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Investigation of Use of Linden (Tilia tomentosa Moench.) Wood with UV System Varnish Application IN INDOOR Parquet Flooring

Ayata Ümit, Esteves Bruno, Domingos Idalina, Ferreira José, Tuncay Efe Fatih, Türk Mutlu, Çakicier Nevzat, Gürleyen Levent, Peker Hüseyin

Drewno : prace naukowe, doniesienia, komunikaty

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2023

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Vol. 66, nr 212

Art. no. 177636

EN

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 (⊥) to the fibers at 20o, 60o, and 85o), the pull-off adhesion test, color parameters (CIEL) and pendulum hardness (König 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*, ΔH*, and ho decreased with increasing weathering time in both varnish layers, ΔC*, b*, ΔE*, 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 85º 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.

2

Effect of accelerated ageing on some surface properties of UV-coated hackberry (Celtis australis L.) wood parquet

Ayata Ümit, Esteves Bruno, Gürleyen Levent, Çakicier Nevzat, Ferreira Jose, Domingos Idalina, Türk Mutlu

Drewno : prace naukowe, doniesienia, komunikaty

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2021

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vol. 64, nr 208

17--33

EN

The importance of UV-curable coatings is currently increasing. In the parquet industry, where UV systems are applied, it is beneficial to investigate new tree species as potential raw materials. This study was carried out to determine the effect of accelerated ageing on some surface properties of hackberry (Celtis australis L.) wood treated with UV system parquet varnish. UV system parquet varnishes were applied to hackberry wood surfaces in three and five layers, according to the requirements of industrial applications. The varnished surfaces were then exposed to UV rays for 252 and 504 h using UVA-340 lamps in a QUV ageing device. Glossiness, colour parameters, pendulum hardness and adhesion strength (pull-off) (MPa) were determined for the coated samples before and after ageing, and the results for the aged and unaged test samples were compared. Analysis of variance showed that the results were significant for all tests. The results for all tests varied by ageing time.

3

Effect of heat treatment on the colour and glossiness of black locust, wild pear, linden, alder and willow wood

Esteves Bruno, Ayata Umit, Gurleyen Levent

Drewno : prace naukowe, doniesienia, komunikaty

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2019

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vol. 62, nr 203

39--52

EN

In this study, samples of wood from black locust (Robinia pseudoacacia Lipsky), wild pear (Pyrus communis L.), linden (Tilia platyphyllos), alder (Alnus glutinosa L. Gaertn.) and willow (Salix alba) were treated at 212°C for 1 hour and 2 hours according to the ThermoWood heat treatment procedure at the Novawood Factory in Gerede, Bolu (Turkey). Colour and glossiness were tested and compared with untreated samples. The results showed that overall, lightness decreased, while the behaviour of a* and b* values depended on the species and on the initial colour. Differences in lightness and a* between species were equalized by heat treatment. Gloss at 20° and 60° angles decreased with heat treatment for both perpendicular and parallel directions, while at 85° an equilibrium was reached between the decrease in gloss due to the heat treatment and the increase due to the lower roughness of the heat-treated surface.

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The effects of heat treatment on colour and glossiness of some commercial woods in Turkey

Gurleyen L., Esteves B., Ayata U., Gurleyen T., Cinar H.

Drewno : prace naukowe, doniesienia, komunikaty

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2018

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vol. 61, nr 201

81--90

EN

In this study, hornbeam (Carpinus betulus L.), poplar (Populus deltoides), chestnut (Castanea sativa Mill.) and Uludağ fir (Abies bornmülleriana Mattf.) were heat treated at 212°C for 1 hour and 2 hours by the ThermoWood® method. Colour and glossiness were determined and compared with untreated samples. Results showed that lightness (L*) decreased for all tested samples and that the decrease was higher with more intense treatments. Colour parameter a* (red/green) initially increased with heat treatment, then decreasing afterwards. The colour parameter b* (yellow/blue) on the other hand, decreased for Hornbeam and Chestnut and increased for Poplar and Uludag fir. Generally, the glossiness decreased with heat treatment for both measurements, along and across the grain. All factors and interactions were found to be significant (according to α = 0.05) with the exception of interaction (AB) for parallel (//) glossiness in 60°. The highest total colour change was achieved for Hornbeam (ΔE* = 41.58).

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Effect of heat treatment on the surface of selected exotic wood species

Ayata U., Gurleyen L., Esteves B.

Drewno : prace naukowe, doniesienia, komunikaty

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2017

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vol. 60, nr 199

105--116

EN

This study measured the effect of heat treatment according to the ThermoWood method on the colour and glossiness properties of selected exotic wood species. For this purpose, Afrormosia (Pericopsis elata), Doussie (Afzelia bipindensis), Frake (Terminalia superba) and Iroko (Chlorophora excelsa) were heat treated at 212°C for 1 hour and 2 hours using the ThermoWood method in Novawood Factory, Gerede, in Bolu, Turkey. After this process, the glossiness and colour of the untreated wood were tested in comparison with the heat-treated samples. The results show that the colour (L*, a* and b*) and glossiness (parallel and perpendicular to the grain at 20°, 60° and 85° angles) were changed by the treatment. Generally the L* and glossiness of the surface decreased and the ΔE* and a* increased with the intensity of the treatment.