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Characteristics of PE Pipe Production Lines

Time：

2018-09-14

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 processing is a single-screw extruder. In the design of such an 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 length, melt pressure remains low and evenly distributed, while also maintaining strict…

In the screw design, a combination of BM and barrier‑type configurations 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 structured feed bushing with multiple inclined grooves on the inner surface. For high‑speed PE feeding, a cooling device is incorporated in the feed zone to precisely control the temperature and thermally isolate it from the adjacent high‑temperature section of the barrel. Each barrel section is equipped with controllable heating zones and utilizes forced air cooling. The extruder’s output exhibits excellent linearity, facilitating synchronized adjustment with the take‑up speed. To enable high‑speed extrusion, a high‑torque, low‑noise gearbox is selected, with the motor power appropriately matched.

Cooling and sizing device:

The function of the shaping die is to impart a fixed geometric shape and dimensions to the high‑temperature parison extruded from the die head during the glass transition, while substantially relieving both deformation‑induced internal stresses and thermal internal stresses in the parison, thereby producing finished articles that meet the relevant quality standards. It is a key process unit in the plastic extrusion molding process.

Traction device:

The traction device is an auxiliary component required for the 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 the friction generated during the cooling and shaping process and ensuring that the pipe is drawn out of the cooling‑and‑shaping unit at a uniform rate. By adjusting the traction speed, the wall thickness of the PE pipe can be regulated, enabling the 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, and the use of a traction device also helps improve product quality.

Traction device requirements:

The gripper must be capable of accommodating the processing of tubing with various diameters, offering smooth speed regulation within a specified range and maintaining stable traction throughout the pulling process. Any irregular fluctuations can induce surface waviness in the finished product, compromising quality. The gripping force should be appropriately balanced and adjustable, ensuring no slippage, jerking, or vibration during pulling to prevent deformation of the tubing.