Double Disc Refiner for Coating Board Production: 15-20% Energy Savings vs Conventional Refining | Leizhan

Double Disc Refiner for Coating Board Production: Precision Fiber Treatment

The double disc refiner (DDR) plays a critical role in coating board production by developing fiber properties essential for multi-layer board formation. Unlike single disc refiners, the DDR uses two counter-rotating discs, providing double the refining intensity per pass while applying gentler fiber treatment. This is particularly important for coating board where fiber length preservation is crucial for bulk and stiffness.

Technical Specifications

• Disc diameter options: 660 mm, 910 mm, and 1100 mm
• Motor power: 250-900 kW with direct drive or gear coupling
• Refining capacity: 50-300 TPD per unit at 3-5 percent consistency
• Disc material: High-chromium alloy or stainless steel with specific plate patterns
• Plate life: 1,500-2,500 operating hours depending on furnish type
• Specific edge load (SEL): 0.5-1.2 J/m for coating board applications
• Energy consumption: 60-120 kWh per ton depending on freeness reduction target

Energy Savings Compared to Conventional Refiners

Double disc refiners deliver energy savings of 15-20 percent compared to conventional conical or single disc refiners. This is achieved through the counter-rotating disc design, which doubles the relative speed between refining surfaces without increasing motor RPM. For a 200 TPD coating board mill, this translates to annual electricity savings of approximately 8,000-12,000 USD.

Impact on Coating Board Properties

Proper refining with a DDR improves several key coating board properties. Internal bond strength increases by 15-25 percent, reducing the risk of delamination during printing. Sheet formation improves as fibers become more flexible, leading to better coating holdout and surface smoothness. Porosity control becomes more precise, which is essential for consistent coating absorption.

Maintenance and Plate Management

• Plate wear measurement: Check every 200 operating hours — use feeler gauge to measure gap uniformity
• Plate replacement trigger: When specific energy consumption increases by 15 percent from baseline
• Hydraulic system oil change: Every 2,000 hours or 3 months
• Disc parallelism check: Every 6 months — misalignment causes uneven plate wear
• Bearing temperature monitoring: Continuous — alarm at 75 degrees Celsius, shutdown at 85 degrees Celsius

For coating board manufacturers, the double disc refiner represents a strategic investment in quality consistency and operational efficiency. Proper plate selection and operating parameter optimization are essential for achieving target board properties while minimizing energy consumption.

For technical specifications and application guidance on double disc refiners for coating board production, contact Zhengzhou Leizhan Technology. Email: leizhanzhang@gmail.com