Analysis of technical characteristics of plastic pipe industry

Plastic and traditional materials are different, the pace of technological progress is faster, and the emerging new technology, new materials and new processes make the advantages of plastic pipe compared with traditional materials more and more prominent. Compared with the traditional metal pipe and cement pipe, the plastic pipe is light in weight, generally only 1 / 6-1 / 10 of the metal pipe, with better corrosion resistance, impact resistance and tensile strength. The inner surface of the plastic pipe is more smooth than the cast iron pipe, with small friction coefficient, small fluid resistance, which can reduce the water transmission energy consumption by more than 5%. The comprehensive energy saving is good, and the manufacturing energy consumption is reduced by 75%. The transportation is convenient and the installation is simple, The service life is up to 30-50 years. Polyethylene pipe is developing rapidly all over the world. The developed countries have a comparative advantage in the field of water supply and gas.

According to the market research center, polyethylene pipe is not only widely used to replace the traditional steel pipe, cast iron pipe, etc., but also to replace PVC pipe. The reason lies in the technological innovation of polyethylene pipe. On the one hand, the material has made great progress. Through the improvement of polyethylene polymerization process, the strength of polyethylene pipe special material has almost doubled. On the other hand, the application technology has new development. For example, the technology of laying polyethylene pipe by directional drilling method without excavation of pipe trench gives full play to the advantages of polyethylene pipe, so that the traditional pipe has no competitiveness in the situation suitable for this method. There are many new materials, new technologies are under study, or have been developed and are being tested. It is certain that the technological progress of plastic pipes in the next 10 years will promote the rapid development and wider use of plastic pipes.

UPVC pipe

In the world, UPVC is a kind of large consumption in all kinds of plastic pipes, and it is also a new type of chemical building material which is developing vigorously at home and abroad. The adoption of this kind of pipe can play a positive role in alleviating the situation of steel shortage and energy shortage in China, with remarkable economic benefits.

UPVC pipe has the following characteristics:

Good chemical corrosiveness, no rust;

Self extinguishing and flame retardant;

It has good aging resistance and can be used between - 15 ℃ - 60 ℃ for 20-50 years;

The inner wall is smooth, and the surface tension of the inner wall makes it difficult to form scale;

Light weight, easy expanding, bonding, bending, welding and installation work is only 1 / 2 of steel pipe, low labor intensity and short construction period;

The volume resistance is 1-3 × 105 Ω. Cm, and the breakdown voltage is 23-2kv / mm;

Low price;

Saving metal energy;

UPVC pipe has low toughness, large coefficient of linear expansion and narrow temperature range.

Core foam pipe (PSP)

The core layer foam pipe is a new type of pipe produced by three-layer coextrusion process, the inner and outer layers are the same as the common UPVC, and the middle layer is a low foam layer with a relative density of 0.7-0.9. Due to the use of type I structure principle in material mechanics and the foam core layer with energy absorption and sound insulation effect, it has gradually become a kind of plastic pipe instead of cast iron pipe and rigid PVC solid wall pipe.

PSP has the following characteristics:

The impact strength is significantly improved: its circumferential rigidity is 8 times that of ordinary UPVC pipe.

Wide range of application: it can be used at - 30 ℃ - 100 ℃, and has good dimensional stability when the temperature changes.

Foam core layer can effectively block the spread of noise, which is more conducive to the drainage system of high-rise buildings.

The heat insulation is good, and the heat transfer efficiency is 35% lower than that of the solid wall pipe without foaming.

The foam core layer greatly improves the compressive strength of its inner wall.

Compared with the solid wall pipe, it can save more than 25% of raw materials, and save more raw materials when the caliber is larger.

The pipe is light and easy to transport and install.

The service life of the bending tube is longer than that of the solid wall tube for more than ten years.

PVC silencing pipe

UPVC silencing pipe is a new type of building drainage pipe developed in the early 1970s in South Korea. It has obtained patents from Japan, Germany, France, Switzerland and other countries, and China in 1990. There are six triangular convex helices on the inner wall of the UPVC silencing pipe, which make the water flow continuously and freely along the inner wall of the pipe and form a better drainage condition by rotating the drainage, so as to play a good energy dissipation role at the bottom of the riser and reduce the noise. At the same time, the unique structure of the silencing pipe can make the air form a column in the center of the pipe to discharge directly. There is no need to set up a special vent pipe as before, so that the drainage and ventilation capacity of the high-rise building can be increased by 10 times, the drainage volume can be increased by 6 times, and the noise is 30-40db lower than that of the ordinary UPVC Drain pipe and cast iron pipe. When UPVC silencing pipe and silencing pipe are used together, the drainage effect is good.

Upv silencing pipe has the following characteristics as well as upv characteristics:

High capacity of water supply and fluid transportation;

High ventilation capacity;

Noise reduction and sound insulation;

Economy and energy saving;

Easy to construct and maintain;

It can bear temperature and settlement deformation of buildings. There is no expansion joint.

UPVC silencing pipe is mainly used for drainage pipe system, especially for high-rise building drainage pipe system.

Plastic bellows

In the structural design of plastic bellows, a special "ring groove" shaped cross-section is adopted. This kind of pipe is novel in design and reasonable in structure, which breaks through the traditional "plate" structure of ordinary pipe, and makes the pipe have enough compressive and impact strength