Sodium carboxymethyl cellulose

Paper grade CMC

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Sodium carboxymethyl cellulose

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Introduction to Paper grade CMC Products
As a wet end additive, paper smoothing agent, and sizing agent, it can be added in various processes such as grinding, wet end, sizing, and coating.

Functional characteristics of papermaking grade CMC
1. Used for wet end addition
The addition of CMC in the wet end of papermaking has the following functions:
(1) Improve the bonding strength between pulp fibers and enhance the physical properties of the finished paper.
(2) As a fiber fraction dispersant, it can evenly disperse fibers, especially in the production of low weight thin paper, ensuring good uniformity of the finished paper.
(3) As a colloid stabilizer for internal sizing agents such as dispersants, AKDs, etc.
(4) Due to the affinity between CMC and fibers and fillers, it produces a retention aid effect, reduces the loss of fillers and fine fibers, and improves the filtration performance of pulp.
(5) Mixing with wet and dry strengthening agents before forming the paper can improve the wet and dry strength of the paper.
The purity requirement for CMC added to pulp is usually not high, usually around 90%, with a degree of substitution of 0.4-0.6. After adding glue, the amount of CMC added to the pulp is 0.2% -0.6% of the dry pulp, and even up to 0.8%. However, CMC is often used in combination with dry and wet strengthening agents or partially replaced. After addition, the paper can enhance its tensile strength by 40-50%, increase its compressive strength by 50%, and increase its flexibility by 4-5 times. 400-500mPa. s medium viscosity products can be selected.
2. Used for surface gluing
CMC has superior film-forming and whole film transferability in the gluing process, and as a dispersant, it can maintain the stability of the entire adhesive material and achieve the desired gluing effect. The specific effects are as follows:
(1) Reduce paper porosity and improve paper oil resistance;
(2) Increase paper smoothness and enhance paper glossiness;
(3) Improve the surface strength and wear resistance of paper, thereby enhancing the printing quality of paper.
3. Used for pigment coating
The main functions of CMC in pigment coating of paper and paperboard:
(1) Improve the water retention value of coatings, prevent the migration of water-soluble adhesives, improve the rheological properties of coatings, and enhance uniformity.
(2) As an auxiliary adhesive, it can replace starch or soy casein, reduce the total adhesive content, increase the solid content of the coating, and reduce the formation of coating patterns (low solid content is prone to coating patterns).
(3) It acts as a lubricant, reducing the wear of the scraper, facilitating membrane separation, and improving the glossiness of the coating.
(4) CMC solution belongs to the pseudoplastic fluid, which becomes shear thinning and is particularly suitable for high solid content coatings and high-speed coating machines.
(5) Prevent pigment aggregation, make the coating more evenly distributed, and endow the coating with good stability performance, making the coating less prone to spoilage during storage.
(6) The carrier of whitening agents has a high retention rate for optical whitening agents.
4. Used for grinding slurry
CMC can lubricate plant fibers in the pulping process, reduce excessive fiber cutting, facilitate pulping, thereby reducing pulping energy consumption and controlling production costs.

Paper grade CMC product indicators
[Refined grade for papermaking industry]

[Technical grade for papermaking industry (coating, gluing)]

[Technical grade for papermaking industry (wet end addition)]

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