High-Efficiency Deinking and Fine Screening Technology for Premium Cultural Paper
Deinking System Design for Writing and Printing Paper Grades
Premium cultural paper production demands exceptional brightness, cleanliness, and formation. A complete deinking line combines pulping, coarse screening, flotation, washing, and fine screening to achieve ISO brightness levels above 88% from mixed office waste feedstock.
Flotation Deinking Cell Technology
Modern flotation cells operate at 0.8-1.2% consistency with air-to-stock ratios optimized for ink particle size distribution. Multi-stage flotation systems achieve ink removal efficiency of 90-95%, reducing residual ink counts below 20 ppm. Energy consumption for flotation averages 35-45 kWh per ton of deinked pulp.
Fine Screening with 0.10-0.15mm Slotted Baskets
After flotation and washing, the stock passes through fine pressure screens equipped with 0.10-0.15mm slotted baskets. These ultra-fine slots remove residual stickies, shives, and undefibered particles that would cause breaks on the paper machine or defects in the finished sheet. Accept consistency is maintained at 0.5-0.8% for optimal screening efficiency.
Multi-Disc Thickener for Water Recovery
Multi-disc thickeners concentrate dilute stock from 0.8% to 10-12% consistency, enabling closed water loop operation. Filtrate clarity below 50 ppm suspended solids allows direct reuse in the pulping stage, reducing fresh water consumption to 5-8 cubic meters per ton of paper produced.
Brightness Enhancement through Dispersion
Hot dispersion units operating at 90-100°C with 25-30% consistency reduce visible dirt count by 60-75% while improving brightness by 2-4 ISO points. Combined with hydrogen peroxide bleaching, final brightness consistently reaches 88-92% ISO for high-grade cultural paper applications.
Maintenance Schedule for Deinking Equipment
- Flotation cell injectors: clean every 30 days, replace at 18 months
- Fine screen baskets: inspect monthly, typical service life 8-12 months
- Disc thickener filter bags: replace every 6-8 months
- Disperser plates: gap check bi-weekly, replacement at 12-18 months
For detailed equipment specifications or to discuss a deinking line configuration, email the technical team at leizhanequipment@gmail.com.