Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With classifying – separating or screening of pulp
Patent
1990-11-29
1992-05-19
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With classifying, separating or screening of pulp
162 57, 162 60, 162 4, 8156, D21D 902, D21D 906
Patent
active
051145367
ABSTRACT:
The fibers of recycled paper are cleaned by agitating the slurry containing the fibers to maintain the fibers in suspension, and contacting the slurry with wash water to remove ink and other contaminants. The apparatus includes a passageway having screens forming opposite sides of the passageway. Agitators are within the passageway, and create enough turbulence to prevent fibers from settling or agglomerating. Channels adjacent to each screen carry wash water, and pump pressure creates a pressure differential across the screens to cause the wash water to contact the slurry and to be removed from the passageway.
REFERENCES:
patent: 4215447 (1980-08-01), Gartland et al.
patent: 4680108 (1987-07-01), Ahs
patent: 4793161 (1988-12-01), Richter et al.
Alvo Steve
Middleton James B.
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