The main component of PE bags is polyethylene, which has excellent low temperature resistance, good chemical stability, and can withstand most acid and alkali erosions. It is insoluble in general solvents at room temperature, has low water absorption, and excellent electrical insulation properties; It is very sensitive and has poor heat aging resistance. The properties of polyethylene vary from variety to variety, mainly depending on molecular structure and density. Products with different densities can be obtained by using different production methods. Polyethylene can be processed by general thermoplastic molding methods. It has a wide range of uses, mainly used to manufacture films, containers, pipes, monofilaments, wires and cables, daily necessities, etc., and can be used as high-frequency insulation materials for TVs, radars, etc.
PE bag is a kind of plastic bag, PE bag is divided into high density and low density. High-density ones are tougher, have high transparency, feel stiff, and are relatively expensive. Generally, the plastic bags given by supermarkets are high-density PE bags. The low-density PE bag is the ordinary kind of soft-touch bag sold by vegetables in the general market. The quality is inferior, the transparency is poor, and the price is cheap.
In industry, PE bags also include copolymers of ethylene and a small amount of α-olefin. Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance, good chemical stability, can withstand most acid and alkali erosion, is insoluble in common solvents at room temperature, has low water absorption, and has excellent electrical insulation properties. But polyethylene is a product of environmental stress. Polyethylene can be processed by general thermoplastic molding methods. It has a wide range of uses, mainly used to manufacture films, containers, pipes, monofilaments, wires and cables, daily necessities, etc., and can be used as high-frequency insulation materials for TVs, radars, etc. With the development of petrochemical industry, the production of polyethylene has developed rapidly, and the output accounts for about 1/4 of the total output of plastics. In 1983, the total production capacity of polyethylene in the world was 24.65Mt, and the capacity of the equipment under construction was 3.16Mt.
