In the modern era, paper has taken the most important role in the
human life. The pulp and paper industry marks uniqueness with
respect to the noble product coming out of it in the form of paper.
Depletion of forest resources compels the paper industries for
waste paper recycling. Deinking of sorted office paper (SOP) is
very difficult by conventional techniques. Toner particles produced
during conventional repulping process with high cost chemicals are
too large to be removed by the flotation and washing processes and
are a major technical obstacle for greater use of these varieties.
The effect of various enzymes concoctions reduces dirt counts and
ERIC values and improved pulp brightness and deinkability of SOP.
Enzymes concoctions also reduce ink particles size in terms of
number of specks and number of specks/cm3 and stickies. The
increased surface roughness determined by AFM and SEM techniques is
due to ink detachment and FTIR validates the deinking efficiency
due to disappearance of various bands after deinking. A mixture of
enzymes containing cellulase, xylanase, amylase and lipase in
presence of surfactant during deinking is effective to produce
writing and printing grades.
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