Multi-Layer Coating Board Forming Technology: Ply Configuration and Quality Control | Leizhan
2026-07-15 11:02:25
Coating Board Quality Starts with Precise Multi-Layer Ply Configuration
Multi-layer forming for coating board uses 3-5 individual plies, each with a dedicated headbox delivering a specific furnish. The top ply (30-50 gsm) uses bleached chemical pulp; the filler ply (100-200 gsm) uses mechanical pulp or DIP; the back ply (30-45 gsm) provides curl control. Layer purity above 90% is critical.
FAQ
How many plies does a coating board machine need?
3 plies for standard coated duplex. 5 plies for premium grades. Each additional ply adds $80K-120K equipment cost but saves 15-20% on fiber.
What causes ply separation in coating board?
Ply separation occurs when inter-ply bond strength drops below 150 J/m². Causes: excessive refining, insufficient combining press pressure, or furnish incompatibility.