| 摘要 |
The invention relates to mixtures of polyvinylamines and of liquid compositions of cationic amylaceous materials having very specific characteristics in terms of dry matter, viscosity, nitrogen content and pH. By means of this selection, it is possible to produce preparations that are proving to be particularly effective at increasing the dry strength of paper and cardboard. The invention also relates to the use of such mixtures for the production of paper and cardboard, the corresponding production method and the resulting paper and cardboard. |
