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1. Main functions
Lubrication and abrasion resistance: micronized wax added to the coating can reduce the coefficient of friction, enhance the abrasion resistance of the can body in the process of high-speed stamping and molding, and prevent the coating from breaking.
Anti-adhesion: prevent the coating surface from sticking when the tanks are stacked or transported, especially under high temperature and high humidity environment.
Surface smoothness: Improve coating leveling, reduce surface defects (e.g. orange peel, pinholes), enhance printing or appearance quality.
Chemical resistance: Some waxes (e.g. PTFE wax) enhance the coating's resistance to contents (acidic beverages, alcohol, etc.).
2. Advantages and challenges
Advantages: low cost, low dosage but significant effect.
Enhance production efficiency (reduce equipment wear and tear, lower scrap rate).
Challenges: Particle size and dispersion need to be strictly controlled to avoid affecting coating adhesion or appearance.
Food safety approvals (e.g. migration tests) are required.
3. Common Wax Types
Polyethylene wax: cost-effective and versatile.
PTFE waxes: temperature resistant, chemically inert, suitable for high performance requirements.
Amide waxes: enhanced slip, but compatibility with resins is important.
