Overview
Ultra-High Molecular Weight Polyethylene (UHMWPE) fiber is a high-performance polyethylene fiber with a molecular weight typically between 1 and 6 million g/mol.
The polymer chains form a highly oriented linear structure, enabling extremely high tensile strength and modulus.
UHMWPE fiber is considered one of the three major high-performance fibers, together with Carbon Fiber and Aramid Fiber.
Key material characteristics include:
- Very high strength-to-weight ratio
- High impact resistance
- Excellent chemical resistance
- Low dielectric constant
- High electromagnetic wave transparency
- Low friction coefficient
- UV and corrosion resistance
These properties make UHMWPE fiber suitable for demanding applications where high strength and low weight are required.
Applications
- UHMWPE fibers are widely used in:
- Soft body armor
- Anti-stab protective clothing
- Lightweight ballistic helmets
- Radar domes
- Armored vehicles and helicopter protection
- Marine ropes and offshore mooring systems
- High-pressure lightweight vessels
- Aerospace structural components
- Deep-sea aquaculture nets
- Fishing nets and marine cables
- High-performance sporting equipment
Process solution-Production Process
Industrial production of UHMWPE fiber mainly uses the gel spinning and hot drawing process. In this process, UHMWPE powder is dissolved in a solvent such as decalin, mineral oil, or paraffin oil with stabilizing additives. The polymer solution is extruded through a spinneret to form gel filaments, followed by solvent extraction and multi-stage hot drawing to achieve high molecular orientation.
The drawing stage significantly increases molecular orientation and crystallinity, converting folded chain crystals into extended chain structures, which results in very high fiber strength and modulus.
Commercial UHMWPE fibers such as Dyneema and Spectra Fiber are produced using this gel spinning technology.
Wet Spinning Process Flow
Resin → White Oil → Feed Vessel → Dissolution → Expansion Vessel → Screw Extrusion → Spinneret → Cooling Bath → Extraction → Drawing Roller → Winding → Spool → Hot Stretching → Fiber
Extrusion options
| Model | L/D | Motor Power | Throughput |
| AK125 | 68 | 132 kW | 450 kg/h |
Twin-screw extrusion systems are used for polymer dissolution, homogenization, and stable gel extrusion prior to the spinning stage.
Customer Cases
| Customer | Application | Equipment | Quantity |
| Jiangsu Technology Company | UHMWPE Fiber Production | AK125 | 50 |
| Beijing Fiber Technology Development Company | UHMWPE Fiber Production | AK125 / AK96 | 7 / 5 |
| Jiangsu New Materials Company | UHMWPE Fiber Production | AK96 | 4 |
| Technology Corporation | UHMWPE Fiber Production | AK125 | 2 |
| Yancheng New Materials Company | UHMWPE Fiber Production | AK125 | 3 |
| Shanghai Chemical Company | UHMWPE Materials | AK125 / HK73 | 1 / 1 |
Twin-screw extrusion solutions for UHMWPE fiber production. Learn about gel spinning processes, extrusion systems, and equipment used in high-performance polyethylene fiber manufacturing.
