Paper plays an important role in society. Even under the highly developed situation of informatization, paper is also one of the necessities of daily consumption. CMC is an excellent dispersant and adhesive, as well as a water-retaining agent capable of emulsifying. Due to these characteristics, it is widely used in the paper industry. And its specific functions are as following:
1. Adding to the wet end of papermaking can effectively improve the bond of pulp fibers and improve the uniformity and strength of paper. Because CMC has an affinity with fibers, it can effectively reduce the loss of fillers and fine fibers, and improve the drainage performance of pulp. As a fiber dispersant, it can make the fibers evenly dispersed and ensure the uniformity of the paper. Combining CMC with wet strength agent or dry strength agent before paper forming can improve the wet strength and dry strength of the paper.
After adding it, the strength of the paper can be increased by 40-50%, and the flexibility can be increased by 4-5 times. The viscosity of the product can be referred to the product of 400-500cps.
2. CMC can be used for surface sizing. After use, the fiber holes of the paper will be sealed by the adhesive film, which can reduce the paper’s absorption of water from the air, and can also avoid the evaporation of water in the paper when the air is dry, prevent the paper from curling or brittle, improve the surface strength and smoothness, and improve paper’s absorption of ink and high quality.
3. CMC is used in paper and cardboard coatings to increase the water retention value, prevent the migration of water-soluble adhesives, improve rheology, and improve the leveling effect of pigments.