Biological de-inking method

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

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162 72, D21F 502

Patent

active

057858098

ABSTRACT:
A method of de-inking wastepaper by pulping the paper in the presence of an enzyme is disclosed. The enzyme dislodges the ink particles from the paper fibers. The preferred enzymes are the acid resistant carbohydrases. The de-inking medium is an aqueous solution of the enzyme, preferably maintained at a pH less than about 7 and at a temperature between about 20.degree. C. and about 60.degree. C. No conventional chemical de-inking agents are required. The dislodged ink particles may be removed by any conventional method, such as flotation or washing.

REFERENCES:
patent: 3966543 (1976-06-01), Cayle et al.
patent: 4450043 (1984-05-01), Schulz
patent: 4561933 (1985-12-01), Wood et al.
patent: 4923565 (1990-05-01), Fuentes et al.
patent: 4980023 (1990-12-01), Salkinoja-Salonen
patent: 5110412 (1992-05-01), Fuentes et al.

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