Browsing by Author "Cakicier, Nevzat"

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The Effects of Protective Dye Layer Applied on Varnish Layer Hardness, Scratch Resistance and Glossiness of Various Blockboard Types
(Academic Journals, 2011) Cakicier, Nevzat; Korkut, Suleyman; Korkut, Derya Sevim; Kurtoglu, Ahmet; Erdinler, E. Seda; Ulay, Goksel
This study is carried out for determining the changes occurring on the amount of the material used on the protective layer when polyurethane and acrylic (lacquered) dye is applied on the test samples prepared from sandwich type composite (blockboard) boards with their surface coated or uncoated with paper, which are used for the yacht furniture and interior decoration. After applying polyurethane and acrylic dye on the 30 test samples prepared as coated or uncoated with paper with 10 x 10 x 1.6 cm sizes from blockboard, the surface hardness values of the protective layer as applied in ASTM D 436695 (1984) were determined, the scratch resistance were determined according to the essentials specified in TS 4757 (1986), and the glossiness were also determined according to the essentials specified in TS 4318 EN ISO 2813 (2002). According to the result of the study, concealing dyeing is obtained with much surface hardness, scratch resistance and glossiness by using less lacquer dye on the boards coated with paper. With this study, it is possible to suggest that coating with paper before lacquer dyeing can be a preferable application in terms of cost and time saving.
The Influence of Artificial Weathering on the Adhesion of Some Varnishes Applied to Thermally Treated Iroko and Ash Woods
(Taylor & Francis Ltd, 2025) Ulay, Goksel; Cakicier, Nevzat
In this study, waterborne and solventborne varnishes were applied to the surfaces of ash (Fraxinus angustifolia Vahl.) and iroko (Chlorophora excelsa) woods which were heat treated at 190 degrees C for 1.5 h and 212 degrees C for 2 h according to the thermowood method. The influence of 576 h of aging process on varnish adhesion was determined by pull-off test according to ASTM-D 4541 in UVB-313 EL type aging device. As a result, wood species, varnish type and aging time were found to have a different level of influence on the adhesion strength of varnish layers. The highest adhesion value of 4.804 MPa was obtained in the sample with one-component waterborne varnish applied to ash wood, which was heat treated at 190 degrees C for 1.5 h and aged with UV-B lamp for 144 h.
The Effect of Weathering on Color and Glossiness Properties of Polyurethane-Modified Water-Based Varnish Layers Applied to Thermally Treated Ash Wood
(North Carolina State Univ Dept Wood & Paper Sci, 2025) Ulay, Goksel; Akter, Mete; Cakicier, Nevzat; Peker, Huseyin; Ayata, Umit; Atilgan, Abdi; Ciftci, Seymen
The effects of artificial weathering (168, 336, and 504 h) on the glossiness values and color parameters of varnished, polyurethane-modified ash wood were investigated. Samples included control samples without treatment and thermally treated samples under two different conditions (190 degrees C for 1.5 h and 212 degrees C for 2 h), all coated with a polyurethane-modified water-based varnish. In non-thermally treated and varnished samples, decreases in L* values were observed after weathering, while increases were noted in h(o), C*, b*, and glossiness at 60 degrees in both perpendicular and parallel directions to the fibers. After weathering, for samples thermally treated at 190 degrees C for 1.5 h and varnished, increases were observed in glossiness values at 20 degrees and 60 degrees in both directions, as well as in L*, b*, and h(o) values. Conversely, decreases were noted in a* and C* values. In samples thermally treated at 212 degrees C for 2 h and varnished, increases in a*, L*, h(o), b*, and C* values were detected after weathering, whereas decreases were observed in glossiness at all angles (20 degrees and 60 degrees) in both directions. The triangle E* values showed a decreasing trend in non-thermally treated varnished samples after weathering, while an increase was observed in samples thermally treated at 212 degrees C for 2 h and varnished.
Determination of Color Characteristics of Some Wood Species Treated With Bleaching Chemicals
(North Carolina State Univ dept Wood & Paper Sci, 2023) Cakicier, Nevzat; Ulay, Goksel
With the application of bleaching treatments, the color of the wood material changes. When different bleaching agents are applied to the same wood, different results are likely to be obtained. In this study, wood species doussie (Afzelia africana), iatandza (Albizia ferruginea), merbau (Intsia bijuga (Colebr.) O. Kuntze), mahogany (Swietenia mahagoni L.), and hornbeam (Carpinus betulus L.) along with one and two component (B -One-C and B-Two-C) wood bleaching chemicals were applied to the wood material surfaces with sponge technique. Then, color parameters (ho: hue angle, a*: red color tone, b*: yellow color tone, C*: chroma, and L*: lightness) were determined on bleached and unbleached materials. According to the results obtained, B-One-C application increased ho, a*, b*, C*, and L* values in all wood species. The highest increment E* values were determined in mahogany, doussie, hornbeam, and merbau wood species treated with B-Two-C. The chemicals used in the study showed different results on the same wood.