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Influence of hydrophile–lipophile balance and sodium tripolyphosphate on the properties of biological deinked pulps
Mayeli, N. & Talaeipour, M.
Abstract
The benefits of bio-deinking of waste paper
are investigated in this study. Enzymatic modification of
mixed office waste paper and old magazine pulps was
performed at two temperatures, 20 and 50 °C. Nonionic
surfactant with different hydrophile–lipophile balance
values and sodium tripolyphosphate was used as the
deinking agent. The deinking process was conducted for
pulps with and without enzymatic treatment. The results
show that, for mixed office waste paper and old magazine
pulps, the highest strength properties are achieved using
lower hydrophile–lipophile balance at 20 and 50 °C, respectively,
while using higher hydrophile–lipophile balance
has a significant influence on the optical properties
at 50 °C. Further, the results show in the presence of
sodium tripolyphosphate, the optical properties of treated
pulps, especially old magazine pulp significantly improved
at 20 °C (ESST system). For mixed office waste
paper, the optimum values of burst, tear and tensile
indices, folding endurance, E-MOD, tensile energy absorption
and elongation are 2.97 (kPa m2/g), 7.68
(mN m2/g), 93.47 (N m/g), 13, 8024 (GPa), 100.16 (J/m2)
and 2.53 (%), respectively. Moreover, the results from
measuring optical properties of handsheets show that the
optimum values of brightness, dirt count, dirt area and
deinking efficiency are 44.72 (%), 11, 0.221 (mm2) and
78.07 (%) correspondingly, while for old magazine, the
formers are 2.35 (kPa m2/g), 6.77 (mN m2/g), 77.77
(N m/g), 9, 6199 (GPa), 72.61 (J/m2) and 2.37 (%) and
the latters are 60.93 (%), 1, 0.005 (mm2) and 99.52 (%),
respectively.
Keywords
Enzymatic modification; Mixed office waste paper; Old magazine; Temperature; Surfactant; Deinking efficiency
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