Starch modifier has been used in sizing process for many years and achieved certain economic and social benefits. Starch modifier is a catalyst to promote the modification of ordinary starch, which can change the characteristics of ordinary starch during sizing and make it become modified starch to meet the needs of warp sizing.

Denatured cationic starch can become an important starch derivative because of its affinity for negatively charged substances. Cationic starch is one of the important chemicals in paper industry, which can be widely used as paper reinforcing agent and surface sizing agent.