Physical and Colorimetric Changes in Eucalyptus grandis Wood after Heat Treatment

Zanuncio, Antônio José Vinha; Motta, Javan Pereira; Silveira, Teodorico Alves da; Farias, Elias de Sá; Trugilho, Paulo Fernando

doi:10.15376/biores.9.1.293-302

Cited by 30 publications

(34 citation statements)

References 32 publications

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“…As thermal modification intensity increased, at 160 and 180 °C, the eucalypt samples tended to present a less reddish colour. This trend has also been observed in studies with Eucalyptus grandis by Zanuncio et al (2014), Cademartori et al (2013) and Moura and Brito (2011) for different thermal treatment process. The reduction of red colour tone in the thermally modified wood is associated with the volatilization of phenolic extractives that confer a red colour to the eucalypt wood (Pincelli et al 2012).…”

Section: Quantification Of Colour Of Untreated and Thermally Modifiedsupporting

confidence: 79%

“…Usually, fast-growing trees from forest plantations present wood of inferior quality in such attributes as colour, density and mechanical properties, which makes that it fetches a lower price in the timber market (Thulasidas et al 2006, Moya andBerrocal 2010). The surface colour and dimensional instability limit the use of the Eucalyptus grandis wood (Zanuncio et al 2014). During the thermal modification process, the wood becomes more dimensionally stable and the wood colour is changed and acquires a dark tonality, what could be advantageous for species with unappealing colour like eucalypt .…”

Section: Introductionmentioning

confidence: 99%

“…Extensively studies have shown the potential of thermal modification processes to enhance some of the less favourable wood properties, such as aesthetic characteristics, dimensional stability, and durability (Hill 2006, Cademartori et al 2013, Zanuncio et al 2014, Batista et al 2016. From earlier research studies, it is known that after thermal modification at high temperatures several wood species like beech, poplar, pine, spruce, birch, and the eucalypt become more dimensionally stable (Militz 2002, Hill 2006, Esteves et al 2007.…”

Section: Introductionmentioning

confidence: 99%

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Impact of thermal modification on color and chemical changes of spruce and oak wood

et al. 2018

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A study of colour assessment, using the CIEL*a*b* system, was conducted with samples of Eucalyptus grandis wood thermally treated by the Brazilian industrial process of thermal modification, VAP HolzSysteme®, at three different temperatures, i.e. 140, 160 and 180 °C. Previous to the treatment, the samples were classified into three groups according to their distance to the wood pith, on the radial direction. All thermally modified samples presented a noticeable colour change, confirmed by high values of ΔE*. As the intensity of the treatment increased, the eucalypt samples presented an increase of red colour tone (a*) (up to 160 ºC) and a decrease of colour lightness (L*). Significant colour differences were found among the classified groups, for both untreated and thermally modified samples. The eucalypt samples groups showed different colour responses when thermally treated at 140 and 160 ºC. At 180 ºC the groups didn't show a significant colour response variation.

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Section: Quantification Of Colour Of Untreated and Thermally Modifiedsupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of thermal modification on color and chemical changes of spruce and oak wood

et al. 2018

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“…For a given temperature, the quantity of each degradation product increases progressively as the treatment duration increases (Candelier et al 2013c). Zanuncio et al (2014), using eucalyptus treated between 140 and 230°C during 3 hours, found that mass loss varied from 0.33 % (140°C) to 0.63 % (170°C), to 2.73 % (200°C) and to 10.73 % (230°C). Olarescu et al (2014) studied the mass loss of lime wood (Tilia cordata Mill.)…”

Section: Introductionmentioning

confidence: 99%

Control of wood thermal treatment and its effects on decay resistance: a review

Candelier

Thévenon

Pétrissans

et al. 2016

Annals of Forest Science

190

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Key message An efficient use of thermal treatment of wood requires a depth understanding of the chemical modifications induced. This is a prerequisite to avoid problems of process control, and to provide high quality treated wood with accurately assessed properties to the market. Properties and structural anatomy of thermally modified woods are slightly different than un-processed woods from a same wood species. So it is necessary to create or adapt new analytical methods to control their quality. Context Heat treatment as a wood modification process is based on chemical degradation of wood polymer by heat transfer. It improves mainly the resistance of wood to decay and provides dimensional stability. These improvements, which come at the expense of a weakening of mechanical properties, have been extensively studied. Since a decade, researches focused mainly on the understanding of wood thermal degradation, on modelling, on quality prediction and quality control. Aims We aimed at reviewing the recent advances about (i) the analytical methods used to control thermal treatment; (ii) the effects on wood decay resistance and (iii) the advantages and drawbacks of a potential industrial use of wood heating. Methods We carried out a literature review of the main industrial methods used to evaluate the conferred wood properties, by thermal treatment. We used papers and reports published between 1970 and 2015, identified in the web of science data base.. Results Approximately 100 papers mostly published after 2000 were retrieved. They concentrated on: (i) wood mass loss due to thermal degradation determination, (ii) spectroscopic analyses of wood properties, (iii) colour measurements, (iv) chemical composition, (v) non-destructive mechanical assessments and (vi) use of industrial data. Conclusions One of most interesting property of heat-treated wood remains its decay resistance. Durability test with modified wood in laboratory are expensive and time-consuming. This review displays data from different analytical methods, such as spectroscopy, thermogravimetry, chemical analyses or mechanical tests that have the potential to be valuable indicators to assess the durability of heat treated wood at industrial scale. However, each method has its limits and drawbacks, such as the required investment for the equipment, reliability and accuracy of the results and ease of use at industrial scale.

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“…The highest value for the anisotropy in clone D indicates that its wood has restricted use in places with high humidity variation. However, treatments such as acetylation (Xie et al, 2013;Himmel et al, 2015) and heat treatment (Korkut, 2012;Zanuncio et al, 2014b) can reduce the variation in the wood dimensions and allow its use in such places.…”

Section: Characterization Of the Wood Physical Propertiesmentioning

confidence: 99%

ANATOMICAL, ULTRASTRUCTURAL, PHYSICAL AND MECHANICAL WOOD PROPERTIES OF TWO-YEAR-OLD Eucalyptus grandis × Eucalyptus urophylla CLONES

et al. 2018

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-Eucalyptus wood from adult trees is used for several purposes; however, the wood of younger trees has limited use. This study aims to characterize and propose uses of two-year-old eucalyptus wood. Six two-year-old Eucalyptus grandis × Eucalyptus urophylla clones have been selected and their anatomical, ultrastructural, physical and mechanical wood characteristics evaluated. The wood of Clone A shows more robust fibers with better microfibril arrangement, resulting in better mechanical properties, and therefore, a better performance for structural use. Clone F showed a low variation of wood basic density in the radial direction, facilitating its machinability, and with the Clone B, showed a lower anisotropy, and therefore, the wood is recommended for locations with high variations of humidity. The heterogeneity of the wood characteristics of the evaluated clones confirms the need for further studies, to choose those most adequate to each use.

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Physical and Colorimetric Changes in Eucalyptus grandis Wood after Heat Treatment

Cited by 30 publications

References 32 publications

Impact of thermal modification on color and chemical changes of spruce and oak wood

Impact of thermal modification on color and chemical changes of spruce and oak wood

Control of wood thermal treatment and its effects on decay resistance: a review

ANATOMICAL, ULTRASTRUCTURAL, PHYSICAL AND MECHANICAL WOOD PROPERTIES OF TWO-YEAR-OLD Eucalyptus grandis × Eucalyptus urophylla CLONES

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