Polyurethane (PU) plastic is widely used in industrial and consumer components such as rollers and wheels due to its unique material properties. The following explains its core advantages, key characteristics, and typical application scenarios:
I. Core Advantages of PU Plastic for Rollers/Wheels
Compared to traditional materials such as rubber, PVC, metal, or nylon, PU offers the following differentiated advantages in roller applications:
High Abrasion Resistance and Longer Lifespan
PU has a low coefficient of friction and a uniform surface energy, resulting in abrasion resistance far exceeding that of ordinary rubber (wear loss can be reduced by 30%-50%). Especially in scenarios involving frequent rolling and contact with rough surfaces (such as logistics vehicles and industrial conveyor lines), its lifespan can be extended by 2-3 times.
Balance of Elasticity and Load-Bearing Capacity, Shock Reduction and Noise Reduction
PU hardness is adjustable (Shore A 60 to D 80), providing sufficient elasticity to buffer vibrations (such as impacts from uneven surfaces) while maintaining shape stability. This avoids the "hard-on-hard" noise of metal wheels, making it suitable for scenarios with high noise reduction requirements (such as hospitals and offices).
Oil and chemical corrosion resistant, adaptable to complex environments
Polyether-based PU is particularly resistant to hydrolysis, greases, and common solvents (such as alcohol and engine oil). In environments such as factory workshops and warehouses where contact with oil or moisture is possible, it is less prone to swelling or cracking, making it superior to natural rubber wheels.
Lightweight and design flexibility
With a density of approximately 1.0-1.2 g/cm³, it reduces the load on equipment. Furthermore, different hardness, colors, or surface textures (such as anti-slip patterns) can be achieved through formulation adjustments to meet customized needs (such as anti-slip wheels for fitness equipment).
Superior cost and overall performance
Compared to polyurethane-coated wheels (metal core + PU outer layer), pure PU injection-molded rollers have higher production efficiency. Compared to high-end rubber wheels (such as silicone rubber), PU offers a more balanced combination of wear resistance and temperature resistance, resulting in a lower overall cost.
AHD PU Hollow Rod
II. Key Characteristics of PU Plastics (Core Performance for Rollers)
Excellent Mechanical Properties
Tensile Strength: 20-50MPa (higher than ordinary rubber's 15-30MPa), strong tear resistance, not easily broken by impact;
Elastic Recovery Rate: ≥80% (rapid rebound after compression, reducing permanent deformation);
Adjustable Hardness: Shore hardness (A 60-D 80) can be controlled through formulation to adapt to different load requirements (e.g., light-load office chair wheels vs. heavy-load industrial casters).
Weather Resistance and Environmental Adaptability
Wide Temperature Range: Conventional PU can be used long-term from -40℃ to 80℃, and special modifications (such as adding cold-resistant agents) can extend this to -60℃; high-temperature PU can withstand short-term temperatures up to 120℃;
Weather Resistance: Resistant to UV aging (after adding carbon black or light stabilizers), less prone to yellowing and embrittlement during outdoor use (superior to unmodified rubber).
Low Friction and Self-Lubricating
The surface friction coefficient is approximately 0.1-0.3 (close to nylon), resulting in low rolling resistance and easier propulsion of equipment (such as handcarts and AGVs).
Easy to Process and Customize
It can be injection molded, cast, or compression molded, supporting the one-time molding of complex structures (such as spoked wheels and multi-grooved wheels), reducing assembly steps; it can also embed metal parts (such as bearings) to enhance strength.
Ⅲ. Typical Applications of PU Rollers/Wheels
Based on the above characteristics, PU rollers are widely used in fields requiring wear resistance, quiet operation, load-bearing capacity, and environmental adaptability:
Logistics and Warehousing Equipment
Handcarts, pallet trolleys, sorting line rollers: Utilizing high wear and oil resistance to handle dust and oil stains on warehouse floors;
Conveyor line driven wheels: Low friction characteristics reduce power loss and improve conveying efficiency.
Industrial Machinery and Automation
AGV (Automated Guided Vehicle) casters: Balancing load-bearing capacity (50-500kg) and flexible steering, PU's elasticity and wear resistance meet the demands of high-frequency movement;
Industrial robot auxiliary wheels: Impact-resistant and tear-resistant, protecting the operation of precision equipment.
Medical and Office Scenarios
Medical bed/instrument cart casters: Quiet operation (≤45dB), shock absorption (avoiding bumps affecting medical equipment), and resistance to disinfectant corrosion;
Office chair/conference table wheels: Lightweight (≤200g per wheel), resistant to frequent chair rotation, and burr-free surface for added safety.
Fitness and Exercise Equipment: Treadmill running belt wheels, elliptical trainer wheels: High elasticity for shock absorption and reduced exercise noise; resistant to sweat and corrosion.
Home Furnishings and Toys: Sofa/coffee table casters: Resistant to floor scratches (such as wooden floors), low-resistance propulsion; Children's toy wheels: Non-toxic, drop-resistant, and wear-resistant, ensuring safety.
Summary
PU plastic, with its high wear resistance, adjustable elasticity, lightweight, and environmental resistance, has become the preferred material for rollers/wheels, especially in scenarios requiring a balance between load-bearing capacity, quiet operation, and lifespan. With advancements in formulation technology (such as the development of ultra-low temperature resistant and high tear-resistant PU), its applications will expand to more demanding industrial environments (such as polar equipment and aerial work platforms).
