Abstract
Waste paper recycling, grammage reduction, neutralization and closing papermaking system have been advanced from the viewpoint of environmental protection, saving resource, and energy conservation in papermaking industry. The demand for paper quality has risen as well, and the shift to surface chemical that gives the function to paper directly by coating has been advanced more and more.
Surface sizing agent that is one of the surface chemicals is used to give paper water repellency, and various kinds are applied in order to meet the demand for paper quality. It is important for the effective surface sizing to distribute uniformly in the paper surface. The sizing efficiency is greatly influenced by not only the stability and compatibility with other chemicals in coating solution but also characteristics of base paper.
Recently, the quality of surface sizing agent such as its sizing performance and the stability in coating solution has been demanded simultaneously due to the rise of conductivity, calcium concentration in coating solution as the shift to neutralized and highly closed papermaking system. Therefore, in this report, we state our technical attitude, approach for surface sizing. Besides, we introduce the technical trends of surface sizing in China, where the shift to coating chemicals has advanced dramatically.
