During the surface sizing process, it effectively enhances the strength and flatness of the paper, increasing its abrasion resistance, toughness, stiffness, and surface strength. This significantly improves the quality of printing: the uniformity and flatness of the paper are both improved, and it can also form excellent oil-resistant properties on the paper surface, increasing the pass rate and yield of the finished products.

Additionally, during the sizing process within the pulp, it imparts a certain sizing degree to the paper, acting as a protective agent to evenly distribute the sizing agent on the paper surface. This enhances the tensile and bonding strength between the paper fibers, thereby improving the strength and flexibility.

Sodium carboxymethyl cellulose (CMC) for papermaking can also be widely used in the color coating of paper and cardboard. CMC itself offers excellent rheological properties, water retention, film-forming ability, and dispersion of pigments. Moreover, it thins out in viscosity under high shear rates, exhibiting shear-thinning characteristics, which enhances the stability and water retention of the coating. This effectively improves the coating's application efficiency, increasing the coating speed and reducing waste more rationally, while also improving the luster and quality of the coating. Additionally, it serves to protect and lubricate the leaves, reducing scratches on the blades.