Printing coated whiteboard paper yellowing, how to sweep yellow

With the growing demand for high-quality packaging materials, coated whiteboard paper has become a popular choice for premium packaging due to its elegant appearance and superior finish. However, one of the major challenges faced by manufacturers and users is the yellowing phenomenon, which occurs when the whiteness of the paper decreases after prolonged storage or exposure to sunlight. This discoloration not only affects the visual appeal but also reduces the market value of the final product. Understanding the causes of yellowing and developing effective methods to maintain the whiteness of coated whiteboard paper has become a key concern in the industry.

1. The Mechanism Behind Yellowing in Coated Whiteboard Paper

Recent studies have shown that the yellowing of coated whiteboard paper is primarily caused by oxidation reactions between the surface material and oxygen in the air. These reactions alter the chemical structure of the paper, leading to a loss of whiteness over time. The extent of yellowing depends on the degree of oxidation, which is influenced by three main factors: high temperature, ultraviolet (UV) radiation, and the pH level of the paper. When exposed to these elements, the chemical bonds in the paper can break down, resulting in discoloration.

2. Key Factors Contributing to Yellowing

Through analysis of the oxidation process and the composition of coated whiteboard paper, several factors have been identified as contributing to the yellowing phenomenon. These include the base paper used, the type and quality of optical brighteners, color pigments, and the coating adhesive. Each of these components plays a role in either accelerating or mitigating the yellowing effect. For example, improper use of whitening agents or poor pigment stability can significantly impact the long-term appearance of the paper.

3. Preventive Measures and Solutions for Yellowing

3.1. Optimizing the Base Paper Production Process

To reduce yellowing, it is essential to improve the base paper's formulation. Using bleached chemical wood pulp and increasing the amount of surface pulp can enhance the paper's resistance to discoloration. Additionally, adjusting the sizing process to maintain a medium-alkaline pH (between 6.5 and 8.0) helps stabilize the paper's properties. Controlling drying temperatures and using cold cylinders during production can further minimize the risk of yellowing.

3.2. Selecting High-Quality Whitening Agents

Liquid fluorescent whitening agents are more effective than powdered ones in reducing yellowing while maintaining the desired brightness. It is important to choose high-purity products to avoid unnecessary waste and potential discoloration. Proper application of the whitening agent carrier, such as an auxiliary adhesive, is also crucial for optimal performance.

3.3. Proper Use of Toning Pigments

Toning pigments help balance the color and reduce the need for excessive whitening agents. They should be selected based on their lightfastness, ease of application, and compatibility with other materials. Using the right amount is essential—too much may increase yellowing, while too little may not achieve the desired whiteness.

3.4. Choosing the Right Coating Adhesive

The choice of coating adhesive significantly affects the paper’s stability and resistance to yellowing. While single-component styrene-butadiene latex is commonly used, mixing it with other types like styrene-acrylic latex can improve both performance and durability. This combination helps reduce yellowing while maintaining the necessary strength of the coated paper.

3.5. Incorporating New Chemical Additives

Innovative additives such as nano-silicon-based oxides show great promise in preventing yellowing due to their unique molecular structure. These materials can effectively absorb UV light and resist degradation. Similarly, ultraviolet absorbers and antioxidants can also play a role in maintaining the paper’s original color over time.

3.6. Additional Considerations

Other factors such as the pH of the coating, the purity of the water used, the moisture content of the cardboard, and proper packaging and storage conditions also contribute to the yellowing problem. Although they may not be the primary causes, addressing them can significantly improve the overall quality and longevity of the coated whiteboard paper.

4. Conclusion

4.1. In practice, solving the yellowing issue of coated whiteboard paper requires careful attention to the base paper, whitening agents, toning pigments, and adhesives. By optimizing the production process, selecting high-quality materials, and adjusting the correct dosages, the yellowing phenomenon can be effectively reduced.

4.2. The use of new chemical additives, such as nano-silicon-based compounds, UV absorbers, and antioxidants, offers additional strategies to prevent discoloration and maintain the paper’s aesthetic appeal.

4.3. Strengthening control throughout the production and storage phases is another critical approach to minimizing yellowing. With proper management and innovative solutions, the quality and appearance of coated whiteboard paper can be preserved for longer periods, meeting the growing demands of the market.

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