Process and plant for recycling waste printed papers
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United States of America Patent
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Sep 12, 1989
Grant Date -
N/A
app pub date -
Mar 8, 1988
filing date -
Mar 13, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Process for improving the quality of deinked papermaking pulps obtained byecycling waste printed papers, in which: the papers are converted into a slush pulp (1), most of the ink (12) is removed (11) from this slush pulp, especially by selective primary flotation of the ink, and the deinked pulp is washed (5) to remove the residual ink before being conveyed into the circuit (14) for utilization of the pulp, wherein the waters (24) from this washing (5) are first of all subjected to a selective secondary flotation (16) to remove (17) only the residual ink therefrom, the suspension of the remaining matter (fibers and fillers) (18-23) being subsequently mixed with the pulp (15) originating from the washing (5). The invention also relates to a plant for making use of this process.
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