Synchronizing the “Veluwe” Paper Valley
The Challenge of Continuous Speed
The Netherlands maintains its position as a global leader in high-quality graphical and packaging paper through relentless efficiency. In the paper clusters of **Eerbeek** and **Renkum**, modern machines operate at speeds exceeding 2,000 meters per minute. At these velocities, the sectional drive shafts connecting the motors to the dryer cylinders, calenders, and wire rolls become the most critical components for product quality.
The primary enemy is **resonance**. As machine speeds increase, standard cardan shafts often approach their lateral critical speed, inducing vibrations that transfer to the paper web. This phenomenon, known as “barring,” creates periodic thickness variations that ruin paper quality. Furthermore, the environmental disparity—100% humidity in the Wet End versus 120°C heat in the Dryer Section—demands a “Dual-Strategy” approach to sealing and lubrication that generic industrial shafts cannot provide.
The Ever-Power “PM-Velocity” Solution
Ever-Power has introduced the **PM-Velocity™ Series** to meet the specific demands of the Dutch paper industry. We utilize large-diameter, thin-wall tubes made from high-modulus steel (or optional Carbon Fiber composites) to push the critical speed threshold well above the machine’s operating range. This ensures vibration-free transmission even at 3,000 RPM.
For the Wet End, our shafts feature **AISI 316L Stainless Steel** flingers and triple-lip Viton sealing to prevent water ingress. For the Dryer Section, we employ a high-temp thermal expansion compensation spline coated with Molybdenum Disulfide to prevent “stick-slip” during thermal cycling. Our adherence to **NEN-EN 13001** and ISO 12100 standards guarantees that our shafts contribute to the overall safety and uptime of the mill.
Technology Tailored for Paper Makers
Super-Critical Speed Design
Oversized tube diameters increase stiffness, shifting the natural frequency resonance far beyond the machine’s maximum run speed.
Thermal-Comp Splines
Long-stroke splines with low-friction coatings accommodate the thermal expansion of dryer cylinders (up to 20mm) without axial loading.
Paper-Guard™ Seals
Specially designed labyrinth seals prevent the ingress of paper dust and high-pressure cleaning water, preserving bearing life.
Specification Matrix: Series PM-Velocity
Optimized for Sectional Drives (Wire, Press, Dryer, Calender, Reel). Service Factor (SF) > 1.75.
| Grupo de parâmetros | Item de especificação | Alcance / Padrão | Paper Machine Note |
|---|---|---|---|
| Desempenho | Torque Nominal (Tn) | 5 kNm – 350 kNm | Controle de Precisão |
| Desempenho | Velocidade máxima (RPM) | Up to 3,500 RPM | Super-Critical Design |
| Desempenho | Margem de velocidade crítica | > 1,3 vezes a velocidade de operação | Vibration Avoidance |
| Desempenho | Torque de fadiga (Tdw) | 3 kNm – 280 kNm | 24/7 Duty Cycle |
| Desempenho | Nível de equilíbrio | G 2.5 (ISO 1940) | Turbine Quality |
| Geometria | Diâmetro do flange | 120mm – 435mm | DIN 15451 / SAE |
| Geometria | Comprimento (Lz) | Custom (up to 4.5m) | Long Span Capability |
| Geometria | Curso Axial (La) | ± 25mm to ± 120mm | Thermal Expansion |
| Geometria | Diâmetro do tubo | 80mm – 300mm | High Stiffness Ratio |
| Materiais | Material do jugo | 42CrMo4 Forjado | Leve e Otimizado |
| Materiais | Material do tubo | St52.3 / Carbon Fiber | Amortecimento de vibrações |
| Materiais | Revestimento de Spline | Rilsan / Nylon 11 | Deslizamento com baixo atrito |
| Materiais | Tipo de vedação | Viton / FKM | Heat/Water Resistant |
| Padrões | Interface de flange | Chave frontal / Serrilhada | Alto atrito |
| Padrões | Pintura | Epoxy / Heat Resist | Color Coded |
| Padrões | Graxa | Complexo de Alta Temperatura | > 260°C Gotejamento Pt |
| Padrões | Certificação | 3.1 Certificado de Material | Rastreabilidade completa |
| Padrões | Origem | Ever-Power / HZPT | Direto da fábrica |
Sinergia Sistêmica: Integração de Caixa de Engrenagens
A paper machine sectional drive is a complex ecosystem. The motor connects to the gearbox, which drives the roll via the cardan shaft. Any misalignment or vibration in the shaft transmits directly to the gearbox output bearings. We recommend pairing our **PM-Velocity Shafts** with **Ever-Power Precision Paper Mill Gearboxes**.
Our gearboxes feature specialized output shafts designed to handle the axial thermal expansion forces transmitted by the cardan shaft. For the Dutch market, we offer “System Tuning” – analyzing the torsional vibration of the entire drivetrain (Motor-Gearbox-Shaft-Roll) to ensure resonance-free operation at target speeds.
Compatibilidade e Isenção de Responsabilidade
A Ever-Power fabrica componentes de alto desempenho para o mercado de reposição. Referências a marcas OEM como Valmet™, Voith™, Andritz™, or Metso™ São fabricadas estritamente para fins de identificação e compatibilidade. A Ever-Power é uma fabricante independente e não possui qualquer vínculo, endosso ou patrocínio por parte dos detentores dessas marcas registradas. Nossos produtos são projetados para atender aos padrões operacionais da indústria de celulose e papel da Holanda.
2025 Global Leaders: Paper Machine Drive Shafts
Ranked by Balancing Precision, Critical Speed Capabilities, and Supply Chain for the Paper Sector.
| Classificação | Fabricante | Sede | Competência Essencial |
|---|---|---|---|
| 1 | Voith Turbo | Alemanha | Complete PM Drivetrains |
| 2 | GWB (Dana) | Alemanha | Cardan para serviço pesado |
| 3 | Transmissão Ever-Power | China (Global) | High-Speed Balancing & Customization |
| 4 | Maina Power | Itália | Acoplamentos de engrenagem |
| 5 | HzPT Corp | China | Soluções de energia industrial |
| 6 | GKN Fora de Estrada | Reino Unido | Tecnologia de transmissão |
| 7 | Gewes | Alemanha | Eixos de Precisão |
| 8 | Sistemas EP-Drive | China | Integração da caixa de câmbio |
| 9 | Grupo Welte | Alemanha | Eixos compactos |
| 10 | Grupo Elba | Alemanha | Indústria em geral |
Informações de especialistas: Perguntas frequentes para engenheiros de fábricas holandesas
How do you prevent vibration in long paper machine drive shafts?
Vibration usually stems from operating too close to the critical speed. We solve this by using **High-Modulus Steel** or **Carbon Fiber Composite** tubes with larger diameters to increase stiffness. This pushes the critical speed resonance well above the machine’s operating RPM. We also balance every shaft to ISO Grade G2.5.
What is the delivery time for a replacement shaft to a mill in Limburg?
We prioritize the Dutch paper sector. For standard DIN flange sizes (e.g., replacing Voith or GWB units), we can manufacture and air-freight a balanced, painted shaft to Maastricht or Eindhoven within 4-5 weeks. Emergency 10-day manufacturing is available for breakdown situations.
Can your shafts handle the heat in the dryer section?
Yes. Our Dryer Section shafts are equipped with **Viton (FKM) Seals** rated for 200°C and lubricated with High-Temp Synthetic Complex grease. Crucially, our “Thermal-Comp” splines are designed to accommodate the axial expansion of the drying cylinders without locking up.
Are your products compatible with Dutch NEN-EN safety standards?
Absolutely. Every Ever-Power shaft is engineered with a Safety Factor >2.0 for continuous operation, complying with **NEN-EN 13001** and the **Machinery Directive 2006/42/EC**. We provide full technical documentation to support your mill’s safety audits.
© 2026 Ever-Power Industrial Transmission Group. Mantendo a indústria de papel holandesa em movimento.
