Manufacturing Process
Raw Materials
Base Paper: Made from bleached kraft wood pulp for high strength and dimensional stability.
Coating Components:
Pigments: Kaolin, calcium carbonate, and titanium dioxide for opacity and whiteness.
Binders: Styrene-acrylic latex, starch, or polyvinyl alcohol (PVA) to adhere pigments to the base.
Additives: Dispersants, optical brighteners, and gloss agents to optimize performance.
Production Steps
Coating: High-solids coating is applied to both sides using blade or air knife coaters.
Drying: Through infrared or hot-air drying to remove moisture.
Calendering: Super-calendering under high pressure to achieve uniform smoothness and gloss.
Slitting & Packaging: Converted into sheets or rolls for distribution.
Physical and Printing Properties
Key Properties
Whiteness: ≥90% ISO brightness for vibrant color reproduction.
Smoothness: 600–1,200 s (Bekk method) for sharp print details.
Glossiness: 40–70 GU (Gloss Units) depending on coating formulation.
Stiffness: High bending resistance (e.g., 150–300 mN·m for 300gsm) for structural applications.
Ink Absorption: Controlled porosity ensures quick drying and minimal smudging.
Printing Compatibility
Offset Printing: Ideal for high-resolution images and fine text.
Digital Printing: Smooth surface supports toner adhesion.
Embossing/Die-Cutting: Maintains shape during post-printing processes.
Applications
Packaging
Food & Beverage: Coffee sleeves, cake boxes, and premium chocolate packaging.
Cosmetics: Luxury perfume boxes, skincare product containers.
Electronics: Retail packaging for smartphones and accessories.
Printing & Publishing
Greeting Cards: High-quality finishes for holiday cards and invitations.
Catalogs: Sturdy pages for fashion and lifestyle catalogs.
Posters: Durable substrate for indoor/outdoor advertising.
Creative Industries
Crafts: Scrapbooking, origami, and 3D modeling.
Displays: Point-of-sale (POS) stands and retail signage.
Market Trends
Sustainability
Recycled Content: Increasing demand for FSC-certified and recycled white cardboard.
Biodegradable Coatings: Development of eco-friendly alternatives to traditional petroleum-based binders.
Technological Advancements
UV-Curable Coatings: Faster drying and enhanced scratch resistance.
Custom Finishes: Metallic, matte, or textured coatings for premium branding.
Regional Demand
Asia-Pacific: Dominates production (China, Japan) due to robust packaging and e-commerce growth.
Europe: Focus on sustainable solutions and luxury packaging.
Challenges
Cost Pressures: Fluctuating pulp prices and energy costs.
Regulatory Compliance: Adherence to global food safety standards (e.g., EU's EC 1935/2004).
Competition from Alternatives: Rise of plastic-free packaging materials like plant-based films.
Conclusion: Double-sided white cardboard remains a versatile and essential material in modern packaging and printing, driven by its balance of performance, aesthetics, and sustainability potential. As industries evolve, innovation in coatings and production processes will continue to shape its role in global markets.
For specific product certifications (e.g., FDA, EU food contact), consult local regulations or manufacturer data sheets.
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