Deinking of recycled pulp

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Waste paper or textile waste

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162 5, 162 55, 162 57, D21B 108, D21B 132

Patent

active

054531594

ABSTRACT:
A process for separating printing ink from recycled paper fiber includes the steps of repulping recycled paper furnish with water in a rotary mixer for about 5 minutes at a consistency of 6% to 18% with a mixing element having a top speed no greater than 2,000 ft/min. This first stage repulping and mixing is followed by a second mixing stage of 20 to 45 minutes with a mixing element tip speed of 2,500 to 4,000 ft/min. Agglomerated contamination particles in the resulting slurry are removed by centrifugal cleaning and slot screening.

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W. J. Fondow, "Pulping Of Secondary Fiber", Proceedings, Contaminant Problems, and Strategies in Wastepaper Recycling, TAPPI (1989), 21-31.

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