base erosion, at room temperature insoluble in the general solvent, water absorption, electrical insulation performance, but the heat aging resistance of polyethylene is poor. Polypropylene has a high impact resistance, mechanical properties of tough, able to resist a variety of organic solvents and acid corrosion.

Third, the supermarket shopping plastic bags in the application of pp plastic bags of different. Polyethylene is used in a large number of plastic bags, plastic film, milk barrels and other products. Polypropylene is widely used in industry, is one of the most common polymer materials, often used in the manufacture of various tapes, for food, beverage and other flexible packaging industry has made a greater contribution.