The mechanism of yellowing of coated whiteboard paper

Uncovering the Mystery of Color Change on Coated Whiteboard Paper – Reasons and Countermeasures for Yellowing Phenomenon Introduction: In modern office and teaching, coated whiteboard paper is widely used due to its clean white surface, good handwriting, and easy wiping characteristics. However, over time, these originally snow-white papers may exhibit a yellow hue, known as the phenomenon of “yellowing back”. This article will delve into the root cause of this problem, analyze the main factors affecting the color change of coated whiteboard paper, and propose possible solutions. The structure and composition of coated whiteboard paper are usually made from raw wood pulp fibers, and its surface is chemically treated and coated to achieve ideal performance. The coating material is usually synthetic resin or latex, which gives the paper a shiny surface and smooth feel. In addition, to improve durability and waterproofing, some additives will also be added. The mechanism of yellowing phenomenon 1. Oxidation reaction: Lignin and other carbon containing compounds in paper are easily corroded by oxygen in the air, and undergo oxidation reaction to produce brown substance, leading to yellowing of the paper. 2. Photosensitive effect: UV rays have the shortest wavelength in light and can penetrate the protective layer on the surface of paper, accelerating the molecular aging process and causing paper to fade or turn yellow. 3. Humidity impact: A humid environment may cause paper to absorb moisture, and water molecules can break the chemical bonds inside the paper, promoting the dissolution and migration of certain substances, thereby triggering a color change reaction. 4. Temperature effect: High temperature environment will accelerate the chemical reactions inside the paper, intensify the aging rate of the paper, and promote the occurrence of yellowing phenomenon. 5. Residue pollution: Trace metal ions or other impurities that may exist during the production process will gradually accumulate during the use of paper. These substances may catalyze oxidation reactions under certain conditions, accelerating the discoloration process of paper. Countermeasures to prevent yellowing of coated whiteboard paper 1 Storage condition control: Keep a dry and cool environment, avoid direct sunlight, and regularly inspect and maintain the air purification system to reduce the presence of harmful gases. 2. Packaging protection: Use transparent plastic bags or boxes that are resistant to ultraviolet radiation to package unused whiteboard paper, blocking the exposure to ultraviolet radiation. 3. Use environmentally friendly coatings: Choose a more stable and less prone to aging coating formula, or add chemical additives such as antioxidants and light stabilizers during the production process to slow down the degradation rate of paper. 4. Regular cleaning: For frequently used whiteboards, they should be wiped regularly to remove surface stains and residual substances, reducing the impact of pollutants. 5. Recycling: Minimize the use of disposable coated whiteboard paper and promote reuse, which can save resources and slow down the aging rate of paper. By understanding the mechanism of yellowing on coated whiteboard paper, we can take corresponding measures to extend the service life of the paper and maintain its neat and beautiful appearance. With the continuous advancement of technology, I believe there will be more effective methods to solve this problem in the future, providing users with a better user experience.