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    Investigation of Use of Linden (Tilia tomentosa Moench.) Wood with UV System Varnish Application IN INDOOR Parquet Flooring
    (Inst Technol Drewna, 2023) Ayata, Umit; Esteves, Bruno; Domingos, Idalina; Ferreira, Jose; Efe, Fatih Tuncay; Turk, Mutlu; Cakicier, Nevzat
    Linden wood is used in the making of musical instruments, agricultural hand tools, and in the furniture sector. In this study, the changes in glossiness (parallel (//) and perpendicular (perpendicular to) to the fibers at 20o, 60o, and 85o), the pull -off adhesion test, color parameters (CIEL) and pendulum hardness (K & ouml;nig method) of two different UV curable varnishes applied to linden (Tilia tomentosa Moench.) according to industrial application techniques and exposed to artificial weathering were investigated. According to the research results, while L*, Delta H*, and ho decreased with increasing weathering time in both varnish layers, Delta C*, b*, Delta E*, a*, and C* rose. The pendulum hardness grew for Method B but dwindled for Method A. A decrease was found in the adhesion tests for both varnish methods after artificial weathering. The glossiness was generally reduced due to artificial weathering for all the angles and for both directions, with the exception of 85 degrees in Method A. The variance analysis and homogeneity groups showed that the changes in the adhesion, pendulum hardness, L*, a*, ho, C*, perpendicular and parallel to the fibers for 60o and 85o were found to be significantly different with artificial weathering for both methods.
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    The Effect of Reinforcement with Glass Fiber Fabric on Some Screw Strength of Laminated Veneer Lumber
    (Düzce Üniversitesi, 2015) Bal, Bekir Cihat; Efe, Fatih Tuncay
    Wood based structural composite lumbers are the load bearing components in the buildings. For this reason, it is wanted that wood based structural composite lumbers have the high mechanical performance. In addition, in the connection points, it is wanted the high screw, nail and bolt holding strength. In this study, laminated veneer lumber (LVL) produced from poplar rotary-veneer, and reinforced laminated veneer lumber (RLVL) with glass fiber fabric were investigated. For this reason, screw holding strength, screw head pull-trough strength and lateral screw resistance tests were conducted. For each test, both control group and test groups were set up. The differences between control groups and test groups were investigated with T test. According to obtained data; it was determined that the reinforcement with glass fiber fabric increase the direct screw withdrawal strength, screw head pull-through strength and lateral screw resistance, significantly.
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    UV Sistem vernik uygulanmış iğde odununda renk ve salınımsal sertlik özellikleri üzerine farklı lambalara (UV-A ve -B) sahip hızlandırılmış yaşlandırma etkilerinin karşılaştırılmas
    (2022) Efe, Fatih Tuncay; Çakıcıer, Nevzat; Ayata, Ümit; Gürleyen, Levent; Türk, Mutlu
    Bu çalışmada, iç mekânda kullanılan UV sistem parke (3 ve 5 kat) vernikleri uygulanmış iğde (Elaeagnus angustifolia L.) odununun UV-A 340 ve UV-B 313 lambalarına sahip yapay yaşlandırma ortamına bırakılması ile 252 saat sonunda meydana gelen renk parametrelerindeki [(kırmızı renk (a*) tonu, sarı renk (b*) tonu ve ışıklılık (L*)] ve salınımsal sertlik değerlerindeki değişimleri araştırılmıştır. Araştırma sonuçlarına göre, her iki vernik türünde ve her iki lamba türünde de istatistiki olarak varyans analizi sonuçları bütün testler için anlamlı olarak elde edilmiştir. Her iki vernik türüne ait katmanların, her iki lamba türüne ait 252 saatlik yaşlandırmaya maruz kalmasından sonra L* ve b* değerleri azalırken, a* değerleri artmıştır. Her iki vernik türü içinde UV-B 313 lambalarının toplam renk farkı sonuçları, UV-A 340 lambalarınınkinden yüksek olduğu belirlenmiştir. Salınımsal sertlik değerleri farklı lambalar karşısında farklı sonuçlar vermiştir.