Do polyethylenimine and polyaluminium chloride influence wet end system and paper properties?

The influences of polyethylenimine (PEI) and polyaluminium chloride (PAC) on wet end system and paper properties were discussed based on circulating white water, neutral sizing, double component retention and drainage aid system, filler loading and so forth.

How Pei and PAC can improve APMP pulp suspension?

The application of PEI and PAC can reduce the cationic demand of APMP pulp suspension, improve the furnish drainage,and enhance the SPR of the filler. PEI and PAC can also improve the sizing effect of AKD as well as increase the tensile index, tearing index, bursting index, tearing index and cohesion of paper.

How cationic papermaking additives affect a polyelectrolyte complex?

The anionic trash can form polyelectrolyte complexes with cationic papermaking additives, thus resulting in a low efficiency of cationic additives, increased wet end chemical cost, reduced drainage, poor product quality and inconvenient manipulation of papermaking machine [4-7] .

Does Pei affect furnish drainage aid on APMP pulp?

Thus, PEI has better impact on furnish drainage aid on APMP pulp than PAC. The effect of furnish drainage aid is more obvious when PEI dose ranges from 0 to 0.4%, especially when the dose is lower than 0.2%. The effect of furnish drainage aid decreases when PEI dose is more than 0.4%.