Mechanistic Aspects of Nanocellulose–Cationic Starch–Colloidal Silica Systems for Papermaking, 23TAPPICon

In this paper, we report on optimizing an additive program for a paper machine. Two negatively charged substances (nanofibrillated cellulose [NFC] and colloidal silica) and two positively charged polymers (cationic starch and cationic acrylamide copolymer retention aid) were included in the additive program. Results were described in terms of charge interactions. However, irreversible complexation interactions between the charged compounds seems to be a more valid hypothesis to describe the results for cationic demand, retention of fine particles, flocculation and dewatering of the fibers. The ratio and sequence of charged additive addition and the hydrodynamic shear level affect all the measured properties. The best results were obtained for addition levels of cationic starch between 0.25 and 0.5% based on solid weight of the paper sheet for systems in which the NFC was pretreated with cationic starch. This research is significant since it highlights aspects that should be considered for laboratory tests and paper machine trials when enhanced strength by adding NFC at the wet end is desired.

TAPPI conference proceedings and presentations, technical papers, and publication articles provide technical and management data and solutions on topics covering the Pulp, Paper, Tissue, Corrugated Packaging, Flexible Packaging, Nanotechnology and Converting Industries.

Simply select the quantity, add to your cart and your conference paper, presentation or article will be available for immediate download.