Precision Humidity Control Strategies
Key Humidity Control Strategies
1. Strict Environmental Control
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Constant Temperature & Humidity Workshop:
Recommended humidity for coating zone: 40–60% RH;
Temperature: 23±2℃.
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Dew Point Management:
Substrate temperature must be at least 3℃ above the ambient dew point to prevent condensation.
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Local Microenvironment Control:
For plants unable to achieve full constant temperature and humidity, implement local temperature and humidity control at the coating head and oven inlet.
2. Process Adaptation & Adjustment
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Solvent System Optimization:
Under high-humidity conditions: add fast-drying solvents (e.g., toluene, heptane) to accelerate volatilization.
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Curing Parameter Reset:
Under high-humidity conditions: extend curing time by 10–20% and increase temperature by 5–10℃.
3. Substrate Pretreatment
- Substrate Drying:
Dehumidify the substrate using a 50–80℃ heating roll before coating (especially for paper-based / porous materials).
Summary: Special Nature of Humidity Control
Release film coating is far more sensitive to humidity than conventional coatings, so humidity control is critical for release coating, due to the core pain points:
① Platinum catalyst undergoes
irreversible deactivation upon contact with water → catastrophic curing failure.
② Release force requires extremely high precision (within ±10%) → minor fluctuations cause batch rejection.
Solutions must be
prevention‑oriented:
Build a triple defense line through
environmental isolation, substrate dehumidification, and process optimization, rather than relying only on process remediation.
Topwin is one of the leading professional manufacturers and solution providers with more than 20 years of experience, and has domestic top-level engineers in the silicone surfactant industry. Specializing in research and development, production, sales, and marketing of silicone-based special functional performance materials, Topwin also serves as a professional provider of technical services. Now our products are widely used in Polyurethane Foam, Corp Protection, Coatings and Inks, Leather & Textile, Silicone Release Coating for Paper and Film, Personal Care, and others.
