The three-layer HDPE (High-Density Polyethylene) pipe extrusion line is a specialized production system designed to manufacture pipes with a three-layer structure, typically consisting of an outer and inner layer of HDPE and a middle layer of a different material, such as adhesive resin or recycled HDPE. This construction provides the pipes with enhanced properties such as improved strength, resistance to environmental stress cracking, and barrier properties.
The three-layer HDPE pipe extrusion line typically includes components such as multiple extruders, co-extrusion die heads, a vacuum calibration tank, a haul-off unit, a cutting machine, and a stacker. The process begins with the feeding of HDPE resins into the extruders, where they are melted and then co-extruded through the die heads to form a pipe with the desired three-layer structure. The pipe is then cooled and shaped in the vacuum calibration tank before being pulled and cut to the required length.
The function of the three-layer HDPE pipe extrusion line is to produce pipes with enhanced properties compared to single-layer pipes. The outer and inner HDPE layers provide the pipes with excellent chemical resistance, durability, and smooth surface finish, while the middle layer can offer additional properties such as adhesion, barrier protection, or recycled material utilization. The resulting pipes are suitable for a wide range of applications, including water distribution, gas transportation, and industrial piping systems, where the combination of strength, flexibility, and barrier properties is required.
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