Effect of thermomechanical densification on surface roughness of wood veneers

Bekhta, Pavlo; Proszyk, S.; Krystofiak, T.; Mamoňová, Miroslava; Pinkowski, Grzegorz; Lis, B.

doi:10.1080/17480272.2014.923042

Cited by 41 publications

(26 citation statements)

References 13 publications

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“…When analysing the anatomical characteristics of densifi ed veneer, it was shown that wood morphology changed signifi cantly in the compression process. Earlier studies (Arruda and Del Menezzi, 2013;Bekhta et al, 2014) indicated that thermo-mechanical densifi cation improved surface quality of veneers with the surface becoming smoother, and roughness values decreasing signifi cantly. Roughness is closely related to wettability: the higher the roughness, the higher the surface hydrophilicity (Piao et al, 2010;Arnold, 2011).…”

Section: Rezultati I Raspravamentioning

confidence: 99%

“…In addition to the advantageous effect on properties such as strength, surface hardness and durability (Kutnar et al, 2008;Büyüksari et al, 2012;Büyüksari, 2013;Rautkari et al, 2013), surface quality of their aesthetic-decorative features could also be improved. The colour of wood becomes more attractive (Diouf et al, 2011), surface roughness decreases (Candan et al, 2010;Arruda and Del Menezzi, 2013;Bekhta et al, 2014), and the surface becomes glossier and smoother, while minimising the need for sanding. Despite the fact that thermal compression is an environmentally friendly process, after this treatment, the surface of the member becomes hydrophobic, which could result in serious problems during gluing or fi nishing.…”

Section: Introduction 1 Uvodmentioning

confidence: 99%

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Evaluation of Dynamic Contact Angle of Loose and Tight Sides of Thermally Compressed Birch Veneer

et al. 2018

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Rotary-cut veneer is characterised by two sides, namely loose and tight surface, which have different properties. The information concerning dynamic contact angle behaviour of veneer sides plays an important role in effi cient use of veneer. Therefore, the objective of this study was to investigate the infl uence of different compression temperatures and pressures on various wetting behaviour of loose and tight sides of birch veneer. Veneer sheets were compressed in a hot press at temperatures of 150 and 180 °C using seven pressure levels from 0.5 to 3.5 MPa. Wettability of loose and tight sides of thermally compressed veneer was evaluated by measuring the dynamic contact angle with distilled water. The results showed that thermal compression decreased the surface wettability of both loose and tight sides of the samples, especially for veneer samples compressed at a temperature of 180 °C. Tight side of the samples had lower wettability than loose side, even after thermal compression. Therefore, adhesive or any kind of fi nishing can be applied to both sides of thermally compressed veneer sheets without having any adverse infl uence on not only the bonding quality but also the whole fi nishing process.

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Section: Rezultati I Raspravamentioning

confidence: 99%

Section: Introduction 1 Uvodmentioning

confidence: 99%

Evaluation of Dynamic Contact Angle of Loose and Tight Sides of Thermally Compressed Birch Veneer

et al. 2018

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“…This raw material has become a part of everyday life without people realizing its immense significance and benefits. Wood is a renewable source of energy, and is used in various forms in everyday activities (Bekhtam et al 2014;Gaff et al 2016;Gottlöber et al 2016). Processing wood into a usable material is a very complex technological process that has a long history (Kminiak and Gaff 2015;Kubš et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Medium-density Fiberboard (MDF) and Edge-glued Panels (EGP) after Edge Milling - Surface Roughness after Machining with Different Parameters

Sedlecký¹,

Kvietková²,

Kminiak³

2018

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The mean arithmetic deviation of the roughness profile was investigated during cylindrical milling of the board edges. The machined materials were a medium-density fiberboard, medium-density fiberboard with single-sided lamination, and edge-glued spruce panel. Contactless and contact profilometers were used to measure the roughness. Both methods were evaluated and compared. Tungsten carbide blades with three different compositions and treatments were used. The effect of the cutting speed (20 m/s, 30 m/s, 40 m/s, and 60 m/s) and feed rate (4 m/min, 8 m/min, and 11 m/min) on the surface roughness was also monitored. The results of this study compared two different methods for determining the surface roughness. The measurements were more accurate with a contactless profilometer, but the price is higher than that of the contact method. The operation was also more complicated, and the measurement itself took longer with a contactless profilometer. The evaluation of individual surface quality variables was faster with a contact device. The best results in terms of the surface quality were achieved by lowering the feed rate and increasing the cutting speed.

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“…Neese et al (2004) conducted similar experiments and noticed the same dependence. Improving the quality of veneer surface can be done by conducting additional technological processes such as sanding or veneer densification (Candan et al 2010;Bekhta et al 2017), which allow obtaining better veneer properties, among others lower surface roughness (Diouf et al 2011;Bekhta et al 2014). However, in industrial process monitoring of the surface roughness during the peeling process and decreasing the roughness to the optimal level by appropriate selection of technological parameters can be necessary to obtain an acceptable surface quality.…”

Section: Introductionmentioning

confidence: 99%

“…Generally, methods of surface roughness measurement can be split into two categories: contact and non-contact. Methods from the first category are the most frequently used ones, and they are common in laboratory measurements, in particular for solid wood products (Kilic et al 2006;Thoma et al 2015), but also for wood veneers (Tanritanir et al 2006;Dundar et al 2008a;Candan et al 2010;Bekhta et al 2014). The main weakness of this approach is the contact between the fibers and the stylus, especially for fuzzy surfaces.…”

Section: Introductionmentioning

confidence: 99%

Study on the in-process measurements of the surface roughness of Douglas fir green veneers with the use of laser profilometer

et al. 2020

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The presented research concerns the use of a laser profilometer to measure the surface roughness of green Douglas fir heartwood veneers during the peeling process. It investigates the effect of various process parameters on the surface quality. Three experiments were carried out with a single variable factor for each experiment: log centration, soaking temperature and cutting speed. Moreover, the origin of the surface roughness of Douglas fir green veneers was investigated. The study shows that laser profilometer seems to be a useful equipment in online measurement of surface roughness of green veneers. Based on the experiment results it was stated that surface roughness of Douglas fir veneers is characterized by large differentiation depending on the location on the veneer. The performed analysis shows that the surface roughness of Douglas fir green veneer could be improved when using relatively high cutting speed, not too high steaming temperature and logs with a centered core. The presented study shows that the laser profilometer can be effectively applied to the measurement and evaluation of green veneers during the peeling process and that there is still an area to develop this methodology.

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Effect of thermomechanical densification on surface roughness of wood veneers

Cited by 41 publications

References 13 publications

Evaluation of Dynamic Contact Angle of Loose and Tight Sides of Thermally Compressed Birch Veneer

Evaluation of Dynamic Contact Angle of Loose and Tight Sides of Thermally Compressed Birch Veneer

Medium-density Fiberboard (MDF) and Edge-glued Panels (EGP) after Edge Milling - Surface Roughness after Machining with Different Parameters

Study on the in-process measurements of the surface roughness of Douglas fir green veneers with the use of laser profilometer

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