Filler Co-Flocculation With MFC - Novel Predictive Method, 19PaperCon
Different strategies aimed at reducing the negative impact of fillers on paper strength has been the objective of many studies during the past few decades. In some cases, new strategies have even been patented or commercialized. Despite this, a complete study on the behavior of the filler flocs and their effect on retention, drainage and formation has not been found in the literature. Another issue related to the above is connected to the scaling up of these strategies, due to the difficulties in simulating high levels of shear at lab scale similar to those at mill scale.
To address this challenge, a combination of different techniques was used here to compare pre-flocculation (flocculant added to the filler prior to its addition to the pulp) with pre-mixing strategies, also called co-flocculation (chemicals are added to a mixture of cellulose microfibrils and filler).Clear differences in behaviors between different pre-flocculation and pre-mixing strategies were seen, showing the most promising results with CPAM+Bentonite and Cationic Starch systems (for the pre-mixing strategy). Comparing pre-flocculation and pre-mixing strategies; dewatering is negatively affected with pre-mixing, but the mechanical properties are clearly improved, opening a door for optimization. Flocs obtained with CPAM/Bentonite were shown to have a similar resistance with both strategies during testing on a pilot scale flow loop, while Cationic Starch was clearly more advantageous when pre-mixing strategy was used.
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Filler Co-Flocculation With MFC - Novel Predictive Method, 19PaperCon