The relationship between the properties of montmorillonite and its m icroparticle retention effects on furnish together with the necessity of develop ing montmorillonite-based microparticle retention system, the factors affecting the application of it and the effects of using the microparticle system on rosi n sizing and paper strength was discussed.

This paper mainly describes the effect of the application of the binary paper strengthening system—cation\|polyacrylamide(CPAM) and carboxymethyl cellulose (CMC).

The mechanism which the anionic and cationic surface modifiers both modified the surface of GCC is researched,and studied the applying effect of modified GCC as paper filler The experiment indicated,the filler distinctly improved the filler retention rate and paper strengt

In this work the effect of the microparticle retention on paper strength was also studied,it shows tha.

The results show that the dissolved substanees in DCS will decrease the sheet strengthes and the colloidel substances in DCS will effect the water absorption and air resistance of the sheet.

Addition of fines to a chemical pulp significantly improves sheet consolidation and many dry sheet strength properties.