With the rapid advancement of digital technology, the demand for high-quality digital printing has surged significantly. Among various printing techniques, color inkjet printing has become widely adopted due to its versatility and efficiency. As a key consumable in this process, color inkjet printing paper has gained considerable attention for its promising market potential and broad development prospects. In 2000, China’s annual consumption of color inkjet printing paper was under 15,000 tons, but by 2006, the output had reached nearly 100,000 tons, showcasing an impressive growth trajectory. Color inkjet printing paper can be broadly categorized into two types: coated and uncoated. Coated papers are further divided into general-purpose color inkjet paper and high-gloss photo paper. General-purpose paper is ideal for printing renderings and advertisements, offering vibrant colors and realistic effects. High-gloss photo paper, on the other hand, provides a mirror-like finish with excellent ink absorption, making it suitable for high-resolution images that resemble professional photographs. However, it tends to have slower ink absorption and lower water resistance compared to other types. Commonly used color inkjet printing papers include: 1. **High-gloss inkjet paper** – Based on RC (resin-coated) paper, it delivers bright colors, sharp images, and excellent light resistance. It's often used with high-end printers for photo-quality outputs. 2. **Matte inkjet paper** – Also RC-based, it offers a medium gloss finish, suitable for high-resolution photos with vibrant colors and good lightfastness. 3. **Special security inkjet paper** – Contains fluorescent agents and magnetic materials, providing anti-counterfeiting and anti-copying features. It resists UV light and is commonly used in secure document printing. 4. **PVC inkjet paper** – A composite of plastic film and paper, it offers strong mechanical properties, good ink absorption, and indoor light resistance. Ideal for photo-quality outputs and signage. 5. **Glossy thick paper** – Features high whiteness and similar gloss to photo paper, making it perfect for advertising displays and high-quality photo printing. In terms of performance, color inkjet paper must meet several key requirements. It should absorb ink quickly without bleeding, maintain image clarity, and resist fading from light or moisture. The coating should be durable, smooth, and free from static, while also ensuring accurate color reproduction with high saturation and contrast. Several factors influence ink absorption, including the porosity of the coating layer, pigment particle size, and the type of adhesive used. Larger pigment particles create more space between them, increasing porosity and allowing faster ink absorption. Additionally, the ratio of paint to binder affects hydrophilicity and ink absorption speed. A higher paint-to-binder ratio may reduce water absorption, thus slowing down the ink uptake. Overall, the design and formulation of color inkjet printing paper play a crucial role in determining print quality, durability, and visual appeal, making it an essential component in modern digital imaging.

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