Wastepaper deinking process

Details Wastepaper deinking process Wastepaper deinking process

1992-02-26

1993-07-06

Hastings, Karen M.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Waste paper or textile waste

162 6, 162 7, D21C 502

Patent

active

052250466

ABSTRACT:
The invention relates to a process for the deinking of wastepaper stocks comprising converting the wastepaper to a pulp and contacting said pulp with an aqueous medium having a pH of about 7 or less containing a surface active deinking agent, and thereafter subjecting the resulting pulp-containing medium to one or more wash and/or flotation steps which is carried out at a pH of about 7 or less to remove suspended ink therefrom and to condition said pulp-containing medium for subsequent addition to a paper machine.

REFERENCES:
patent: 4264412 (1981-04-01), Hasler et al.
patent: 4356058 (1982-10-01), Fischer et al.
patent: 4450043 (1984-05-01), Schulz
patent: 4548674 (1985-10-01), Hageman

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