Our Custom Polyurethane Star Wheels are engineered via a high-performance thermoset cast process to withstand extreme impingement abrasion in coal mines and farming sectors. By optimizing stoichiometry, we deliver wheels with a 55 kN/m tear strength, offering 4x the lifespan of rubber or injection-molded TPU in high-impact, abrasive slurry environments.
Our polyurethane star and finger wheels serve diverse sectors including food processing, packaging machinery, agricultural sorting, and mining equipment. They are mainly used for sorting, grading, cleaning, and de-stoning root crops, waste screening, and composting.
Fully Customizable PU Star and Finger Wheels for Diverse OEM Equipment
We understand that one size does not fit all in global agricultural engineering. PEPSEN offers comprehensive OEM replacement PU wheels compatible with major harvesting brands. Whether you require a specific bore size (square, hexagonal, or keyed) or a unique outer diameter (OD), our custom polyurethane molding capabilities ensure a perfect fit for your existing shafts.
Food processing urethane star wheels, chemical-resistant industrial finger wheels
Core Material
Steel/iron/plastic core
High-load conveyor polyurethane star wheels, light-duty automation finger wheels
Surface Treatment
Smooth/anti-slip finish
Logistics transport urethane star wheels, high-speed screening finger wheels
Engineered Star Wheels for Coal Sorters and Harvesting Equipment
We specialize in OEM Star Wheel replacements for underground mining conveyors and combine harvesters. These wheels are formulated for maximum tensile strength and cut-and-chip resistance, ensuring they can handle sharp rock debris and heavy crop loads without premature tooth failure, structural deformation, or excessive heat buildup during peak cycles.
- Potato & Root Vegetable Harvesters: OEM replacement wheels for primary and secondary web separators.
- De-stoning Equipment: High-hardness PU wheels designed to withstand $30+ J/cm^2$ impact energy from stones.
- Waste & Recycling Sorters: Industrial-grade star wheels used in MRF (Material Recovery Facilities) for cardboard and plastic separation.
- Custom OEM Grading Lines: Precision-molded finger wheels for high-speed fruit and vegetable sizing.
-
Polyurethane vs. Steel and Rubber: Why Cast Urethane Wins in Heavy Industry
In heavy-duty material handling, choosing Cast Polyurethane over steel or rubber reduces TCO by minimizing downtime and preventing corrosion. Our PU star wheels offer the load-bearing capacity of metal with the impact resilience of rubber, effectively resisting hydrolysis and chemical attack from liquid fertilizers and acidic mine water.
Understanding Impingement Abrasion in Coal and Soil Handling
Field performance in mining is dictated by impingement abrasion and dynamic shear forces. Our Custom Star Wheels are formulated with a high molecular weight prepolymer that creates a resilient surface. This structure absorbs the kinetic energy of sharp coal debris and rocky soil, reducing surface pitting and extending component life compared to standard metallic rollers.
Case Studies: How Polyurethane Star Wheels Solved Client Challenges
Common failures like tooth shearing or surface pitting in agricultural star wheels are caused by low dynamic load capacity. Our Custom Star Wheels address these root causes through rigorous vacuum degassing, significantly increasing the flex fatigue life of the component during high-frequency operation in abrasive field or mine environments.
- A Southeast Asian mining client used rubber star wheels for ore screening equipment, which suffered from frequent wear and replacement, increasing maintenance costs by 30% annually. We provided custom cast 85A polyurethane star wheels with steel cores, optimized tooth thickness and hardness for their screening working conditions. The new star wheels have been in use for 2 years with no obvious wear, cutting the client’s maintenance cost by 65% and improving screening efficiency by 20%.
- A vegetable processing facility in North America had constant downtime from rubber wheels clogging with mud during potato sorting. Switching to our custom polyurethane star wheels cut cleaning time by 50% and reduced bruising, leading to higher yield and fewer complaints.
- In Europe, a recycling center faced rapid wear on separator components from mixed household waste; our urethane versions doubled service life, lowered maintenance budgets, and improved sorting accuracy.
Selection Guide of Polyurethane Star Wheels
Proper selection depends on the Hertzian contact stress of your machinery. For abrasive sandy soils, we recommend a 95 Shore A hardness; for high-moisture clay or coal, a lower Coefficient of Friction is prioritized to prevent material buildup and ensure efficient throughput during peak harvesting or mining cycles.
- Confirm the equipment’s working load to select star wheels with matching core and hardness.
- Determine tooth quantity and thickness according to material transmission and sorting needs.
- Select food-grade urethane formula for star wheels used in food processing lines.
- Choose chemical-resistant material for star wheels working in oil or solvent environments.
- Confirm the installation size and shape to ensure perfect fit with your industrial equipment.
- Check the product’s wear resistance and bonding strength for long-term use requirements.
- Run sample validation on target equipment for 30–90 days to measure real wear.
Why should we replace Nylon or Delrin star wheels with Cast Polyurethane?
Polyurethane provides superior impact absorption and a lower noise floor (reduced by 5-10 dB). Unlike rigid Nylon, PU has high elastic memory, preventing bottle tipping and surface scuffing while offering 3x the abrasion resistance, extending service life in abrasive environments.
Can you ensure your PU star wheels are FDA-compliant for food and pharma?
Yes. We use specific MDI-based prepolymers that meet FDA 21 CFR 177.2600 regulations. All food-grade star wheels undergo controlled post-curing at 110 degree C to ensure complete chemical cross-linking, preventing any migratory leaching into the production environment.
Are polyurethane star wheels resistant to oils and cleaning solvents?
Properly formulated urethane compounds resist many oils and cleaning agents; request immersion tests for confirmation.
Can you manufacture star wheels from a physical sample without CAD drawings?
Absolutely. Our engineering team uses 3D laser scanning to reverse-engineer your worn OEM parts. We then provide a DFM (Design for Manufacturing) report to optimize the geometry for better performance before proceeding with the final cast.
Why did my previous star wheels fracture at the teeth during a jam?
This is usually due to low tear strength (< 35 N/mm) in inferior TPU or poorly cured PU. Our heavy-duty wheels feature a tear strength of 50-60 N/mm, allowing the teeth to flex slightly under stress rather than snapping.
Do you offer anti-static (ESD) polyurethane for electronic packaging?
Yes. We can integrate conductive carbon or specialized additives to achieve a surface resistivity of 10^6 to 10^9 Omega/sq, preventing static discharge that could damage sensitive components or attract dust in cleanroom environments
What is your policy on samples and material testing?
We provide material plaques for chemical compatibility testing and small-batch prototypes for fitment trials. Every shipment includes a Certificate of Conformance (CoC) and a physical property test report (Hardness, Tensile, and Density).
What is warranty of products?
All of products with 3-6 months guarantee (except very frequently wearing parts).
How do you deal with after sales service?
We will response in 24 hours with solutions such as replacement or reworking.
