preliminary aggregation of controllable filling material using a dual polymer system

摘要

A process for the preparation of a stable dispersion of agglomerated filler particles used in the papermaking process, sequential addition of a first coagulant into the aqueous dispersion of the filler particles and then applying shear to the dispersion, followed by the addition of a second coagulant to the dispersion, the resulting filler mass How it is further sheared to a predetermined particle size, including, bringing a definite and shear resistance of the filler mass having a controllable particle size distribution. Furthermore, a coagulant to neutralize, in addition to the dispersion, the charge of the fillers can be partly or completely neutralized prior to the first coagulant is added.