Kneading Technology to Process Recycled Fiber Pulps and Agglomerate Stickies to Improve Stickies Removal Efficiency by Screening, 2016 Pulping, Engineering, Environmental, Recycling, Sustainability (PEERS) Conference Proceedings
Micro-stickies are not removed with existing screen systems because they are deformable and small enough to pass through the screen slots. However, recent research has shown that a long and gentle kneading treatment of recycled pulp makes the micro-stickies agglomerate to sizes large enough to be easily eliminated with fine slot screens. To demonstrate, recovered office paper pulp obtained from a commercial operation after pulping and large debris removal was selected as a starting material since it contains an abundant amount of micro-stickies. The pulp was kneaded by a Taizen kneader of 3 ton/day capacity. This kneader is designed to maximize friction between the fibers at 25%-30% kneading consistency. The prolonged kneading time of over 10 minutes at 30% pulp consistency raised the pulp temperature to around 80°C. Kneading agglomerated the micro-stickies, generating a fewer number of macro-stickies. It appears that the micro-stickies which are softened by high temperature encounter other stickies during kneading and pressed together to form agglomerates. The sticky agglomerates become larger by a “snowball effect” and also by the inclusion of fibers within the agglomerate. The agglomerate balls were large enough to be easily separated by a fine slotted screen.
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