The Specific Uses of Sodium phosphate tribasic dodecahydrate in Paper Mills

The notebooks, packaging paper, and toilet paper we use in our daily lives may seem simple, but their production processes involve many intricate details. Sodium phosphate tribasic dodecahydrate, a white crystalline substance, plays a significant role in the papermaking process, enhancing paper quality and streamlining production. Though we rarely encounter it directly, it has a substantial impact on the paper we use.
During the pulp processing stage, Sodium phosphate tribasic dodecahydrate is primarily used to regulate pH levels. Whether the raw material is wood or recycled paper, the pulp must have its pH adjusted after being processed. If the pulp is too acidic or too alkaline, it can affect subsequent processing steps. For example, when using wood as raw material, the pulp may contain some acidic substances. Adding Sodium phosphate tribasic dodecahydrate in the appropriate proportion can stabilize the pH value around 7, a neutral range. Within this range, the fibers in the pulp maintain better tensile strength and are less prone to breaking, resulting in stronger paper during the papermaking process. If the pH is not properly adjusted, the resulting paper may tear easily or become brittle.
It can also help remove impurities from pulp. Pulp inevitably contains small metal particles, resins, and other impurities, which can cause spots on paper and affect its appearance. Sodium phosphate tribasic dodecahydrate can bind with these impurities, causing them to form precipitates that are easy to filter out and are discharged with the wastewater. For example, when producing copy paper, the requirements for impurities are particularly stringent. After adding it, the small white spots on the paper surface are significantly reduced, and the ink adheres more evenly during printing, preventing smudging.
During the paper forming process, Sodium phosphate tribasic dodecahydrate helps fibers bind more tightly. When papermaking, fibers in the pulp must intertwine to form paper. Adding a small amount of Sodium phosphate tribasic dodecahydrate stabilizes the surface charges of fibers and enhances their adhesive force. The resulting paper has a more uniform texture and consistent thickness, without uneven thickness in certain areas. For example, the notebook paper we use does not tear when writing due to uneven thickness, thanks to this compound.
For special papers, such as food packaging paper, Sodium phosphate tribasic dodecahydrate plays a more critical role. Such papers must meet safety standards and contain no harmful substances. During pulp processing, it reduces residual chemicals from other agents while regulating the paper's pH level, preventing contamination of packaged foods due to excessive acidity or alkalinity. For example, wax paper used to package bread, after being treated with it, will not affect the taste or shelf life of the bread due to its own pH level.
It can also be used in the sizing process of paper. Sizing is done to make paper less susceptible to water absorption. For example, the writing paper we use does not smudge when ink is applied because it has been sized. Sodium phosphate tribasic dodecahydrate helps the sizing agent adhere better to the fibers, improving the sizing effect. Such paper is not only easy to write on but also moisture-resistant and has a longer shelf life. For example, archival paper that needs to be preserved long-term is treated using this process.
However, the dosage of Sodium phosphate tribasic dodecahydrate must be carefully controlled during use. If too little is added, the desired effect will not be achieved, and paper quality may be compromised; if too much is added, it will increase costs and may also impart a slight alkaline odor to the paper. Paper mill workers calculate the dosage precisely based on the type of pulp and the intended use of the paper, typically adding a few kilograms per ton of pulp.
Storing Sodium phosphate tribasic dodecahydrate also requires careful consideration, as it is prone to moisture absorption and caking. It should be stored in a dry, well-ventilated warehouse and packed in sealed bags or drums. If it has caked, it must be crushed before dissolving in water for use, as caking can impair its dispersion effectiveness in the pulp.
In summary, Sodium phosphate tribasic dodecahydrate plays a crucial role in the papermaking industry by regulating pH levels, removing impurities, and enhancing fiber bonding, thereby making paper more suitable for our needs. From everyday writing paper to specialized packaging paper, though it may seem insignificant, it genuinely enhances paper quality, making it more convenient and reliable for use.

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