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ÖZOMAY, ZAFER

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ÖZOMAY

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2010 - 201912020 - 20241
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Subject: Fizik Bilimleri ×

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Now showing 1 - 2 of 2
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    Determination of color changes during the drying time of ink in offset printing
    (2010-01-01) ÖZOMAY, ZAFER; ASLAN B., ÖZOMAY Z., KÖSE E.
    In the sheet-fed offset printing technique, the ink physically and chemically drying in accordance with the surface structure of the printing material. Dried ink needs to give a good colour intensity, while constituting a thin film on the surface of printing materials. In this study, the printed ink\"s L *(lightness), a*(red-green), b*(yellow-blue) assets in definite times were measured which change depending on drying in offset printing. With these measures done in the 0, 15, 30, 45, 60 and 90. minutes on spectrophotometer standart drying conditions, how to be affected the color spaces by the drying and the settlement process\" effect on color spaces was examined. The obtained valves were formed in tables and the drying behaviours and the Delta E varietions were carried out. With color valves obtained from CIE L*a*b* kind, in which levels high color exchange occured were determined.
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    Effect of the Coating Formulation on the Barrier Properties and Final Appearance of Non-wettable Hybrid Paper Sheets
    (2024-01-01) ÖZOMAY, ZAFER; UZUN, MUHAMMET; SÖNMEZ, SİNAN; Evren G., Söz Ç. K., ÖZOMAY Z., UZUN M., SÖNMEZ S.
    Thin coating layers of cross-linked polydimethylsiloxane (PDMS) and inorganic particles including glass spheres (GS), colloidal and fumed silica (aero and N20), montmorillonite (MMT), and kaolin (K) were attached onto Grade 1 Whatman filter paper (WFP) substrates using the spraycoating procedure to achieve superhydrophobic hybrid paper sheets. Coating formulations were varied in terms of their PDMS molecular masses and inorganic particles to prepare different samples. The effect of PDMS molecular weight and change in inorganic particle composition on the optical properties, surface roughness, barrier properties, surface chemistry, and topography was investigated. Hybrid paper sheets with ΔE00 values lower than 1 could be achieved, the surface roughness of which could be decreased by increasing the PDMS molecular weight in the coating formulation. Scanning electron microscopy studies revealed a homogeneous coating distribution, resulting in significant improvements in both the air and water barrier properties of the hybrid paper sheets. Spectroscopic investigations revealed the presence of interactions between the coating layer and the underlying paper substrate. Moreover, the distribution behavior of the inorganic particles on the spraycoated surfaces using the proposed method was also investigated using model compounds.