Pulp and paper products produced from recycled, high lignin cont

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

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162 8, 162100, 162147, D21C 502

Patent

active

055870481

ABSTRACT:
A method is disclosed for producing, in a continuous throughput, high quality paper from recycled waste paper utilizing high consistency, low shear pulping, followed by a series of cleaning steps to produce a wet, friable pulp which is digested and optionally bleached. The resulting pulp can be run on a paper machine alone or blended with virgin pulp to produce a paper containing at least 5% by weight recycled paper with less than 20 ppm per unit area solid non-fibrous contaminants larger than 0.3 mm.sup.2, and which may be blade coated on a high speed paper machine. The pulp and paper produced by the methods are also disclosed.

REFERENCES:
patent: 4737238 (1988-04-01), de Ruvo
patent: 5147503 (1992-09-01), Nguyen
patent: 5538594 (1996-07-01), Hank et al.
Kanazawa "Recovery of Unbleached Kraft Pulp from AOCC . . . Bleached Kraft Pulp" Nov. 1988.
Aikawa et al "Processing OCC, Deinking, Approach Flow Screening" World Pulp & Paper Technology 1990, pp. 102-105.

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