Production of pulps with an extremely high fines content for use as strength agent, 18PaperCon

The objective was to optimize the production of fines-enriched pulp (FE-pulp) from chemical pulp. The first trial was a continuous production of FE-pulp with unbleached and bleached never-dried softwood. The pulp was refined using a JC00 equipped with SF filling, and screened with a micro-perforated screen basket with 250 µm diameter holes, but the produced FE-pulp got low concentration, below 3 g/l. The second trial aimed at optimised conditions, using dried bleached softwood. Three fillings, microbar, AA and FF were evaluated in a JC01 refiner, where microbar was most energy efficient. Microbar and AA reached targeted FE-pulp concentration, 10 g/l. The refined pulps were screened with different hole diameters, where, as expected, larger hole diameters resulted in higher concentration but also lower fines content in the FE-pulps. The last trial, the microbar filling was evaluated for never-dried softwood pulp, unbleached and bleached. Now, the refining of unbleached softwood gave 3 times more fines per kWh/ton compared with first trial. These trials demonstrated the importance of the right refining conditions regarding effect of refiner and type of filling to achieve glue-pulp with high enough fines content. With the right conditions, it was possible to produce FE-pulp with high concentration at moderate energy consumption. 

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