The PVC pipe production line features a reliable structure, a high degree of automation, and straightforward operation, ensuring stable continuous production.

The PVC pipe production line comprises a control system, an extruder, a die head, a sizing and cooling system, a haul-off unit, a planetary cutting device, and a material‑turning rack. It is used to manufacture plastic pipes and profiles in a wide range of specifications, primarily producing pipes with various diameters and wall thicknesses for agricultural water supply and drainage, building water supply and drainage, and cable‑laying applications. The line is suitable for processing resin‑based materials such as PP, PE, PS, ABS, PVC, and PPC. The PVC pipes produced on this line exhibit excellent rigidity and strength, while also offering good flexibility, creep resistance, resistance to environmental stress cracking, and superior hot‑melt welding performance.

PVC pipe production lines are characterized by the following features: excellent quality and a long service life; simple operation, requiring no specialized training; and robust physical and mechanical properties, making them well-suited for transportation.

(1) Raw material blending: PVC stabilizers, plasticizers, antioxidants, and other additives are sequentially added to a high-speed mixer in accordance with specified proportions and processing sequences. The friction between the materials and the mixing equipment raises the temperature to the set process target; the mixture is then transferred to a cooling mixer to reduce its temperature to 40–50°C, at which point it can be fed into the extruder hopper.

(2) Extruder Section: This machine is equipped with a metering feed system that ensures the extrusion rate matches the feed rate, enabling stable production. Thanks to the conical screw design, the feeding section features a larger diameter, providing a greater heat-transfer surface area and higher shear rates, which facilitate material plasticization. In contrast, the metering section has a smaller screw diameter, reducing both the heat-transfer area and the shear rate on the melt, thereby allowing extrusion at lower temperatures. As the screw rotates within the barrel, it plastifies the PVC compound and conveys it toward the die, achieving compaction, melting, and uniform mixing, while also facilitating venting and dehydration. The feed system and screw drive are both equipped with variable-frequency drives, enabling synchronized speed control.

(3) Extrusion die section: The PVC, which has been compacted, melted, and homogenized through mixing, is conveyed by the screw to the die. The extrusion die is a critical component for pipe formation.

(4) The vacuum shaping water tank is used for shaping and cooling tubular products. It is equipped with a vacuum system and a water circulation system for shaping and cooling, features a stainless steel tank body, and employs circulating water spray cooling. Additionally, the tank is fitted with a front–rear traversing mechanism as well as manual adjustment devices for lateral and vertical positioning.

(5) The traction machine is used to continuously and automatically draw the cooled, hardened pipe material out from the die head, with variable-frequency speed control.

(6) Cutting machine: After being controlled by a limit switch according to the required length, it performs automatic cutting and, following a delay, flips the pipe rack to enable continuous production. The cutting machine uses a fixed-length limit switch signal as its command to complete the entire cutting process, maintaining synchronization with the pipe‑material feed throughout. The cutting operation is driven by both electric and pneumatic systems. Additionally, the machine is equipped with a dust‑extraction system that promptly removes and recovers the cuttings generated during the process.

(7) The material‑turning action of the material‑turning rack is controlled by a pneumatic cylinder via a compressed‑air circuit. The rack is equipped with a limit switch: after the cutting saw has severed the pipe, the pipe continues to be conveyed; following a delay, the cylinder activates to perform the turning motion, thereby completing the unloading process. After unloading, the system automatically resets after a few seconds of delay, awaiting the next cycle.