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What is the main raw material of pe plastic bag? Its full name is Polyethylene, a simple polymer organic compound. It is the most widely used polymer material in the world. It is made of ethylene and is divided into high-density poly according to density. Ethylene, medium density polyethylene and low density polyethylene.
Pe plastic bag production method:
A, slurry method. Polymerization in a diluent such as hexane is the first industrialization and the largest production method to date.
B, liquid phase bulk method. Polymerization was carried out in liquid propylene at 70 ° C and 3 MPa. C, gas phase method. The polymerization is carried out under conditions in which propylene is in a gaseous state. The latter two methods do not use thinner, the process is short, and the energy consumption is low. The liquid phase bulk method has now shown an advantage in the future.
The molding characteristics of Pe plastic bags:
A, crystallized material, low hygroscopicity, easy to melt fracture, long-term contact with hot metal is easy to decompose.
B, good fluidity, but the shrinkage range and shrinkage value is large, easy to shrink holes, dents, deformation.
C, the cooling speed is fast, the pouring system and the cooling system should be slowly dispersed, and pay attention to control the molding temperature. The material temperature is easy to orient at low temperature and high pressure. When the mold temperature is lower than 50 degrees, the plastic parts are not smooth, and it is easy to produce poor welding and flow marks. Warping deformation is easy to occur above 90 degrees
D, plastic wall thickness should be uniform, avoid lack of glue, sharp corners, to prevent stress concentration. PE plastic bag main features: non-toxic, odorless, low density, strength, stiffness, hardness and heat resistance are better than low-pressure polyethylene, It is used at about 100 degrees. It has good electrical properties and high-frequency insulation without being affected by humidity, but it becomes brittle at low temperature, not wearable and easy to age. It is suitable for making general mechanical parts, corrosion-resistant parts and insulating parts. Common acid and alkali organic solvents have little effect on it. They can be used in food utensils, crafts, toys, hardware, electronics, clothing, agriculture, food, and gifts.
