The impact of solid content on coating weight is one of the core relationships in the coating process, directly determining coating consumption, cost control, and coating performance.
Below is a systematic analysis, combining data and process logic to explain its impact mechanism and optimization paths:
Dry film coating weight = Wet film coating weight × Solid content
- Target dry film coating weight: 20g/m²
- If solid content is 50% → Required wet film coating weight = 20 / 0.5 = 40g/m²
- If solid content is 70% → Required wet film coating weight = 20 / 0.7 ≈ 28.6g/m²
Conclusion: Higher solid content reduces the wet film coating weight required to achieve the same dry film thickness.
✅ Economic Benefit: Increasing coating solid content can significantly reduce manufacturing costs. For every 10% increase in solid content, the coating consumption per unit area decreases by approximately 12–15%.
- Excessively thick wet film may cause sagging and uneven drying (solvent residue, resulting in rainbow marks, etc.).
- Coating speed is limited.
- Thinner wet film allows higher coating speed.
- Risk: Increased viscosity may lead to reduced transfer efficiency and poor coating leveling.
✅ Risk Control: Adjustments to solid content must be aligned with actual process performance.
- High drying shrinkage stress → Coating cracking/edge lifting.
- Long solvent migration path → Rainbow marks, pinholes, and residual bubbles.
- Inadequate dry film thickness → Reduced barrier properties/wear resistance (e.g., protective films).
- Short leveling time → Orange peel texture and roller marks (leveling agents may be added for compensation).
Contradiction: High solid content saves coating material, but increased viscosity raises the difficulty of coating weight control.
- Solid content and coating weight are the core fulcrums of the "cost-quality-efficiency" triangle.
- Economics: Higher solid content → Lower coating weight → Lower cost.
- Stability: When adjusting the solid content of existing coatings, continuous monitoring of product stability is required.
- Trend: High-end fields are moving toward higher solid content, relying on collaborative innovation in equipment and formulations.
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