Flotation process for deinking printed waste paper
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United States of America Patent
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Nov 20, 1990
Grant Date -
N/A
app pub date -
Mar 31, 1989
filing date -
Mar 31, 1988
priority date (Note) -
Expired
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Abstract
A flotation process for the de-inking of printed waste-paper by treating the paper pulp in the pulper at alkaline pH-values by means of alkali silicate, oxidative bleaches and separating the loosened printing-ink particles from the fibrous material suspension by flotation, in which protein fatty acid condensates are added finely distributed, possibly together with dispersing agents, in a solution or dispersion which is fluid at normal temperature.
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