Adding process of chitosan in papermaking
Release：2021.10.13Adding process of chitosan in papermaking
1 Add chitosan to the slurry
According to the characteristics of chitosan itself, when chitosan is added to the slurry, it is first adsorbed on the surface of the negatively charged cellulose and is filled between the fibers when paper is formed. This filling effect will increase the bonding area between the fibers. At the same time, many groups on the molecule and the groups on the fiber surface form corresponding chemical bonds (hydrogen bonds, ionic bonds). The chemical interaction between cellulose molecules provides more opportunities to form more hydrogen bonds. Thereby improving the strength of the paper. Add chitosan into the slurry into the following process flow:
Chitosan
|
Cooking----Bleaching----Dechlorination---Pulp-mixing pool---Sweeping pool---High level box
Sizing agent
|||
Coiling----drying---surface sizing---drying---pressing---wire
2 Chitosan surface sizing
As an ideal surface sizing agent, chitosan has many unique advantages. Chitosan molecules contain cationic groups, which can have affinity for the fibers in the paper, and produce strong hydrogen bonding with the carboxyl groups of the fiber molecules; chitosan has good film-forming properties, and the strength of the film is large, which can improve the paper’s Surface strength; chitosan has a low to medium relative molecular weight, and the fluidity of the glue; the source of chitosan is rich, non-toxic, and it is a promising surface sizing agent. The process flow chart of chitosan for surface sizing is as follows:
Steaming → bleaching → dechlorination → pulping pool → front pool → high tank
Chitosan & Sizing Agent
|||
Coiling ← drying ← surface sizing ← drying ← pressing ← net part
