Controlled Filler Preflocculation - Improved Formation, Strength and Machine Performance, 2001 Papermakers Conference Proceedings

The concept of preflocculating filler materials prior to application at the wet end has been discussed in the literature for many years. Many approaches have been taken in developing/investigating such a technique. Differing from other methods of filler preflocculation, a new method has been developed utilizing a specific process, which incorporates not only flocculant but also a controlled level of shear. This generates a treated filler material containing a controlled, increased particle size and charge. Application of this material to the wet end approach system not only provides improved filler retention, but affects the method by which the filler is retained, yielding improved filler distribution.

In February 2000, this preflocculation technology was utilized on a 300 ton-per-day fourdrinier producing coated basestock. Improvements included increased formation, tensile strength, stiffness and machine performance, generating the means to increase filler content replacing softwood fiber. The objective of this paper is to present the results of this investigation, demonstrating the affects controlled filler preflocculation can have on a commercial basis.