acid rosin size的用法和样例：
- The present key problem on bad dispersivity and stabilization of rosin size is solved aptly.
- While the content of free rosin acid in the dispersed rosin sizes is high, the sizing effect is better.
- Rosin sizes is a common sizing agent of paper, the content of free rosin acid is low in common rosin sizes, so the sizing effect is bad.
- The application characteristics of the cationic dispersed rosin size made in lab in neutral papermaking system are studied.