Overview
PU rollers are polyurethane-coated rollers widely used in conveyor systems, material handling equipment, and industrial machinery for transporting, guiding, and processing products and materials. Manufactured by bonding high-performance polyurethane elastomer to metal or plastic core substrates, these rollers combine the resilience and grip of polyurethane with the structural strength of a rigid core. OrroMFG produces precision PU rollers in a comprehensive range of sizes, durometers, and polyurethane formulations to meet the diverse requirements of industrial conveyor and material handling applications.
Our PU roller product line includes drive rollers, idler rollers, nip rollers, pinch rollers, guide rollers, and custom-designed rollers for specialized applications. We offer both polyether-based and polyester-based polyurethane formulations, each optimized for specific performance requirements. Polyester PU provides excellent wear resistance and mechanical strength for heavy-load applications, while polyether PU offers superior hydrolysis resistance and low-temperature flexibility for wet or cold environments. PU rollers are valued for their excellent abrasion resistance, high friction coefficient, noise-damping properties, and ability to absorb shock and vibration. They provide gentle yet secure product handling, making them ideal for conveying fragile items, glass, and finished products where surface protection is important. All our PU rollers are precision ground to tight dimensional tolerances and surface finish requirements for consistent, reliable performance.
Key Features
- Exceptional Wear Resistance: Polyurethane provides 5-10 times the wear resistance of rubber, dramatically extending roller service life.
- High Traction and Grip: High coefficient of friction ensures positive drive and reliable product conveyance without slippage.
- Shock and Vibration Absorption: Excellent resilience absorbs impact and vibration, reducing noise and protecting conveyed products from damage.
- Wide Hardness Range: Available from 20 Shore A (soft) to 75 Shore D (hard) to match specific load and traction requirements.
- Chemical and Oil Resistance: Resistant to oils, greases, solvents, and many industrial chemicals depending on formulation.
- Non-Marking and Quiet: Non-marking polyurethane formulations protect product surfaces and operate quietly compared to metal rollers.
Material Specifications
| Property | Polyester PU (90A) | Polyester PU (95A) | Polyether PU (90A) | Food-Grade PU (85A) |
|---|---|---|---|---|
| Hardness (Shore A) | 90 ± 5 | 95 ± 5 | 90 ± 5 | 85 ± 5 |
| Tensile Strength (MPa) | 35 - 50 | 40 - 55 | 25 - 40 | 25 - 40 |
| Elongation at Break (%) | 400 - 600 | 350 - 500 | 450 - 650 | 400 - 600 |
| Tear Strength (kN/m) | 80 - 120 | 90 - 130 | 60 - 100 | 50 - 90 |
| Compression Set (%) | ≤ 20 | ≤ 25 | ≤ 25 | ≤ 20 |
| Abrasion Resistance (DIN 53516, mm³) | ≤ 30 | ≤ 25 | ≤ 40 | ≤ 40 |
| Rebound Resilience (%) | 30 - 50 | 25 - 45 | 35 - 55 | 35 - 55 |
| Continuous Service Temp (°C) | -20 to +80 | -20 to +80 | -40 to +70 | -20 to +70 |
| Density (g/cm³) | 1.10 - 1.20 | 1.10 - 1.25 | 1.05 - 1.15 | 1.05 - 1.15 |
| Hydrolysis Resistance | Fair | Fair | Excellent | Good |
| Oil Resistance | Excellent | Excellent | Good | Good |
| FDA Compliance | - | - | - | Yes |
Applications
Conveyor Systems
PU rollers are extensively used as drive rollers, snub rollers, take-up rollers, and idler rollers in belt conveyor systems across all industries. Their high traction ensures efficient power transmission to the belt, while their excellent wear resistance provides long service life even in high-cycle continuous operation. PU-covered rollers also reduce belt wear compared to steel rollers, lowering overall conveyor maintenance costs.
Packaging and Labeling Lines
In packaging machinery and labeling lines, PU nip rollers and pinch rollers feed and advance packaging materials, labels, and products through the production process. Their consistent grip and resilience ensure precise material feeding without slippage or damage to delicate packaging materials. PU rollers are also used in case sealers, shrink wrappers, and pallet wrapping machines.
Food and Beverage Processing
Food-grade PU rollers meeting FDA requirements are used in food and beverage processing conveyors, bottling lines, canning lines, and packaging equipment. They provide hygienic, non-marking product handling and resist cleaning chemicals and high-pressure washdowns. PU rollers are particularly valuable for conveying glass bottles, cans, and food containers where product protection and gentle handling are essential.
Printing, Paper, and Film Processing
In printing presses, paper converting equipment, and film processing lines, PU rollers serve as feed rollers, pressure rollers, and guide rollers for paper, plastic film, foil, and other web materials. Their consistent diameter and surface finish ensure uniform tension and precise material handling. PU rollers’ excellent wear resistance and non-marking properties contribute to high-quality print and converting results.
Material Handling and Logistics
In warehouse automation, distribution centers, and parcel sorting systems, PU rollers provide reliable, low-noise operation for roller conveyors, sortation systems, and accumulation conveyors. Their shock-absorbing properties reduce noise levels in busy logistics facilities, while their high wear resistance withstands the heavy use of 24/7 distribution operations.
Operating Conditions
- Temperature Range: -40°C to +80°C (-40°F to +176°F) depending on formulation; special high-temperature grades available up to 120°C
- Load Capacity: Up to 500 kg per roller depending on diameter, core material, PU hardness, and bearing selection
- Speed Range: Up to 5 m/s (1000 ft/min) surface speed depending on roller design and bearing type
- Chemical Compatibility: Resistant to oils, greases, fuels, hydraulic fluids, dilute acids and bases, and many solvents; polyether grades offer better water/hydrolysis resistance
- Not Recommended For: Strong acids, ketones, esters, chlorinated solvents, and prolonged high-temperature exposure above rating
- Surface Options: Smooth, matte, grooved, knurled, and custom surface patterns for specific traction requirements
- Core Materials: Steel, stainless steel, aluminum, and plastic cores available depending on load and corrosion requirements
Material Comparison
| Material | Wear Resistance | Traction/Grip | Noise Level | Temperature Range | Cost | Best For |
|---|---|---|---|---|---|---|
| Polyurethane (PU) | Excellent | Excellent | Low | -40 to +80°C | Medium-High | Conveyors, heavy-load, high-traction apps |
| Rubber (EPDM/NBR) | Good | Good | Very Low | -50 to +120°C | Low | General purpose, light-load, low-cost apps |
| Steel | Fair | Poor | High | -40 to +200°C+ | Low-Medium | Heavy-load, high-temp, lubricated apps |
| Nylon | Good | Fair | Medium | -40 to +120°C | Low-Medium | Light-duty, low-friction, return rollers |
| UHMWPE | Excellent | Poor | Low | -200 to +80°C | Medium | Low-friction, return/idler, food apps |
| Silicone | Fair | Good | Very Low | -60 to +230°C | High | High-temp, food/pharma, low-wear apps |
Choose PU rollers when:
- High traction and non-slip drive performance are required
- Excellent wear resistance for long service life is needed
- Shock absorption and noise reduction are important
- Non-marking, gentle product handling is essential
- The application involves conveyor systems, packaging, or material handling
- Oil and grease resistance is required
Customization Options
- PU Formulations: Polyester PU, polyether PU, food-grade PU (FDA 21 CFR 175.300), high-temperature PU, flame-retardant PU, anti-static PU
- Hardness Range: 20 Shore A to 75 Shore D, with 80A, 85A, 90A, 95A as most common
- Roller Types: Drive rollers, idler rollers, nip/pinch rollers, guide rollers, crown rollers, grooved rollers, V-rollers, custom profiles
- Size Range: Roller diameter 20mm to 500mm; length 50mm to 3000mm; custom sizes available
- Core Materials: Steel (galvanized, black oxide, painted), stainless steel (304, 316), aluminum, plastic (PVC, nylon)
- Crown Profiles: Flat, single-crown, double-crown, and custom profiles for belt tracking
- Surface Patterns: Smooth, matte, diamond-knurled, grooved, herringbone, and custom traction patterns
- Bearing Options: Ball bearings, roller bearings, sleeve bearings, flanged bearings, pressed-in bearings
- Tolerance Grades: Diameter tolerance ±0.05mm; surface roughness Ra 0.8-3.2 μm; runout ≤ 0.1mm TIR
- Color Options: Natural (amber/beige), black, blue, red, yellow, green, and custom colors for identification
- Secondary Operations: Precision grinding, dynamic balancing, keyway cutting, and assembly services
Quality Assurance
OrroMFG maintains strict quality control throughout PU roller manufacturing. Our ISO 9001:2015 certified quality management system ensures consistent product quality from raw material receipt through final inspection and shipment. We source polyurethane raw materials from leading global chemical manufacturers and verify prepolymer properties including isocyanate content, viscosity, and reactivity upon receipt.
Manufacturing processes including core preparation, primer application, casting/pouring, curing, and grinding are carefully controlled with documented process parameters and cycle monitoring. Quality control inspections include dimensional verification of diameter, length, and concentricity using coordinate measuring machines (CMM) and specialized gauging. We measure hardness using Shore durometers per ASTM D2240, test tensile strength and elongation per ASTM D412, and evaluate tear strength per ASTM D624. Abrasion resistance is tested per DIN 53516 or ASTM G65 for wear performance validation. Surface roughness is measured using profilometers to verify finish specifications. For precision rollers, we perform dynamic balancing and runout verification. Food-grade PU rollers come with FDA compliance declarations and supporting documentation. All PU rollers are supplied with material certificates, inspection reports, and full batch traceability documentation. Our commitment to quality ensures that every PU roller delivers reliable, consistent performance and extended service life in the most demanding conveyor and material handling applications.
