In daily life, a lot of PE plastic bags are used to pack products, but there are many kinds and names of packaging materials. When we need to use PE bags, what method do we use to identify them?

PE film is widely used in the manufacture of plastic bags, plastic films and milk barrels. Its name is also polyethylene, which is resistant to a variety of organic solvents and acid-base corrosion, but non antioxidant acids, such as nitric acid, will be oxidized in the oxidizing environment.

Polyethylene can be considered transparent in the film state, but in the presence of a large number of crystals, there will be strong light scattering and opaque. The degree of crystallization of polyethylene is affected by the number of branches. The more branches, the more difficult it is to crystallize. The melting temperature of polyethylene crystal is also affected by the number of branches, which are distributed from 90 ° C to 130 ° C. The more branches, the lower the melting temperature. Polyethylene single crystal can be prepared by dissolving HDPE in xylene in the environment above 130 ℃.

Structure of PE bag: - CH2 - CH2 - CH2 - CH2 - CH2 - CH2 - CH2 - CH2 - CH2.

The easiest way to identify PE bags is as follows:

1. Cut a small piece and put it in the water. What floats on the water is PE.

2. Ignite, PE has candle smell.

3. It seems that PE bag is transparent.

4. PE plastic bag is smooth and comfortable to touch.

5. It's hard to pull.

PE plastic bags are easy to identify. When they are in water, they can be burned, looked, smelled, touched and pulled.