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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Author: Hiroki Nanko and Richard A. Venditti
Kneading Technology to Process Recycled Fiber Pulps and Aggl
Kneading Technology to Process Recycled Fiber Pulps and Agglomerate Stickies to Improve Stickies Removal Efficiency by Screening, 2016 PEERS
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