Person: ÖZOMAY, ZAFER
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ÖZOMAY
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ZAFER
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Publication Open Access Environmentally friendly dyeing of waste cellulose fiberwith natural dye extract obtained from walnut shell(juglans regia)(2023-05-15) ÖZOMAY, MERAL; ÖZOMAY, ZAFER; Kaya S. S., Doğru D., Adeel S., Özomay M., Özomay Z.Cellulose is an important raw material in the manufacture of paper. Cellulose is formed by thefelting, fringing, swelling by absorbing water of the fibers and the combination of these fibersas a result of certain processes. Paper is also obtained by processing plant fibers. It is alsopossible to reuse the waste paper, which are completed in utilization, in paper production byrecovering the cellulose in its structure. Recycling is the process of transforming these wastepapers, which can be reused, into a second raw material by subjecting them to physical orchemical processes. In addition to being sustainable, significant savings are achieved in theamount of raw materials used in paper recycling. In addition, this saving is economicallybeneficial to production due to the high cost of raw materials.In this study, natural dye plants and natural dyeing methods were used to produce paper fromrecycled cellulose with the aim of increasing sustainability. In order to prevent the negativitiesoriginating from the increase in carbon emissions that synthetic dyes cause, it is aimed toincrease the use of natural dyeing methods in paper production. Since natural dye plants areproduced from plant itself or its waste, they do not cause environmental pollution and provideadvantages for recycling.In this study, cellulose fibers were colored with natural dyeing method using walnut shell.Thus, between the fibers, samples colored with walnut shells and samples that were notcolored were examined under two different conditions. Samples were prepared in twodifferent ponds, 5 L and 8 L, with a fixed ratio of solids. Paper sheets were formed with thesieve using the dipping method in the prepared concentration and at the same time, thetechnical properties of the samples were examined by reducing the fibers at a certain rate.Samples were measured in terms of weight, color measurement, light fastness, contact angle,surface smoothness, air permeability and compared with the data obtained.Keywords: Waste paper, Recycling, Natural dyeing, SustainabilityPublication Metadata only 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.