What is the name of the main raw material of PE plastic bag? Its full name is polyethylene, a polymer organic compound with simple structure, which is the most widely used polymer material in the world today. It is made of ethylene polymerization. It is divided into high-density polyethylene, medium density polyethylene and low-density polyethylene according to the different density. Production method of PE bag: A. slurry method. Polymerization in diluent (such as hexane) is the first industrialized method and the largest production so far. B. liquid phase bulk method. It is polymerized in liquid propylene at 70 ℃ and 3Mpa. C. gas phase method. Propylene is polymerized in gas state. The latter two methods do not use diluent, so the process is short and the energy consumption is low. The liquid phase bulk method has shown the advantage of coming from behind.

 

 

 

Molding characteristics of PE plastic bag: A. crystalline material, small moisture absorption, easy to occur melt fracture, easy to decompose in long-term contact with hot metal. B. good fluidity, but large shrinkage range and shrinkage value, easy to occur shrinkage cavity, dent, deformation. C. fast cooling speed, slow dispersion of pouring system and cooling system, and pay attention to control the molding temperature. When the material temperature is low temperature and high pressure, it is easy to orient, and when the mold temperature is lower than 50 ℃, the plastic parts are not Smooth, easy to produce poor fusion, flow marks, easy to warpage above 90 degrees D, plastic wall thickness must be uniform, to avoid lack of glue, sharp corners, to prevent stress concentration.

 

 

 

The main characteristics of PE plastic bag are non-toxic, tasteless, small density, superior to low-pressure polyethylene in strength, rigidity, hardness and heat resistance. It can be used at about 100 degrees. It has good electrical performance and high-frequency insulation, which is not affected by humidity, but brittle, wear-resistant and aging at low temperature. It is suitable for making general mechanical parts, corrosion-resistant parts and insulation parts. Common acid and alkali organic solvents have little effect on it. They can be used in tableware, handicrafts, toys, hardware, electronics, clothing, agriculture, food, gifts.