Along with the paper machine speed increase and quality requirements increase, the cationic chemicals are widely used in papermaking, such as cationic polyacrylamideetc.. All of the cationic chemicals have a negative impact on the whitening agentwhitening effect. If the improper disposal of cationic chemicals even few would seriously reduce the whiteness of the paper. Chemical electropositivity is stronger, the effect is large, such as cationic starch with higher degree of substitution of charge density or polyacrylamide is higher, interference on the whitening effect more.
 

　In the high whiteness high-grade culture paper, sizing agent, retention aid agent,whitening agent are additive, not less, how to control their negative effect, control theinterference between them is very important. General measures is the whitening agentand cationic chemicals were added in different sites, or keep it away. It is particularly important to join brightener ingredients before best no cationic additives. In the application of paper chemicals in the careful selection of various materials is very important to add points.