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Components of a PVC Pipe Production Line and the Functions of Each Section

Time：

2017-07-27

The plastic pipe production line mainly consists of a plastic extruder, a sizing tank, a belt‑type haul‑off unit, an automatic cutting saw, and a winder. It is primarily used for manufacturing plastic pipes and profiled sections in various specifications, producing pipes of diverse 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. Its barrel and screw are specially designed to ensure efficient extrusion and excellent plasticization. (1) Raw material mixing: This involves proportioning and processing PVC stabilizers, plasticizers, antioxidants, and other additives according to specified ratios and process requirements.

A plastic pipe production line primarily consists of a plastic extruder, a sizing tank, a belt-driven haul-off unit, an automatic cutting saw, and a winder.

The plastic pipe production line is primarily used for manufacturing plastic pipes and profiled extrusions in a wide range of specifications. It produces pipes of 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, OVC, and PPC. Its barrel and screw are specially designed to ensure efficient extrusion and excellent plasticization.

(1) Raw material blending: PVC stabilizers, plasticizers, antioxidants, and other additives are sequentially fed into a high-speed mixer in specified proportions. The friction between the materials and the mixing equipment raises the temperature to the set process level, after which a cooling mixer reduces the temperature to 40–50°C. At this point, the blend can be transferred to 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 head, achieving compaction, melting, and uniform mixing, while also facilitating venting and dehydration. The feed system and the screw drive are both controlled by variable-frequency drives, enabling synchronized speed regulation.

(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 positioning and vertical height.

(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.