China Polyethylene Extrusion Manufacturers & Precision Tube Solutions

Pioneering High-Performance Extrusion Systems, Advanced Automated Processing, and Custom Polymer Engineering for Global Industrial Applications.

Advanced Engineering

Understanding Polyethylene Extrusion Mechanics

Polyethylene (PE) extrusion represents the backbone of modern industrial polymer processing. Ranging from Low-Density Polyethylene (LDPE) to High-Density Polyethylene (HDPE), Linear Low-Density Polyethylene (LLDPE), and Ultra-High-Molecular-Weight Polyethylene (UHMWPE), each variant poses unique thermodynamic and rheological challenges.

To achieve dimensional stability, high-speed throughput, and molecular orientation in the final profile or tube, a precise co-relation between screw design, barrel heating zones, head pressure control, and sizing sleeve temperature is required. This technical balance prevents issues like melt fracture, internal stresses, and diameter variations.

  • Highly precise single screw L/D ratios optimized for specific resin melt flow rates (MFR).
  • Vacuum calibration and water cooling systems designed for rapid heat dissipation.
  • Precise haul-off units synchronized with the screw output to eliminate longitudinal shrinkage.
Precision Extrusion Line Machinery Showcase

Rheological Insight: Processing HDPE vs. LDPE

HDPE exhibits a highly linear molecular structure with minimal branching, providing high tensile strength and rigidity, but demanding narrow process windows due to high melt viscosity and crystalline shrinkage. Conversely, LDPE's highly branched structure yields high melt strength and flexibility, allowing for wider processing windows. Designing a versatile system requires customizable screw configurations and advanced gravimetric control to ensure wall-thickness consistency regardless of the material's shear-thinning characteristics.

25+

Years of Extrusion R&D Experience

16,000 m²

State-Of-The-Art Manufacturing Base

100+

Expert Technicians & Engineers

High Speed Single Wall Corrugated Hose Line

Company History

Jiangsu Baodie Automation Equipment Co., Ltd. (BAOD EXTRUSION)

Established in 2002, BAOD EXTRUSION is a leading pioneer in designing, fabricating, and supplying high-precision plastic extrusion systems. Leveraging 18 years of prior research, development, and engineering expertise originating from Taiwan, our parent company (KINGSWEL GROUP) initially established our Shanghai production hub in 1999 to support the growing demand for precision tubing.

Today, from our expanded 16,000 square meter facility in Jiangsu, we focus on producing automated, energy-efficient, and highly secure extrusion configurations. Our machinery enables industrial users to manufacture medical-grade catheters, automotive fuel/corrugated lines, telecommunication microducts, and complex multi-layered composite hoses.

Why Source From China?

Key Advantages of Chinese Extrusion Manufacturers

From robust domestic raw material supply chains to advanced custom electrical integration, Chinese manufacturers offer unique benefits.

Fully Integrated Supply Chains

By operating near primary steel, precision motor, and CNC fabrication markets, manufacturers like BAOD achieve highly optimized lead times, rapid prototyping cycles, and cost-effective assembly.

Advanced Customization Capabilities

We configure extrusion lines to align with specific factory layouts, voltage requirements, and material properties, offering customizable L/D ratios and modular downstream tooling.

International Compliance & Testing

BAOD lines are engineered to meet global quality standards, incorporating CE-certified electrical systems, Siemens PLCs, and reliable safety locks for international deployments.

Industrial Application Scenarios

Polyethylene Extrusion Solutions for Diverse Verticals

From micro-tubing to heavy infrastructure profiles, our systems are optimized for specific industrial applications.

01. Telecommunications & Fiber Optics

HDPE Silicone-Core Microducts: Used for protecting underground fiber optic cables, these ducts feature a co-extruded inner layer of silicone lubricant to minimize friction. BAOD's specialized co-extrusion technology maintains precise internal dimensions, allowing for long-distance cable installation without binding.

02. Automotive Fuel & Fluid Transport

Multi-layer PA/PE Composite Tubes: Delivering chemical resistance, low fuel permeability, and flexibility. Our multi-layer co-extrusion crossheads allow manufacturers to apply accurate tie-layers and barrier layers at high production speeds.

03. Medical Catheter & Fluid Lines

Precision Small-Diameter Tubing: Produced with tight dimensional tolerances under cleanroom-ready conditions. These systems feature closed-loop OD/ID sizing control and high-performance vacuum calibration tanks to prevent ovality.

04. Municipal & Agricultural Piping

Single & Multi-layer Water Lines: Designed to process PE80 and PE100 materials, our robust lines generate structural municipal pipe capable of handling high pressure. Heavy-duty vacuum tanks and spray cooling systems ensure even crystallization across thick pipe walls.

05. Structural Profiles & Industrial Sheathing

Steel Strand & Metal Corrugated Coating: Extruding a protective PE layer directly onto structural cables, corrugated pipes, and compensation chains. This process provides lasting corrosion resistance and mechanical protection in marine, bridge, and industrial projects.

Future Trends & Sourcing Guidance

Technological Trends & Global Sourcing Frameworks

How global companies navigate technological advancements, energy efficiency, and strict quality control standards.

Emerging Technology Trends (2026 and Beyond)

AI-driven Closed-loop Calibration: Automated feedback loops now connect laser outer-diameter (OD) gauges directly to the extruder speed and vacuum sizing pressure. If deviations occur, the system self-adjusts in real-time, reducing startup waste and manual monitoring.

Processing Post-Consumer Recycled (PCR) Resins: As global sustainability mandates tighten, extrusion lines must adapt to the variable melt indices of recycled PE. Custom screw profiles and enhanced melt filtration units allow operators to use high percentages of PCR without compromising structural integrity.

High-Speed Automation: Modern lines prioritize reduced labor touchpoints. Integrated systems—from gravimetric dosing to dynamic coiling units—enable continuous production run-times with minimal operator intervention.

Global Procurement Framework for Tech Buyers

When sourcing PE extrusion equipment from China, overseas procurement departments should assess the following criteria during their evaluation:

  • Extrusion Stability: Look for screw L/D ratios of 30:1 or 33:1 paired with bimetallic barrels to ensure long-term wear resistance.
  • Downstream Syncing: Verify that the haul-off puller and rotary cutter are fully integrated through a centralized PLC, avoiding line tension variations.
  • Local After-Sales: Ensure the manufacturer provides secure remote diagnostic connections, allowing developers in China to troubleshoot PLC parameters quickly.
Technical FAQ

Frequently Asked Questions: Polyethylene Extrusion

Expert technical insights regarding machine configurations, raw materials, and processing optimization.

What is the optimal screw L/D ratio for PE extrusion?
For typical HDPE or LDPE applications, a single screw extruder utilizes a Length-to-Diameter (L/D) ratio between 30:1 and 33:1. This range provides a consistent melting profile, adequate shear heating, and stable pressure control. High-output lines processing masterbatches or filler materials may require up to 36:1 to achieve uniform dispersion.
How do you prevent melt fracture (sharkskin) during high-speed PE extrusion?
Melt fracture occurs when the shear stress at the die exit exceeds the polymer's critical limit. We minimize this by optimizing the die land length, applying specialized coatings to the die channel, managing zone temperatures at the die head, or adding processing aids (PPA) to the raw material.
Why is a vacuum calibration tank essential for small-diameter tubing?
Precision small-diameter tubing, such as medical-grade catheters or telecommunication microducts, requires strict dimensional tolerances. The vacuum calibration tank maintains a controlled environment that sizes the hot polymer tube against a calibration sleeve using outer vacuum suction and internal pressure, fixing the outer diameter before structural cooling.
What is the benefit of a gravimetric dosing system over volumetric dosing?
Gravimetric dosing measures components by weight in real-time, automatically adjusting for variations in material density, pellet size, or bulk density. This system ensures consistent color and layer thickness, preventing raw material waste over long production runs.
Can BAOD extrusion lines process multi-material polymers (e.g. PE + PA)?
Yes, our multi-layer co-extrusion systems support up to 5-layer co-extrusion. By utilizing dedicated extruders feeding into a single, multi-flow distribution block, we combine PA, PE, EVOH, and tie-resins to produce high-barrier, flexible composite tubes.
How is wall thickness deviation controlled during continuous extrusion?
We integrate high-frequency ultrasonic wall-thickness measurement sensors downstream of the calibration tank. These sensors feed back data directly to the PLC system. The system automatically adjusts either the die head centering pins (on motorized designs) or the haul-off speed ratio to maintain a uniform wall profile.
Industry News & Technical Insights

Latest Updates From BAOD EXTRUSION

Stay informed with the latest developments in plastic extrusion machinery, industrial events, and engineering techniques.

CHINAPLAS Exhibition Success

CHINAPLAS Concludes Successfully, BAOD EXTRUSION Showcases High-Efficiency Innovation

From April 21–24, CHINAPLAS was successfully held at the National Exhibition and Convention Center in Shanghai. BAOD EXTRUSION presented its latest R&D achievements, highlighting "Smart Extrusion & High-Efficiency Innovation" solutions for modern polymer lines.

Apr/30/2026 Read More +
Custom Detonating Tube Extrusion Line

Innovation & Reliability: BAOD EXTRUSION Ranked Top 10 Detonating Tube Provider

In high-precision defense, mining, and demolition operations, small-diameter detonating tubes demand exceptional wall consistency. BAOD EXTRUSION provides specialized, stable machinery engineered to meet strict international compliance standards.

Mar/26/2026 Read More +
Multi-Lumen Tube Extrusion Line

High Precision Multi-Lumen Tube Extrusion Line In China vs European Standards

Comparing the mechanical capabilities of multi-lumen tubing production between European systems and leading Chinese manufacturers. Learn how BAOD achieves comparable accuracy and tolerance levels through optimized die geometries.

Mar/23/2026 Read More +