With the rapid advancement of digital technology, the demand for high-quality digital printing has significantly increased. Among various printing methods, color inkjet printing has gained widespread popularity due to its ability to produce vibrant and realistic images. As a key consumable in this process, color inkjet printing paper has emerged as a highly promising product with vast market potential and bright development prospects. In 2000, China's annual consumption of color inkjet printing paper was less than 15,000 tons, but by 2006, the output had already reached nearly 100,000 tons, showcasing an impressive growth trajectory. Color inkjet printing paper can be broadly classified into two main categories: coated inkjet paper and uncoated plain paper. Coated papers are further divided into general color inkjet paper and high-gloss photo paper. General color inkjet paper is commonly used for rendering, advertising posters, and other visual displays, emphasizing vivid colors and lifelike effects. High-gloss photo paper, on the other hand, not only offers strong color expression and rich gradation but also provides a mirror-like finish that enhances image clarity and realism, making it ideal for professional photography and commercial use. However, it tends to absorb ink more slowly and has lower water resistance compared to other types. There are several common types of color inkjet printing paper, each with unique features: 1. **High-Gloss Inkjet Paper**: Made on a RC (resin-coated) base, this paper is ideal for high-resolution images and photo outputs. It delivers excellent gloss, sharp details, and strong color retention, often used with premium inkjet printers. 2. **Matte Inkjet Paper**: Also based on RC paper, this type offers a medium gloss finish, suitable for high-quality photo prints with vibrant colors and good lightfastness. 3. **Security Inkjet Paper**: Designed with special additives such as fluorescent agents and magnetic materials, this paper includes anti-counterfeiting and anti-copying features. It is resistant to UV light and suitable for secure document printing. 4. **PVC Inkjet Paper**: A composite of plastic film and paper, this material offers superior mechanical strength, excellent ink absorption, and good indoor light resistance, making it ideal for photo-based outputs. 5. **High-Gloss Thick Paper**: With a thick paper base and high whiteness, this paper mimics the appearance of photo paper, offering rich color depth and sharp image quality, perfect for large-format displays and advertisements. In terms of performance requirements, color inkjet printing paper must have excellent ink absorption, fast drying, and strong color reproduction. It should maintain image clarity, resist fading, and remain durable under different storage conditions. The coating must be smooth, non-static, and resistant to scratches, while also ensuring good ink adhesion and stability. The ink absorption capacity of color inkjet paper depends on factors like the porosity of the coating layer, the size and shape of pigment particles, and the composition of the binder. A higher porosity generally leads to better ink absorption, while larger pigment particles can increase the void space between them. Additionally, the ratio of paint to color and the type of adhesive used also play a significant role in determining the ink absorption speed and overall print quality.

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