PE pipe with peelable thermoplastic protective layer

For a long time, polyethylene (PE) pipes have been widely used in the construction of many urban pipeline networks, such as natural gas transportation, municipal engineering, industrial production, rainwater recovery, mining operations for their excellent corrosion resistance, good flexibility, simple installation process, and long service life.

However, due to limitations in transportation, loading and unloading construction, environmental factors, etc, traditional excavation and laying of pipes face many challenges:

• How to accurately track and ground settlement?
• How to prevent termites from gnawing and damaging?
• How to prevent electrostatic corrosion?
• How to conduct real-time detection of damaged pipes?
• How to ensure the overall performance of pipes in harsh construction environments?

Ensuring its safe and stable operation while reducing material costs has become a key concern in pipe construction.

PE pipe outer wall coating with peelable thermoplastic protective layer (hereinafter referred to as coating pipe) refers to extruding thermoplastic material coating protective layer on the outside of the working pipe through multi-layer co extrusion technology. The inner PE pipe is mainly responsible for pressure bearing and conveying, while the outer protective layer plays a protective and auxiliary role. It is independent of the working pipe and can be easily peeled off during welding. This design not only improves the durability and safety of the pipes, but also simplifies the construction process, providing pipeline designers with greater choices and opportunities to expand pipeline performance.

Compared with traditional polyethylene pipes, the peelable protective layer on the outside of PE pipes can reduce the initial scratch depth, block cracks from transferring from the outer protective layer to the PE pipe, effectively protect the working pipe, and improve the safety of the pipeline.

Polyethylene will age outdoors due to factors such as ultraviolet radiation, heat, ozone, moisture, industrial hazards, and microorganisms, resulting in discoloration and decreased performance. To ensure pipe performance, the outer coating can effectively resist the aging of the working pipes caused by ultraviolet radiation, greatly extending the service life of the working pipes. In addition, depending on the usage scenario, the outer coating also has extended functions such as anti-static corrosion prevention, termite bite prevention, and location detection.

Pipe coating mold is specialized designed by BAST Pipe Machinery for no excavation required HDPE pipes. Wrap a high hardness scratch resistant protective layer around the standard HDPE pipeline to avoid damage to the pipe surface during transportation and construction, reduce the impact of mechanical damage on the pipeline's service life, and greatly reduce transportation and installation costs. Even under worst construction conditions, it will not cause damage to the pressure bearing layer, we can upgrade and renovate the normal HDPE pipe production line.

The coating mold control is integrated into the extruder, significantly reducing footprint. The base mold is made of 40Cr material, quenched and tempered to ensure irs durability. The flowing surface in contact with the material is polished and electroplated, which not only improves its surface smoothness but also enhances its corrosion resistance.

The outer protective layer of HDPE pipes generally uses harder materials (such as MPP), with a thickness of 0.9mm to 5mm, and increases with the increase of pipe diameter; The outer protective layer can be peeled off to facilitate the welding construction of HDPE pipes.