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.