Process and apparatus for preparing waste paper for reuse

Details Process and apparatus for preparing waste paper for reuse Process and apparatus for preparing waste paper for reuse

1979-03-27

1982-11-23

Smith, William F.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 29, 210703, 210712, 210806, 210928, 2101951, D21C 502

Patent

active

043604021

ABSTRACT:
A process and apparatus for preparing waste paper for reuse in a paper machine. Waste paper, water and de-inking chemicals are introduced to coarse pulping apparatus, and the coarsely pulped stock suspension is then thickened by filtration and treated in a reaction tower. The pulp is then thinned and passed through flotation apparatus to remove separated impurities, particularly printing inks. Water removed from the pulp in the thickening operation is passed through second flotation apparatus with the clean water therefrom being reintroduced to the apparatus.

REFERENCES:
patent: 3994770 (1976-11-01), Lausch

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