Overview
PU guide wheels are rolling components in which a high-performance polyurethane (PU) elastomer is bonded to a metal or engineering plastic hub, producing a wheel that guides, aligns, tensions, or drives belts, webs, chains, and products in machinery. The polyurethane tire provides high grip, excellent abrasion resistance, and shock absorption, while the rigid hub delivers structural strength and accurate mounting. OrroMFG produces PU guide wheels in a wide range of diameters, widths, and durometers, machined and ground to tight tolerances for smooth, consistent rotation in demanding industrial equipment.
Polyurethane is valued for combining the resilience of rubber with the toughness and load capacity of engineering plastics. Compared with rubber wheels, PU guide wheels offer significantly higher abrasion resistance, greater load capacity, and better resistance to oils and many chemicals, while remaining non-marking and quiet in operation. The hardness of the PU can be tailored from soft, high-grip compounds to hard, low-rolling-resistance compounds, allowing the same wheel design to be optimized for traction, wear life, or precise guidance. OrroMFG offers both polyester-based PU for excellent wear resistance and mechanical strength and polyether-based PU for superior hydrolysis resistance in wet or humid environments. Wheels can be supplied with crowned, flat, or profiled running surfaces and with bearing bores, integrated shafts, or keyed hubs.
Key Features
- High Traction and Grip: The high coefficient of friction of polyurethane ensures positive drive and reliable guidance without slippage on belts, webs, and chains.
- Exceptional Abrasion Resistance: PU delivers several times the wear resistance of rubber, extending wheel service life and reducing replacement frequency.
- Shock and Vibration Absorption: Elastic polyurethane cushions impact and vibration, protecting products and machine components and reducing operating noise.
- Wide Hardness Range: Available from soft, high-grip compounds to hard, low-rolling-resistance compounds to suit specific traction and load requirements.
- Non-Marking and Quiet: Non-marking PU formulations protect delicate product surfaces and run quietly compared with metal or hard plastic wheels.
- Oil and Chemical Resistance: Resistant to oils, greases, and many industrial chemicals, maintaining grip and dimensional integrity in contaminated environments.
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 |
Applications
Material Handling
PU guide wheels are used in conveyors, transfer units, and guided cart systems to steer, align, and drive loads with high grip and low noise. Their abrasion resistance withstands continuous contact with belts, rails, and chains, while their shock absorption protects products and reduces vibration. Because they are non-marking, they are suitable for handling finished goods, glass, and delicate items where surface protection matters.
Industrial Automation
In automated machinery, PU guide wheels serve as guide, tension, and pinch wheels that keep belts and webs tracking accurately through high-speed processes. Their high friction provides reliable traction without slipping, and their resilience damps vibration that could affect positioning accuracy. OrroMFG machines wheels to precise diameters and profiles so that multiple wheels run in alignment for consistent product guidance.
Packaging Industry
PU guide wheels guide film, foil, labels, and cartons through form-fill-seal machines, wrappers, and labelers. Their grip maintains consistent web tension, while their non-marking surface protects printed packaging and clear film from scuffing. Their quiet running and wear resistance support reliable, high-throughput packaging with minimal maintenance.
Woodworking Machinery
PU guide wheels are used in feed systems, edge banders, and panel handling equipment to drive and guide boards with firm, even traction. Their abrasion resistance tolerates the dust and constant contact typical of woodworking lines, and their resilience absorbs shock from irregular workpieces. Their non-marking behavior helps protect finished panel surfaces during transport.
Printing and Converting
In printing and converting equipment, PU guide wheels guide and tension paper, film, and web material through press, coating, and slitting stations. High grip maintains accurate web control, while shock absorption and quiet operation reduce vibration and noise at high speeds. Oil- and chemical-resistant formulations suit environments exposed to inks and solvents.
Operating Conditions
- Temperature Range: -40°C to +80°C (-40°F to +176°F) depending on formulation; polyether PU offers the best low-temperature flexibility
- Load Capacity: Suitable for light-to-medium loads; higher-durometer grades carry greater load with lower rolling resistance
- Speed Rating: Well suited to moderate surface speeds typical of conveyor, packaging, and web-handling equipment; consult OrroMFG for high-speed duty
- Traction Requirements: High-grip soft compounds maximize traction; harder compounds minimize rolling resistance for idler and guide duty
- Chemical Compatibility: Excellent resistance to oils and greases; polyester PU performs well with hydrocarbons, while polyether PU is preferred for wet and humid service
- Hydrolysis and Moisture: Polyether PU is recommended for washdown, humid, and wet environments; polyester PU suits dry, oil-exposed duty
- Lubrication: Normally run dry; bearings or bushings may be lubricated separately as required by the application
- Environment: Non-marking and quiet; food-grade formulations available for food-adjacent and clean environments
Material Comparison
| Material | Traction | Temp Range | Wear Resistance | Cost | Best For |
|---|---|---|---|---|---|
| Polyurethane (PU) | Excellent | -40 to +80°C | Excellent | Medium | High-grip guide, drive, and tension wheels |
| Rubber | Very Good | -40 to +100°C | Fair | Low-Medium | General grip and vibration damping |
| Nylon (PA6/PA66) | Fair | -40 to +120°C | Good | Low-Medium | Low-friction, load-bearing guide rollers |
| POM (Acetal) | Fair | -40 to +100°C | Very Good | Medium | Low-friction, dimensionally stable guide rollers |
| Steel (Coated) | Moderate | -40 to +250°C | Good | Low | Heavy-load, high-temperature, high-rigidity duty |
Choose PU guide wheels when:
- High traction and positive grip are required for guiding, tensioning, or driving
- Abrasion resistance and long wear life are important for continuous contact duty
- Shock absorption and quiet operation are needed to protect products and reduce noise
- Non-marking, product-safe contact surfaces are essential
- Resistance to oils, greases, and many industrial chemicals is required
- A softer, higher-grip alternative to nylon, POM, or metal wheels is preferred
Customization Options
- Material Grades: Polyester PU, polyether PU, food-grade PU, oil-resistant PU, and anti-static PU formulations
- Hardness Range: From 20 Shore A (soft, high-grip) to 75 Shore D (hard, low-rolling-resistance) to match application needs
- Size Range: Outside diameters from 15 mm to 500 mm; widths from 5 mm to 150 mm; custom dimensions available
- Tolerances: Machined and ground to IT7-IT9 for diameters and bores; concentricity and runout controlled to customer requirements
- Wheel Profiles: Flat, crowned, grooved, flanged, and contoured running surfaces; matched profiles for specific guides and rails
- Hub and Bore Options: Metal or plastic hubs, through bores, blind bores, bearing and bushing seats, integrated shafts, and keyed hubs
- Surface Finishes: Ground and polished running surfaces for smooth, consistent contact and reduced wear
- Color Options: Natural amber, black, white, and custom colors for identification or food-zone coding
- Bonding Options: Chemically bonded or mechanically keyed PU-to-hub construction for maximum shear strength
- Secondary Operations: Assembly with bearings, shafts, and axles; dynamic balancing and clean packaging on request
Quality Assurance
OrroMFG manufactures PU guide wheels within an ISO 9001:2015 certified quality management system, applying documented controls that ensure consistent material quality and precise geometry. Incoming polyurethane and hub materials are verified against supplier certificates, with hardness and cure checks performed to confirm the specified durometer and formulation. Process control plans define casting, bonding, machining, and grinding parameters so that critical characteristics such as hardness, diameter, crown profile, and bond integrity are monitored throughout production.
In-process inspection verifies durometer, dimensions, and bond quality using calibrated gauges and hardness testers, while final inspection includes 100% verification of critical features and sampling of surface finish and visual quality. Coordinate measuring machine (CMM) reports are available for precision programs, and bond shear testing is performed on critical wheels. Finished wheels are supplied with material certificates, inspection reports, and batch traceability documentation, and first article inspection (FAI) reports are provided for new or high-value programs on request. This disciplined quality process ensures that every PU guide wheel delivers reliable grip, wear resistance, and quiet operation in continuous industrial service.
