scholarly journals Determination of Screw Withdrawal Resistance of Some Heat-Treated Wood Species

2017 ◽  
Vol 68 (1) ◽  
pp. 61-68 ◽  
Author(s):  
Osman Perçin ◽  
Şekip Şadiye Yasar ◽  
Mustafa Altunok ◽  
Oğuzhan Uzun
Keyword(s):  
Wood Species ◽  
Treated Wood ◽  
Heat Treated ◽  
Screw Withdrawal

scholarly journals Heat-Treated Wood as a Substrate for Coatings, Weathering of Heat-Treated Wood, and Coating Performance on Heat-Treated Wood

2019 ◽  
Vol 2019 ◽  
pp. 1-9 ◽  
Author(s):  
Vlatka Jirouš-Rajković ◽  
Josip Miklečić
Keyword(s):  
Heat Treatment ◽  
Wood Species ◽  
Treated Wood ◽  
Wood Properties ◽  
Treatment Method ◽  
Coating Performance ◽  
Treatment Processes ◽  
Treatment Conditions ◽  
Heat Treated ◽  
Trade Names

Heat treatment is a method of wood modification with increasing market acceptance in Europe. The major patented European commercial heat treatment processes have trade names ThermoWood, Platowood, Retiwood, Le Bois Perdure, and Oil-Heat-Treated Wood (OHT). To what extent modification of wood affects the resistance of wood to weathering is also an important aspect for wood applications, especially where appearance is important. Unfortunately, heat-treated wood has poor resistance to weathering, and surface treatment with coatings is required for both protection and aesthetic reasons. As a substrate for coating, heat-treated wood has altered characteristics such as lower hygroscopicity and liquid water uptake and changed acidity, wettability, surface free energy, and anatomical microstructure. Various wood species, heat treatment method, treatment intensity, and treatment conditions exhibited a different extent of changes in wood properties. These altered properties could affect coating performance on heat-treated wood. The reported changes in acidity and in surface energy due to heat treatments are inconsistent with one another depending on wood species and temperature of the treatments. This paper gives an overview of the research results with regards to properties of heat-treated wood that can affect coating performance and weathering of uncoated and coated heat-treated wood.

An evaluation of properties of four heat treated wood species

2014 ◽  
Vol 60 ◽  
pp. 60-65 ◽  
Author(s):  
Haci Ismail Kesik ◽  
Suleyman Korkut ◽  
Salim Hiziroglu ◽  
Hakan Sevik
Keyword(s):  
Wood Species ◽  
Treated Wood ◽  
Heat Treated

scholarly journals Coating Performance on Exterior Oil-Heat Treated Wood

Coatings ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 225 ◽  
Author(s):  
Mojgan Nejad ◽  
Mahdi Dadbin ◽  
Paul Cooper
Keyword(s):  
Moisture Content ◽  
Wood Species ◽  
Color Change ◽  
Treated Wood ◽  
Untreated Wood ◽  
Average Moisture Content ◽  
Southern Pine ◽  
Coating Performance ◽  
Spruce Wood ◽  
Heat Treated

Thermal modification and the degree of improved properties from the treatment depend on wood species and treatment parameters. Southern yellow pine and spruce are two wood species commonly used for decking, fences, and siding in North America. This study evaluated coating performance when applied on oil-heat-treated Southern pine and spruce wood samples. Moisture content, color, and gloss changes of samples were analyzed before weathering and then after each month for the first three months and then every six months during 18 months of natural weathering exposure in Toronto, Canada. The results showed that coated heat-treated woods had lower moisture uptake, lower color change, and overall better appearance ranking than coated-untreated wood samples. Coated-spruce wood samples had lower checking and splitting, and in general, much better performance than coated-Southern pine treated samples. Notably, the average moisture content of treated spruce wood samples was significantly lower than that of Southern pine, which explains lower checking and improved coatings’ appearance.

scholarly journals Artificial weathering of heat-treated pines from the Iberian peninsula

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 9642-9655
Author(s):  
Bruno M. Esteves ◽  
René Herrera ◽  
Jorge Santos ◽  
Luísa Carvalho ◽  
Lina Nunes ◽  
...  
Keyword(s):  
Treated Wood ◽  
Untreated Wood ◽  
Industrial Facilities ◽  
Artificial Weathering ◽  
Class D ◽  
Heat Treated ◽  
Pinus Pinaster Ait ◽  
In The Beginning ◽  
Weathering Process

Samples from the two most common pines grown in Portugal (Pinus pinaster Ait) and Spain (Pinus radiata, D. Don) were heat-treated in industrial facilities in accordance with ThermoWood ® class D. For both species, the variation in surface properties, of untreated and heat-treated wood after artificial weathering from 75 to 750 h, is presented. The analysis included the determination of color, roughness, gloss, and wettability before exposure and after each artificial weathering period. Untreated woods became darker faster, while in heat-treated woods, lightness remained approximately constant until 750 h of artificial weathering. Both untreated and heat-treated wood became more reddish in the beginning of the weathering process, turning greener for longer exposure times. Untreated woods became yellower in the beginning, turning into blueish tones later. Heat-treated wood turned slightly yellower until 750 h of weathering. Gloss decreased for untreated wood with no significant changes in heat-treated wood. Despite the changes, the gloss of both untreated and heat-treated wood converged to similar values. Roughness increased for both untreated and heat-treated woods. Artificial weathering increased the wettability of heat-treated wood.

Chemical Characterization and Comparison of Thermally Treated Beech and Ash Wood

2008 ◽  
Vol 599 ◽  
pp. 143-158 ◽  
Author(s):  
Elisabeth Windeisen ◽  
Gerd Wegener
Keyword(s):  
Cold Water ◽  
Treated Wood ◽  
Chemical Characterization ◽  
Exchange Chromatography ◽  
Hot Water ◽  
Thermal Treatments ◽  
Heat Treated ◽  
Temperature Load ◽  
Wet Chemical

Thermal treatments of two wood species were examined. The temperature load at 200 °C on the wood causes characteristic changes in the chemical composition. The determination of specific alterations was carried out by means of suitable methods, both wet chemical and instrumental analyses. The heat treated wood specimens of beech (Fagus sylvatica) and ash (Fraxinus excelsior) were characterized by means of Carbon analysis. The samples were extracted with organic solvents, cold and hot water. The pH-values were determined in the cold water extracts. Sugar analyses were performed after hydrolysis by means of ion-exchange chromatography. Lignin analyses after thioacidolysis were carried out by means of GC and GC/MS.

scholarly journals Determination of the Surface Roughness of Heat-Treated Wood Materials Planed by the Cutters of a Horizontal Milling Machine

BioResources ◽  
2013 ◽  
Vol 8 (3) ◽  
Author(s):  
Mehmet Budakçı ◽  
Abdullah Cemil İlçe ◽  
Tuğba Gürleyen ◽  
Mustafa Utar
Keyword(s):  
Surface Roughness ◽  
Treated Wood ◽  
Milling Machine ◽  
Heat Treated
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