Jwell HDPE (High-Density Polyethylene) pipe production line is a set of professional equipment integrating automation, continuous operation and high precision. Its core function is to process HDPE resin pellets through a series of technological procedures, and extrude them into HDPE pipes that meet various industrial standards.

With the advantages of high efficiency, energy saving and stable operation, this production line is widely applied in municipal water supply and drainage, gas transportation, industrial fluid conveyance, agricultural irrigation and other fields. It can manufacture HDPE pipes with a diameter range from 16mm to 3300mm and wall thickness up to 200mm. It meets the demands of conventional pipeline projects and special engineering scenarios such as large-diameter and thick-wall pipes, serving as one of the core equipment in the modern pipe manufacturing industry.

1. Core Components and Functions of the Production Line

The overall operation of the HDPE pipe production line relies on the coordination of each unit, forming a complete closed-loop production process from raw material handling to finished product output. It consists of six core systems:

1.1 Raw Material Handling System

As the starting point of production, the raw material handling system directly determines the basic quality of pipes. It is mainly composed of vacuum loader, dryer and high-speed mixer.

· The vacuum loader conveys HDPE pellets from the storage silo to the drying system through negative pressure adsorption, avoiding pollution and moisture absorption during transportation.

· The hopper dryer effectively removes moisture from HDPE pellets to prevent defects such as bubbles and pinholes during extrusion, ensuring the compactness of pipes.

· The mixer fully blends HDPE raw materials with color masterbatch and functional additives (UV stabilizer, flame retardant, anti-aging agent) to guarantee uniform composition, meeting requirements for color and special properties such as UV resistance and flame retardancy.

High-end production lines are equipped with gravimetric dosing systems to further improve weight per meter accuracy and optimize pipe quality.

1.2 Extrusion System (Core of the Production Line)

The extrusion system is the core link of HDPE pipe forming, mainly composed of a single-screw extruder. Key components include hopper, screw & barrel, heating system, cooling system and drive unit. Its performance directly decides the plasticization quality and production efficiency of pipes.

The mainstream configuration adopts a 40:1 length-to-diameter ratio screw and barrel. Compared with the traditional 38:1 model, it increases output by 50%, reduces energy consumption by 15% and lowers melt temperature by 10℃. It is highly suitable for manufacturing large-diameter and thick-wall pipes and effectively solves the melt sagging problem of large-diameter pipes.

In operation, raw materials are fed into the screw from the hopper. The rotating screw plasticizes raw materials into uniform melt through shearing and extrusion inside the barrel. The multi-section electric heating system precisely controls the temperature at 180-220℃ to ensure full melting without material degradation. The cooling system regulates the temperature of the screw and barrel in real time to avoid local overheating. The drive unit adopts a variable-frequency motor with reducer; high-end models are equipped with permanent magnet synchronous servo motors, providing stable torque of 200-600kW and precise speed regulation to maintain stable extrusion volume unaffected by backpressure fluctuation.

The optimized screw structure enables 90% of energy consumption for plasticization and 10% for material conveying, with specific energy consumption controlled at 0.19-0.21 kWh/kg, balancing high efficiency and energy saving.

1.3 Mold System (Key to Pipe Forming)

The mold system determines the outline and dimensional accuracy of HDPE pipes. It shapes the melt extruded from the extruder into standard tubular structures, mainly including head, flow channel and sizing section. The mainstream types are basket-type die head and spiral die head.

The diverter inside the die head divides the melt into an annular thin flow for even material distribution. The spiral flow channel guides the melt to flow spirally, eliminating weld lines and improving the integrity and strength of pipes. The annular gap formed by core mold and die lip directly determines the inner diameter and wall thickness; adjusting the gap can produce pipes of different specifications.

The mold is made of 40Cr mold steel, processed by quenching & tempering forging and hard chrome plating, featuring wear resistance, deformation resistance and high precision. High-end molds adopt CAE simulation for melt flow optimization to ensure uniform wall thickness. The maximum diameter of single-layer molds reaches 2700mm, and multi-layer composite molds up to 1600mm, supporting production of single-layer and multi-layer composite pipes.

1.4 Cooling and Sizing System

This system rapidly cools and solidifies the high-temperature molten pipe extruded from the mold to ensure dimensional accuracy and regular shape. It consists of vacuum sizing tank and spray cooling water tank.

The vacuum sizing tank adopts a negative pressure of 0.03-0.08MPa to closely attach the pipe to the sizing sleeve, precisely controlling outer diameter and roundness. The automatic closed-loop negative pressure control system shortens the cooling water tank length with energy saving efficiency over 50%. The multi-section spray cooling tank achieves rapid and uniform cooling to prevent deformation and cracking caused by uneven temperature. The tank length is generally 6-12 meters, equipped with a heat exchange system for precise water temperature control.

For pipes with outer diameter over 800mm and wall thickness over 80mm, a patented melt cooling device can be installed between the extruder and mold, lowering melt temperature by 10-15℃, reducing melt sagging and improving wall thickness uniformity.

1.5 Traction and Cutting System

The traction system pulls the cooled and sized pipe to the cutting section at a constant speed. It adopts a one-drive-multi synchronous control mode with multiple permanent magnet synchronous servo motors driven by a single controller, featuring stable low-frequency torque and wide speed range. The crawler tractor uses a self-tension profiling device to ensure close fitting between chain and guide rail, keeping traction speed precisely synchronized with extrusion speed and avoiding pipe stretching and deformation. The maximum traction speed reaches 70m/min for small-diameter pipes.

The cutting system adopts a fully automatic chipless cutting machine, applicable to pipe diameters from 20mm to 3300mm and maximum cutting wall thickness up to 200mm. The cut pipe end is smooth and flat with no noise or dust pollution, minimizing material waste. It supports one-click automatic diameter change for fast switching between different pipe specifications, reducing downtime and labor costs. The cutting length is precisely set by PLC control with a tolerance within ±1mm, meeting standardized mass production requirements.

1.6 Control System & Auxiliary System

The control system is equipped with Siemens PLC and human-machine touch screen. All process parameters (temperature, screw speed, traction speed, vacuum degree, cutting length) are displayed and adjusted in real time with simple operation.

High-end production lines support real-time data monitoring and remote network diagnosis, reducing quality defects by 30% and downtime by 50% through real-time fault SMS alerts. Cloud-based diagnosis solves 60% of equipment faults without on-site engineer support. The intelligent preheating function increases startup efficiency by 30%, raises annual output by 5-8%, cuts preheating energy consumption by 20% and reduces material waste by 15%.

Auxiliary equipment includes online printing machine, automatic coiler and finished product rack:

· The online printer marks pipe specifications, production date and manufacturer for product traceability.

· The automatic coiler is designed for small-diameter pipes, with automatic PP/PET strapping, packaging and unloading functions, adopting full servo control and laser ranging closed-loop tension control for neat pipe winding.

· The finished product rack stores cut pipes to avoid collision and deformation.

2. Working Process of Production Line

The whole process is continuous, highly automated and requires minimal manual intervention:

2.1 Raw Material Preparation: Mix HDPE pellets, color masterbatch and functional additives in proportion in the high-speed mixer.

2.2 Conveying & Drying: Vacuum loader transports blended raw materials to the dryer to remove moisture.

2.3 Plasticization & Extrusion: Dry raw materials enter the extruder, plasticized into uniform melt by screw shearing, heating and extrusion, then continuously conveyed to the mold.

2.4 Forming & Sizing: The melt forms a tubular shape through the mold annular gap, then enters the vacuum sizing tank to fit the sizing sleeve under vacuum for precise outer diameter and roundness control.

2.5 Cooling & Solidification: The sized pipe enters the spray cooling tank for staged rapid cooling and solidification.

2.6 Traction & Cutting: The tractor pulls the solidified pipe at a constant speed; the automatic chipless cutter performs fixed-length cutting.

2.7 Finishing & Storage: The online printer marks product information. Small-diameter pipes are coiled and packaged; large-diameter pipes are placed on finished racks and delivered after quality inspection.

3. Core Technical Advantages

3.1 High Efficiency & Energy Saving: Optimized 40:1 screw, permanent magnet servo drive and energy-saving design reduce overall energy consumption by 15-30% and increase output by over 50%, lowering production costs significantly.

3.2 Stable Product Quality: Precise control of temperature, pressure and speed, together with high-quality mold and sizing system, ensures outer diameter deviation within ±0.2mm, uniform wall thickness, no bubbles, weld lines or cracks. The qualified product rate reaches 99.97%. Manufactured pipes feature excellent flexibility, corrosion resistance and impact resistance, complying with national and industrial standards.

3.3 High Automation: Full-process PLC intelligent control realizes 24-hour continuous unmanned production, cutting labor costs and human operation errors. Remote diagnosis and automatic diameter change further improve production efficiency.

3.4 Wide Compatibility: By replacing molds and adjusting process parameters, the line produces full-specification pipes from 16mm to 3300mm, including single-layer, multi-layer composite and reinforced pipes, covering municipal, gas, industrial and agricultural applications.

3.4Eco-Friendly: The production process is dust-free and low-noise. HDPE raw materials are non-toxic and recyclable. Chipless cutting and energy-saving design reduce resource waste and carbon emissions.

3.5 Long Service Life: Key equipment parts adopt wear-resistant and anti-corrosion materials with precise manufacturing, featuring long service life and low maintenance cost. Under rated temperature and pressure, HDPE pipes have a safe service life of over 50 years.

4. Application Fields

4.1 Municipal Water Supply & Drainage: Urban water main pipes, buried drainage pipes, rainwater and sewage diversion pipes, and pipes in comprehensive utility tunnels. With corrosion resistance and anti-bacterial properties, they avoid secondary water pollution and adapt to complex underground geological conditions with excellent seismic performance.

4.2 Gas Transportation: Medium and low-pressure natural gas and coal gas buried pipelines.With excellent sealing and impact resistance, hot melt and electrofusion connection achieve zero leakage for safe gas conveyance.

4.3 Industrial Field: Corrosive medium transportation pipes for chemical, papermaking, pharmaceutical and food industries; mortar transportation pipes for mines and leachate collection pipes for landfill sites. HDPE material is acid and alkali resistant with no additional anti-corrosion treatment required.

4.4Agricultural Field: Farmland water-saving irrigation, sprinkler and drip irrigation pipes. Lightweight and flexible for easy laying, with anti-aging and UV-resistant properties suitable for outdoor farmland environments.

4.5 Other Fields: Power and telecommunication cable protection pipes, building water supply and drainage pipes, and trenchless construction pipes such as MPP power pipes for directional drilling, reducing road excavation by 60%.\

5. Development Trend

Driven by urbanization, upgraded environmental standards and growing engineering demand, HDPE pipe production lines are developing toward intellectualization, large-scale production, energy conservation and green manufacturing:

· Integrate IoT and big data to realize full-process intelligent monitoring, data analysis and automatic process parameter optimization.

· Break technical bottlenecks for ultra-large-diameter pipes above 3300mm to meet demands of large municipal and industrial projects.

· Upgrade energy-saving technologies and introduce pipe recycling production to reduce energy consumption and carbon emissions.

· Strengthen scenario-based overall solution capabilities, combining BIM and trenchless construction technology to provide full-cycle services from design and production to operation and maintenance.