Top Grade Paper
Created date:2023-10-21

Low iron sodium sulfide is a chemical compound commonly used in various industries. In recent years, its application in the production of high-quality paper has gained significant attention. This article aims to explore the benefits and challenges of using low iron sodium sulfide in the paper manufacturing process.

As a pulp delignification agent, it helps remove lignin, a complex organic polymer that binds cellulose fibers in wood, from the pulp. By breaking down lignin, sodium sulfide facilitates the separation of cellulose fibers and enhances the pulp’s brightness and cleanliness. This process leads to the production of paper with improved appearance, whiteness, and printability.


As a paper bleaching agent. It reacts with residual lignin and other impurities in the pulp to further enhance the brightness and color of the paper. The bleaching process with sodium sulfide helps produce high-grade paper with a clean and uniform color, making it suitable for applications that require a visually appealing and professional finish.


As a pH regulator in the papermaking process. It helps maintain the desired alkaline pH level, which is essential for optimum paper formation and stability. By controlling the pH, sodium sulfide ensures proper fiber bonding and improves the strength, durability, and smoothness of the paper.


It contributes to the paper’s resistance to yellowing and aging and reacts with trace amounts of metal ions, such as iron and copper, which can accelerate the degradation of paper over time. The reaction with sodium sulfide forms stable complexes, preventing the discoloration and degradation of the paper, thereby increasing its longevity and archival quality.

In summary, Low iron sodium sulfide plays a crucial role in the production of high-grade paper. It serves as a pulp delignification and bleaching agent, improving the brightness, cleanliness, and color of the paper. It also acts as a pH regulator, enhancing paper formation and stability. And contributes to the paper’s resistance to yellowing and aging, ensuring its long-term durability and quality.