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    Effects of filler content and coating on the water and oil-based ink interactions with a paper surface
    (Taylor & Francis Inc, 2010) Aydemir, Cem; Karademir, Arif; İmamoğlu, Sami
    The effects of filler and coating on the behaviors of water and oil-based ink on the paper surface were investigated. Fillers reduced the air permeability and surface energy hence increased the liquids uptake. The coating was more effective than the internal addition of fillers for the improvement of water and ink absorption. Sizing interfered with the fillers, but had negligible effects on the movements of oil-based ink on papers. The quality of coating in terms of printing performance was dependent on the improvement of surface smoothness, microcapillary formation and the absorption properties of fillers in the coating layer.
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    Effects of flotation deinking on the removal of main colors of oil-based inks from uncoated and coated office papers
    (North Carolina State Univ Dept Wood & Paper Sci, 2013) İmamoğlu, Sami; Karademir, Arif; Peşman, Emrah; Aydemir, Cem; Atik, Celil
    This paper presents the results of trials to evaluate the color-stripping behaviour of offset printing colors and the effect of coating on deinking performance. Oil-based four-color inks were separately printed as base printing on coated and uncoated white poster paper, and then extensive pulping and deinking processes were carried out. Standard offset printings were conducted on paper samples using cyan, magenta, yellow, and black colors (CMYK), and the effects of deinking efficiency on the removal of each color were analysed. The pulps were made at Micro-Maelstrom Laboratory Pulper at specified conditions with and without bleaching agents. Formamidin sulfinic acid and hydrogen peroxide formulation were used as reductive and oxidative bleaching agents, respectively. Flotation deinking and thickening of pulp were practiced using Degussa flotation and thickening cell. The changes in the optical properties, such as brightness, whiteness, and color value (CIE L?, a? b?) of deinked pulp were determined. It was found that optical properties of color-stripped pulps from coated papers were better than that of uncoated office papers. However, yield was quite low in coated papers since fillers were lost during flotation process. Cyan color was found to be the most difficult one in four main color printing inks stripping out in deinking process.
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    Use of enzyme and ultrasonic energy in paper recycling
    (Karabuk Univ, 2012) Karademir, Arif; Karahan, Selim; İmamoğlu, Sami; Ertaş, Murat; Aygan, Ashabil; Aydemir, Cem; Peşman, Emrah
    Medeniyetin kurulmasında, bilgi depolama ve aktarımında tartısmasız bir yeri olan kâğıt, günümüzde artık çok çesitli amaçlar için hayatın her kademesinde yer almakta, giderek tüketimi inanılmaz boyutlara ulasmaktadır. Kâğıt sektöründe hammadde problemine çözüm için, sürdürülebilir ormancılık çalısmalarından daha ziyade, sürdürülebilir geri dönüsüm teknolojilerini gelistirmek gerekmektedir. Bu anlamda atık sınıfına giren kâğıtın, lifler dısında bulunan bütün bilesenlerini en ekonomik ve çevreci metotlarla ayırmak son derece önemlidir. Bu çalısmada, toner baskılı ofis kâğıtlarının mürekkep ve kirliliklerinden arındırılmasında enzim ve ultrasonik enerji kullanımı konusunda elde edilen bazı sonuçlar tartısılmıs ve geri dönüsüm açısından kâğıt sektörü çevresel açıdan irdelenmistir.