Kraft Liner Paper Making Line: Complete Equipment Configuration Guide
Understanding Kraft Liner Board Production
Kraft liner board serves as the outer layer of corrugated packaging, demanding high strength, consistent thickness, and excellent printability. A complete kraft liner production line integrates pulping, screening, refining, and paper machine operations into a continuous workflow. Modern equipment configurations focus on maximizing fiber yield while minimizing energy consumption per ton of finished product.
High-Consistency Pulping System
The pulping stage begins with the Hydraulic Pulper, designed for processing OCC (Old Corrugated Containers) and mixed waste paper. Key specifications include a capacity range of 200-600 TPD, operating consistency of 4-6%, and power ratings from 132 kW to 500 kW depending on production scale. The D-type pulper design provides efficient defibering with the rotor operating at 150-180 rpm, producing uniform pulp slurry suitable for downstream processing.
Multi-Stage Screening and Cleaning
After pulping, the stock passes through a series of Pressure Screens equipped with screen baskets featuring 0.15-0.35mm slot openings. These screens achieve a reject rate below 15% while maintaining fiber recovery rates exceeding 95%. The closed screening system operates at 2.5-3.5 bar differential pressure, effectively removing stickies, plastics, and oversized fiber bundles. High-density cleaners and low-density cleaners complement the screening stage, removing heavy contaminants such as sand, metal fragments, and lightweight plastics.
Precision Refining for Strength Development
The Double Disc Refiner is the heart of the stock preparation system. Available in disc diameters of 660mm, 910mm, and 1100mm, with motor power ranging from 250 kW to 900 kW, these refiners deliver controlled fiber fibrillation. Energy savings of 15-20% compared to conventional conical refiners are achieved through optimized disc geometry and hydraulic gap adjustment. Typical refining energy input for kraft liner production ranges from 80-120 kWh per ton, with freeness reduction of 80-120 mL CSF per pass.
Energy Efficiency and Operating Costs
A well-configured kraft liner line consumes approximately 18-22 kWh per ton of pulp for the pulping and screening stages, and an additional 80-120 kWh per ton for refining. Total electricity consumption for stock preparation runs 100-150 kWh per ton. With energy costs representing 25-35% of total operating expenses, selecting high-efficiency equipment with VFD (Variable Frequency Drive) control delivers measurable ROI within 18-24 months of operation.
Maintenance and Spare Parts Planning
Routine maintenance ensures consistent production quality and minimizes unplanned downtime. Pulper rotor blades require inspection every 3-4 months and replacement at 12-18 month intervals depending on abrasive loading. Screen baskets need cleaning every 2-3 weeks and full replacement after 18-24 months. Refiner plates should be monitored for wear using gap measurement tools, with typical service life of 6-12 months for cast plates and 12-18 months for alloy plates. Maintaining an inventory of critical spare parts including bearings, seals, and V-belts keeps planned maintenance on schedule.
Complete Line Integration for Maximum Output
For mills planning new installations or capacity expansions, Leizhan Technology provides complete engineering services including process flow design, equipment selection, installation supervision, and commissioning support. The equipment portfolio covers every stage from waste paper receiving to finished paper rolls. Each system is configured to match specific production requirements for basis weight range (typically 100-300 gsm), machine width, and daily output targets.
Contact for technical consultation and equipment quotation:
Email: leizhanzhang@gmail.com
Website: www.pulprefining.com