On Applications of Sodium carboxymethyl cellulose in Surface Sizing

Sodium carboxymethyl cellulose (CMC) is commonly used in the paper industry for surface sizing applications. Surface sizing is a process in papermaking where a thin layer of sizing agent is applied to the surface of paper or paperboard to improve its surface properties and printability. Here are some key applications of sodium carboxymethyl cellulose in surface sizing:

1. Surface Strength Improvement:
   • CMC enhances the surface strength of paper by forming a thin film or coating on the paper surface. This film improves the paper’s resistance to abrasion, tearing, and creasing during handling and printing, resulting in a smoother and more durable surface.
2. Surface Smoothness:
   • CMC helps improve the surface smoothness and uniformity of paper by filling in surface irregularities and pores. This results in a more even surface texture, which enhances the printability and appearance of the paper.
3. Ink Receptivity:
   • CMC-treated paper exhibits improved ink receptivity and ink holdout properties. The surface coating formed by CMC promotes uniform ink absorption and prevents ink from spreading or feathering, leading to sharper and more vibrant printed images.
4. Surface Sizing Uniformity:
   • CMC ensures uniform application of surface sizing across the paper sheet, preventing uneven coating and streaking. This helps maintain consistency in paper properties and print quality throughout the paper roll or batch.
5. Control of Surface Porosity:
   • CMC controls the surface porosity of paper by reducing its water absorbency and increasing its surface tension. This results in reduced ink penetration and improved color intensity in printed images, as well as enhanced water resistance.
6. Enhanced Print Quality:
   • Surface-sized paper treated with CMC exhibits enhanced print quality, including sharper text, finer details, and richer colors. CMC contributes to the formation of a smooth and uniform printing surface, optimizing the interaction between ink and paper.
7. Improved Runnability:
   • Paper treated with CMC in surface sizing processes demonstrates improved runnability on printing presses and converting equipment. The enhanced surface properties reduce paper dusting, linting, and web breaks, resulting in smoother and more efficient production processes.
8. Reduced Dusting and Picking:
   • CMC helps reduce dusting and picking issues associated with paper surfaces by reinforcing fiber bonding and minimizing fiber abrasion. This leads to cleaner printing surfaces and improved quality control in printing and converting operations.

sodium carboxymethyl cellulose plays a crucial role in surface sizing applications in the paper industry by enhancing surface strength, smoothness, ink receptivity, sizing uniformity, print quality, runnability, and resistance to dusting and picking. Its use contributes to the production of high-quality paper products with optimal printing performance and customer satisfaction.