In daily life, many PE bags are used to pack products, but there are many kinds of packing materials and names. When we need to use PE bags, what methods do we use to identify them? PE film is widely used to make plastic bags, plastic films and milk barrels. Its name is also polyethylene, which is resistant to a variety of organic solvents, acid and alkali corrosion, but not antioxidant acids, such as nitric acid. Polyethylene is oxidized in an 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 ℃. The structure of PE bag: - ch2-ch2-ch2-ch2-ch2-ch2-ch2-ch2-ch2pe bag is identified by the following simple methods:

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

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.

After reading the above interpretation, do you think PE bags are easy to identify? When you put them into water, you can just burn them, see them, smell them and touch them.