Deinking of recycled pulp

Details Deinking of recycled pulp Deinking of recycled pulp

1993-11-04

1995-09-26

Jones, W. Gary

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

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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