Effect of thermal treatment on some properties of lime wood

Olarescu, M. C.; Câmpean, Mihaela; Ispas, Mihai; Coşereanu, Camelia

doi:10.1007/s00107-014-0809-5

Cited by 13 publications

(8 citation statements)

References 6 publications

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“…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.) treated at 180 and 200°C, combined with four treatment durations; 1, 2, 3 and 4 hours and showed that mass loss of heat treated wood increases according to temperature and treatment duration (Table 1).…”

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

185

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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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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

185

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“…This leads to changes in the amount of the components of the wood and also in its physical and chemical properties. After the heattreatment process, the dimensional stability and the durability of wood increase, which is strongly associated with the reduction in hygroscopicity (Bekhta and Niemz 2003;Cao et al 2012;Olarescu et al 2014). However, the loss of strength properties has always been one of the main drawbacks of thermal treatment, primarily impacting the strength, rigidity, and firmness of wood.…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Heat Treatment Temperatures on the Chemical Composition and Structure of Chinese Fir Wood

Cheng¹,

Huang²,

Wang³

et al. 2016

BioResources

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“…The application of thermal treatment in the wood industry has been growing in recent years. Studies have reported that heat process can modify some properties of wood as natural durability, dimensional stability, hygroscopicity (Olarescu et al 2014, Militz and Altgen 2016, Pertuzzatti et al 2016, Huang et al 2018 and mechanical properties (Kuzman et al 2015, Militz andAltgen 2016). Differences have also been verified in the equilibrium moisture content, volumetric swelling and chemical composition of juvenile and mature wood (Gonzáles-Peña et al 2009, Esteves et al 2011, Severo et al 2012.…”

Section: Introductionmentioning

confidence: 98%

Potential use of nir and visible spectroscopy to analyze chemical properties of thermally treated wood

Lengowski

Muñiz²,

Klock

et al. 2018

Maderas, Cienc. tecnol.

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The modification of wood by thermal treatments produces characteristic changes in its chemical composition and surface color and can improve the structural and esthetic quality. The objective of this paper is to evaluate the potential of near infrared and visible spectroscopy to predict the modifications in chemical composition of Eucalyptys grandis and Pinus taeda after thermal treatment. Near infrared and visible spectra were collected directly on the longitudinal surface of wood samples. The thermally modified wood of both species showed higher content of lignin and extractives than the untreated wood. There was darkening of thermally modified wood, as a result of chemical modification caused by heat. The Near infrared/visible technique identified the groups that were modified by treatment. NIR and visible spectroscopy can be used to predict chemical composition of natural or thermally treated Eucalyptus grandis and Pinus taeda.

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Effect of thermal treatment on some properties of lime wood

Cited by 13 publications

References 6 publications

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

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

Effect of Different Heat Treatment Temperatures on the Chemical Composition and Structure of Chinese Fir Wood

Potential use of nir and visible spectroscopy to analyze chemical properties of thermally treated wood

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