PE plastic pipe extrusion equipment

PE plastic pipes are a very common type of plastic pipe; in fact, most conduit pipes we encounter are made of PE. During production, the raw materials are first processed into plastic pellets according to the product formulation, and then extruded by an extruder into the desired pipe shape. Typically, PE pipes are rigid, and their physical properties must be carefully controlled through formulation adjustments tailored to the specific application. Based on the formulation, various raw materials are blended in a kneader before being fed into a pelletizing machine to produce pellets. The pellets enter the extruder’s barrel via the feeding system, where they are heated and plasticized. The screw then subjects them to shearing, compression, and thorough mixing. At the die head of the pelletizer, hot‑cutting dies perform rotary cutting to form the final pellets. Plastic pellets serve as the feedstock for manufacturing plastic pipes. They are conveyed into the extruder’s barrel through the feeding system, where the screw further processes them, and finally extruded at the die head into the desired pipe profile. The finished product is then shaped and stabilized with the aid of vacuum‑forming dies and a vacuum‑forming table. Different types of plastic pipes require distinct forming processes during production, so it is essential to select the appropriate method based on the specific product category.

1. Functions of PVC Pipe Production Line Equipment

Raw material blending: PVC stabilizers, plasticizers, antioxidants, and other auxiliary additives are sequentially fed into the mixer in specified proportions and according to the process sequence. The friction between the materials and the mixing equipment raises the temperature to the set processing level, after which a cooling mixer reduces the temperature to 39–49°C. At this point, the blend is ready to be loaded 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. 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 surface area and the shear rate on the melt, 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 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-to-back 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. Automatic Cutting Saw: After the stroke limit switch controls the cut to the required length, the saw 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‑conveying system throughout. The cutting operation is driven by both electric and pneumatic actuators. Additionally, the machine is equipped with a dust‑extraction system that promptly removes and recovers the cutting debris.

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.

1. Functions of PVC Pipe Production Line Equipment

Raw material blending: PVC stabilizers, plasticizers, antioxidants, and other auxiliary additives are sequentially fed into the mixer in specified proportions and according to the process sequence. The friction between the materials and the mixing equipment raises the temperature to the set processing level, after which a cooling mixer reduces the temperature to 39–49°C. At this point, the blend is ready to be loaded 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. 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 surface area and the shear rate on the melt, 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 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-to-back 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. Automatic Cutting Saw: After the stroke limit switch controls the cut to the required length, the saw 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‑conveying system throughout. The cutting operation is driven by both electric and pneumatic actuators. Additionally, the machine is equipped with a dust‑extraction system that promptly removes and recovers the cutting debris.

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.