What is PVC Pipe & How is it Produced?

PVC pipe is a kind of synthetic material that is popular and widely used in the world today. Its global usage ranks second among various synthetic materials. PVC materials are extremely versatile, with good processing performance, low manufacturing cost, corrosion resistance, insulation and other good characteristics. 

With large amount production of PVC pipes, PVC pipe extrusion line plays an important role in mass production.

The specific production process is as follows:

Preparation of raw materials + additives → mixing → feeding and feeding → forced feeding → conical twin-screw extruder → extrusion die → sizing sleeve → spray vacuum setting box → immersion cooling water tank → ink printing machine → crawler tractor → knife lift cutting machine → pipe stacking rack → Finished product testing and packaging 

The specific pipe diameter is formulated according to the actual needs of the customer.

PVC pipe production line process:

(1) Raw material mixing: It is to add PVC stabilizers, plasticizers, antioxidants and other auxiliary materials to the high-speed mixer in proportion and process. The materials are heated to the set process temperature by self-friction of the material and then the cold mixer reduces the material to 40-50 degrees; this way it can be added to the hopper of the extruder.

(2) Extruder section: This machine is equipped with a quantitative feeding device, which can match the amount of extrusion and the amount of feeding to ensure the stable extrusion of the product. Due to the characteristics of the conical screw, the feeding section has a larger diameter, and the heat transfer area and shear speed of the material are relatively large, which is conducive to the plasticization of the material. The screw diameter of the metering section is small, which reduces the heat transfer area and the melt. 

(3) Extrusion die part: PVC that has been compacted, melted, and kneaded and homogenized, and subsequent materials are pushed to the die by the screw of PVC pipe machine. The extrusion die is a key component of pipe molding. 　

(4) The vacuum shaping water tank is used for shaping and cooling the pipes. The vacuum shaping water tank is equipped with a vacuum system and water circulation system for shaping and cooling.

(5) The traction machine is used to continuously and automatically lead the cooled and hardened pipe out of the machine head and adjust the speed by frequency conversion. 　　

(6) Cutting machine: After the length switch is controlled by the travel switch according to the required length, automatic cutting is performed, and the frame is delayed to implement the flow production. The cutting machine uses the fixed-length switch signal as an instruction to complete the entire cutting process. The operation is kept synchronized, and the cutting process is completed by electric and pneumatic drives. The cutting machine is equipped with a dust suction device to suck out the debris generated by cutting in time and recover.　

(7) The turning action of the turning rack is realized by the air cylinder through air control. The turning rack is equipped with a limit device. When the cutting saw cuts the pipe, the pipe continues to be transported. After a delay, the cylinder enters the work to realize the turning action to achieve the purpose of unloading. 

In recent years, the sales of PVC pipe production lines have been well. The reason is that UPVC drainage pipes account for about 50% of the output of Chinese plastic pipe industry. It is the most widely used plastic pipe in China.