Effect of Thermo-Vibro-Mechanic® Densification Process on the Gloss and Hardness Values of Some Wood Materials

Şenol, Süleyman; Budakçı, Mehmet

doi:10.15376/biores.14.4.9611-9627

Cited by 15 publications

(7 citation statements)

References 30 publications

(42 reference statements)

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“…After mechanical densification, the density of wood can theoretically be increased to a value close to that of the cell wall, approximately 1500 kg/m 3 , and thereby achieve considerable improvements in strength properties (Báder et al 2018). Many previous studies have reported significant increases in the strength properties of mechanically densified wood (Dubey et al 2016;Kariz et al 2017;Pelit et al 2018;Şenol 2018;Song et al 2018;Gao et al 2019). Additionally, the biological resistance of the mechanically densified wood increases depending on the compression ratio (Pelit and Yalçın 2017).…”

Section: Introductionmentioning

confidence: 97%

Influence of densification on mechanical properties of thermally pretreated spruce and poplar wood

Pelit

Yorulmaz²

2019

BioRes

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The effects of mechanical densification on density, Brinell hardness, bending strength (MOR), modulus of elasticity (MOE), and compression strength (CS) of thermally pretreated spruce (Picea orientalis) and poplar (Populus nigra) wood samples were investigated. Thermal treatment was applied on the wood samples at four different temperatures (140 °C, 160 °C, 180 °C, and 200 °C) and two different durations (7 h and 9 h) under atmospheric pressure. Wood samples were then densified by compression at a temperature of 150 °C to two degrees (20% and 40%) of compression. The results indicated that the density, hardness, and MOR values of both compressed and non-compressed thermally pretreated spruce and poplar samples decreased with increasing treatment temperature and duration. At temperatures below 200 °C, the MOE was generally increased in thermally pretreated samples. However, the MOE was reduced in thermally pretreated samples at 200 °C compared to the untreated samples. Additionally, all thermal pretreatments increased CS values in compressed and non-compressed wood samples. The CS tended to decrease in thermally pretreated samples (especially 40% compressed) at 200 ºC. After the densification, all of the strength properties tested in thermally pretreated samples increased significantly depending on the increase in compression ratio.

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Section: Introductionmentioning

confidence: 97%

Influence of densification on mechanical properties of thermally pretreated spruce and poplar wood

Pelit

Yorulmaz²

2019

BioRes

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“…Deformations occur in cell wall of compressed wood material under normal atmospheric conditions. In densified wood materials; There are studies in the literature on density analysis and various mechanical properties (Ábrahám et al 2010, Ábrahám and Németh 2012, Arruda and Del Menezzi 2013, Fang et al 2012, Gong et al 2010, Hajihassani et al 2018, Kamke 2006, Kariz et al 2017, Laskowska 2017, Pelit and Sonmez 2015, Rautkari et al 2009, Senol et al 2017, Skyba et al 2009, Ulker et al 2012, Cruz et al 2018, Gao et al 2019, Laskowska 2020, Pertuzzatti et al 2018, determination of changes in surface hardness (Laine et al 2013, Laskowska 2017, Pelit et al 2015b, Rautkari et al 2009, Senol and Budakci 2019, Skyba et al 2009, Ulker et al 2012, microscopic analysis (Blomberg and Persson 2004, Rautkari et al 2010, wettability (Arruda andDel Menezzi 2013, Bekhta andKrystofiak 2016), determination of spring-back amounts (Kariz et al 2017, Pelit and Sonmez 2015, determination of surface properties by applying upper surface processes to surfaces obtained , Pelit et al 2015a, resistance to fungi and termites (Esteves et al 2017, Wehsener et al 2018, color or gloss changes (Ábrahám et al 2010, Cruz et al 2018, Lasko...…”

Section: Introductionmentioning

confidence: 99%

Determination of processing characteristics of wood materials densified by compressing

Tosun

Sofuoğlu

2023

Maderas, Cienc. tecnol.

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The main objective of this study is to determine optimum cutting parameters in order to specify the effect of densification by compressing on the processing properties of solid wood material and to achieve the best surface quality in materials densified at different rates. In line with this goal, the widely grown and low-density black poplar (Populus nigra) tree species were selected as the experimental material. Samples, which were compressed and densified by Thermo-Mechanical method at 0 %, 20 % and 40 % ratios, were processed at 1000 mm/min, 1500 mm/min and 2000 mm/min feed speeds and in 12000 rpm, 15000 rpm, 18000 rpm rotation speed on a computer numerical control machine by using two different cutters. Surface roughness values (Ra and Rz) were measured in order to evaluate surfaces obtained. Smoother surfaces were obtained in computer numerical control machining of densified samples. The lowest surface roughness values occurred in 40 % densified samples, which were the densest. The lowest surface roughness was obtained when 40 % densified samples were processed with cutter no.1 (two-flutes straight end mill), at 1000 mm/min feed speed and at 18000 rpm. Ra and Rz roughness values increased with the increase of the feed rate.

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“…As a result of densification, new wood products with high strength properties are developed, and thus low-density species are better utilized (Sandberg et al 2013;Song et al 2018;Fang et al 2019;Laskowska 2020;Sotayo et al 2020;Cabral et al 2022). Densification also improves the surface quality properties of wood such as roughness, contact angle, and gloss Diouf et al 2011;Arruda and Del Menezzi 2013;Büyüksarı 2013;Bekhta et al 2014aBekhta et al , 2017Şenol and Budakçı 2019). Densification is often achieved by compressing the wood in the transverse direction and under suitable heat and/or steam conditions (Seborg et al 1956;Inoue et al 1993a;Navi and Girardet 2000;Kamke and Sizemore 2008;Sandberg et al 2021;Cabral et al 2022).…”

Section: Introductionmentioning

confidence: 99%

Roughness, wettability, and morphological properties of impregnated and densified wood materials

Pelit

Arısüt

2022

BioRes

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The effects of pre-impregnation on surface roughness, wettability, and morphological structure of densified aspen and fir wood were investigated. Wood specimens were impregnated with paraffin, linseed oil, and styrene after pre-vacuum treatment. The impregnated specimens were densified using compression ratios of 20% and 40% at 120 °C, 150 °C, and 180 °C. The roughness decreased and the contact angle increased in all impregnated specimens (undensified and densified). Compared to paraffin and linseed oil-impregnated specimens, lower roughness and higher contact angle were found in styrene-impregnated specimens. After densification, the roughness and wettability of the wood specimens decreased. More successful results (lower roughness and higher contact angle) were generally obtained in specimens densified with high compression ratio (40%). In both untreated and impregnated specimens, the contact angle increased with increasing compression temperature. While the effect of compression temperature on the roughness of the fir specimens was not significant, the roughness of the aspen specimens (especially styrene-impregnated) decreased with the increase in temperature. Scanning electron microscopy observations indicated that impregnation agents (especially styrene) clung to wood cell walls and partially or completely filled the lumens. This was positively correlated with the determined roughness and wettability. Pre-impregnation facilitated wood densification without significant cell deformations.

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Effect of Thermo-Vibro-Mechanic® Densification Process on the Gloss and Hardness Values of Some Wood Materials

Cited by 15 publications

References 30 publications

Influence of densification on mechanical properties of thermally pretreated spruce and poplar wood

Influence of densification on mechanical properties of thermally pretreated spruce and poplar wood

Determination of processing characteristics of wood materials densified by compressing

Roughness, wettability, and morphological properties of impregnated and densified wood materials

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