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What are the paper chemicals?

Paper machine wet end chemicals are divided into two categories based on the differences between their functions:
 
One class is functional chemicals such as AKD, dyes, brighteners and fillers that directly affect the physical and optical properties of the paper.
 
The other is chemicals used in process control, such as retention aids, wet-end starch, fungicides, paper loss control agents, and the like. The primary role of these chemicals is to maintain the proper functioning of paper machines and indirectly affect paper performance.
 
Different pulps are separately beaten and mixed in proportion to enter the short circulation system. The pulp is first diluted with concentrated white water, and after removing sand, degassing, and sieving, it enters the headbox. In this system, various wet-end chemicals are added to the pulp to achieve a paper application effect.