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Characteristics of PE Pipe Production Lines

Time：

2018-10-30

The PE pipe production line consists of a feeding system, a single-screw extruder, a PE pipe die, a sizing and cooling system, a haul-off unit, a winding machine, and a control system. Among these components, the extruder is one of the core elements; the primary machine used for pipe processing is a single-screw extruder. In the design of the single-screw extruder, achieving high-speed extrusion of pipes at low processing temperatures represents a key technological challenge. To address this, the screw design combines a BM configuration with a barrier-type structure and incorporates an additional mixing section, ensuring thorough plasticization of the pipe parison. Moreover, throughout the entire screw, melt pressure remains low and evenly distributed, while also maintaining strict…

A PE pipe production line consists of a feeding system, a single-screw extruder, a PE pipe die, a sizing and cooling system, a haul-off unit, a winder, and a control system. Among these components, the extruder is one of the core elements; the primary machine used for pipe extrusion is a single-screw extruder. In the design of such an extruder, achieving high‑speed extrusion of pipes at low processing temperatures represents a critical technological challenge.

In the screw design, a combination of BM and barrier‑type structures is employed, with an additional mixing section added to ensure thorough plasticization of the parison. Moreover, throughout the entire screw, melt pressure remains low and evenly distributed, while shear is tightly controlled to achieve optimal material temperature.

In the barrel design, a slotted barrel is employed, featuring a structurally engineered feed bushing with multiple inclined grooves on the inner surface. These grooves facilitate high‑speed PE feeding. A cooling device is incorporated in the feeding zone to precisely control the temperature of this section and thermally isolate it from the adjacent high‑temperature barrel region. Each barrel section is equipped with controllable heating zones and utilizes forced air cooling. The extruder’s output exhibits excellent linearity, enabling synchronized adjustment with the take‑up speed. To support high‑speed extrusion, a high‑torque, low‑noise gearbox is used, with the motor power appropriately matched to the system.

Cooling and sizing unit: The shaping die ensures that the high‑temperature parison extruded from the die head attains a stable geometric shape and dimensions during the glass transition, while substantially relieving both deformation‑induced internal stresses and thermal internal stresses, thereby producing finished parts that meet the relevant quality standards. It is a key process component in plastic extrusion molding.

Traction Device: The traction device is an auxiliary component in continuous extrusion of plastic pipes. Its function is to apply a controlled pulling force and speed to the PE pipe as it exits the die, thereby overcoming friction during the cooling‑and‑setting process and ensuring the pipe is drawn out of the cooling‑and‑setting unit at a uniform rate. By adjusting the traction speed, the wall thickness of the PE pipe can be regulated, enabling production of pipes that meet specified standards. Practical experience has shown that plastic pipes produced without traction exhibit significantly lower tensile strength compared to those produced with traction; moreover, incorporating a traction device during manufacturing can further enhance product quality.

Traction device requirements: The gripper must be capable of accommodating the processing of various pipe diameters, with smooth speed regulation within a specified range and stable traction speed throughout the process. Any irregular fluctuations can cause surface waviness in the finished product, compromising quality. The traction clamping force should be moderate and adjustable, ensuring no slippage, jerking, or vibration during operation to prevent deformation of the pipe.