1.How to optimize pigments and coatings?
Pigment dispersion: high-speed sand grinding (particle size ≤ 5μm) + dispersant (polyurethane)
Formula stability: Fixed pigment supplier (e.g. Chemours R-960 for TiO₂), no substitute materials allowed
Metallic paint orientation: Add CAB (cellulose acetate butyrate) or wax additives to control the aluminum powder alignment angle (30°±5°)
Color paste premixing: Use online color mixing system (static mixer + flow meter) to replace manual color mixing
2.What changes will standardization of curing process bring?
Temperature curve: Plate temperature peak (PMT) 230±3℃, furnace temperature zone temperature difference <5℃ (infrared thermal imager monitoring)
Residence time: Curing section 120±5s (speed and furnace length linkage control)
Key point: Avoid over-baking (>250℃ causes pigment charring) or under-curing (<200℃ causes insufficient color development)
3.How to manage the environment and equipment?
Paint shop: constant temperature and humidity (23±2℃, RH 55±5%), cleanliness ISO 7 (particles ≤100,000/m3)
Electrostatic spraying: constant voltage ±1kV (metallic paint requires 60-80kV), rotary cup speed ≥30,000rpm Roller coating system: rubber roller hardness 70±2 Shore A, weekly grinding to prevent deformation
4.Taking typical cases as examples, what are the solutions?
Problem: Strip-shaped color difference (ΔE=1.8) appeared on the refrigerator panel of a production line, and 12 panels were scrapped every hour. Analysis: The middle section of the coating roller was worn by 0.15mm, resulting in thin film thickness in the middle and thick film thickness on both sides (22μm vs 27μm).
Measures: Replace the precision ceramic coating roller + install the automatic film thickness compensation system.
Result: The color difference ΔE was reduced to 0.4.
5.What new technologies will be available in the future?
Digital twin color matching: Predict the formula through spectral simulation to reduce the number of trial coatings (save 20% of paint).
Nano-encapsulated pigments: Silica-encapsulated organic pigments, temperature resistance ↑50%, avoid baking color change.
AI color control system: ◦ Real-time analysis of CCD images, automatic adjustment of paint pump speed (response time <0.5s).