OCC Pulping System Optimization for Kraft Liner Board: Equipment Selection and Performance
OCC Pulping System for Kraft Liner Board Production
Old corrugated container (OCC) pulping is the foundation of modern kraft linerboard production. An optimized OCC pulping system directly determines fiber quality, production efficiency, and ultimately the strength properties of the finished linerboard. Modern drum pulpers and high-consistency screening systems achieve over 95 percent fiber recovery while reducing energy consumption by up to 20 percent compared to conventional batch pulping.
Hydraulic Drum Pulper: High-Capacity Fiber Recovery
The hydraulic drum pulper handles 200 to 600 TPD with operating consistency of 4 to 6 percent. Its gentle pulping action preserves fiber length while effectively separating fibers from contaminants. Power requirements range from 132 to 500 kW depending on capacity, with specific energy consumption of 18 to 22 kWh per ton of pulp. The drum design includes a pre-soaking zone and a high-turbulence disintegration zone for complete fiberization.
High-Consistency Cleaning and Screening
After pulping, the stock passes through high-consistency cleaners that remove heavy contaminants at 3 to 4 percent consistency. Pressure screens with 0.15 to 0.35 mm slot baskets remove stickies and lightweight contaminants while maintaining reject rates below 15 percent. Multi-stage screening with forward and reverse cleaners maximizes fiber recovery. The complete screening system achieves fiber loss below 2 percent.
Energy Optimization and Cost Savings
A well-designed OCC system operating at 400 TPD can save approximately 120,000 kWh per month compared to older batch systems. With electricity costs averaging 0.08 USD per kWh, this translates to annual savings of over 115,000 USD. Additional savings come from reduced fiber loss, lower maintenance requirements, and extended equipment life from proper contaminant removal upstream of refining equipment.
Maintenance Recommendations
Screen baskets should be inspected every 1,500 operating hours for slot wear. Pulper rotor and stator clearances require checking every 3,000 hours. Bearing lubrication intervals are 500 hours for high-load positions. Annual shutdown inspection should include complete basket replacement if slot width exceeds 0.05 mm from specification.
Zhengzhou Leizhan Technology provides complete OCC pulping lines from single equipment supply to turnkey solutions. Contact the engineering team for a customized proposal based on fiber type, capacity requirements, and finished product specifications.
Email: leizhanzhang@gmail.com