RENK SUPREX Enhances Polyolefin Compounding Efficiency

In the fast-evolving field of polyolefin composite manufacturing, efficiency, cost-effectiveness, and quality remain paramount concerns. Traditional drive systems have long presented challenges: excessive energy consumption, prohibitive operational costs, frequent maintenance requirements, and the difficult trade-off between production speed and product quality.

In 1999, RENK—a leader in drive technology—introduced the groundbreaking SUPREX twin-screw extruder gearbox, marking a new era for polyolefin composite production. At its core lies an innovative integrated planetary gear stage , enabling wide-range variable-speed operation while optimizing energy efficiency, cost-effectiveness, and sustainability.

Unlike conventional systems that pair a large fixed-speed main motor with an equally powerful variable-frequency drive (VFD), SUPREX employs a strategic "large-small" configuration : a primary fixed-speed motor supplemented by a smaller, variable-speed drive unit (VDS). This approach delivers three transformative advantages:

• Enhanced energy efficiency: Optimized power distribution minimizes energy losses during low-load operation
• Reduced capital and operational costs: Smaller VFD units significantly lower both initial investment and long-term expenses
• Future-proof design: Standardized, commercially available VFD components simplify upgrades and extend system longevity

With single-output shaft torque reaching 500 kNm , SUPREX delivers reliable performance under demanding conditions. Its flexible center distance range (205-349 mm) accommodates various extruder configurations, while two bearing options— wear-resistant slide bearings and high-capacity roller bearings —address diverse operational requirements.

The slide bearing version achieves maintenance intervals exceeding 10 years , offering:

• Dramatically reduced maintenance costs
• Minimized production downtime
• Exceptional operational continuity

SUPREX's stepless variable-speed capability enables precise screw speed adjustment critical for:

• Optimal material mixing and dispersion
• Enhanced product physical properties
• Consistent high-quality output

The system achieves 2.5% higher overall efficiency compared to conventional configurations, translating to:

• Reduced energy consumption
• Lower operating costs
• Sustainable production practices

Standardized VFD components ensure:

• Reduced obsolescence risk
• Cost-effective upgrades
• Long-term investment protection

SUPREX's slide bearing technology eliminates rolling elements, instead utilizing precision-machined sliding surfaces that deliver:

• Simplified construction
• Exceptional load capacity
• Minimal wear characteristics
• Ultra-low maintenance requirements

Key performance parameters include:

• Rotation: Co-rotating
• Center distance: 205-349 mm
• Output torque: 100-500 kNm (single shaft)
• Gear ratio: 5-14
• Input speed: 1,200/1,500 or 1,800 rpm
• Standards: DIN/AGMA compliant