“NDI-based Vibration-Free polyurethane load wheels featuring 62% rebound resilience and 0.02 loss factor to ensure zero-vibration, high-speed stability in Japanese semiconductor AS/RS environments.”
Project Background: Challenging the Limits of Micro-Vibration
Location: Kumamoto, JapanIndustry: Semiconductor Wafer Manufacturing & Logistics
Equipment: High-Speed Mini-Load AS/RS (Automated Storage and Retrieval System)
In this project, the client’s automated warehouse is used to store extremely delicate semiconductor wafers. With the stacker cranes operating at speeds up to 4m/s, traditional polyurethane load wheels generated micro-vibrations when passing over rail joints. This caused slight swaying at the top of the mast, which not only compromised fork positioning accuracy but also risked vibration damage to the fragile wafers.
Key Challenges
Vibration Sensitivity: Wafer transport requires a near-zero vibration environment.
1. High-Frequency Operation: 24/7 continuous cycles demand extreme Low Heat Build-up properties.
2. Cleanroom Compatibility: Must meet Class 100 cleanroom standards with Non-marking & Dust-free materials.
3. Noise Regulation: Strict Japanese factory standards required Silent Running performance.
The Solution: Vibration-Free NDI Polyurethane Load Wheels
To meet these rigorous requirements, we provided customized Vibration-Free Polyurethane Load Wheels featuring:
1. NDI-based Elastomer: Utilizing high-performance NDI-based polyurethane, providing superior rebound and damping characteristics to absorb over 90% of rail impact.
| Properties | Our Solution | Industry Impact |
| Material Base | High-Performance NDI | Equivalent to top-tier global standards |
| Hardness | 90 Shore A | Optimal balance of load & damping |
| Rebound Resilience | 62% | Industry-leading vibration damping |
| Loss Factor (tan δ) | 0.02 (@100°C) | Prevents overheating & debonding |
| Tensile Strength | 52 MPa | Maximum durability & zero-dust |
| Compression Set | 28% (@100°C, 24h) | Ensures smooth startup (No flat spots) |
2. Anti-Flat Spot Technology: Ensures the wheels do not develop permanent deformation even when the stacker crane remains stationary at a picking station for extended periods, guaranteeing smooth startup.
3. Precision Grinding Process: Roundness tolerances are maintained within ±0.05mm to eliminate mechanical vibration at the source.
The Results
By switching to our vibration-free polyurethane wheels, the client achieved significant benefits:
1. Improved Positioning: Repeatable fork positioning accuracy increased by 30%.
2. Extended Equipment Life: Reduced mechanical shock to guide rails and gearmotors, extending the maintenance cycle by 1.5 times.
3. Silent Performance: Operational noise was reduced by 12dB, perfectly meeting Japanese environmental standards.
4. Zero Damage Rate: Since installation, there have been zero reports of wafer damage due to transport vibration.
Eliminate Micro-Vibrations in Your Wafer Logistics Today. [Get Expert Consultation]
