Multi-Layer Coating Board Production Line: Forming Technology and Coating Quality Control | Leizhan

Coating Board Production Technology

Coating board production combines multi-layer forming with precision coating application. The process requires careful control of fiber composition, formation uniformity, and coating formulation to achieve the surface quality demanded by packaging converters.

Multi-Layer Forming Configuration

• Top Liner: Bleached kraft pulp, 25-40 g/m2, high brightness for print surface
• Middle Layer: Mechanical pulp or deinked pulp, provides bulk and stiffness
• Back Liner: Unbleached kraft or recycled fiber, 25-40 g/m2
• Coating Layers: Pre-coating (10-15 g/m2) + top coating (8-12 g/m2) per side

Equipment Specifications

• Headbox: Multi-layer with 3-4 channels, slice opening 12-18mm
• Fourdrinier: 25-30m wire length with dewatering elements
• Press Section: 3-nip, 80-150 kN/m, dryness target 46-48%
• Dryer Section: 36-48 cylinders, 1800mm, 4-5 steam groups
• Coating Station: Blade or air knife, 400-800 m/min
• Calender: 2-4 nips, heated rolls for surface finish

Energy Data

• Steam: 1.8-2.2 tons/ton paper
• Electric power: 350-450 kWh/ton
• Coating drying: 30-40% of total energy

Maintenance Intervals

• Daily: Doctor blade contact check, coating blade inspection, dryer surface monitoring
• Weekly: Wire/felt tracking, steam trap verification, coating preparation system cleaning
• Monthly: Coating blade replacement (or when streaks appear), calender roll surface inspection
• Quarterly: Full dryer inspection, press roll cover check, coating circulation system flush

Contact us for coating board line specifications: leizhanzhang@gmail.com | Zhengzhou Leizhan Technology Paper Machinery Co., Ltd.