The Role of PTFE in Printing Ink Formulations
Printing inks — offset, flexo, gravure, and screen — face surface friction challenges during high-speed printing, stacking, and post-print handling. PTFE micropowder at 0.5–2% loading reduces the coefficient of friction of the dried ink film, preventing set-off (ink transfer between stacked sheets), improving rub resistance (ASTM D5264 Sutherland rub test), and enabling smoother sheet feeding.
Performance by Ink Type
| Ink System | PTFE Loading | Key Benefit |
|---|---|---|
| Sheet-fed offset | 0.5–1.5% | Anti-set-off, improved stacking |
| Flexo (water-based) | 1.0–2.0% | Rub resistance on corrugated |
| Gravure (solvent) | 0.5–1.0% | Slip for overwrap film |
| Screen ink (UV) | 1.0–2.5% | Scratch resistance on POP displays |
| Digital overprint varnish | 0.5–1.0% | Anti-fingerprint, silk feel |
Grade Selection for Inks
- 12 µm — standard, general-purpose rub resistance
- 5 µm — high-gloss inks where transparency matters
- 1 µm — ultra-premium, no visible matting at all
- PTFE/PE wax blend — cost-effective for corrugated flexo
vs. Alternative Slip Additives
| Additive | COF Reduction | Transparency | Rub Resistance | Cost |
|---|---|---|---|---|
| PTFE micropowder | Excellent | Very good | Excellent | Medium |
| PE wax | Good | Good | Good | Low |
| Carnauba wax | Moderate | Excellent | Moderate | Medium |
| Silicone additive | Excellent | Excellent | Poor (smear) | Medium |
PTFE is the only additive that provides both excellent slip AND excellent rub resistance. Silicones give slip but cause smearing under pressure. Waxes are cheaper but provide less rub resistance.
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