Complete OCC Pulping and Screening System for Kraft Liner Board Production
OCC Pulping System Configuration for High-Strength Kraft Liner
The quality of kraft liner board begins with effective OCC (Old Corrugated Containers) pulping. A well-designed system must balance fiber recovery, contaminant removal, and energy consumption. Modern OCC processing lines typically handle 300-600 TPD with fiber recovery rates exceeding 95%.
Hydraulic Pulper: The First Processing Stage
High-consistency hydraulic pulpers operate at 4-6% consistency with power ratings from 132-500 kW. The rotor design directly impacts defibering efficiency and energy consumption per ton. D-type hydraulic pulpers achieve defibering rates of 90-95% within 15-20 minutes, reducing downstream refining load by 15-20%.
Pressure Screening for Contaminant Removal
After pulping, the stock passes through multi-stage pressure screening. Primary screens use 0.20-0.35mm slotted baskets with reject rates maintained below 12%. The screening system removes plastics, hot melts, and stickies that would otherwise compromise liner board strength and surface quality.
Double Disc Refining: Energy-Saving Fiber Treatment
Double disc refiners with 660-1100mm disc diameters and 250-900 kW motors provide controlled fiber development. Compared to conventional conical refiners, double disc units reduce specific energy consumption by 15-20% while achieving target freeness values of 350-450 CSF for kraft liner grades.
Energy Benchmarking and Cost Analysis
A well-optimized OCC pulping and screening system achieves tonnage power consumption of 18-22 kWh per ton of pulp. With electricity costs averaging $0.08/kWh, this translates to approximately $1.44-1.76 per ton. Annual savings of $12,000-18,000 are achievable compared to older systems operating at 25-30 kWh/ton.
Maintenance and Wear Parts Management
- Screen baskets: inspect every 3 months, replace at 12-18 months depending on contaminant load
- Refiner plates: monitoring via motor load trending, typical service life 6-12 months
- Pulper rotor and extraction plate: annual inspection, replacement at 2-3 years
- Seals and bearings: quarterly lubrication, annual replacement schedule
For technical consultation on OCC pulping systems or to request a customized equipment proposal, contact the engineering team at leizhanequipment@gmail.com.