Chinas rising corrugated pipe forming technology

Plastic corrugated pipe due to the material, light and has excellent physical and chemical properties, in telecommunications, urban construction, agricultural irrigation and road drainage areas such as widely used. Plastic corrugated pipe and technology of China, though started late, but development soon, the overall technology has reached or close to the world's advanced level.

Double-wall corrugated pipe forming machine is refers to the inner surface is smooth and outside wall with corrugated (corrugated shape can be rectangular, trapezoidal and sinusoid, etc.) of plastic pipe. Now China has in the development and application of plastic corrugated pipe, 80% are PVC corrugated pipe. PVC double-wall corrugated pipe besides has all the advantages of ordinary plastic pipe material, but also has many outstanding characteristics: compared with the plate steel tubes, light, low energy consumption per unit length of corrugated pipe quality, the price is cheap; Under the same load condition, because of the double-wall corrugated pipe wall is thin, than the same material, same specification of solid core pipe can save raw materials by 40% to 60%; The corrugated shape of double-wall corrugated pipe can strengthen the load of pipeline on the soil resistance, and increase its flexible, can be continuous cladding is located in the uneven ground; Interface connection convenient and good sealing, easy handling, site construction is very convenient, can reduce labor intensity of construction, speed up the construction; PVC double-wall corrugated pipe service life is long, the outdoor life can be up to 20 years, the underground service life can reach more than 50 years, etc.

Wide prospect of market

According to the national chemical building materials industry "tenth five-year plan and development plan outline in 2010, 2005, in the national new and reconstruction projects, construction of drainage pipe with 70% plastic pipe, building rainwater pipe 50% using plastic pipe, urban drainage pipe 10% using plastic pipe, building water supply, water supply and heating pipe 60% use plastic pipe; 50% 50% of urban water supply pipe with plastic pipe, rural water supply pipe with plastic pipe, city gas pipeline (low pressure pipe) in 20% by plastic pipe, wire sheath pipe 80% using plastic tube. Plastic pipe in the national all kinds of pipes in the market share of 50% or more.

Among them, double-wall corrugated pipe will be promising market in the following:

Is expected in the next 20 years will enter the climax of the construction of drainage pipe network in China, for the plastic underground drainpipe has created an unprecedented development opportunity. PVC double-wall corrugated pipe, with its excellent price performance ratio will go a long way in the field of underground drainage, wide prospect of market. Is expected in 2005 China's architecture and form a complete set of utilities network of double-wall corrugated pipe demand will reach 40000 tons.

The highway matching with wire, cable (cable) to protect casing and threading pipe mainly use PVC material, double-wall corrugated pipe material consumption is growing rapidly in recent years. Is expected in 2005 China double-wall corrugated pipe consumption in electric telecommunication engineering with protecting tube to reach about 25000 tons.

Double-wall corrugated pipe is promising in terms of irrigation and water conservancy, is expected to 2005 in the field of double-wall corrugated pipe demand will reach about 15000 tons.

At present China's industrial and mining with drilling approximately 100000 eyes, filter tube Wells pipe and market demand of about 35 million meters, about 15-200000 tons, the plastic pipe is expected in 2005 to the field of industrial and mining with well tube of double-wall corrugated pipe demand will reach about 15000 tons.

In addition, in all kinds of transportation, communication, water and energy and other infrastructure areas, south and north China coal transport, west to east gas pipeline and the south-north water diversion project, foundation engineering, such as the 2008 Beijing Olympic Games created new opportunities for plastic pipe material, double-wall corrugated pipe as a new type of chemical building materials, has a broad space for development.

The early mainly imports

Direct extrusion molding of double-wall corrugated pipe production line is divided into two kinds of PE and PVC. At present, foreign double-wall corrugated pipe production equipment mainly include: family, Mr Nick, Hector gorer, delos Bach, fu lang, etc.

China plastic corrugated pipe production line imported from the mid - 1980 - s, at present about 30 Chinese PVC double-wall corrugated pipe manufacturers, production is about 30000 tons/year, accounting for about 5% of the PVC pipe production. With small diameter tube accounts for about 90%, more than 600 mm diameter, large diameter pipe is less. Anhui huai suye co., LTD. Is currently China's largest PVC double-wall corrugated pipe production factory, has the introduction of 3, 3000-4000 tons/year production line, can produce the biggest diameter is 800 mm. In addition, in addition to the Shanghai chloride plastic co., LTD has two production lines, other manufacturers, such as henan zhengzhou plastics factory, hangzhou DongGuan group co., LTD., hangzhou union carbide cable co., LTD., shanxi aluminum factory, tianjin, jiangsu Milky Way group, zhejiang shangyu chemical plant plastic machinery factory, kunshan delos plastic co., LTD., dalian three plastic company and shanxi plastic factory 1 production line.

China PVC double-wall corrugated pipe production line is given priority to with imported units, the major suppliers of foreign PVC double-wall corrugated pipe forming machine and Canada have Germany UNICOR, DROSSBACH CORMA company, etc.; In addition, the south Korean mountain, such as Ming machinery and yu state industrial enterprises are also in promoting its production equipment and technology to China.

In 1996 China began to introduce from abroad large diameter HDPE double-wall corrugated pipe production line of complete sets of processing, plastic factory in Shanxi Province was the first to introduce Canada division (CORMA) production line, then the anhui huai company introduces Germany unika (UNICOR) production line, by 2001 has been nearly ten companies of large diameter HDPE double-wall corrugated pipe market, production line introduced from abroad in succession, the incomplete statistics to see the table above.

Domestic technology mature gradually

Though the plastic corrugated pipe equipment and technology of China starts relatively late, but the overall is at or near the world level.

Dalian third base is the earliest developed Φ 90 - Φ 160 mm double-wall corrugated pipe production line manufacturers, decade to maintain domestic sales of the first performance. Develop Φ 200-2001 Φ double-wall corrugated pipe production line of 500 mm, managed to fill the domestic blank. Φ 200 - Φ 800 PE double-wall corrugated pipe equipment structure of the bedroom, shuttle transmission, Siemens CNC control, servo motor, the online double flaring, closed water cooling, etc. Third base company and in 2004 successfully launched Φ 500-800 MMPVC Φ double-wall corrugated pipe production line and 1500 mmpe Φ large-caliber double-wall corrugated pipe production line.

In January 25, developed by dalian third base company designed the first domestic Φ 1000 mmhdpe double-wall corrugated pipe production line, went into operation in chongqing guotong pipe cable company, marked the domestic machinery for a new milestone. Φ 1000 mm HDPE double-wall corrugated pipe production line, advanced design concepts, technology is mature, performance is remarkable, is the 800 mm Φ HDPE double-wall corrugated pipe production line after succeeded once again in to fill the blank of domestic plastic machinery industry.

Recently, hangzhou doa suye co., LTD. Production of DN800 large-diameter rigid polyvinyl chloride (PVC -u) double-wall corrugated pipe by zhejiang provincial scientific and technological achievements appraisal. PVC -u double-wall corrugated pipe as a new type of municipal sewage pipe with pipe material, environmental protection, energy saving, corrosion resistance, easy installation, short construction period, connecting sealing good, long life and other advantages, more and more get the welcome of the market. Hangzhou doa company is China's PVC -u structure wall pipe is one of the large-scale production enterprises, the company according to market demand, relying on its own strong technical force and many years engaged in production of pvc-u pipe processing experience, dalian third base company equipment and domestic PVC raw materials, can effectively solve the several technical difficulties in the process of PVC material processing, successfully developed DN800 large diameter PVC -u double-wall corrugated pipe material, the technology has been reporting several national patents.

Dalian plastics research institute since 1989 to develop of double-wall corrugated pipe unit, in the domestic first developed advanced level forming unit, the cost is only about a quarter of the imported equipment, the introduction of prototype level performance and has the advantages of low investment, quick effect, high economic benefits, the characteristics of the products tested in performance introduced equipment production level of pipes. Double-wall corrugated pipe forming unit was rated as state-level new products, and won the municipal science and technology progress award. Rigid PVC, HDPE material such as single wall or double wall corrugated pipe, specifications from from 3 mm to 160 mm, single wall corrugated pipe units in the country has only nearly hundred, double-wall corrugated pipe has transferred more than 70 units. In order to make the technology can meet the requirements of different manufacturers, dalian plastics research institute developed a double screw type and two single screw type. Double screw machine can meet the requirements of production hard PVC double-wall corrugated pipe. Two single screw machine is adapt to HDPE double-wall corrugated pipe production, the main features are less investment in equipment, production is easier to control.

In fact, the domestic about the research and development of large diameter double-wall corrugated pipe production line is only in recent years is just beginning. In 2001 by wuxi bridging company began to introduce the foreign advanced technology to develop the first china-made large diameter HDPE double-wall corrugated pipe production line, and put into production in jiangyin "silver dalai lama" company, and then the second production line in wuxi hai jie put into production, the third, four, five production lines, respectively, in tianjin broadcom, jiaozuo, zhuji, zhejiang sea bright production, then the shandong cloud in the introduction of foreign technology to produce qualified production line. From 2001 to 2003 at the end of the cloud in wuxi bridging, shandong, Shanghai Jin Wei enterprises launched more than 20 production line put into production in succession. Successful development of the domestic equipment makes the equipment cost reduced from more than 2000 ten thousand yuan to 2000-6 million yuan, for China's large-diameter plastic armband in the promotion of buried pipe.

Technology still need to continue to ascend

The main production equipment has a double-wall corrugated pipe production extruder, head, corrugated molding machine, cutting machine, belling machine, etc, the core equipment for the nose and corrugated molding machine.

Complicated structure of double-wall corrugated pipe extrusion, the main characteristic is in the same mold with two layers inside and outside, inside and outside the port flux compressed air between the interlayer and the default path set need cooling system. To compensate the heat loss of cooling water through the cause at the same time, generally need heating rods, and in large diameter pipe production, still need to adopt double-layer co-extrusion technology. At present, the domestic production of the nose, its design has reached the level of the head abroad, large-caliber polyolefin pipes of double-layer co-extrusion head has been developed, but its material used and the level of processing and gap compared with foreign products. Performance on the surface of the flow channel that domestic head vulnerability, the production and touch cycle shorter than head abroad.

Corrugated molding machine is the core of plastic double-wall corrugated pipe production equipment, by forming module, the transmission system, control system of three parts. Corrugated molding machine has two kinds of vertical and horizontal, vertical corrugated molding machine cover an area of an area small, compact structure, module replacement more difficult. Horizontal corrugated molding machine its forming module level operating, covers an area of large, but far more convenient than vertical replacement module, due to the wider than its application.

Domestic production of corrugated pipe forming machine, general is horizontal structure, large diameter pipe also USES bracket type module. But limited by its processing equipment, the machining accuracy and identity of module and gap, compared with similar foreign products in the production of machine fault is more, sometimes may cause of the orbits of the module and the damage.

Although domestic corrugated pipe forming machine in some ways it is better to imported products, but with much lower prices than similar foreign products, and production of tubes can meet the requirements, therefore, in recent years the domestic most of the corrugated pipe production factory or domestic production lines. For the domestic equipment manufacturers to provide more opportunities for development. Although in recent years the rapid development of China double-wall corrugated pipe processing equipment, but also should be raised in the level of processing and new product development direction such as strengthening work, as soon as possible to narrow the gap with foreign products.

Double-wall corrugated pipe in China since its introduction in the early 1990 s, the production and demand is increasing year by year, also by all imported from abroad, so far, the basic components of meet the demand of the domestic market. Nevertheless, China's double-wall corrugated pipe production equipment in the level of processing, precision mold, new product development and still exists certain gaps when compared with the international advanced level, to study the introduction of new technology, strengthen the research and development, to better meet the demand of domestic market, further expand the international market will be China's efforts in the direction of the double-wall corrugated pipe equipment production enterprise.