Why add surface sizing agent? what is the benefit?

In recent years, with the transformation of the paper industry to neutral papermaking, cheap calcium carbonate series fillers have been widely used in neutral papermaking. The addition of styrene-acrylic surface sizing agent can reach 30%-40% of the total pulp weight. %, it may be higher. With the increase of the filling amount, the sizing effect is poor, the tensile strength and the surface strength are low, and there are even more and more problems such as abnormal production.

These problems have seriously damaged the economic interests of production enterprises and printing units. How to make up for the defects caused by filling has become a concern of many papermakers in enterprises.

Surface sizing is becoming more and more important and is highly valued by the paper industry.

Surface sizing is a better way to increase the printing performance of paper. Surface sizing can increase the water resistance of the paper, increase the physical strength index of the paper, better change the phenomenon of lint and powder loss in the printing process, and increase the printing efficiency and printing quality. Therefore, in order to obtain higher surface strength, printability and paper stability, it is necessary to use surface sizing and choose a better surface sizing agent to increase the quality of the paper.

At present, there are a wide variety of chemical additives used in styrene-acrylic surface sizing agents, which can be roughly divided into two categories: natural polymers and synthetic polymers.
Natural polymer products have the advantages of wide sources, low prices, and easy biodegradation. It has always occupied an important position in the surface sizing agent market.

Starch, guar gum, cellulose and hemicellulose, shellac, gelatin, chitin and sodium alginate are the main natural polymer sizing agents used in the production of cultural paper.

n recent years, synthetic polymer styrene acrylic surface sizing agents have developed rapidly because they can give paper better performance. At present, the choice of surface sizing agent is mainly based on the purpose of surface sizing.