Method for de-inking printed paper
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United States of America Patent
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Mar 28, 1995
Issued Date -
N/A
app pub date -
Sep 9, 1992
filing date -
Jul 12, 1990
priority date (Note) -
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Abstract
A two phase method for deinking printed waste paper having a mixture of printing inks is shown. The first phase is carried out in a neutral or slightly acid medium and the second phase in an alkaline medium. The first phase has disintegration, ink removal, and thickening steps. The second phase includes mixing and treating the thickened output from phase one with alkaline reagents, removal of any residual ink, and a second thickening. A third treatment of the removed ink and recycling of the media is also indicated.
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