Qingdao Tianya Chemical Co Ltd

Application of Sodium Carboxymethyl Cellulose in Paper Making Industry
Application of Sodium Carboxymethyl Cellulose in Paper Making Industry
1. Benefits of adding Sodium Carboxymethyl Cellulose in wet end for paper machine operation and paper quality
(1) Sodium Carboxymethyl Cellulose is a good dispersant. After CMC dissolved into colloidal solution is added into pulp suspension, CMC is very easily mixed with pulp fibers and filler particles, make electronegativity of pulp fibers and filler particles with negative charge increase. According to the principle that the particles with same charge are mutually exclusive, fiber and filler in pulp suspension can get more evenly dispersed. On sheet forming, it can improve paper evenness. Meanwhile, improving evenness is also one of ways to enhancing physical strength of paper.
(2) After Sodium Carboxymethyl Cellulose is added into paper material in wet end, have chemical hydration with hydroxyl of fiber through its carboxymethyl, strengthen bonding force inter fiber, through physical processing by processes, bonding force inter fiber will get improved at a large scale. Its effect will directly reflect on the improvement for almost all of physical strength indexes of paper.
(3) Sodium Carboxymethyl Cellulose Paper Making Grade is of internal sizing function. CMC can not only bring a certain
degree of sizing to paper sheet, but CMC is protective colloid of rosin size and AKD, can promote them disperse into tiny particles and evenly distribute to the fiber, delay the rate of hydrolysis of AKD, and reduce the possibility that hydrolysis of waste pollutes the system.
(4) Sodium Carboxymethyl Cellulose very easily mix with tiny fiber and filler particles, if can select proper cationic additives to mix with CMC, can get obvious synergistic effect. It not only improve the retention of paper machine, but mutually promote each other to improve the retention of additive, and make additive effect more significant. 
2. Paper suitable for adding Sodium Carboxymethyl Cellulose in wet end
In theory, all of paper existing defects such as evenness defects, physical strength, and etc. can be improved by adding Sodium Carboxymethyl Cellulose in wet end of paper machine. To improve the retention of paper machine or the retention of some expensive cationic additives, can use CMC. Anyway, mainly for some special paper and paperboard, such as Decorative paper, map paper, bond paper, tipping paper, cigarette paper, toilet paper, napkin, there are also examples that CMC is successfully applied in news paper and offset paper. CMC price is high in paper chemicals, the added value of special paper and paperboard is high, so it is very worthy to use small quantity of CMC to improve the quality. However, whether CMC is worthy to use in fairly commonplace stuff or not, it can be decided after weighing the advantages and disadvantages.