In the papermaking industry, surface sizing is a critical step that imparts desirable properties to the paper, such as improved surface strength, printability, and resistance to water and ink penetration. Sodium Carboxymethyl Cellulose (CMC) has become a preferred additive in surface sizing formulations due to its unique characteristics that significantly enhance these paper attributes.

When CMC is applied as a surface sizing agent, it forms a cohesive and continuous film on the paper's surface. This film acts as a barrier, reducing the paper's porosity. A key benefit of this reduced porosity is improved oil resistance, making the paper more suitable for applications where contact with oily substances is expected. Furthermore, the film-forming capability of CMC contributes to enhanced surface strength and smoothness. This leads to a better tactile feel and a surface that is more receptive to printing inks.

The ability of CMC to control paper curling is another significant advantage. By creating a balanced moisture profile and providing structural integrity to the surface layers, CMC helps to mitigate the tendency of paper to warp or curl. This is particularly important for papers that undergo subsequent processing or are used in high-volume printing environments. The improved stiffness and smoothness imparted by CMC also contribute to better handling and performance in printing presses, reducing issues like linting and powdering.

Moreover, CMC enhances the paper's printability by improving ink absorption and receptivity. The smooth, uniform surface created by CMC sizing ensures that ink is applied evenly, resulting in sharper, brighter printed images. This can also lead to ink savings, as less ink is needed to achieve the desired color intensity. When used in conjunction with other sizing agents like starch, CMC can create synergistic effects, further optimizing the paper's surface characteristics.

For paper manufacturers aiming to achieve high-quality paper products with excellent printability and surface properties, CMC is an invaluable additive. Its multifaceted benefits in surface sizing contribute to both the quality of the final paper and the efficiency of the papermaking process. NINGBO INNO PHARMCHEM CO.,LTD. provides specialized paper-making grade CMC that is formulated to deliver optimal performance in surface sizing applications, ensuring that manufacturers can consistently produce paper that meets the highest standards.