How to One Stop Select A Turnkey Plastic (PE, PP, PVC)Dual (Double) Wall Corrugated Pipe Line from China?
The double-wall corrugated pipe equipment for direct extrusion molding is divided into three types according to its material: PE, PP and PVC. The production line‘s configuration includes extruder, corrugated molding machine, spray cooling tank, planetary cutting machine, and blanking rack.
Brief introduction and development of double-wall corrugated pipe equipment
Before China could produce double-wall corrugated pipe equipment, there were less than ten foreign companies producing double-wall corrugated pipe equipment. China’s first PE double-wall corrugated pipe was a production line (diameter 500mm) introduced by Shanxi Plastics General Factory in 1997. With the continuous enhancement of China’s economic strength, some powerful domestic plastic machine companies have begun the research and development of large-diameter double-wall corrugated pipe production lines. On the basis of absorbing foreign advanced production equipment, these enterprises have successfully launched a large-diameter double-wall corrugated pipe production line at the international advanced level through technical research, comparing the advantages and disadvantages of various foreign equipment, and taking advantage of complementary advantages.
Development history of double-wall corrugated pipe equipment
The first generation of technology is the air-cooled cooling setting technology.
Vertical plastic (PE, PP, PVC) double-wall corrugated pipe forming machine
Performance: The inner and outer layers of the corrugated pipe are independently supplied by two extruders, which can realize the production of different colors and different raw materials for the inner and outer layers.
The molding machine is divided into upper and lower machines. The cooling method is a combination of water cooling and air cooling, but it is still air cooling in the traditional sense. It has the function of online flaring.
The second generation technology is the open water-cooled forming technology.
Module cooling cycle: intermittent water cooling
Performance: The forming machine adopts a horizontal structure, shuttle drive, intermittent water cooling, vacuum forming, and supports online double-layer flaring.
The third-generation technology is the sealed pressure water-cooled forming technology.
(Third generation) One-stop Turn-key PE (PP, PVC) double-wall corrugated pipe forming machine
Module cooling cycle: uninterrupted continuous water cooling
Performance: Sealed high-pressure circulating continuous water cooling, high cooling efficiency and higher output. Compared with the air-cooled model and the second-generation intermittent water-cooled model, the output can be increased by 3 times.
The technical key of double-wall corrugated pipe equipment
For the production of high-quality double-wall corrugated pipes, the corrugation forming system plays a vital role, and all the key technologies for producing plastic double-wall corrugated pipes are also concentrated here. The subdivision of corrugated molding system can be divided into three parts: corrugated molding machine, corrugated molding block, extrusion die, cooling and forming system.
First, look at the corrugated forming machine. The function of the corrugated forming machine is to make the corrugated forming block installed on it run continuously and stably and to provide the necessary vacuuming and cooling functions for corrugated forming. In order to make the corrugated molding block run continuously and stably, the design of the module running track of the molding machine is particularly important. The excellent block running track design of the corrugated molding machine can greatly improve the service life of the machine. A good track design should have very little friction. The lower the friction, the lower the wear and the longer the life. In the production of double-wall corrugated pipes, the corrugated molding block also plays a crucial role. First, because the corrugated molding block directly determines the shape of the wave crest, and second, because the manufacturing process of the corrugated molding block directly affects the quality of the pipe.
The die head for producing double-wall corrugated pipe is very different from the die head for producing solid wall pipe due to technological reasons. When producing, on the one hand, the die head is required to have a double-layer flow channel structure, and on the other hand, the requirements for the die head material are relatively high. The ideal material should be the same material as the barrel and screw of the extruder – 38CrMoALA, After nitriding treatment, it has high precision, high strength and good stability. Although the price is high, it is reliable to use and can ensure the product quality of the pipe.
If the die head, the barrel and the screw of the extruder are made of non-standard materials, trouble will accompany the entire life of the machine.
Status Quo of China’s Double Wall Corrugated Pipe Forming Equipment Technology
According to the current double-wall corrugated pipe forming method and pipe wall structure, the diameter of the PVC double-wall corrugated pipe should not be too large, generally 630mm. It is said that some manufacturers can manufacture 1000mm PVC double-wall corrugated pipe equipment, but they have never seen it; and for HDPE double-wall corrugated pipe If the inner diameter is larger than 1000mm, the meter weight will increase significantly, and its cost will greatly limit its application field; in addition, since the double-wall corrugated pipe cannot be used for the current construction without excavation, people have to buy a winding reinforced pipe with a larger meter weight or GRP pipe. Therefore, the development of new structural wall pipes and their forming methods is the next research focus in the field of plastic buried drainage pipes, and it is also an inevitable choice for China to surpass the Western developed countries in the manufacture of buried drainage pipes.
How to select the right turnkey plastic double wall (dual wall) corrugated pipe forming machine(production line)?
There are dozens of manufacturers that claim (advertise) can manufacture plastic double-wall corrugated pipe equipment with good quality, Apart from China, there are not so many manufacturers in the world.
For clients who are planning to purchase equipment, how to choose the right equipment is a huge challenge, after all, the value of this equipment is relatively high. For clients who don’t know much about the situation, some choose the manufacturer based on the size of the manufacturer, thinking that the large-scale one is powerful. If you don’t understand its operating background, you may fall into a trap. Some manufacturers do not have R&D strength, but only get relevant drawings and manufacture plastic double-wall corrugated pipe equipment according to the drawings. This equipment often has problems during operation, resulting in being sued for not being able to deliver products according to the contract. There are other reasons that affect the performance quality of the plastic double-wall corrugated pipe equipment. For HDPE double-wall corrugated pipe equipment some manufacturers produce single-screw equipment, some produce twin-screw equipment, and some produce conical double-screw equipment.
Equipment breakdown with cheap price
China’s vast territory has created huge differences in the characteristics of people in different regions, which leads to very different ways of thinking and behavior and values of people, which in turn affects business behavior. These intangibles cannot be shown on the surface. Foreigners who have little knowledge of Chinese culture think they know China very well, so they often fall into the pitfall and cause losses.
If you are not sure to do a successful sourcing job and just have a need, Chnic can help you do it successfully.
