Combined de-inking technology applied on laser printed paper

Review on recent developments on pulp and paper mill wastewater treatment

“…in the toner are generally melted and then adhered with carbon black on the paper in printing process. Hence, traces of such materials together with electric-magnetic iron oxide can be found in the produced wastewater contents (Zhenying et al, 2009). A sample characterization of RCF mill wastewater for various physicochemical components, measured by Zwain et al (2013), is shown in Table 1.…”

“…Screening is responsible for the removal of large particles with high and medium density, such as paper clips and staples. De-inking can be considered as the main stage of the RCF recycling process which basically consists of separation of ink particles from the cellulose fibers and removal of the detached particles from pulp slurry by washing for ink particles less than 25 mm in diameter (Borchardt et al, 1998) or floatation for larger particles such as toner inks and laser printed papers (Zhenying et al, 2009). Large amount of toxic substances, such as H 2 O 2 , NaOH, Na 2 SiO 3 , Na 2 CO 3 , and other compounds like surfactants, are currently applied as chemical de-inking agents with the aim of improving the brightness of the produced pulp (Zhang et al, 2008).…”

Perspectives on Membrane Bioreactor Potential for Treatment of Pulp and Paper Industry Wastewater: A Critical Review

“…Deinking can be considered as the main step of the recovered fibers recycling process, which chiefly consists of separating of ink particles from the cellulose fibers by washing those of less than 25 mm diameter or floating larger particles such as toner inks and laser printed papers. 22,23 Toxic substances, such as H 2 O 2 , NaOH, Na 2 SiO 3 , Na 2 CO 3 and other compounds are currently used as chemical deinking agents with the purpose of brightness improvement of the recycled pulp. 24 Generally, impurities such as sand, glass, plastic, coatings and fillers are separated from waste papers during recycling process.…”

Destintado de papel de impresión láser mediante ultrasonido con dos frecuencias, 25 y 45 kHz

“…El destintado tradicional es altamente efectivo para reciclar residuos de papel litográfico y flexográfico. Sin embargo, el papel residual impreso con toner de tintas curadas por UV no puede ser eficientemente limpiado por el destintado convencional, debido a la composición química de las tintas y de la forma en la que se adhieren a la fibra (Fricker et al, 2007;Zhenying et al, 2009). Las partículas de toner usadas en la impresión láser están hechas de negro de carbón, óxido de hierro, poliestireno, poliamida y poliéster, entre otros productos, y se usan para adherir el negro de carbón al papel cuando se derrite durante el proceso de impresión.…”

“…La meta principal de este estudio fue analizar los efectos de un tratamiento de ultrasonido en dos frecuencias (25 y 45 kHz), aplicados bajo tres tipos de modulación pulsada y combinado con etapas de flotación y lavado, a fin de mejorar they adhere to the fiber (Fricker et al, 2007;Zhenying et al, 2009). The toner particles used in laser printing are made of carbon black, iron oxide and thermoplastic resins.…”