OPVC Pipe Extrusion Line

PVC-O, The Chinese name for biaxially oriented polyvinyl chloride is the latest evolution of PVC pipes. The pipes are manufactured through special orientation processing technology, and the PVC-U pipes produced by extrusion method are subjected to axial and radial stretching, so that the PVC long-chain molecules in the pipes are arranged in a regular manner in the biaxial direction, resulting in a new type of PVC pipe with high strength, high toughness, high impact resistance, and fatigue resistance.

Many polymer molecules can be arranged in a regular manner through orientation processing (also known as orientation), which can significantly improve their properties. In fact, the competitive advantage of many plastic products in the market relies on the excellent performance brought by oriented processing, such as fibers, biaxially stretched films, containers, etc. The orientation processing technology can improve the performance of pipes on the one hand, and reduce material consumption on the other hand, which is a cutting-edge technology that conforms to the direction of sustainable development. Biaxially oriented polyvinyl chloride (PVC-O) pipes are manufactured through a special orientation processing technology. This processing technology involves axial and radial stretching of PVC-U pipes produced by extrusion, so that the long chain molecules of PVC in the pipes are arranged in a regular manner in the biaxial direction, resulting in a new type of PVC pipe with high strength, high toughness, high impact resistance, and fatigue resistance. Its performance is far superior to ordinary PVC-U pipes. Research and development of PVC-O pipes can greatly save raw material resources, reduce costs, improve product performance, and have significant economic and social benefits.

In the early days, the "offline" processing technology (two-step processing method) was used to orient the extruded and cooled PVC-U pipe segments (thick blanks) by heating and pressure expansion to the required size inside the mold. Experimental research and practical application have proven that PVC-O has extraordinary performance, but the "offline" processing technology has low production speed, high equipment investment, and is difficult to promote. Later, it was developed to orient PVC-O in an "online" manner during extrusion processing, allowing for continuous production of PVC-O. The production process is a one-step processing method, which involves extruding PVC-U pipes (thick blanks) on the pipe extrusion production line to achieve biaxial orientation through radial expansion and axial stretching, and then cooling and shaping them into PVC-O pipes. The "online" biaxial orientation production process greatly improves production efficiency, reduces manufacturing costs, and enhances the competitiveness of PVC-O and other pipes.

Due to the fact that PVC-O pipes are subjected to axial and radial stretching of the originally formed PVC-U pipes, the wall thickness of the pipes is relatively thin. Compared with PVC-U, PVC-O water supply pipes can reduce wall thickness by 35% -40%, greatly saving materials and reducing costs.

After biaxial stretching, the impact strength of PVC-U water supply pipes increased by more than 10 times. Another advantage of PVC-O pipes is that due to higher design stress, they increase water flow capacity, making them easier to handle and lay.

The changes and developments in the international situation have provided an unprecedented historical opportunity for the development of China's PVC pipeline system. The sharp rise in oil prices has had a serious impact on polyolefin pipeline systems that compete with PVC pipeline systems in many application fields, while coal based PVC has enhanced its competitiveness by maintaining lower prices. The PVC pipeline system has a development history of nearly 70 years. Due to its advantages such as high modulus, high strength, and low price, it has always been the most widely used plastic pipeline system in the world and has been widely used in many fields of modern society. The plastic pipeline industry in China has developed rapidly and has become one of the major countries in the world for the production and application of plastic pipelines. The production capacity of PVC pipes in China is over 2 million tons per year, accounting for only about 50% of the total plastic pipe production. In developed countries, the consumption of PVC pipes generally accounts for 70% -80% of the plastic pipe market. In the 21st century, PVC pipes face many competitors, especially due to significant improvements in the performance of resins such as HDPE (such as from PE63 to PE80 and PE100). PE pipes have excellent toughness and resistance to water hammer impact. In addition, the criticism of chlorine by environmental protection organizations in various countries has put PVC pipes in a serious situation. However, what people have long overlooked is that PVC pipes are more effective in preventing the penetration of some toxic and harmful substances compared to PE pipes. In the future world pipe market, PVC pipes will still dominate, and the fundamental reason lies in technological innovation and progress. The application of innovative technologies in PVC resin and PVC pipes, especially the innovation in PVC pipe processing technology and processes, has significantly improved the economy of PVC pipes and opened up new application areas. So, it is necessary to save materials while improving the performance of PVC pipes to enhance their competitiveness.

Conclusion: Due to its extraordinary versatility, outstanding durability, and economy, PVC will still be the preferred material for pipes in the future. As a new type of pipe material, PVC-O has the advantages of good performance, low cost, light weight, easy handling and laying. Its super strong performance allows it to be applied to higher pressures and more harsh environments.

PVC-O pipe extrusion machine can produce PVC-O pipe size range from Ø110 to Ø630mm for PN5 to 25, and Material Class 315 to 500. PVC-O pipe (biaxially oriented polyvinyl chloride pipe) can be used for water supply, minging, gas supply, etc. We use one step forming method to produce PVC-O pipe which has advantage of less space, low electricity and labor cost, less material waste. OPVC pipe making machine performance 1.Replacement molds can produce pipes with different diameters. 2.With a set of molds to produce two or four tubes at the same time. Increased production efficiency. 3.More cost-effective production line. 4.Greatly saving the use of the factory space. 5.High energy efficiency. Just a set of power systems. 6.Can significantly reduce the number of operators. 7.Simple operation.

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