PU/UHMWPE Liners
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Polyurethane (PU) & UHMWPE Liners: Advanced Impact & Wear Protection Solutions
Polyurethane (PU) and Ultra High Molecular Weight Polyethylene (UHMWPE) liners are specialized materials designed to protect equipment and structural surfaces in high-impact, high-abrasion, and noisy operational zones. Known for their excellent wear resistance, noise dampening, and low friction properties, these liners are a preferred choice in mining, aggregate processing, cement, fertilizer, and bulk handling industries.
Key Applications:
- High-Impact Zones:
- Transfer Points & Loading Areas: PU and UHMWPE liners are installed at belt transfer chutes and truck unloading zones to absorb heavy impact, protecting the steel substrate.
- Vibrating Screens & Feeders: Reduce wear from vibration and material flow, while minimizing operational noise.
- Screen Media Support Liners: Offer cushioning for screen panels and extend screen life.
- Material Flow Optimization:
- Chutes, Silos, and Hoppers: UHMWPE’s ultra-low coefficient of friction ensures smooth material flow and prevents sticking or clogging.
- Screw Conveyors & Slide Beds: Reduces drag, power consumption, and wear on mechanical components.
- Anti-Caking & Corrosion Resistance:
- Fertilizer Plants & Chemical Units: UHMWPE resists chemical corrosion and material build-up, making it ideal for corrosive and sticky materials.
- Cement Plants: Used in raw material bins and clinker conveyors where abrasion and material hang-up are common.
| Property | Polyurethane (PU) | UHMWPE |
|---|---|---|
| Impact Resistance | ★★★★★ | ★★★★☆ |
| Wear Resistance | ★★★★☆ | ★★★★★ |
| Noise Dampening | ★★★★★ | ★★★★☆ |
| Friction (Flowability) | ★★★☆☆ | ★★★★★ (Extremely low coefficient) |
| Chemical Resistance | ★★★☆☆ | ★★★★★ |
| Temperature Tolerance | Moderate (up to ~80–100°C) | Higher (up to ~130°C intermittent) |
Manufacturing & Installation Process:
For Polyurethane (PU) Liners:
- Raw Material Blending: A mixture of polyols and isocyanates is prepared with catalysts and pigments.
- Molding or Casting: The mixture is poured into custom molds or cast onto metal backings.
- Curing: The liners are cured under controlled temperatures to achieve desired hardness and elasticity.
- Finishing: Surface trimming and machining as per dimensional tolerances.
For UHMWPE Liners:
- Extrusion or Compression Molding: UHMWPE granules are melted and extruded into sheets or pressed in molds under high pressure.
- Cooling & Trimming: Sheets are cooled and cut to required sizes and thicknesses.
- Surface Machining: If needed, liners are drilled, chamfered, or grooved for mounting.
- Installation: Liners are fixed using countersunk bolts, studs, or welding (for special grades), often backed with anti-vibration rubber padding.
Benefits of PU & UHMWPE Liners:
- Superior Impact Resistance – Prevents structural damage from falling or fast-moving bulk material.
- Low Friction Surface – Ensures smooth material flow, reduces clogging and build-up.
- Noise Reduction – Absorbs sound and vibration, creating a safer and quieter workspace.
- Corrosion & Chemical Resistance – Ideal for aggressive chemical environments.
- Lightweight & Easy to Install – Especially UHMWPE, which is lighter than steel.
- Custom Shapes & Sizes – Can be molded, cut, and machined to fit any surface.
Polyurethane and UHMWPE liners represent cutting-edge solutions for operational challenges in heavy industries. Whether the goal is impact absorption, wear protection, or noise control, these liners offer a long-lasting and cost-efficient alternative to steel, ceramic, or rubber linings. Their versatility, ease of installation, and performance in demanding conditions make them indispensable in modern material handling and processing systems.
