What are the factors that affect the performance and service life of PE pipe equipment?

The material performance of PE pipe equipment is the innate foundation to ensure quality. The molecular weight of the resin and its distribution range have a great influence on the performance of the product. The lower the molecular weight, the wider the distribution range, and the greater the MI (melt flow rate) reflected. The higher the compression density and shear plasticization, the worse the strength of the pipe, the shorter the service life, and the prone to many quality problems such as pipe burst and rapid aging. Therefore, domestic well-known floor heating companies generally use high-quality imported XL1800, 8100X and other PE-Xa special resins, and MI (190℃, 21.6kg) is about 2g/10mm.

Large diameter PE winding sewage pipe flared injection pipe fitting equipment

If domestic LLDPE7042 is used to produce PE-Xa pipes, the cost is low, but due to too large MI, low molecular weight and low density, resulting in poor strength, fast aging, and short service life, it is easy to burst after use, so that rework and cut the pipe Reinstallation is inevitable. The resin has high volatile content, and there will be small holes on the surface or hidden places of the pipe, forming different degrees of stress concentration, affecting the high temperature resistance of the product and shortening the service life.

Therefore, in addition to requiring the volatile matter of the resin processing enterprise to be qualified, the PE pipe production line cannot be wetted by water or contaminated by other things during transportation and storage.

At the same time, it is necessary to ensure the time and uniformity of raw material mixing, generally controlled at 15min, and pay attention to the order and skills of feeding, so that the resin and various additives are evenly dispersed, in order to ensure stable product performance and long service life.

PB plastic pipe extrusion line

The amount of cross-linking agent added must be accurate, and the degree of cross-linking needs to reach a certain height, which not only meets the standard requirements, but also the quality of the cross-linking agent is stable.

If the performance of the cross-linking agent is poor, only a large amount can be added to ensure the degree of cross-linking. The residual monomer after cross-linking will affect the performance of the product, thereby affecting the service life.