Color Coated GI Corrugated Panel

Color Matching Precision
Pre-painted coil color consistency is maintained through spectrophotometric control with dE*ab <0.4 tolerance. In-line spectrophotometers (0°/45° geometry) measure L*a*b* values every 5 meters at 10nm intervals across 360-750nm spectra. Real-time feedback adjusts tinting pumps delivering 0.1-10g/min pigment dispersions. Master batches are formulated from ISO-compliant pigments (e.g., CI Pigment Red 254 for Ferrari red) with particle size D50=0.2-0.8µm for optimal opacity and dispersion stability. Metallic colors utilize leafing aluminum pastes with 10-40µm flakes oriented parallel to the substrate via magnetic fields.

Technical rigor ensures visual perfection:

• Lighting Conditions: Colors certified under D65 illuminant with CIE 1931 observer.

• Angle Dependency: Multi-angle spectrophotometers measure flop for metallics (ΔL*<1.5 at 15°-110°).

• Batch Consistency: Statistical process control maintains σ<0.15 for L* over 100 coils.

• Metamerism Index: <0.8 under F11 vs D65 lighting.
  Digital archives store reflectance curves for 50,000+ colors with 10nm resolution. Post-application, curing kinetics are optimized to prevent flotation (pigment separation) causing mottling. The system achieves automotive-grade color matching – critical for appliance and building panel continuity across global projects.