Person: AYDEMİR, CEM
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AYDEMİR
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CEM
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Publication Metadata only Effects of matte coating on the paper surface and print density(WALTER DE GRUYTER GMBH, 2013) AYDEMİR, CEM; Aydemir, Cem; Ozomay, Zafer; Karademir, Arif; Kandirmaz, Emine ArmanIn this work, standard laboratory printing applications with IGT (ISO 12647-2) were applied on uncoated and matte-coated papers using offset inks (DIN ISO 2846-1). Surface roughnesses of uncoated and coated sheets were recorded to be 195 and 13 ml/min, respectively. Air permanence values of uncoated and coated papers were found to be 5.6 and 0.103 mu m/Pa.s, respectively. Changes in the print densities were recorded up to 48 h. Print density changes for uncoated and matte-coated papers were surprisingly found to be in similar paths (8% in the first 4 h), although significant differences between surface roughnesses were recorded. Furthermore, paper samples showed similar behaviors for the percent volume changes, where drop volume disappeared within 6 min. It is concluded that matte coating did not have any significant effects on print density change and drop volume change.Publication Metadata only A study on the printability properties of alkali-sized recycled papers(WALTER DE GRUYTER GMBH, 2016) AYDEMİR, CEM; Aydemir, CemRecycled handsheets were prepared from old newspapers and old office papers with internal sizing applications of alkyl ketene dimer (AKD) emulsion at 0.5%, 1.0% and 1.5% addition levels as received basis. Handsheets made at 80 g/m(2) were air dried and oven dried as placed in drying rings followed by conditioning prior to testing. The contact angle, surface energy and drop volume changes of handsheets were carefully measured as well as used some offset printing applications. Freeness levels of pulp from newspapers and office papers were measured to be 65 and 45 SR degrees, respectively. It was confirmed that AKD sizing improved paper resistance against water and printing ink, and this was further improved with oven drying. Contact angle values obtained from oven-dried office papers and newspapers were in the range of 105 degrees-95 degrees and 85 degrees-75 degrees, respectively. Without drying, lowest contact angles from newspapers and office papers were recorded to be around 72 degrees and 37 degrees, respectively. Results were in agreement with surface energy values of samples which were around 60 mJ/m(2) for air-dried samples and over 30 mJ/m(2) for oven-dried handsheets. It was concluded that sizing actually improves print quality but may also increase colour change differences over time as represented by Delta E.Publication Metadata only Effects of Filler Content and Coating on the Water and Oil-Based Ink Interactions with a Paper Surface(TAYLOR & FRANCIS AS, 2010) AYDEMİR, CEM; Aydemir, Cem; Karademir, Arif; Imamoglu, SamiThe 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.