Improving Scratch Resistance in Gravure Printing Inks with Wax Additives

Gravure printing inks are widely used in packaging, decorative films, and publishing thanks to their excellent print quality and adaptability to long runs. However, gravure inks face unique durability challenges, such as scratching, rub-off, and gloss control during handling, lamination, and transportation.

To overcome these issues, wax additives—particularly micronized polyethylene (PE), Fischer-Tropsch (FT), and PTFE-modified waxes—have become essential components in gravure ink formulations.

Industry Challenges

1. Scratch Resistance: Printed films often scratch during slitting and lamination.

2. Rub Resistance: Frequent handling leads to ink rub-off, especially in packaging.

3. Slip Control: Proper slip is necessary to prevent blocking and improve process efficiency.

4. Gloss Control: High-end packaging requires controlled gloss or matte effects.

Role of Wax Additives in Gravure Inks

• Scratch & Rub Resistance: Micronized wax particles form a protective surface barrier, minimizing abrasion.

• Slip Enhancement: Waxes reduce surface friction, preventing blocking in stacked films.

• Gloss Adjustment: By varying particle size, wax can fine-tune surface sheen from glossy to matte.

• Heat Resistance: Certain waxes withstand lamination temperatures, ensuring durability.

Application Examples

• Flexible Packaging: A food packaging producer integrated oxidized PE wax, resulting in higher rub resistance and better slip during lamination.

• Decorative Films: A gravure ink manufacturer used FT wax to improve scratch resistance, enabling durable finishes in automotive films.

Technical Considerations

• Particle Size: Ultra-fine wax (<5 μm) ensures clarity in transparent inks.

• Oxidized PE Waxes: Provide better compatibility with polar resin systems.

• PTFE Blends: Deliver maximum slip in high-friction applications.

Gravure inks demand high durability while maintaining print quality. Wax additives provide the critical balance of scratch resistance, slip, and gloss control to meet customer requirements.

Contact us today to explore the right wax additive for your gravure ink system. Our team provides tailored recommendations and samples to ensure your inks perform at the highest level.