PE resin is polymerized by monomer ethylene. Due to different polymerization reaction conditions such as pressure and temperature during polymerization, resins of different densities can be obtained. Therefore, there are high-density polyethylene, medium-density polyethylene and low-density polyethylene. Of points. When pe pipe manufacturers process different types of PE pipes, they choose different resin grades according to their application conditions, and also have different requirements for extruders and molds.
PE pipes for water supply are the replacement products of traditional steel pipes and PVC drinking water pipes. The water supply pipe must bear a certain pressure, usually a PE resin with a large molecular weight and good mechanical properties, such as HDPE resin, should be used. LDPE resin has low tensile strength, differential pressure resistance, poor rigidity, poor dimensional stability during molding and difficult connection, and is not suitable as a material for water supply pressure pipes.
PE’s unique flexibility also enables it to effectively resist underground movement and end loads. On the surface, in terms of strength and rigidity, plastic buried pipes are inferior to cement pipes and metal pipes. However, from the perspective of practical applications, plastic buried pipes are “flexible pipes”. Under correct design and laying construction, plastic buried pipes are not as good as cement pipes and metal pipes. To bear the load together with the surrounding soil. Therefore, the plastic buried pipe does not need to achieve the same strength and rigidity as the “steel pipe”, and it can meet the requirements of mechanical properties in buried use.
At the same time, the pressure relaxation characteristics of polyethylene can effectively consume stress through deformation, and its actual axial stress level is far lower than the theoretical calculation value, and its breaking elongation is generally greater than 500%, and the bending radius can be as small as the pipe diameter. 20-25 times, it is a kind of high-toughness material, which is very adaptable to uneven settlement of the foundation. These characteristics make it the most excellent pipeline to resist earthquake, foundation settlement and temperature difference expansion and contraction.
Post time: Jun-08-2021