How Paper Factories Use White Fused Alumina in Coated Paper Production

Introduction

White fused alumina (WFA) is well-known as an abrasive material, but its use extends beyond grinding and polishing. In the paper manufacturing industry, WFA is increasingly used as a functional additive in coated papers — helping enhance surface gloss, opacity, print quality, and wear resistance.

1. The Role of Coated Paper and the Need for Additives

Coated papers are widely used in magazines, packaging, and advertising printing. To achieve high gloss and fine print resolution, the paper surface must be extremely smooth and durable. Traditional fillers like kaolin or calcium carbonate provide good whiteness but lack hardness and wear resistance.

This is where white fused alumina offers a solution — combining fine particle size, high hardness (Mohs 9), and chemical stability, making it an ideal substitute or complement for conventional fillers.

2. Coating Process and Integration of White Fused Alumina

The coating process involves applying a fine suspension (coating color) to the paper base. The suspension typically contains pigments, binders, and additives. White fused alumina is introduced during this stage in one of two ways:

As a fine powder additive (1–5 μm): Added directly to the coating formulation to improve micro-level surface texture and gloss.

As a top-coat modifier (0.5–1 μm): Used in high-end printing papers to enhance ink adhesion and scratch resistance.

3. Benefits of Using White Fused Alumina in Paper Coating

• Improved Surface Hardness: Reduces micro-scratches and wear during printing.

• Enhanced Gloss and Smoothness: Fine alumina particles fill in micro-gaps.

• Stable Whiteness: Maintains brightness even after calendering and drying.

• Chemical Resistance: Excellent resistance to ink solvents and moisture.

• Eco-friendly and Non-toxic: Suitable for food packaging and sustainable paper products.

4. Typical Applications

• Premium coated paper for magazines

• High-end art paper and photographic paper

• Packaging board with scratch-resistant surface

• Specialty papers for laser and inkjet printing

Conclusion

White fused alumina provides a new performance dimension to coated papers — not just improving appearance, but ensuring durability and precision in modern printing processes. As sustainable materials gain traction, WFA’s inert and recyclable nature makes it an ideal choice for eco-friendly coated paper manufacturing.