High-Efficiency HDPE Jacket Pipe Extrusion Line with Vacuum Calibration and Dust-Free Cutting for Pre-Insulated Pipe Production Line

The HDPE jacket pipe and pre-insulated pipe production line is designed to manufacture thin-wall HDPE outer protective pipes for polyurethane foam prefabricated directly buried insulation pipes. The line adopts vacuum calibration technology to ensure stable operation, smooth surfaces, and uniform wall thickness.

Equipped with a PLC control system, the production line is easy to operate and highly automated. Its high-speed, efficient performance helps reduce production costs while meeting environmental protection and energy-saving requirements.

The pre-insulated pipe consists of a working steel pipe for medium conveyance, a polyurethane (PU) insulation layer for thermal insulation, and an outer HDPE protective jacket that protects the insulation layer and ensures a neat pipe appearance.

1. Hopper dryer  |  2. Single screw extruder  |  3. Extrusion mould die  |  4. Head bracket  |  5. Vacuum calibration device  |  8. Water cooling tank  |  9. Haul-off  |  10. Planetary cutting machine  |  11. Pipe bracket  |  12. Loader

The single screw is fitted with a barrier and mixing head, and the new-model barrel features slotting (channel). Together these ensure good jellification, large output, and stable performance.

The die-head is mainly composed of a mandrel, neck mold, spiral body, cover, die-head body, bolts, and heating rings. The inside surface contacting plastic materials is polished and chrome plated to ensure smooth material flow and prevent rusting. Pipe wall thickness uniformity can be adjusted via bolts. The copper calibrating sleeve fixed in the die-head cools the fresh pipe and calibrates the pipe outer diameter.

The vacuum calibration tank is mainly composed of a frame, stainless steel tank, vacuum system, spray cooling system, and position adjustment device. The vacuum pump exhausts air from the sealed tank to pressurize the fresh pipe against the calibrating copper sleeve and calibrate the outer diameter. Spray nozzles spray cooling water from all directions onto the pipe surface to cool it promptly.

The haul-off machine is mainly composed of a driving device, tracks, clamping structure, adjusting system, side plate, and foundation bed. Haul-off tracks are driven by an AC motor with frequency conversion control to adapt to different extrusion speeds. An automatic length measuring device enables cutting at the set length.

The cutter adopts a blade punching principle to achieve no-dust cutting. It is mainly composed of a cutting device, clamping device, structure synchronous movement device, and frame.

The complete line can be controlled by PLC with a user-friendly human-machine interface. All technical parameters can be set and displayed on the touch screen. The control system can be designed according to customer requirements.

The table surface is made of stainless steel. It adopts pneumatic overturn and automatic discharging.

A circulating double-chain conveyor and assembly machine that continuously feeds steel pipes into PE jackets, with mechanical control and horizontal installation.

• Complete turnkey production solutions, including design, installation, commissioning, and training
• Extensive global production line experience shared with customers
• Supported by a team of senior professional engineers
• Equipped with a national-level plastic machinery expert workstation in China
• 80+ invention and utility model patents
• 50+ exporting countries and regions, with 70% overseas customers

• District heating and cooling pipeline systems
• PU foam pre-insulated steel pipes
• Oil and gas thermal insulation pipelines
• Industrial heat transmission pipelines
• Municipal underground pipeline protection

Qingdao Huashida Machinery Co., Ltd. is a professional manufacturer of plastic pipe production lines, municipal pipeline equipment, pipe insulation and anti-corrosion equipment, and pipeline jointing and anti-corrosion materials.

1. HDPE Jacket Pipe Extrusion Line for Pre-Insulated Pipes (110–2000 mm)
2. Rigid Pre-Insulated Pipe Production Line
3. Flexible Pre-Insulated Pipe (PERT) Production Line
4. Steel Pipe FBE / 2LPE / 3LPE Anti-Corrosion Coating Line
5. Steel Pipe Derusting and Surface Treatment Line
6. PE Pressure Pipe and Water/Gas Supply Pipe Production Line
7. PP/PE Plastic Board, Sheet and Geomembrane Production Line
8. NBR/PVC Thermal Insulation Tube and Sheet Production Line
9. Pipeline Anti-Corrosion Materials and Equipment, including heat-shrinkable joint sleeves, electrofusion joint sleeves, portable welding guns (extruders), and PE/PP welding rods

We have established long-term cooperation with more than 400 overseas customers and exported our products to Kazakhstan, Uzbekistan, Iran, Turkey, Russia, Nigeria, and many other countries and regions.